手機進入空閒狀態時，後臺服務會停止

Question

我有一個必須始終運行的粘滯後臺服務。基本上它跟蹤時間，它是一個自定義時鐘計時器。但是一旦設備進入空閒狀態（當電話屏幕關閉時），定時器（後臺服務）也會暫停。

即使屏幕關閉，我應該怎麼做才能使它始終保持運行？

public class TimerService extends Service { 
    private Context context; 
    @Override 
     public IBinder onBind(Intent intent) { 
      Logger.LogI(TAG, "Service binding"); 
      return null; 
     } 

     @Override 
     public void onCreate() { 
      super.onCreate(); 
      context = getApplicationContext(); 
     } 

    @Override 
     public int onStartCommand(Intent intent, int flags, int startId) { 
     return Service.START_STICKY; 
     } 
    } 

Answer 1

所以當設備進入睡眠模式時，有一些服務不會被殺死。 我開始將我的服務作爲通知附帶的前臺服務。我不認爲它是長期服務的更好方法。但是，當然這個解決方案是爲了更多的優化而打開的。此解決方案在睡眠模式下不會使服務進入暫停狀態。

以下是整個服務代碼：

public class TimerService extends Service { 
    private ScheduledExecutorService scheduleTaskExecutor; 
    private Context context; 
    @Override 
    public IBinder onBind(Intent intent) { 
     Logger.LogI(TAG, "Service binding"); 
     return null; 
    } 

    @Override 
    public void onCreate() { 
     super.onCreate(); 
     context = getApplicationContext(); 
    } 

    @Override 
    public int onStartCommand(Intent intent, int flags, int startId) { 
     setNotification(); 
     if (scheduleTaskExecutor == null) { 
      scheduleTaskExecutor = Executors.newScheduledThreadPool(1); 
      scheduleTaskExecutor.scheduleAtFixedRate(new mainTask(), 0, 1, TimeUnit.SECONDS); 
     } 
     return Service.START_STICKY; 
    } 

    public void setNotification() { 
     PendingIntent contentIntent; 
     contentIntent = PendingIntent.getActivity(this, 0, 
      new Intent(this, Main_Activity.class), 0); 

     NotificationManager mNotificationManager = (NotificationManager) this.getSystemService(Context.NOTIFICATION_SERVICE); 
     NotificationCompat.Builder mBuilder = 
      new NotificationCompat.Builder(this) 
      .setSmallIcon(R.drawable.notification_icon) 
      .setColor(this.getResources().getColor(R.color.action_bar_color)) 
      .setContentTitle("MainActivity") 
      .setOngoing(true) 
      .setAutoCancel(false) 
      .setContentText("MyApp"); 
     mBuilder.setContentIntent(contentIntent); 
     mNotificationManager.notify(NOTIFICATION_ID, mBuilder.build()); 

     Notification notification = mBuilder.build(); 
     startForeground(NOTIFICATION_ID, notification); //NOTIFICATION_ID is a random integer value which has to be unique in an app 
    } 
} 
private class mainTask implements Runnable { 

    public void run() { 
     // 1 Second Timer 
    } 
} 

有用的鏈接：

Run a service in the background forever..? Android

How to run background service after every 5 sec not working in android 5.1?

How to run a method every X seconds

How to make service run even in sleep mode?

part-1 persistent foreGround android service that starts by UI, works at sleep mode too, also starts at phone restart

part-2 persistent foreGround android service that starts by UI, works at sleep mode too, also starts at phone restart

Android - implementing startForeground for a service?

Answer 2

如果你想使你的服務爲從未在onStartCommand

結束服務的話，用戶的代碼

@Override 
    public int onStartCommand(Intent intent, int flags, int startId) { 
    //Put code here 
    return START_REDELIVER_INTENT; 

} 

可以使用START_STICKY也。