实现Android图片圆角

public static Bitmap toRoundCorner(Bitmap bitmap, int pixels) {                    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 = pixels;            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;      }

使用示例：

 LinearLayout layout = (LinearLayout) findViewById(R.id.layout);        Drawable drawable = getResources().getDrawable(R.drawable.bg);        BitmapDrawable bitmapDrawable = (BitmapDrawable) drawable;        Bitmap bitmap = bitmapDrawable.getBitmap();                BitmapDrawable bbb = new BitmapDrawable(toRoundCorner(bitmap, 30));        layout.setBackgroundDrawable(bbb);

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