在onReceive中取消注册Android广播接收器会抛出"Receiver not registered"

Question

我有BroadcastReceiver一次使用.

我在一个活动中注册它.我不能把它放进去unregisterReceiver(),onPause因为它必须保持运行,即使活动被暂停或销毁.

我希望BroadcastReceiver在完成后取消注册,如下所示:

public class SmsReceiver extends BroadcastReceiver {

    public void onReceive(Context context, Intent intent) {
           // do some code..
           context.unregisterReceiver(this)
        }
}

但它会导致异常: Receiver not registered.

Answer 1

甲BroadcastReceiver其执行过程中只存在onReceive()方法.因此,每次广播被发送/接收时,这将评估为丢弃实例.请参阅广播接收器生命周期.要动态注册/取消注册BroadcastReceivers,您必须记住接收器的实例,onPause()以便在其中再次注册onResume().

Answer 2

我知道这个问题已经有了答案但是试试这个代码

此代码适用于BatteryInfo.它确实有效.

private BroadcastReceiver mBatInfoReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context arg0, Intent intent) {
        // TODO Auto-generated method stub
        int level = intent.getIntExtra("level", 0);
        Log.i("Battery", String.valueOf(level) + "%");
        arg0.unregisterReceiver(mBatInfoReceiver);
    }

};

//Below code is the Code which attaches the reciever put this code in which ever place you want. 

this.registerReceiver(this.mBatInfoReceiver, new IntentFilter(
                Intent.ACTION_BATTERY_CHANGED));

附加StackOverFlow/Tutorial的参考