android studio BroadcastReceiver基础

最新推荐文章于 2024-12-10 19:43:13 发布

原创最新推荐文章于 2024-12-10 19:43:13 发布 · 1k 阅读

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CC 4.0 BY-SA版权

本文详细介绍了Android中广播接收器的使用方法，包括如何在Activity中控制广播接收器的注册与注销，通过发送显式与隐式的广播Intent，并展示了如何在广播接收器中处理接收到的广播。

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最简单形式：

manifest：

<receiver
    android:name=".MyReceiver"
    android:enabled="true"
    android:exported="false"></receiver>

mainactivity：

case R.id.btn:
    sendBroadcast(new Intent(this,MyReceiver.class));
    break;

myreceiver:

 @Override
    public void onReceive(Context context, Intent intent) {
        // TODO: This method is called when the BroadcastReceiver is receiving
        // an Intent broadcast.
//        throw new UnsupportedOperationException("Not yet implemented");
        System.out.println("receive new msg");
    }

在activity中控制receiver的创建和销毁：

首先在manifest中注释掉receiver。

在receiver中定义：

public static final String ACTION="com.example.jowang.learnbroadcastreceiver.intent.action.MyReceiver";

mainactivity:

@Override
public void onClick(View view) {
    switch (view.getId()){
        case R.id.btn:
            sendBroadcast(new Intent(MyReceiver.ACTION));//隐式intent
            break;
        case R.id.btnreg:
            if (receiver==null){
                receiver=new MyReceiver();
                registerReceiver(receiver,new IntentFilter(MyReceiver.ACTION));
            }
            break;
        case R.id.btncan:
            if (receiver!=null){

                unregisterReceiver(receiver);
                receiver=null;
            }
            break;
    }
}
private MyReceiver receiver=null;
优先级 在intentfilter中设置priority数值越大，优先级越高

阻止信息继续传递：activity中：sendorderedbroadcast(intent,null)

receiver的onreceive中：abortbroadcast();