Implement MediaSessionCompat.Callback for true android wear support

Author: MarshallOfSound

android/app/src/main/java/com/marshallofsound/gpmdp/remote/InternalMediaService.java

@@ -6,8 +6,6 @@
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
 import android.media.AudioManager;
-import android.os.Bundle;
-import android.os.ResultReceiver;
 import android.support.v4.app.NotificationManagerCompat;
 import android.support.v4.media.MediaMetadataCompat;
 import android.support.v4.media.session.MediaSessionCompat;
@@ -57,6 +55,35 @@ public void createNotification() {
 
         mediaSession = new MediaSessionCompat(mService, "GPMDP_MusicService");
 
+        sReactContext.runOnUiQueueThread(new Runnable() {
+            @Override
+            public void run() {
+                mediaSession.setCallback(new MediaSessionCompat.Callback() {
+                    @Override
+                    public void onPlay() {
+                        mService.sendCommand("playback", "playPause");
+                        super.onPlay();
+                    }
+
+                    @Override
+                    public void onPause() {
+                        mService.sendCommand("playback", "playPause");
+                        super.onPause();
+                    }
+
+                    @Override
+                    public void onSkipToNext() {
+                        super.onSkipToNext();
+                    }
+
+                    @Override
+                    public void onSkipToPrevious() {
+                        super.onSkipToPrevious();
+                    }
+                });
+            }
+        });
+
         mediaSession.setFlags(
                 MediaSessionCompat.FLAG_HANDLES_MEDIA_BUTTONS |
                         MediaSessionCompat.FLAG_HANDLES_TRANSPORT_CONTROLS);

android/app/src/main/java/com/marshallofsound/gpmdp/remote/PlaybackAPIService.java

@@ -47,8 +47,14 @@ public void emitEvent(String evName, String msg) {
         LocalBroadcastManager.getInstance(this).sendBroadcast(WebSocketMessage);
     }
 
-    private void sendCommand(String namespace, String method) {
-        ws.sendText("{\"namespace\": \"" + namespace + "\", \"method\": \"" + method + "\"}");
+    public void sendCommand(String namespace, String method) {
+        sendCommand(namespace, method, "[]");
+    }
+
+    public void sendCommand(String namespace, String method, String argArray) {
+        if (ws != null) {
+            ws.sendText("{\"namespace\": \"" + namespace + "\", \"method\": \"" + method + "\", \"arguments\": " + argArray + "}");
+        }
     }
 
     @Override