How to draw on Canvas in another thread?
<p>I have been developing the application, and I need that drawingg is executed in another thread. Now my code is: </p>

<pre><code>public class PainterView extends View implements DrawingListener {

    //private GestureDetector detector;
    private Context context;
    private Painter painter;
    private Bitmap background;
    private Bitmap bitmap;
    private Paint bitmapPaint;
    private Path path;
    private Paint paint;

    private float x;
    private float y;

    private boolean isErasing=false;
    private boolean isTextDrawing=false;

    private ExecutorService pool;

    public PainterView(Context context, Painter painter) {

        super(context);
        this.context = context;
        this.painter = painter;
        pool=Executors.newFixedThreadPool(3);
        //detector = new GestureDetector(context, new GestureListener());
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
    }

    @Override
    protected void onDraw(final Canvas canvas) {
        if (bitmap != null) {
            pool.submit(new Runnable() {

                @Override
                public void run() {
                    // TODO Auto-generated method stub
                    synchronized (PainterView.this) {
                        canvas.drawBitmap(background, 0, 0, bitmapPaint);
                        canvas.drawBitmap(bitmap, 0, 0, bitmapPaint);
                        canvas.drawPath(path, paint);
                    }
                }

            });

        }
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        //detector.onTouchEvent(event);
        x = event.getX();
        y = event.getY();
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                painter.touchStart(x, y);
                break;
            case MotionEvent.ACTION_MOVE:
                painter.touchMove(x, y);
                break;
            case MotionEvent.ACTION_UP:
                painter.touchUp();
                break;
        }
        return true;
    }

    @Override
    public void onPictureUpdate(Bitmap background, Bitmap bitmap, Paint bitmapPaint, Path path, Paint paint) {
        this.background=background;
        this.bitmap = bitmap;
        this.bitmapPaint = bitmapPaint;
        this.path = path;
        this.paint = paint;
        invalidate();
    }

    public void setPainter(Painter painter) {
        this.painter = painter;
    }
}
</code></pre>

<p>I thought that if I uses ExecutorService then the application can draw in another thread, but it doesn't work - when I draw the screen of device blinkes. So, please, tell me, how can I use multithreading for drawing using SurfaceHolder and other elements? I need to make as few as possible changes in my code.</p>
