WhatsApp Notification bzw. neue Nachricht abfragen

public class MyAccessibilityService extends AccessibilityService {
	
	@Override
    public void onCreate() {
        super.onCreate();
    }
	
	private void sendToMain(String message) {
		
		Intent intent=new Intent("whatsapp.notifier.receiver");
		intent.putExtra("message",message);
		sendBroadcast(intent);

	}

	@Override
	public void onAccessibilityEvent(AccessibilityEvent event) {
		
		final int eventType = event.getEventType();
		
	    String eventText = "";
	    switch(eventType) {

	    	case AccessibilityEvent.TYPE_NOTIFICATION_STATE_CHANGED:
		    		StringBuilder sb = new StringBuilder();
		            for (CharSequence s : event.getText()) {
		                sb.append(s);
		            }
		            eventText = sb.toString();

		            String notificationText = "";
		            String infoTitle = "";
		            String infoText = "";
		            String infoText2 = "";
		            
		            Notification notification = (Notification) event.getParcelableData();
		            RemoteViews views = notification.contentView;
		            Class secretClass = views.getClass();

		            try {
		                Map<Integer, String> text = new HashMap<Integer, String>();

		                Field outerFields[] = secretClass.getDeclaredFields();
		                for (int i = 0; i < outerFields.length; i++) {
		                    if (!outerFields[i].getName().equals("mActions")) continue;

		                    outerFields[i].setAccessible(true);

		                    ArrayList<Object> actions = (ArrayList<Object>) outerFields[i].get(views);
		                    for (Object action : actions) {
		                        Field innerFields[] = action.getClass().getDeclaredFields();

		                        Object value = null;
		                        Integer type = null;
		                        Integer viewId = null;
		                        for (Field field : innerFields) {
		                            field.setAccessible(true);
		                            if (field.getName().equals("value")) {
		                                value = field.get(action);
		                            } else if (field.getName().equals("type")) {
		                                type = field.getInt(action);
		                            } else if (field.getName().equals("viewId")) {
		                                viewId = field.getInt(action);
		                            }
		                        }

		                        if (type == 9 || type == 10) {
		                            text.put(viewId, value.toString());
		                        }
		                    }
		                }
		                for (String value : text.values()) {
	                    	infoText = infoText + " " + value;
                    	}
		            } catch (Exception e) {
		                e.printStackTrace();
		            }

	    			eventText = infoText;

		    	    sendToMain(eventText);
		    	    
		    	    //CancelNotification(this, event.getCurrentItemIndex());
		    	    
	    		break;
	    }

	    
	    // Do something nifty with this text, like speak the composed string
	    // back to the user.
	}
	
	public static void CancelNotification(Context ctx, int notifyId) {
	    String ns = Context.NOTIFICATION_SERVICE;
	    NotificationManager nMgr = (NotificationManager) ctx.getSystemService(ns);
	    nMgr.cancel(notifyId);
	}
	


	@Override
	public void onInterrupt() {
		// TODO Auto-generated method stub
	}
	
	
	@Override
	public void onServiceConnected() {
		Log.d("TAS", "onServiceConnected");
		setServiceInfo();
	}
	

	private void setServiceInfo() {
        AccessibilityServiceInfo info = new AccessibilityServiceInfo();
        // We are interested in all types of accessibility events.
        info.eventTypes = AccessibilityEvent.TYPE_NOTIFICATION_STATE_CHANGED;
        // We want to provide specific type of feedback.
        info.feedbackType = AccessibilityServiceInfo.FEEDBACK_GENERIC;
        // We want to receive events in a certain interval.
        info.notificationTimeout = 100;
        // We want to receive accessibility events only from certain packages.

        // only handle this package
        //info.packageNames[0] = getPackageName();
        //info.packageNames = new String[] {"com.whatsapp", "com.android.email"};
        info.packageNames = new String[] {"com.whatsapp"};
        
        setServiceInfo(info);

	}
	    
	 
}

private class Receiver extends BroadcastReceiver {

    	 @Override
    	 public void onReceive(Context arg0, Intent arg1) {
    	    String message = arg1.getExtras().getString("message");

    	    addData("WhatsApp", message);
    	 }

    }

<service android:name=".MyAccessibilityService">
	     <intent-filter>
	         <action android:name="android.accessibilityservice.AccessibilityService" />
	     </intent-filter>
</service>