Android圆形图片--ImageView

【 RoundImageView.java 】

 package com.dxd.roundimageview;
 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.util.Log;
 import android.widget.ImageView;  

 import com.alan.myimageview.R;  

 /**
  * 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
  */
 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) {
         super(context);
         mContext = context;
     }  

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

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

     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);
     }
 }  

1、定义自己的属性配置文件：attr.xml

 <?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>  

2、在xml配置中使用控件：activity_main.xml

 <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> 

3、主Activity中没有相关代码，直接加载布局文件即可。