Android圆形图片--ImageView

【 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

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>  

2、在xml配置中使用控件：activity_main.xml

 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> 

3、主Activity中没有相关代码，直接加载布局文件即可。