head_portrait.setImageBitmap(ToRoundBitmap.toRoundBitmap(bt));

 1 package com.ghp.tools; 2  3 import android.graphics.Bitmap; 4 import android.graphics.Canvas; 5 import android.graphics.Color; 6 import android.graphics.Paint; 7 import android.graphics.PorterDuffXfermode; 8 import android.graphics.Rect; 9 import android.graphics.Bitmap.Config;10 11 public class ToRoundBitmap {12     /**13      * 转成圆形图片14      * 15      * @param bitmap16      * @return17      */18     public static Bitmap toRoundBitmap(Bitmap bitmap) {19         int width = bitmap.getWidth();20         int height = bitmap.getHeight();21 22         final int color = Color.parseColor("#00FF00");23         // defaultWidth = width;24         // defaultHeight = height;25 26         float roundPx;27         float left, top, right, bottom, dst_left, dst_top, dst_right, dst_bottom;28         if (width <= height) { // 高大于宽29             roundPx = width / 2;30             left = 0;31             top = 0;32             right = width;33             bottom = width;34             height = width;35             dst_left = 0;36             dst_top = 0;37             dst_right = width;38             dst_bottom = width;39         } else { // 宽大于高40             roundPx = height / 2;41             float clip = (width - height) / 2;42             left = clip;43             right = width - clip;44             top = 0;45             bottom = height;46             width = height;47             dst_left = 0;48             dst_top = 0;49             dst_right = height;50             dst_bottom = height;51         }52 53         Bitmap output = Bitmap.createBitmap(width, height, Config.ARGB_8888);54         Canvas canvas = new Canvas(output);55 56         final Paint paint = new Paint();57         paint.setAntiAlias(true);// 设置画笔无锯齿58 59         final Rect src = http://www.mamicode.com/new Rect((int) left, (int) top, (int) right,60                 (int) bottom);61         final Rect dst = new Rect((int) dst_left, (int) dst_top,62                 (int) dst_right, (int) dst_bottom);63         canvas.drawARGB(0, 0, 0, 0); // 填充整个Canvas64         paint.setColor(color);65         paint.setDither(true);66 67         canvas.drawCircle(roundPx, roundPx, roundPx, paint);// 画圆68         paint.setXfermode(new PorterDuffXfermode(69                 android.graphics.PorterDuff.Mode.SRC_IN));70         canvas.drawBitmap(bitmap, src, dst, paint); // 以Mode.SRC_IN模式合并bitmap和已经draw了的Circle71 72         return output;73     }74 }