Android從服務類別到擴展服務類別的意圖

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我有意向傳遞到數據服務類如下活動類

活動課

public class UsherActivity extends ListActivity { 
    ... 

    public void createNotification() { 

     int subtotal = 580; 


     Intent serviceIntent = new Intent(this, SampleOverlayService.class); 
     serviceIntent.putExtra("box", "8"); 
     serviceIntent.putExtra("tot", subtotal); 
     startService(serviceIntent); 

    } 
}

我SampleOverlayService類如下：注意「subtotal_from_intent_putExtra_Here」 ...這是我想要顯示的數據。

import android.app.Notification; 
import android.app.PendingIntent; 

import android.content.Intent; 

public class SampleOverlayService extends OverlayService { 

    public static SampleOverlayService instance; 

    private SampleOverlayView overlayView; 

    @Override 
    public void onCreate() { 
     super.onCreate(); 

     instance = this; 

     overlayView = new SampleOverlayView(this); 
    } 

    @Override 
    public void onDestroy() { 
     super.onDestroy(); 

     if (overlayView != null) { 
      overlayView.destory(); 
     } 

    } 

    static public void stop() { 
     if (instance != null) { 
      instance.stopSelf(); 
     } 
    } 

    @Override 
    protected Notification foregroundNotification(int notificationId) { 
     Notification notification; 

     notification = new Notification(R.drawable.ic_launcher, "getString(R.string.title_notification), System.currentTimeMillis()); 

     notification.flags = notification.flags | Notification.FLAG_ONGOING_EVENT | Notification.FLAG_ONLY_ALERT_ONCE; 

     notification.setLatestEventInfo(this, "subtotal_from_intent_putExtra_Here", getString(R.string.message_notification), notificationIntent()); 

     return notification; 
    } 


    private PendingIntent notificationIntent() { 
     Intent intent = new Intent(this, SampleOverlayHideActivity.class); 

     PendingIntent pending = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT); 

     return pending; 
    } 

}

而且OverlayService類是如下

import android.app.Notification; 
import android.app.NotificationManager; 
import android.app.Service; 
import android.content.Intent; 
import android.os.IBinder; 

public class OverlayService extends Service { 

    protected boolean foreground = false; 
    protected boolean cancelNotification = false; 
    protected int id = 0; 

    protected Notification foregroundNotification(int notificationId) { 
     return null; 
    } 

    public void moveToForeground(int id, boolean cancelNotification) { 
     moveToForeground(id, foregroundNotification(id), cancelNotification); 
    } 

    public void moveToForeground(int id, Notification notification, boolean cancelNotification) { 
     if (! this.foreground && notification != null) { 
      this.foreground = true; 
      this.id = id; 
      this.cancelNotification = cancelNotification; 

      super.startForeground(id, notification); 
     } else if (this.id != id && id > 0 && notification != null) { 
      this.id = id; 
      ((NotificationManager) getSystemService(NOTIFICATION_SERVICE)).notify(id, notification); 
     } 
    } 


    public void moveToBackground(int id, boolean cancelNotification) { 
     foreground = false; 
     id = 0; 
     super.stopForeground(cancelNotification); 
    } 

    public void moveToBackground(int id) { 
     moveToBackground(id, cancelNotification); 
    } 

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

    @Override 
    public IBinder onBind(Intent intent) { 
     return null; 
    } 

}

我誠實地嘗試不同的方法都無濟於事。我只是得到java.lang.nullPointerException，因爲intent.getExtras（）返回null，無論我把它放在哪裏。如何獲得通知的小計？

在此先感謝。

編輯：我從https://gist.github.com/bjoernQ/6975256

來源

2016-08-12 brian okeefe

你在哪裏打電話intent.getExtras（）？ – fluffyBatman

重寫函數onStartCommand，那你可以得到意圖 – has19

@has 19是的，我得到它被傳遞到OverlayService類的onStartCommand ...但我怎樣在SampleOverlayService類中調用它並將它分配給String？ –

覆蓋onStartCommand(Intent intent,, int flags, int startId)。

代碼：

public class SampleOverlayService extends OverlayService { 

private int totalCount = 0; 

    @Override 
    public int onStartCommand(Intent intent, int flags, int startId) { 
     totalCount = intent.getIntExtra("tot", 0); 
     return super.onStartCommand(intent, flags, startId); 
    } 

}

在totalCount變量此將獲得價值，你可以相應地使用這個值。

來源

2016-08-17 09:47:48 Kushal

我明白了一天之前的情況，但你是對的......我的方式和你一樣，謝謝你的詳細說明......並且你會得到答案......歡呼聲。 –

意圖立足於SampleOverlayService被傳遞到 'onStartCommand' 的方法

來源

2016-08-12 20:23:55

是的，我得到它正在傳遞給onStartCommand of the OverlayService類...但我如何在SampleOverlayService類中調用它並將其分配給字符串？ –

Android從服務類別到擴展服務類別的意圖

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