仿支付宝头像外加一个边框的工具类

边框的工具类"/>

仿支付宝头像外加一个边框的工具类

代码：

/*** 获取圆角矩形或圆形图片的方法** @param bitmap 待处理 bitmap 对象* @param pixels 圆角半径，x 和 y 相等* @return 返回圆角或者圆形 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：一定要先画圆角矩形canvas.drawRoundRect(rectF, roundPx, roundPx, paint);paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));canvas.drawBitmap(bitmap, rect, rect, paint);return output;}/*** 获取待边框的圆角矩形或圆形图片方法** @param resources          {@link Resources}* @param resId              对应资源 id* @param borderCornerRadius 边框圆角半径，x 和 y 相等* @return 圆角矩形或圆形 bitmap 对象*/public static Bitmap getRoundCornerBitmapWithBorder(Resources resources, int resId, int borderCornerRadius) {Bitmap src = BitmapFactory.decodeResource(resources, resId);Bitmap temp_out = getRoundedCornerBitmap(src, 0);//图片默认为矩形的Bitmap out = Bitmap.createBitmap(temp_out.getWidth(), temp_out.getHeight(), Bitmap.Config.ARGB_8888);//新建画布Canvas canvas = new Canvas(out);//原始大小的矩形Rect rect = new Rect(0, 0, temp_out.getWidth(), temp_out.getHeight());//矩形宽高的两边都缩小 10Rect insetRect = new Rect(rect);//外面白色变宽宽度 默认为 10final int borderWidth = 8;//缩小矩形insetRect.inset(borderWidth, borderWidth);Paint paint = new Paint();//把图像信息画在缩小后的矩形区域内canvas.drawBitmap(temp_out, rect, insetRect, paint);paint.setAntiAlias(true);paint.setColor(0xFFCE3D3A);paint.setStyle(Paint.Style.STROKE);paint.setStrokeWidth(borderWidth);//画边框线canvas.drawRoundRect(new RectF(insetRect), borderCornerRadius, borderCornerRadius, paint);return out;}

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

安卓 Paint 的 Xfermode

调用：

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

效果：