代碼：

/*** 獲取圓角矩形或圓形圖片的方法** @param bitmap 待處理 bitmap 對象* @param pixels 圓角半徑，x 和 y 相等* @return 返回圓角或者圓形 bitmap*/public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, int pixels) {Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_8888);Canvas canvas = new Canvas(output);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);//柱：一定要先畫圓角矩形canvas.drawRoundRect(rectF, roundPx, roundPx, paint);paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));canvas.drawBitmap(bitmap, rect, rect, paint);return output;}/*** 獲取待邊框的圓角矩形或圓形圖片方法** @param resources {@link Resources}* @param resId 對應資源 id* @param borderCornerRadius 邊框圓角半徑，x 和 y 相等* @return 圓角矩形或圓形 bitmap 對象*/public static Bitmap getRoundCornerBitmapWithBorder(Resources resources, int resId, int borderCornerRadius) {Bitmap src = BitmapFactory.decodeResource(resources, resId);Bitmap temp_out = getRoundedCornerBitmap(src, 0);//圖片默認為矩形的Bitmap out = Bitmap.createBitmap(temp_out.getWidth(), temp_out.getHeight(), Bitmap.Config.ARGB_8888);//新建畫布Canvas canvas = new Canvas(out);//原始大小的矩形Rect rect = new Rect(0, 0, temp_out.getWidth(), temp_out.getHeight());//矩形寬高的兩邊都縮小 10Rect insetRect = new Rect(rect);//外面白色變寬寬度 默認為 10final int borderWidth = 8;//縮小矩形insetRect.inset(borderWidth, borderWidth);Paint paint = new Paint();//把圖像信息畫在縮小后的矩形區域內canvas.drawBitmap(temp_out, rect, insetRect, paint);paint.setAntiAlias(true);paint.setColor(0xFFCE3D3A);paint.setStyle(Paint.Style.STROKE);paint.setStrokeWidth(borderWidth);//畫邊框線canvas.drawRoundRect(new RectF(insetRect), borderCornerRadius, borderCornerRadius, paint);return out;}

注：getRoundedCornerBitmap() 方法中一定要先畫圓角矩形，原因可以看一下上篇文章：

安卓 Paint 的 Xfermode

調用：

iv.setImageBitmap(BitmapHelper.getRoundCornerBitmapWithBorder(getResources(), R.mipmap.icon_avater, 14));

效果：

總結

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