How to start the NotificationListenerService on Android

Question

I would like to access notifications on a Android phone by using the NotificationListenerService. I checked lots of tutorials but I can't find where they call the service.

Should I use bindService or startService on MainActivity? How should the intents look like? Can someone show me the syntax of this?

Check out one of the service implementations I am studying:

public class NLService extends NotificationListenerService {

Context context;

@Override
public void onCreate() {

    super.onCreate();
    context = getApplicationContext();


}


@Override
public void onNotificationPosted(StatusBarNotification sbn) {
    String pack = sbn.getPackageName();
    String ticker ="";
    if(sbn.getNotification().tickerText !=null) {
        ticker = sbn.getNotification().tickerText.toString();
    }
    Bundle extras = sbn.getNotification().extras;
    String title = extras.getString("android.title");
    String text = extras.getCharSequence("android.text").toString();
    int id1 = extras.getInt(Notification.EXTRA_SMALL_ICON);
    Bitmap id = sbn.getNotification().largeIcon;


    Log.i("Package",pack);
    Log.i("Ticker",ticker);
    Log.i("Title",title);
    Log.i("Text",text);

    Intent msgrcv = new Intent("Msg");
    msgrcv.putExtra("package", pack);
    msgrcv.putExtra("ticker", ticker);
    msgrcv.putExtra("title", title);
    msgrcv.putExtra("text", text);
    if(id != null) {
        ByteArrayOutputStream stream = new ByteArrayOutputStream();
        //id.compress(Bitmap.CompressFormat.PNG, 100, stream);
        byte[] byteArray = stream.toByteArray();
        msgrcv.putExtra("icon",byteArray);
    }
    LocalBroadcastManager.getInstance(context).sendBroadcast(msgrcv);

}
@Override

public void onNotificationRemoved(StatusBarNotification sbn) {
    Log.i("Msg","Notification Removed");

}

}

Predicant

In which case you have to get notification from android system? – Cageling

Answer 1

For listening incoming notifications, their is no need to start it explicitly . First define your service in manifest with the following permission -

android.permission.BIND_NOTIFICATION_LISTENER_SERVICE

 <service android:name=".MyNotificationListener"
      android:permission="android.permission.BIND_NOTIFICATION_LISTENER_SERVICE">
     <intent-filter>
         <action android:name="android.service.notification.NotificationListenerService" />
     </intent-filter>
 </service>

Another thing to take care is that you must grant the permission either by using the following intent -

Intent intent=new Intent("android.settings.ACTION_NOTIFICATION_LISTENER_SETTINGS");

or by granting the notification access manually.

Morey

To Which method should I pass this intent? – Predicant

The above mentioned intent is use to open the notification settings. It will list all the apps asking for notification access. Before using notification listener service, you must grant notification access to your app – Morey

Ok. I have previously given app permission to access notifications. But still, the service does not start... – Predicant

The word "firing" doesn't mean anything. Should be startActivity using the intent. – Miscellanea

On Android 12, I have call startService. But there's no reponse in onNotificationPosted. idk why – Pleuropneumonia