Android BroadcastReceiver從未被稱爲

Question

大家好，感謝您的幫助！ 我會用代碼開始
所以，用廣播接收器類是這樣的：

public class MyService extends Service { 

    // ... 
    // ACTION 
    public static final String action = "com.mywebsite.myapp.package.class.action"; 
    // ... 
    public void onCreate() { 
     // SET BROADCAST RECEIVER 
     broadcastReceiver = new BroadcastReceiver() { 

      @Override 
      public void onReceive(Context context, Intent intent) { 
       String action = intent.getAction(); 
       Log.w("broadcast receiver", "action: " + action); 
       if (action.equals("**")) { 
        Log.w("broadcast receiver", "**"); 
       } 
      } 
     }; 
     // REGISTER BROADCAST 
     final IntentFilter myFilter = new IntentFilter(); 
     myFilter.addAction(action); 
     registerReceiver(this.broadcastReceiver, myFilter); 
    } 
    // .... 
} 

我嘗試以這種方式從一個片段

Intent myIntent = new Intent(getActivity() 
     .getApplicationContext(), MediaPlayerService.class); 
getActivity().startService(myIntent); 
myIntent = new Intent(getActivity().getApplicationContext(), 
     MediaPlayerService.class); 
myIntent.setAction(MyService.action); 
myIntent.putExtra("data", "*******"); 
getActivity().sendBroadcast(myIntent); 

然而，發送一個廣播廣播接收機從不被調用。我可以這樣說，因爲logcat：Log.w（「broadcast receiver」，「action：」+ action）;永遠不會被調用。我該如何解決？

謝謝！

編輯：類代碼：

public class MediaPlayerService extends Service { 

    private MediaPlayer mediaPlayer = null; 
    private AudioManager audioManager; 
    private BroadcastReceiver broadcastReceiver; 
    private String absoluteFilePath; 
    private Boolean areThereAnyErrors = false; 
    private int savedVolume; 
    // ACTIONS 
    public static final String prepareAndPlayNewFile = "com.disgustingapps.player.AudioManagement.MediaPlayerService.prepareAndPlayNewFile"; 

    @Override 
    public void onCreate() { 
     Log.w("MediaPlayerService", "onCreate called"); 
     // SET BROADCAST RECEIVER 
     broadcastReceiver = new BroadcastReceiver() { 

      @Override 
      public void onReceive(Context context, Intent intent) { 
       String action = intent.getAction(); 
       Log.w("broadcast receiver", "action: " + action); 
       if (action.equals("prepareAndPlayNewFile")) { 
        Log.w("broadcast receiver", "prepareAndPlayNewFile"); 
        prepareAndPlayNewFile(intent 
          .getStringExtra("absoluteFilePath")); 
       } 
      } 
     }; 
     // REGISTER BROADCAST 
     final IntentFilter myFilter = new IntentFilter(); 
     myFilter.addAction(prepareAndPlayNewFile); 
     registerReceiver(this.broadcastReceiver, myFilter); 
    } 

    @Override 
    public void onDestroy() { 
     Log.w("MediaPlayerService", "onDestroy called"); 
     unregisterReceiver(broadcastReceiver); 
    } 

    @Override 
    public int onStartCommand(Intent intent, int flags, int startId) { 
     Log.w("MediaPlayerService", "onStartCommand called"); 
     // We want this service to continue running until it is explicitly 
     // stopped, so return sticky. 
     return START_STICKY; 
    } 

    public void prepareAndPlayNewFile(String absoluteFilePath) { 
     // ...do something... 
    } 
} 

Answer 1

您沒有收到Intent的原因是因爲接收器在onCreate()。 context.startService()只會通過Activity的Intent到Service的onStartCommand()。 Service已經創建（或應該有），所以試圖在onCreate()接收將永遠不會工作。

更多信息here

試圖接收onStartCommand()只能使用一次（猜）。但如果您撥打startService()，在onStartCommand中輸入BroadcastReceiver只會爲您提供數據。既然你是這樣稱呼它的話，那麼只要把BroadcastReceiver丟掉，然後把Intent發送到Service的onStartCommand()就可以了。

編輯

@Override 
public void onCreate() { 
    Log.w("MediaPlayerService", "onCreate called"); 
} 

@Override 
public void onDestroy() { 
    Log.w("MediaPlayerService", "onDestroy called"); 
} 

@Override 
public int onStartCommand(Intent intent, int flags, int startId) { 
    Log.w("MediaPlayerService", "onStartCommand called");  

    String action = intent.getAction(); 
    Log.w("onStartCommand()", "action: " + action); 

    if (action.equals("prepareAndPlayNewFile")) { 
     prepareAndPlayNewFile(intent.getStringExtra("absoluteFilePath")); 
    } 

    // We want this service to continue running until it is explicitly 
    // stopped, so return sticky. 
    return START_STICKY; 
} 

然後只是這樣做：

​​

startService()：

這種方法每次調用會導致對目標服務的onStartCommand相應通話（Intent，int，int）方法，其意圖是h ERE。這提供了一種便捷的方式將作業提交給服務，而無需綁定並調用其接口。

Answer 2

在沒有看到代碼服務，以及如何開始它的很難說哪裏的問題..

首先，你要註冊的接收器服務的onCreate，但你沒有註銷事件..你應該把廣播接收器放在你的服務類的全局範圍內，並在onDestroy（）中取消註冊（重寫onDestroy並記錄消息以確認其停止）

第二，除非你綁定服務，然後服務將在啓動命令執行後立即「停止」。

您應該重寫onStartCommand並返回START_STICKY以保持服務正在運行。