CircleImageManager ——将图片转换为圆形图片的类

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 = 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;
    }
}