android 圖片處理之制作圓角圖片

以下是改進一個前人做的圓角圖片的例子，少創建一次bitmap public static Bitmap roundCorners(final Bitmap source, final float radius) {         int width = source.getWidth();         int height = source.getHeight();           Paint paint = new Paint();         paint.setAntiAlias(true);         paint.setColor(android.graphics.Color.WHITE);           Bitmap clipped = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);         Canvas canvas = new Canvas(clipped);         canvas.drawRoundRect(new RectF(0, 0, width, height), radius, radius,                 paint);                  paint.setXfermode(new PorterDuffXfermode(android.graphics.PorterDuff.Mode.SRC_IN));         canvas.drawBitmap(source, 0, 0, paint);                  source.recycle();           return clipped;     }     原例：     /**      * Round the corners of a {@link Bitmap}      *      * @param source      * @param radius      * @return rounded corner bitmap      */     public static Bitmap roundCorners(final Bitmap source, final float radius) {         int width = source.getWidth();         int height = source.getHeight();           Paint paint = new Paint();         paint.setAntiAlias(true);         paint.setColor(WHITE);           Bitmap clipped = Bitmap.createBitmap(width, height, ARGB_8888);         Canvas canvas = new Canvas(clipped);         canvas.drawRoundRect(new RectF(0, 0, width, height), radius, radius,                 paint);         paint.setXfermode(new PorterDuffXfermode(DST_IN));           Bitmap rounded = Bitmap.createBitmap(width, height, ARGB_8888);         canvas = new Canvas(rounded);         canvas.drawBitmap(source, 0, 0, null);         canvas.drawBitmap(clipped, 0, 0, paint);           source.recycle();         clipped.recycle();           return rounded;     }