// get song track uri... public void getSongURI(String uri) { service.searchTracks( uri, new Callback<TracksPager>() { @Override public void success(TracksPager tracksPager, Response response) { song_path = tracksPager.tracks.items.get(0).uri; Log.e(LOG_TAG, "song uri: " + song_path); Intent intent = new Intent(Top10Songs.this, Player.class); intent.putExtra("track", song_path); startActivity(intent); } @Override public void failure(RetrofitError error) {} }); }