如何使onDraw绘图更平滑

Question

I am moving an image from top of the screen till it reaches the bottom of the screen to give it a dropping pin like effect. It is working fine but the problem is with the animating effects. I want this to be as smooth as possible but I can easily find jerks in this dropping effect.

I have used a Surfaceview and a thread to achieve this. Thread keeps on updating the image's position by one pixel and call Surfaceview's onDraw(canvas) method where the image with updated coordinates gets drawn.

Here is some code snippet. First the drawing thread that keeps on updating my image coordinates by some pixels.

while(mRun){
    canvas = null;
    try{
        canvas = mSurfaceHolder.lockCanvas();
        //increment the coordinate by 5 pixels
            image.getCoordinate.setX(image.getCoordinate.getX + 5);
            image.getCoordinate.setY(image.getCoordinate.getY + 5);

        synchronized (mSurfaceHolder) {

            //call onDraw method to update position on canvas
            mPanel.onDraw(canvas);
        }

    }finally{
        if(canvas != null){
            mPanel.getSurfaceHolder().unlockCanvasAndPost(canvas);
        }
    }
}

Then the onDraw method from my SurfaceView class that draws the updated image on the canvas :

canvas.drawBitmap(image, image.getCoordinate().getX(),image.getCoordinate().getY(), null);

This seems to be simple but there are jerks and I am looking for some ways to avoid these jerks.

Thanks in advance.

Answer 1

@Saurabh Pareek : Thanks buddy for your nice suggestion.

I was testing the same on the emulator. But when I tried to run the same on a Device, it worked fine. No jerk and pretty nice animation.