Android通過本地服務向活動發送數據

Question

我有一個接收gcm推送通知的應用程序。我也有一個檢查，如果應用程序當前打開，它不會創建通知。在Android中，我的推送服務可以告訴當前活動（如果可用/已連接），新通知已到達，請使用新內容刷新您的列表？如果這是可能的，我相信我在我的服務上使用IBinders是正確的道路。關於這一點的事情是我對服務如何調用活動感到困惑（我理解爲反之）。如果有人能提供幫助，請提前致謝！

只是要清楚。我正試圖告訴活動有關新推送消息。

服務

public class LocalBinder extends Binder { 
    GcmIntentService getService() { 
     return GcmIntentService.this; 
    } 
} 
@Override 
public IBinder onBind(Intent intent) { 
    return mBinder; 
} 
private final IBinder mBinder = new LocalBinder(); 

客戶端（活動）

private ServiceConnection mConnection = new ServiceConnection() { 
    public void onServiceConnected(ComponentName className, IBinder service) { 
     // This is called when the connection with the service has been 
     // established, giving us the service object we can use to 
     // interact with the service. Because we have bound to a explicit 
     // service that we know is running in our own process, we can 
     // cast its IBinder to a concrete class and directly access it. 
     mBoundService = ((GcmIntentService.LocalBinder)service).getService(); 

     // Tell the user about this for our demo. 
     Toast.makeText(MainActivity.this, "Connected", Toast.LENGTH_SHORT).show(); 
    } 

    public void onServiceDisconnected(ComponentName className) { 
     // This is called when the connection with the service has been 
     // unexpectedly disconnected -- that is, its process crashed. 
     // Because it is running in our same process, we should never 
     // see this happen. 
     mBoundService = null; 
     Toast.makeText(MainActivity.this, "Disconnected", 
       Toast.LENGTH_SHORT).show(); 
    } 
}; 
void doBindService() { 
    // Establish a connection with the service. We use an explicit 
    // class name because we want a specific service implementation that 
    // we know will be running in our own process (and thus won't be 
    // supporting component replacement by other applications). 
    bindService(new Intent(MainActivity.this, 
      GcmIntentService.class), mConnection, Context.BIND_AUTO_CREATE); 
    mIsBound = true; 
} 

void doUnbindService() { 
    if (mIsBound) { 
     // Detach our existing connection. 
     unbindService(mConnection); 
     mIsBound = false; 
    } 
} 

@Override 
protected void onDestroy() { 
    super.onDestroy(); 
    doUnbindService(); 
} 

Answer 1

是的，它是可能的。

在服務類具有類型YourActivity

MyActivity myActivity = null; 

在你onServiceConnected方法設置在服務此myActivity變量，通過該粘合劑獲得的變量。

mBoundService.myActivity = MyActivity.this; // or something similar 

現在你的服務有一個指向你的活動的指針！是啊！

在你的活動中，創建一個函數，這個函數的主體應該用數據刷新UI。

最後，當服務檢測新的數據，請致電：

if (myActivity) 
    myActivity.refreshMyData(); 

解除綁定時，記得設置myActivity變量設置爲null，否則前面的代碼將失敗。