Android自定义ImageView圆形头像

import cn.comnav.evaluationsystem.R;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.NinePatchDrawable;
import android.util.AttributeSet;
import android.widget.ImageView;
/**
 * 圆形ImageView，可设置最多两个宽度不同且颜色不同的圆形边框。
 * 设置颜色在xml布局文件中由自定义属性配置参数指定  
 * @author Administrator
 *
 */
public class RoundImageView extends ImageView{
    private int mBorderThickness = 0;
    private Context mContext; 
    private int defaultColor = 0xFFFFFFFF;
    // 如果只有其中一个有值，则只画一个圆形边框 
    private int mBorderOutsideColor = 0;
    private int mBorderInsideColor = 0; 
    // 控件默认长、宽 
    private int defaultWidth = 0; 
    private int defaultHeight = 0;
    
    

    public RoundImageView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        mContext = context; 
        setCustomAttributes(attrs);
    }

    public RoundImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
        mContext = context; 
        setCustomAttributes(attrs);
    }

    public RoundImageView(Context context) {
        super(context);
        mContext = context; 
    }
    
     private void setCustomAttributes(AttributeSet attrs) {  
            TypedArray a = mContext.obtainStyledAttributes(attrs,R.styleable.roundedimageview);  
            mBorderThickness = a.getDimensionPixelSize(R.styleable.roundedimageview_border_thickness, 0);  
            mBorderOutsideColor = a.getColor(R.styleable.roundedimageview_border_outside_color,defaultColor);  
            mBorderInsideColor = a.getColor(R.styleable.roundedimageview_border_inside_color, defaultColor);  
        } 

     @Override  
    protected void onDraw(Canvas canvas) {  
        Drawable drawable = getDrawable() ;   
        if (drawable == null) {  
            return;  
        }  
        if (getWidth() == 0 || getHeight() == 0) {  
            return;  
        }  
        this.measure(0, 0);  
        if (drawable.getClass() == NinePatchDrawable.class)  
            return;  
        Bitmap b = ((BitmapDrawable) drawable).getBitmap();  
        Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);  
        if (defaultWidth == 0) {  
            defaultWidth = getWidth();  
        }  
        if (defaultHeight == 0) {  
            defaultHeight = getHeight();  
        }  
        int radius = 0;  
        if (mBorderInsideColor != defaultColor && mBorderOutsideColor != defaultColor) {// 定义画两个边框，分别为外圆边框和内圆边框  
            radius = (defaultWidth < defaultHeight ? defaultWidth : defaultHeight) / 2 - 2 * mBorderThickness;  
            // 画内圆  
            drawCircleBorder(canvas, radius + mBorderThickness / 2,mBorderInsideColor);  
            // 画外圆  
            drawCircleBorder(canvas, radius + mBorderThickness + mBorderThickness / 2, mBorderOutsideColor);  
        } else if (mBorderInsideColor != defaultColor && mBorderOutsideColor == defaultColor) {// 定义画一个边框  
            radius = (defaultWidth < defaultHeight ? defaultWidth : defaultHeight) / 2 - mBorderThickness;  
            drawCircleBorder(canvas, radius + mBorderThickness / 2, mBorderInsideColor);  
        } else if (mBorderInsideColor == defaultColor && mBorderOutsideColor != defaultColor) {// 定义画一个边框  
            radius = (defaultWidth < defaultHeight ? defaultWidth : defaultHeight) / 2 - mBorderThickness;  
            drawCircleBorder(canvas, radius + mBorderThickness / 2, mBorderOutsideColor);  
        } else {// 没有边框  
            radius = (defaultWidth < defaultHeight ? defaultWidth : defaultHeight) / 2;  
        }  
        Bitmap roundBitmap = getCroppedRoundBitmap(bitmap, radius);  
        canvas.drawBitmap(roundBitmap, defaultWidth / 2 - radius, defaultHeight / 2 - radius, null);  
    }  
     
