【 RoundImageView.java 】

1 package com.dxd.roundimageview;    2 import android.content.Context;    3 import android.content.res.TypedArray;    4 import android.graphics.Bitmap;    5 import android.graphics.Bitmap.Config;    6 import android.graphics.Canvas;    7 import android.graphics.Paint;    8 import android.graphics.PorterDuff.Mode;    9 import android.graphics.PorterDuffXfermode;   10 import android.graphics.Rect;   11 import android.graphics.drawable.BitmapDrawable;   12 import android.graphics.drawable.Drawable;   13 import android.graphics.drawable.NinePatchDrawable;   14 import android.util.AttributeSet;   15 import android.util.Log;   16 import android.widget.ImageView;   17    18 import com.alan.myimageview.R;   19    20 /**   21  * 圆形ImageView，可设置最多两个宽度不同且颜色不同的圆形边框。   22  * 设置颜色在xml布局文件中由自定义属性配置参数指定   23  */   24 public class RoundImageView extends ImageView {   25     private int mBorderThickness = 0;   26     private Context mContext;   27     private int defaultColor = 0xFFFFFFFF;   28     // 如果只有其中一个有值，则只画一个圆形边框   29     private int mBorderOutsideColor = 0;   30     private int mBorderInsideColor = 0;   31     // 控件默认长、宽   32     private int defaultWidth = 0;   33     private int defaultHeight = 0;   34    35     public RoundImageView(Context context) {   36         super(context);   37         mContext = context;   38     }   39    40     public RoundImageView(Context context, AttributeSet attrs) {   41         super(context, attrs);   42         mContext = context;   43         setCustomAttributes(attrs);   44     }   45    46     public RoundImageView(Context context, AttributeSet attrs, int defStyle) {   47         super(context, attrs, defStyle);   48         mContext = context;   49         setCustomAttributes(attrs);   50     }   51    52     private void setCustomAttributes(AttributeSet attrs) {   53         TypedArray a = mContext.obtainStyledAttributes(attrs,R.styleable.roundedimageview);   54         mBorderThickness = a.getDimensionPixelSize(R.styleable.roundedimageview_border_thickness, 0);   55         mBorderOutsideColor = a.getColor(R.styleable.roundedimageview_border_outside_color,defaultColor);   56         mBorderInsideColor = a.getColor(R.styleable.roundedimageview_border_inside_color, defaultColor);   57     }   58    59     @Override   60     protected void onDraw(Canvas canvas) {   61         Drawable drawable = getDrawable() ;    62         if (drawable == null) {   63             return;   64         }   65         if (getWidth() == 0 || getHeight() == 0) {   66             return;   67         }   68         this.measure(0, 0);   69         if (drawable.getClass() == NinePatchDrawable.class)   70             return;   71         Bitmap b = ((BitmapDrawable) drawable).getBitmap();   72         Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);   73         if (defaultWidth == 0) {   74             defaultWidth = getWidth();   75         }   76         if (defaultHeight == 0) {   77             defaultHeight = getHeight();   78         }   79         int radius = 0;   80         if (mBorderInsideColor != defaultColor && mBorderOutsideColor != defaultColor) {
     // 定义画两个边框，分别为外圆边框和内圆边框   81             radius = (defaultWidth < defaultHeight ? defaultWidth : defaultHeight) / 2 - 2 * mBorderThickness;   82             // 画内圆   83             drawCircleBorder(canvas, radius + mBorderThickness / 2,mBorderInsideColor);   84             // 画外圆   85             drawCircleBorder(canvas, radius + mBorderThickness + mBorderThickness / 2, mBorderOutsideColor);   86         } else if (mBorderInsideColor != defaultColor && mBorderOutsideColor == defaultColor) {
     // 定义画一个边框   87             radius = (defaultWidth < defaultHeight ? defaultWidth : defaultHeight) / 2 - mBorderThickness;   88             drawCircleBorder(canvas, radius + mBorderThickness / 2, mBorderInsideColor);   89         } else if (mBorderInsideColor == defaultColor && mBorderOutsideColor != defaultColor) {
