Android 无法在位图上绘制圆？

我可以显示位图，但我正在绘制的圆圈不显示。我不确定我错过了什么

private void loadImage() {
    File f = new File(imagesPath, currImageName);

    Bitmap bitmap = BitmapFactory.decodeFile(f.getAbsolutePath());
    BitmapDrawable bitmapDrawable = new BitmapDrawable(bitmap);

    Paint paint = new Paint();
    paint.setAntiAlias(true);
    paint.setColor(Color.BLUE);
    canvas = new Canvas();
    canvas.drawCircle(60, 50, 25, paint);
    bitmapDrawable.draw(canvas);

    ImageView imageView = (ImageView)findViewById(R.id.imageview);
    imageView.setAdjustViewBounds(true);
    imageView.setImageDrawable(bitmapDrawable);
}

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代码不是在位图上绘制，而是将位图绘制到画布中，然后在画布的位图上绘制一个圆。结果就被扔掉了。然后将原始位图（未更改）设置到ImageView中

您需要使用位图创建画布。然后绘制方法将在位图上绘制

    Bitmap bitmap = BitmapFactory.decodeFile(f.getAbsolutePath());

    Paint paint = new Paint();
    paint.setAntiAlias(true);
    paint.setColor(Color.BLUE);

         // create canvas to draw on the bitmap
    Canvas canvas = new Canvas(bitmap);
    canvas.drawCircle(60, 50, 25, paint);

    ImageView imageView = (ImageView)findViewById(R.id.imageview);
    imageView.setAdjustViewBounds(true);
    imageView.setImageBitmap(bitmap);

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谢谢，伙计，我很感激。