Android圆形图片--ImageView

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

 1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
 2     xmlns:tools="http://schemas.android.com/tools"  
 3     xmlns:imagecontrol="http://schemas.android.com/apk/res-auto"  
 4     android:layout_width="fill_parent"  
 5     android:layout_height="fill_parent"  
 6     android:orientation="horizontal"  
 7     >  
 8   
 9     <!-- 没有指定圆形ImageView属性时，默认没有外边圆颜色 -->  
10     <!-- 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-->  
11     <com.dxd.roundimageview.RoundImageView   
12         android:layout_width="100dp"  
13         android:layout_height="100dp"  
14         android:src="@drawable/img"  
15         />  
16     <!-- border_outside_color 外部圆圈的颜色 -->  
17     <!-- border_inside_color 内部部圆圈的颜色 -->  
18     <!-- border_thickness 外圆和内圆的宽度 -->  
19     <com.dxd.roundimageview.RoundImageView   
20         android:layout_width="100dp"  
21         android:layout_height="100dp"  
22         android:src="@drawable/img"  
23         imagecontrol:border_inside_color="#bc0978"  
24         imagecontrol:border_outside_color="#ba3456"  
25         imagecontrol:border_thickness="1dp"  
26         />  
27 </LinearLayout>