Bitmap长方形图片加载为圆形图片

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package com.lib.andlib_libtemp.example.dir.exam1;

import android.graphics.Bitmap;
import android.graphics.Matrix;
import android.view.View;

import com.lib.andlib_libtemp.utils.LogUtil;

/**
 * Created by envy15 on 2016/6/16.
 * 根据View的比例剪切图片大小工具类
 * 剪切模式：中间、上、下
 */
public class BitmapCatUtil {
    public static Bitmap imageCatByCenter(View mView, Bitmap source) {
        //先获取View的高度，获取失败将返回原图
        getImageViewPixSize(mView);
        /**
         * 获取图片Bitmap的宽高
         */
        int suWidth = source.getWidth();
        int suHeight = source.getHeight();
        if(ivWidth == 0 || ivHeight == 0)
        {
            LogUtil.infoE("获取View宽高失败：ivHeight=" + ivHeight +"  ivWidth=" + ivWidth);
            return source;
        }

        /**
         * Y方向上应该截取的长度
         */
        int yAxisAdd = ivHeight * suWidth / ivWidth;

        if (yAxisAdd == suHeight) {   //!!!
            //裁剪的宽高与图片的宽高一样时，bitmap的返回的引用是source，因此不能回收，直接返回
            //回收抛异常：java.lang.IllegalStateException: Transformation SizeTransformation returned input Bitmap but recycled it
            return source;
        } else {
            //按比例截取多余的高度
            if (yAxisAdd < suHeight)   //截取的高度需小于源图片的高度
            {
                //(起点左边，截取宽度，截取高度)
                Bitmap bitmap = Bitmap.createBitmap(source,
                        0, suHeight / 2 - yAxisAdd / 2,
                        suWidth,yAxisAdd);
                source.recycle();
                return bitmap;
            } else { //否则需按比例截取宽度
                int xAxisAdd = ivWidth * suHeight / ivHeight;
                Bitmap bitmap = Bitmap.createBitmap(source,
                        suWidth / 2 - xAxisAdd / 2, 0,
                        xAxisAdd, suHeight);
                source.recycle();

                return bitmap;
            }
        }
    }

    /**
     * 返回图片控件表示的宽高像素大小
     * 必须指定图片的大小，wrap_content/match_parent均无法获取宽高
     * 参考
     * http://blog.csdn.net/crazy1235/article/details/41806079
     */
    private static int ivHeight;
    private static int ivWidth;
    private static void getImageViewPixSize(View imageView) {
        //获取宽高OK
        ivHeight = imageView.getLayoutParams().height;
        ivWidth = imageView.getLayoutParams().width;
    }

    /**
     * 获取Bitmap缩放比例
     */
    public static float catScale(View mView, Bitmap bitmap) {
        return mView.getLayoutParams().height*1.0f/bitmap.getHeight();
    }

    /**
     * Bitmap放大/缩小的方法
     * @param bitmap
     * @return bitmap
     */
    public static Bitmap bitmapScaling(Bitmap bitmap,float scale) {
        Matrix matrix = new Matrix();
        matrix.postScale(scale,scale); //长和宽放大缩小的比例
        Bitmap resizeBmp = Bitmap.createBitmap(bitmap,0,0,bitmap.getWidth(),bitmap.getHeight(),matrix,true);
        return resizeBmp;
    }
}

+++++++++++++++++++++++++++++++

package com.lib.andlib_libtemp.example.dir.exam1;

import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.view.View;

/**
 * Created by envy15 on 2016/6/16.
 * 位图的绘制工具类：圆角
 *
 */
public class BitmapShapeUtil {
    /**四个圆角的圆角图片
     * 四个圆角，roundRadius = bitmap.getWidth()/2 绘制为圆形图像
     * @param bitmap 位图
     * @param roundRadius 圆角大小
     * @return 圆角图片
     */
    public static Bitmap getRoundedCornerBitmap(Bitmap bitmap,float roundRadius) {
        // 创建一个指定宽度和高度的空位图对象
        Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),
                bitmap.getHeight(), Bitmap.Config.ARGB_8888);
        // 用该位图创建画布
        Canvas canvas = new Canvas(output);
        // 画笔对象
        final Paint paint = new Paint();
        // 画笔的颜色
        final int color = 0xff424242;
        // 矩形区域对象
        final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
        // 未知
        final RectF rectF = new RectF(rect);
        // 拐角的半径
        final float roundPx = roundRadius;
        // 消除锯齿
        paint.setAntiAlias(true);
        // 画布背景色
        canvas.drawARGB(0, 0, 0, 0);
        // 设置画笔颜色
        paint.setColor(color);
        // 绘制圆角矩形
        canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
        // 未知
        paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
        // 把该图片绘制在该圆角矩形区域中
        canvas.drawBitmap(bitmap, rect, rect, paint);
        // 最终在画布上呈现的就是该圆角矩形图片，然后我们返回该Bitmap对象
        return output;
    }

    /**可实现动态绘制圆角
     * 生成四个圆角的背景
     * @param mView 根据View计算Drawable大小
     * @param roundRadius 绘制半径
     * @return Drawable
     * exam imageView.setBackground(BitmapShapeUtil.getRoundedCornerDrawable(imageView,imageView.
     *       getLayoutParams().width/5, Color.GRAY));
     */
    public static Drawable getRoundedCornerDrawable(View mView, float roundRadius,int color) {
        int hight = mView.getLayoutParams().height;
        int width = mView.getLayoutParams().width;
        Bitmap rounder = Bitmap.createBitmap(width, hight, Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(rounder);
        Paint xferPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        xferPaint.setColor(color);
        canvas.drawRoundRect(new RectF(0, 0, width, hight), roundRadius, roundRadius, xferPaint);
        xferPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN));
        canvas.drawBitmap(rounder, 0, 0, null);
        canvas.drawBitmap(rounder, 0, 0, xferPaint);

        Drawable drawable = new BitmapDrawable(rounder);
        return drawable;
    }
}

+++++++++++++++++++++++++++++++

    @Override
    public void initDatas() {
        LogUtil.infoD(this, "initDatas");
        //OK
        Bitmap bitmap = BitmapFactory.decodeResource(getResources(),R.mipmap.image_girl_test1);
        LogUtil.infoE(this,bitmap.getHeight()+" "+bitmap.getWidth());
        //裁剪图片
        bitmap = BitmapCatUtil.imageCatByCenter(imageView,bitmap);
        LogUtil.infoE(this,bitmap.getHeight()+" "+bitmap.getWidth());
        LogUtil.infoE(this,imageView.getLayoutParams().height+" "+imageView.getLayoutParams().width);
        //缩放处理
        bitmap = BitmapCatUtil.bitmapScaling(bitmap,BitmapCatUtil.catScale(imageView,bitmap));
        //圆角处理
        Bitmap roundedCornerBitmap = BitmapShapeUtil.getRoundedCornerBitmap(
                bitmap,bitmap.getWidth()/2);
        imageView.setImageBitmap(roundedCornerBitmap);


//        imageView.setBackground(BitmapShapeUtil.getRoundedCornerDrawable(imageView,imageView.
//                getLayoutParams().width/5, Color.GRAY));


    }

Bitmap长方形图片加载为圆形图片

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原文地址：http://www.cnblogs.com/zhen-android/p/5716919.html