SurfaceView Test 3 #16

class TestSurfaceView extends SurfaceView implements SurfaceHolder.Callback{

    private DrawThread drawThread;

    public TestSurfaceView(Context context) {
        super(context);
        getHolder().addCallback(this);
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        drawThread = new DrawThread(getContext(), getHolder());
        drawThread.start();
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        drawThread.requestStop();
        boolean retry =  true;
        while(retry){
            try{
                drawThread.join();
                retry = false;
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }

    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        drawThread.set(event.getX(), event.getY(), 0);
        return super.onTouchEvent(event);
    }
}

class DrawThread extends Thread{

    private SurfaceHolder surfaceHolder;
    float x = -100000, y = -100000, radius = 0;
    private volatile boolean running = true;

    public void set(float x, float y, float radius){
        this.x = x;
        this.y = y;
        this.radius = radius;
    }

    public DrawThread(Context context, SurfaceHolder surfaceHolder){
        this.surfaceHolder = surfaceHolder;
    }

    public void requestStop() {
        running = false;
    }



    @Override
    public void run() {
        Paint paint = new Paint();
        paint.setColor(Color.YELLOW);
        while (running){
            Canvas canvas = surfaceHolder.lockCanvas();
            if(canvas != null){
                try {
                    canvas.drawColor(Color.BLUE);
                    canvas.drawCircle(x,y,radius,paint);
                }
                finally {
                    surfaceHolder.unlockCanvasAndPost(canvas);
                }
            }
            radius += 5;
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}