Android的消息机制是另一种形式的“事件处理”，这种机制是为了解决Android应用的多线程问题。--Android平台不允许Activity新启动的线程访问Activity里的界面组件，这样会导致新启动的线程无法修改界面组件的属性值，此时我们需要通过Hander的消息机制来实现了。
1.Handler简介
<wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">1) Handler作用：</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">在新启动的线程中发送消息</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">在主线程中获取，处理消息</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">2）控制消息的发送和接受的时机</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">通过回调的方法来实现，开发者需要重写Handler类中处理消息的方法，当新启动的线程发送消息</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">时，Handler类中处理消息的方法被自动回调。</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">3）Handler类包含如下方法用于发送、处理消息</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">. void handleMessage(Message msg)：处理消息的方法。该方法通常用于被重写</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">. final boolean hasMessages(int what):检查消息队列中是否包含what属性为指定值的消息</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">. final boolean hasMessages(int what,Object object) ：检查消息队列中是否包含what属性为指定值</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">的消息且object属性为指定对象的消息</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">. 多个重载的Message obtainMessage()：获取消息</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">. sendEmptyMessage(int what):发送空消息</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">. final boolean sendEmptyMessageDelayed(int what,long delayMills):指定多少秒后发送空消息</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">. final boolean sendMessage(Message msg)：立即发送消息</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">. final boolean sendMessageDelayed(Message msg,long delayMills)：指定多少秒后发送消息</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">2.使用心得：</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">1） 发送消息</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">新的启动线程，如：</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">new Timer().schedule(new Task(){</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">public void run(){</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">Message msg = new Message();</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">msg.what=0x1223;</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">myHandler.sendMessage(msg);</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">}</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">});</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">在上面中myHandler 是重写后的实例化对象：</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">final Handler myHandler = new Handler(){</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">public void handleMessage(Message msg){</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">if(msg.what = 0x1223){</span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">//确保此条消息是本程序发送</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">.......</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">}</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">}</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">};</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">当新的线程发送发送消息时，重写的handlerMessage(Message msg)就会被回调，从而达到了新线程来修改</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">Activity组件的属性效果。</span> </wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>
1.Handler简介
<wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">1) Handler作用：</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">在新启动的线程中发送消息</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">在主线程中获取，处理消息</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">2）控制消息的发送和接受的时机</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">通过回调的方法来实现，开发者需要重写Handler类中处理消息的方法，当新启动的线程发送消息</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">时，Handler类中处理消息的方法被自动回调。</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">3）Handler类包含如下方法用于发送、处理消息</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">. void handleMessage(Message msg)：处理消息的方法。该方法通常用于被重写</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">. final boolean hasMessages(int what):检查消息队列中是否包含what属性为指定值的消息</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">. final boolean hasMessages(int what,Object object) ：检查消息队列中是否包含what属性为指定值</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">的消息且object属性为指定对象的消息</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">. 多个重载的Message obtainMessage()：获取消息</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">. sendEmptyMessage(int what):发送空消息</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">. final boolean sendEmptyMessageDelayed(int what,long delayMills):指定多少秒后发送空消息</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">. final boolean sendMessage(Message msg)：立即发送消息</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">. final boolean sendMessageDelayed(Message msg,long delayMills)：指定多少秒后发送消息</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">2.使用心得：</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">1） 发送消息</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">新的启动线程，如：</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">new Timer().schedule(new Task(){</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">public void run(){</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">Message msg = new Message();</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">msg.what=0x1223;</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">myHandler.sendMessage(msg);</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">}</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">});</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">在上面中myHandler 是重写后的实例化对象：</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">final Handler myHandler = new Handler(){</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">public void handleMessage(Message msg){</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">if(msg.what = 0x1223){</span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">//确保此条消息是本程序发送</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">.......</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">}</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">}</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">};</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">当新的线程发送发送消息时，重写的handlerMessage(Message msg)就会被回调，从而达到了新线程来修改</span><br style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"></span><wbr style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px"><span style="color:rgb(70,70,70); font-family:simsun; font-size:14px; line-height:21px">Activity组件的属性效果。</span> </wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>
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