Code example for SurfaceHolder

	/* See: SurfaceHolder.Callback */ 
	public void surfaceCreated(SurfaceHolder holder) {
 
		Log.i("APP:", "Surface for native GL code created");
		mAppThread = new Thread(new AppRunnable());
		mSurface = holder.getSurface();
 
		/* Write a message on the new surface */ 
		Canvas canvas = holder.lockCanvas();
		Paint p = new Paint();
		p.setStyle(Paint.Style.FILL);
		p.setColor(Color.GREEN);
		p.setTextSize(40);
		p.setAntiAlias(true);
		canvas.drawText("V4L2-GFX needs a data stream, waiting", 75, 75, p);
		holder.unlockCanvasAndPost(canvas);
 
		/* 
		 * Note: we must start the GL render thread before launching a video with MediaPlayer. 
		 * This is because a tweaked version of libstagefrighthw.so knows how to  
		 * render to texture buffers when an application opens the V4L2-GFX driver first