Java 关闭应用程序后，保持广播接收器运行

Z时代
2024-01-10
分类：问答

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");
        }
     }
}

回答：

你可以使用服务

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);
 }
}