     /**  
         * 获取裁剪后的圆形图片  
         * @param radius半径  
         */  
        public Bitmap getCroppedRoundBitmap(Bitmap bmp, int radius) {  
            Bitmap scaledSrcBmp;  
            int diameter = radius * 2;  
            // 为了防止宽高不相等，造成圆形图片变形，因此截取长方形中处于中间位置最大的正方形图片  
            int bmpWidth = bmp.getWidth();  
            int bmpHeight = bmp.getHeight();  
            int squareWidth = 0, squareHeight = 0;  
            int x = 0, y = 0;  
            Bitmap squareBitmap;  
            if (bmpHeight > bmpWidth) {// 高大于宽  
                squareWidth = squareHeight = bmpWidth;  
                x = 0;  
                y = (bmpHeight - bmpWidth) / 2;  
                // 截取正方形图片  
                squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth, squareHeight);  
            } else if (bmpHeight < bmpWidth) {// 宽大于高  
                squareWidth = squareHeight = bmpHeight;  
                x = (bmpWidth - bmpHeight) / 2;  
                y = 0;  
                squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth,squareHeight);  
            } else {  
                squareBitmap = bmp;  
            }  
            if (squareBitmap.getWidth() != diameter || squareBitmap.getHeight() != diameter) {  
                scaledSrcBmp = Bitmap.createScaledBitmap(squareBitmap, diameter,diameter, true);  
            } else {  
                scaledSrcBmp = squareBitmap;  
            }  
            Bitmap output = Bitmap.createBitmap(scaledSrcBmp.getWidth(),  
                    scaledSrcBmp.getHeight(),   
                    Config.ARGB_8888);  
            Canvas canvas = new Canvas(output);  
      
            Paint paint = new Paint();  
            Rect rect = new Rect(0, 0, scaledSrcBmp.getWidth(),scaledSrcBmp.getHeight());  
      
            paint.setAntiAlias(true);  
            paint.setFilterBitmap(true);  
            paint.setDither(true);  
            canvas.drawARGB(0, 0, 0, 0);  
            canvas.drawCircle(scaledSrcBmp.getWidth() / 2,  
                    scaledSrcBmp.getHeight() / 2,   
                    scaledSrcBmp.getWidth() / 2,  
                    paint);  
            paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));  
            canvas.drawBitmap(scaledSrcBmp, rect, rect, paint);  
            bmp = null;  
            squareBitmap = null;  
            scaledSrcBmp = null;  
            return output;  
        }
        
        /**  
         * 边缘画圆  
         */  
        private void drawCircleBorder(Canvas canvas, int radius, int color) {  
            Paint paint = new Paint();  
            /* 去锯齿 */  
            paint.setAntiAlias(true);  
            paint.setFilterBitmap(true);  
            paint.setDither(true);  
            paint.setColor(color);  
            /* 设置paint的　style　为STROKE：空心 */  
            paint.setStyle(Paint.Style.STROKE);  
            /* 设置paint的外框宽度 */  
            paint.setStrokeWidth(mBorderThickness);  
            canvas.drawCircle(defaultWidth / 2, defaultHeight / 2, radius, paint); 
        }                
}

<?xml version="1.0" encoding="utf-8"?>  
<resources>  
    <declare-styleable name="roundedimageview">  
        <attr name="border_thickness" format="dimension" />  
        <attr name="border_inside_color" format="color" />  
        <attr name="border_outside_color" format="color"></attr>  
    </declare-styleable>  
</resources>  

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    xmlns:tools="http://schemas.android.com/tools"  
    xmlns:imagecontrol="http://schemas.android.com/apk/res-auto"  
    android:layout_width="fill_parent"  
    android:layout_height="fill_parent"  
    android:orientation="horizontal"  
    >  
  
    <!-- 没有指定圆形ImageView属性时，默认没有外边圆颜色 -->  
    <!-- 需要将图片资源自定为src ，或在程序中setImageResource(res) 不能设置background为图片，这样不能达到圆形效果-->  
    <com.dxd.roundimageview.RoundImageView   
        android:layout_width="100dp"  
        android:layout_height="100dp"  
        android:src="@drawable/img"  
        />  
    <!-- border_outside_color 外部圆圈的颜色 -->  
    <!-- border_inside_color 内部部圆圈的颜色 -->  
    <!-- border_thickness 外圆和内圆的宽度 -->  
    <com.dxd.roundimageview.RoundImageView   
        android:layout_width="100dp"  
        android:layout_height="100dp"  
        android:src="@drawable/img"  
        imagecontrol:border_inside_color="#bc0978"  
        imagecontrol:border_outside_color="#ba3456"  
        imagecontrol:border_thickness="1dp"  
        />  
</LinearLayout>