rhyme_op_lph的博客

private void switchFragment(Fragment from, Fragment to) {         if (from == null && to == null){            return;        }        FragmentTransaction fragmentTransaction= fragManager.beg

Handler防止内存泄漏:1.声明弱引用:static classmyHandler extends Handler {    WeakReferencemActivityReference;     myHandler(Activity activity) {        mActivityReference= newWeakReference(activity);

1.HttpURLConnection介绍(引自百度)URLconnection是个抽象类,它有两个直接子类分别为HttpURLConnection和JarURLConnection,另外一个重要的类是URL,通常URL可以通过传给构造器一个String类型的参数来生成一个指定特定地址的URL实例,每个HttpURLConnection实例都可以生成单个请求,但是其他实例可以透明的共享连接到H