Android开发实现图片圆角的方法

Bitmap myCoolBitmap = ... ; // <-- Your bitmap you want roundedint w = myCoolBitmap.getWidth(), h = myCoolBitmap.getHeight();Bitmap rounder = Bitmap.createBitmap(w,h,Bitmap.Config.ARGB_8888);Canvas canvas = new Canvas(rounder);Paint xferPaint = new Paint(Paint.ANTI_ALIAS_FLAG);xferPaint.setColor(Color.RED);canvas.drawRoundRect(new RectF(0,0,w,h), 20.0f, 20.0f, xferPaint);xferPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN));canvas.drawBitmap(myCoolBitmap, 0,0, null);canvas.drawBitmap(rounder, 0, 0, xferPaint);

public static Bitmap getRoundedCornerBitmap(Bitmap bitmap) {  Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),    bitmap.getHeight(), Config.ARGB_8888);  Canvas canvas = new Canvas(output);  final int color = 0xff424242;  final Paint paint = new Paint();  final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());  final RectF rectF = new RectF(rect);  final float roundPx = 12;  paint.setAntiAlias(true);  canvas.drawARGB(0, 0, 0, 0);  paint.setColor(color);  canvas.drawRoundRect(rectF, roundPx, roundPx, paint);  paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));  canvas.drawBitmap(bitmap, rect, rect, paint);  return output;}