在 onResume() 中销毁 BroadcastReceiver

Question

我的 MainActivity 中有 onResume() 和 onDestroy() 方法。如何销毁 onResume() 方法中的 registerReceiver。我试图将它分配给变量但没有成功。

 @Override
 protected void onResume() {

   registerReceiver(new BroadcastReceiver() {

   @Override
   public void onReceive(Context context, Intent intent) {
    check_wifi_available();

   }
  }, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
  super.onResume();

 }

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

Answer 1

来自 android 文档：

If registering a receiver in your Activity.onResume() implementation, you should unregister it in Activity.onPause(). (You won't receive intents when paused, and this will cut down on unnecessary system overhead)

将您的接收器定义为 class 变量，如下所示：

private BroadcastReceiver mReceiver = new BroadcastReceiver() { 
 @Override 
 public void onReceive(Context context, Intent intent) {
     check_wifi_available(); 
   } 
 }

然后像这样实现 onPause() / onResume() 方法：

@Override 
protected void onResume() { 
     super.onResume(); 
     registerReceiver(mReciever, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
} 

@Override 
protected void onPause() { 
    super.onPause(); 
    unregisterReceiver(mReceiver);
 }

无需在 onDestroy() 方法中取消注册。

Answer 2

在您的 class' 属性中定义接收器：

private BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
     @Override
    public void onReceive(Context context, Intent intent) {

    }
};

和这些方法：

@Override
public void onResume() {
    super.onResume();
    registerReceiver(broadcastReceiver, new IntentFilter("your package name"));
}

@Override
protected void onPause() {
    super.onPause();
    unregisterReceiver(broadcastReceiver);
}

在 onResume() 中销毁 BroadcastReceiver

Destroy BroadcastReceiver in onResume()

android

broadcastreceiver