Get Spotify Stream Volume | Android (Kotlin)

I'm trying to get the volume value of the Spotify Music Stream. I am able to get it throw STREAM_MUSIC when Spotify is playing music from the Android device or while the Android device is connected to a bluetooth speaker.

But when I'm streaming from the Android device to my Spotify App on the Smart TV/TV Streamer, Android is creating a new volume stream called: "Spotify" (as in the picture) How can I get this value?

Picture of Volume Streams on my Android device

Please help me understand how can I get the volume of this stream.. Thanks!

Actually, it is so difficult.

First, you have to use MediaSessionManager.getActiveSessions https://developer.android.com/reference/android/media/session/MediaSessionManager#getActiveSessions(android.content.ComponentName)

But it needs NotificationListenerService. Please refer to https://developer.android.com/reference/android/service/notification/NotificationListenerService https://github.com/codechacha/NotificationListener

MyNotificationService.java

public class MyNotificationService extends NotificationListenerService {
    @Override
    public void onNotificationRemoved(StatusBarNotification sbn) {
        super.onNotificationRemoved(sbn);
    }

    @Override
    public void onNotificationPosted(StatusBarNotification sbn) {
        super.onNotificationPosted(sbn);
    }
}

AndroidManifest.xml

    <service
        android:name=".MyNotificationService"
        android:permission="android.permission.BIND_NOTIFICATION_LISTENER_SERVICE">
        <intent-filter>
            <action android:name="android.service.notification.NotificationListenerService" />
        </intent-filter>
        <meta-data
            android:name="android.service.notification.default_filter_types"
            android:value="1,2">
        </meta-data>
    </service>

Request permission

if (!permissionGrantred()) {
    Intent intent = new Intent(
            "android.settings.ACTION_NOTIFICATION_LISTENER_SETTINGS");
    startActivity(intent);
}


private boolean permissionGrantred() {
    Set<String> sets = NotificationManagerCompat.getEnabledListenerPackages(this);
    if (sets != null && sets.contains(getPackageName())) {
        return true;
    } else {
        return false;
    }
}

Main code

MediaSessionManager msm = (MediaSessionManager)getSystemService(Context.MEDIA_SESSION_SERVICE);
ComponentName cn = new ComponentName(this, MyNotificationService.class);
List<MediaController> list = msm.getActiveSessions(cn);
for (MediaController mc : list) {
    if (mc.getPackageName().equals("com.spotify.music")) {
        int spotifyVolume = mc.getPlaybackInfo().getCurrentVolume();
    }
}

or you can get it with callback

for (MediaController mc : list) {
    if (mc.getPackageName().equals("com.spotify.music")) {
        mc.registerCallback(new MediaController.Callback() {
            @Override
            public void onAudioInfoChanged(MediaController.PlaybackInfo info) {
                int spotifyVolume = info.getCurrentVolume();
            }
        });
    }
}