关闭应用程序后，保持广播接收器运行

Question

应用启动后，我需要一直保持广播接收器始终运行。这是在应用程序中注册此接收器的代码    IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);    filter.addAction(Intent.ACTION_SCREEN_OFF);    BroadcastReceiver mReceiver = new ScreenEventsReceiver();    registerReceiver(mReceiver, filter);和接收器代码public class ScreenEventsReceiver extends BroadcastReceiver {     public static boolean wasScreenOn = true;     @Override     public void onReceive(Context context, Intent intent) {        if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {            wasScreenOn = false;            Log.d("ScreenEventReceiver", "ON");        } else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {            wasScreenOn = true;            Log.d("ScreenEventReceiver", "ON");        }     }}

Answer 1

您可以使用服务

在主应用中启动/停止服务

Intent service = new Intent(context, MyService.class);

context.startService(service);

...

Intent service = new Intent(context, MyService.class);

context.stopService(service);

服务

public class MyService extends Service

{

 private static BroadcastReceiver m_ScreenOffReceiver;

 @Override

 public IBinder onBind(Intent arg0)

 {

  return null;

 }

 @Override

 public void onCreate()

 {

  registerScreenOffReceiver();

 }

 @Override

 public void onDestroy()

 {

  unregisterReceiver(m_ScreenOffReceiver);

  m_ScreenOffReceiver = null;

 }

 private void registerScreenOffReceiver()

 {

  m_ScreenOffReceiver = new BroadcastReceiver()

  {

   @Override

   public void onReceive(Context context, Intent intent)

   {

     Log.d(TAG, "ACTION_SCREEN_OFF");

     // do something, e.g. send Intent to main app

   }

  };

  IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_OFF);

  registerReceiver(m_ScreenOffReceiver, filter);

 }

}