package com.kale.utils;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.PorterDuffXfermode;import android.graphics.Rect;import android.graphics.RectF;import android.graphics.Bitmap.Config;import android.graphics.PorterDuff.Mode;import android.graphics.drawable.BitmapDrawable;import android.graphics.drawable.Drawable;public class CircleImageManager {    /**     * @param context 对象     * @param resId 图片资源的id     * @return 一个圆形的Drawable对象     */    public static Drawable getCircleDrawable(Context context,int resId) {        Bitmap bitmap = getCircleBitmap(context, resId);        Drawable drawable = new BitmapDrawable(context.getResources(), bitmap);        return drawable;    }            /**     * @param context     * @param resId     * @return 转换好的bitmap对象     */    public static Bitmap getCircleBitmap(Context context,int resId) {        Bitmap bitmap = BitmapFactory.decodeResource(context.getResources(), resId);        int width = bitmap.getWidth();        int height = bitmap.getHeight();        float roundPx;        float left, top, right, bottom, dst_left, dst_top, dst_right, dst_bottom;        if (width <= height) {            roundPx = width / 2;            left = 0;            top = 0;            right = width;            bottom = width;            height = width;            dst_left = 0;            dst_top = 0;            dst_right = width;            dst_bottom = width;        } else {            roundPx = height / 2;            float clip = (width - height) / 2;            left = clip;            right = width - clip;            top = 0;            bottom = height;            width = height;            dst_left = 0;            dst_top = 0;            dst_right = height;            dst_bottom = height;        }        Bitmap output = Bitmap.createBitmap(width, height, Config.ARGB_8888);        Canvas canvas = new Canvas(output);        final Paint paint = new Paint();        final Rect src = http://www.mamicode.com/new Rect((int) left, (int) top, (int) right, (int) bottom);        final Rect dst = new Rect((int) dst_left, (int) dst_top, (int) dst_right, (int) dst_bottom);        final RectF rectF = new RectF(dst);        paint.setAntiAlias(true);// 设置画笔无锯齿        canvas.drawARGB(0, 0, 0, 0); // 填充整个Canvas        // 以下有两种方法画圆,drawRounRect和drawCircle        canvas.drawRoundRect(rectF, roundPx, roundPx, paint);// 画圆角矩形，第一个参数为图形显示区域，第二个参数和第三个参数分别是水平圆角半径和垂直圆角半径。        // canvas.drawCircle(roundPx, roundPx, roundPx, paint);        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));// 设置两张图片相交时的模式,参考http://trylovecatch.iteye.com/blog/1189452        canvas.drawBitmap(bitmap, src, dst, paint); // 以Mode.SRC_IN模式合并bitmap和已经draw了的Circle        return output;    }}