How can I draw individually on surfaceView?

Question

I want to build a dx ball game. In my game, I want to draw a ball, a bar, bricks individually. It means when ball position is ready, the ball will draw; when bricks are ready bricks will draw. In the normal way, I lock surface holder then draw everything. Example:

@Override
public void run() {
    while(ballPlay){
        try{
            gameCanvas = null;

            gameCanvas = surfaceHolder.lockCanvas();
            gameCanvas.drawColor(Color.WHITE);
            ballPosition.drawBall(gameCanvas);
            for (int i = 0; i < brickCount; i++) {
                brick[i].drawBrick(gameCanvas);
            }
            gameBar.drawBar(gameCanvas);
        }catch (Exception e){
            e.printStackTrace();
        } finally {
            if(gameCanvas!=null){
                surfaceHolder.unlockCanvasAndPost(gameCanvas);
            }
        }
    }
}

Then, we unlock it and post. But, how can I draw everything separately?