Android-BroadcastReceiver使用笔记
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#以下为BroadcastReceiver使用笔记,如有不明白请留言。
注册静态广播
1)建立MyReceiver继承至BroadcastReceiver,并实现onReceived方法
@Override
public void onReceive(Context context, Intent intent) {
Toast.makeText(context,"Boot Completed",Toast.LENGTH_LONG).show();
}
public void onReceive(Context context, Intent intent) {
Toast.makeText(context,"Boot Completed",Toast.LENGTH_LONG).show();
}
2)AndroidManifest中添加注册信息
<receiver android:name=".MyReceiver">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED"/>
</intent-filter>
</receiver>
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED"/>
</intent-filter>
</receiver>
3)发送无序广播
Intent i = new Intent("android.intent.action.BOOT_COMPLETED");
sendBroadcast(i);
sendBroadcast(i);
#通过广播更新UI的方法:Activity写Receiver内部类,注册静态广播,并在onReceived方法中调用Handler更新信息
动态注册广播:
1)在Activity中建立Receiver的对象,添加过滤器
myReceiver = new MyReceiver();
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(MyReceiver.MYRECEIVER);
registerReceiver(myReceiver,intentFilter);
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(MyReceiver.MYRECEIVER);
registerReceiver(myReceiver,intentFilter);
2)在onDestroy()中取消注册
unregisterReceiver(myReceiver);
3)发送无序广播
Intent i = new Intent(MyReceiver.MYRECEIVER);
sendBroadcast(i);
sendBroadcast(i);
#动态注册不需要在AndroidManifest文件中添加相应的IntentFilter,否则sendBroadcast()时Receiver会接收到两条相同的信息
#有序广播为sendOrderedBroadcast();
#优先级:无序广播和有序广播都可以被优先级控制
<intent-filter android:priority="10">
#拦截广播:无序广播不可被拦截,否则会出异常
abortBroadcast();
发送本地广播(本地广播只能在应用中被接收,安全)
1)获取LocalBroadcastManager实例
localBroadcastManager = LocalBroadcastManager.getInstance(this);
2)动态注册广播
myReceiver = new MyReceiver();
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(MyReceiver.MYRECEIVER);
localBroadcastManager.registerReceiver(myReceiver,intentFilter);
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(MyReceiver.MYRECEIVER);
localBroadcastManager.registerReceiver(myReceiver,intentFilter);
3)发送广播
Intent i = new Intent(MyReceiver.MYRECEIVER);
localBroadcastManager.sendBroadcast(i);
localBroadcastManager.sendBroadcast(i);
4)onDestroy()取消注册
localBroadcastManager.unregisterReceiver(myReceiver);
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