Android学习笔记之Broadcast机制

最新推荐文章于 2025-11-03 21:03:51 发布

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本文详细介绍了在Android中如何使用BroadcastReceiver进行消息接收，包括静态注册和动态注册的方法，并探讨了Broadcast生命周期的问题，指出其不适合执行耗时任务。

静态注册

继承BroadcastReceiver父类，重写onReceive方法。
在AndroidManifest.xml中静态注册

public class BatteryLowReceiver extends BroadcastReceiver{
    private String TAG = "BatteryLowReceiver";
    @Override
    public void onReceive(Context context, Intent intent){
        Log.d(TAG,"action = " + intent);
    }
}

<receiver android:name=".BatteryLowReceivr">
    <intent-filter>
        <action android:name"android.intent.action.BATTERT_LOW"/>
    </intent-filter>
</receiver>

动态注册

private BroadcastReceiver mBatteryReceiver = new BroadcastReceiver(){
    @Override
    public void onReceive(Context context,Intent intent){
        Log.d(TAG,"action = " + intent.getAction());
    }
}

@Override
protected void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    registerReceiver();
}

@Override
protected void onDestroy(){
    super.onDestroy();
    unregisterReceiver(mBatteryReceiver);
}

void registerReceiver(){
    mFilter = new IntentFilter();
    mFilter.addAction(Intent.ACTION_BATTERY_CHANGED);
    registerReceiver(mBatteryReceiver, mFilter);
}