Java Android：如何以编程方式只对位图的上角进行圆角？

我目前正在使用以下代码：

@Override
public Bitmap transform(Bitmap source) {
    Bitmap result = Bitmap.createBitmap(source.getWidth(), source.getHeight(), Config.ARGB_8888);
    Canvas canvas = new Canvas(result);

    final int color = 0xff424242;
    final Paint paint = new Paint();
    final Rect rect = new Rect(0, 0, source.getWidth(),source.getHeight());
    final RectF rectF = new RectF(rect);

    final float scale = context.getResources().getDisplayMetrics().density;
    final float roundDp = 10 * scale;

    paint.setAntiAlias(true);
    canvas.drawARGB(0, 0, 0, 0);
    paint.setColor(color);
    canvas.drawRoundRect(rectF, roundDp, roundDp, paint);

    paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
    canvas.drawBitmap(source, rect, rect, paint);
    source.recycle();
    return result;
}

但问题是，这种方法只允许我一次修改所有4个角点。如何仅使图像的底角圆角

以下是您的答案：

以及onDraw函数：

 @Override
 protected void onDraw(Canvas canvas) {
//super.onDraw(canvas);
    Drawable drawable = getDrawable();

    Bitmap b =  ((BitmapDrawable)drawable).getBitmap() ;
    Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);

    int w = getWidth(), h = getHeight();


    Bitmap roundBitmap =  CropImageView.getRoundedCornerBitmap( getContext(), bitmap,10 , w, h , true, false,true, false);
    canvas.drawBitmap(roundBitmap, 0,0 , null);
}

---

Igor，那必须是编写

getRoundedCornerBitmap

的类。这只是一个静态方法调用。让我开心！非常感谢。

 @Override
 protected void onDraw(Canvas canvas) {
//super.onDraw(canvas);
    Drawable drawable = getDrawable();

    Bitmap b =  ((BitmapDrawable)drawable).getBitmap() ;
    Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);

    int w = getWidth(), h = getHeight();


    Bitmap roundBitmap =  CropImageView.getRoundedCornerBitmap( getContext(), bitmap,10 , w, h , true, false,true, false);
    canvas.drawBitmap(roundBitmap, 0,0 , null);
}