android :broadcast
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1.创建receiver
public class MyBroadcastReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { // TODO Auto-generated method stub String msg=intent.getExtras().get("msg").toString(); Toast.makeText(context,"intent.getAction()"+intent.getAction().toString(), Toast.LENGTH_LONG).show(); System.out.println("msg:"+msg); }
2.注册
2.1.静态注册broadcast
这种方法是在配置AndroidManifest.xml配置文件中注册,通过这种方式注册的广播为常驻型广播,也就是说如果应用程序关闭了,有相应事件触发程序还是会被系统自动调用运行。例如:
<!-- 在配置文件中注册BroadcastReceiver能够匹配的Intent --> <receiver android:name="com.example.test.MyBroadcastReceiver"> <intent-filter> <action android:name="android.intent.action.MyBroadcastReceiver"></action> <category android:name="android.intent.category.DEFAULT"></category> </intent-filter> </receiver>
2.2.动态注册
这种方法是通过代码在.Java文件中进行注册。通过这种方式注册的广播为非常驻型广播,即它会跟随Activity的生命周期,所以在Activity结束前我们需要调用unregisterReceiver(receiver)方法移除它。例如:
//通过代码的方式动态注册MyBroadcastReceiver MyBroadcastReceiver receiver=new MyBroadcastReceiver(); (这里可以写系统的广播接收者重写onReceiver方法就可以)IntentFilter filter=new IntentFilter(); filter.addAction(ACTION_NAME); //注册receiver registerReceiver(receiver, filter);
3.发送广播消息
Broadcast:
发送广播消息,把要发送的信息和用于过滤的信息(如Action、Category)装入一个Intent对象,然后通过调用 Context.sendBroadcast()、sendOrderBroadcast()或sendStickyBroadcast()方法,把 Intent对象以广播方式发送出去。
例如:
Intent intent = new Intent(ACTION_NAME);intent.putExtra("msg", "hello world");sendBroadcast(intent);//传递过去
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