如何僅在Android中的APP背景中激活Broadcast Receiver？

Question

我在我的應用程序中使用廣播接收器，它在應用程序打開時處於活動狀態以及應用程序處於關閉狀態。我需要的只是在應用程序打開時以及在特定活動時激活此廣播接收器。

這裏是我的

public class Receiver extends BroadcastReceiver { 
@Override 
public void onReceive(Context context, Intent intent) { 
    // Check if the application is install or uninstall and display the message accordingly 
    if (intent.getAction().equals("android.intent.action.PACKAGE_ADDED")) { 
     // Application Install 
     Log.e("Package Added:-", intent.getData().toString()); 

    } else if (intent.getAction().equals("android.intent.action.PACKAGE_REMOVED")) { 

     Log.e("Package Removed:-", intent.getData().toString()); 
    } else if (intent.getAction().equals("android.intent.action.PACKAGE_REPLACED")) { 
     Log.e("Package Replaced:-", intent.getData().toString()); 
    } 


} 

Answer 1

例如：

@Override 
protected void onPause() { 

    // Unregister since the activity is not visible 
    LocalBroadcastManager.getInstance(this).unregisterReceiver(mReceiver); 
    super.onPause(); 
} 

@Override 
protected void onResume() { 
    super.onResume(); 

    // Register mMessageReceiver to receive messages. 
    LocalBroadcastManager.getInstance(this).registerReceiver(mReceiver, 
                  new IntentFilter(
                    YourBroadcastReceiver.class 
                      .getSimpleName())); 
}