     // 定义画一个边框   90             radius = (defaultWidth < defaultHeight ? defaultWidth : defaultHeight) / 2 - mBorderThickness;   91             drawCircleBorder(canvas, radius + mBorderThickness / 2, mBorderOutsideColor);   92         } else {
     // 没有边框   93             radius = (defaultWidth < defaultHeight ? defaultWidth : defaultHeight) / 2;   94         }   95         Bitmap roundBitmap = getCroppedRoundBitmap(bitmap, radius);   96         canvas.drawBitmap(roundBitmap, defaultWidth / 2 - radius, defaultHeight / 2 - radius, null);   97     }   98    99     /**  100      * 获取裁剪后的圆形图片  101      * @param radius半径  102      */  103     public Bitmap getCroppedRoundBitmap(Bitmap bmp, int radius) {  104         Bitmap scaledSrcBmp;  105         int diameter = radius * 2;  106         // 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  107         int bmpWidth = bmp.getWidth();  108         int bmpHeight = bmp.getHeight();  109         int squareWidth = 0, squareHeight = 0;  110         int x = 0, y = 0;  111         Bitmap squareBitmap;  112         if (bmpHeight > bmpWidth) {
     // 高大于宽  113             squareWidth = squareHeight = bmpWidth;  114             x = 0;  115             y = (bmpHeight - bmpWidth) / 2;  116             // 截取正方形图片  117             squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth, squareHeight);  118         } else if (bmpHeight < bmpWidth) {
     // 宽大于高  119             squareWidth = squareHeight = bmpHeight;  120             x = (bmpWidth - bmpHeight) / 2;  121             y = 0;  122             squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth,squareHeight);  123         } else {  124             squareBitmap = bmp;  125         }  126         if (squareBitmap.getWidth() != diameter || squareBitmap.getHeight() != diameter) {  127             scaledSrcBmp = Bitmap.createScaledBitmap(squareBitmap, diameter,diameter, true);  128         } else {  129             scaledSrcBmp = squareBitmap;  130         }  131         Bitmap output = Bitmap.createBitmap(scaledSrcBmp.getWidth(),  132                 scaledSrcBmp.getHeight(),   133                 Config.ARGB_8888);  134         Canvas canvas = new Canvas(output);  135   136         Paint paint = new Paint();  137         Rect rect = new Rect(0, 0, scaledSrcBmp.getWidth(),scaledSrcBmp.getHeight());  138   139         paint.setAntiAlias(true);  140         paint.setFilterBitmap(true);  141         paint.setDither(true);  142         canvas.drawARGB(0, 0, 0, 0);  143         canvas.drawCircle(scaledSrcBmp.getWidth() / 2,  144                 scaledSrcBmp.getHeight() / 2,   145                 scaledSrcBmp.getWidth() / 2,  146                 paint);  147         paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));  148         canvas.drawBitmap(scaledSrcBmp, rect, rect, paint);  149         bmp = null;  150         squareBitmap = null;  151         scaledSrcBmp = null;  152         return output;  153     }  154   155     /**  156      * 边缘画圆  157      */  158     private void drawCircleBorder(Canvas canvas, int radius, int color) {  159         Paint paint = new Paint();  160         /* 去锯齿 */  161         paint.setAntiAlias(true);  162         paint.setFilterBitmap(true);  163         paint.setDither(true);  164         paint.setColor(color);  165         /* 设置paint的　style　为STROKE：空心 */  166         paint.setStyle(Paint.Style.STROKE);  167         /* 设置paint的外框宽度 */  168         paint.setStrokeWidth(mBorderThickness);  169         canvas.drawCircle(defaultWidth / 2, defaultHeight / 2, radius, paint);  170     }  171 }

1、定义自己的属性配置文件：attr.xml

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2、在xml配置中使用控件：activity_main.xml

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3、主Activity中没有相关代码，直接加载布局文件即可。