【 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>
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>