Replace this:
String uriPath = "android.resource://"+ getPackageName() + "/assets/xyz/"+"age.mp4";
with this:
AssetFileDescriptor afd = getAssets().openFd("xyz/age.mp4"); player.setDataSource(afd.getFileDescriptor(),afd.getStartOffset(),afd.getLength());
and make sure you get ID of video view from layout like:
VideoView videoView =(VideoView)findViewById(R.id.videoView1);
Create MediaController like:
MediaController mediaController= new MediaController(this);
mediaController.setAnchorView(videoView);
Set MediaController like:
videoView.setMediaController(mediaController);