Android开发之制作圆形头像自定义View,直接引用工具类，加快开发速度。带有源代码学习

作者：程序员小冰，CSDN博客：http://blog.csdn.net/qq_21376985
QQ986945193 博客园主页：http://www.cnblogs.com/mcxiaobing/

Android开发之制作圆形头像自定义View,直接引用工具类，加快开发速度。带有源代码学习

大家都知道。现在好多头像都是圆形的，不再是以前的正方形或者长方形。
因此今天给大家带来的就是如何制作一个圆形头像。下面是效果图：

当然利用一个自定义View集成ImageView即可。

1package com.qq986945193.zoomimageviewrounddemo;
2
3import android.content.Context;
4import android.content.res.TypedArray;
5import android.graphics.Bitmap;
6import android.graphics.Bitmap.Config;
7import android.graphics.Canvas;
8import android.graphics.Paint;
9import android.graphics.PorterDuff.Mode;
10import android.graphics.PorterDuffXfermode;
11import android.graphics.Rect;
12import android.graphics.drawable.BitmapDrawable;
13import android.graphics.drawable.Drawable;
14import android.graphics.drawable.NinePatchDrawable;
15import android.util.AttributeSet;
16import android.widget.ImageView;
17
18/** * 微博：http://weibo.com/mcxiaobing * ============================================================================ * Copyright (c) 2015-2016 QQ986945193 All rights reserved. * ---------------------------------------------------------------------------- * 类名：自定义圆形头像View * ---------------------------------------------------------------------------- * 功能描述：http://blog.csdn.net/qq_21376985 * ---------------------------------------------------------------------------- */
19
20public class RoundImageView extends ImageView {
21    private int mBorderThickness = 0;
22    private Context mContext;
23    private int defaultColor = 0xFFFFFFFF;
24    // 如果只有其中一个有值，则只画一个圆形边框
25    private int mBorderOutsideColor = 0;// 图片的外边界
26    private int mBorderInsideColor = 0;// 图片的内边界
27    // 控件默认长、宽
28    private int defaultWidth = 0;
29    private int defaultHeight = 0;
30
31    public RoundImageView(Context context) {
32        super(context);
33        mContext = context;
34    }
35
36    public RoundImageView(Context context, AttributeSet attrs) {
37        super(context, attrs);
38        mContext = context;
39        setCustomAttributes(attrs);
40    }
41
42    public RoundImageView(Context context, AttributeSet attrs, int defStyle) {
43        super(context, attrs, defStyle);
44        mContext = context;
45        setCustomAttributes(attrs);
46    }
47
48    private void setCustomAttributes(AttributeSet attrs) {
49        TypedArray a = mContext.obtainStyledAttributes(attrs,
50                R.styleable.RoundImageView);
51        // 边界的宽度
52        mBorderThickness = a.getDimensionPixelSize(
53                R.styleable.RoundImageView_border_thickness, 0);
54        // 外边界的颜色
55        mBorderOutsideColor = a.getColor(
56                R.styleable.RoundImageView_border_outside_color, defaultColor);
57        // 内边界的颜色
58        mBorderInsideColor = a.getColor(
59                R.styleable.RoundImageView_border_inside_color, defaultColor);
60    }
61
62    @Override
63    protected void onDraw(Canvas canvas) {
64        Drawable drawable = getDrawable();
65        if (drawable == null) {
66            return;
67        }
68
69        if (getWidth() == 0 || getHeight() == 0) {
70            return;
71        }
72        this.measure(0, 0);
73        if (drawable.getClass() == NinePatchDrawable.class)
74            return;
75        Bitmap b = ((BitmapDrawable) drawable).getBitmap();
76        Bitmap bitmap = b.copy(Config.ARGB_8888, true);
77        if (defaultWidth == 0) {
78            defaultWidth = getWidth();
79        }
80        if (defaultHeight == 0) {
81            defaultHeight = getHeight();
82        }
83        // 保证重新读取图片后不会因为图片大小而改变控件宽、高的大小（针对宽、高为wrap_content布局的imageview，但会导致margin无效）
84        // if (defaultWidth != 0 && defaultHeight != 0) {
85        // LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
86        // defaultWidth, defaultHeight);
87        // setLayoutParams(params);
88        // }
89
90        int radius = 0;
91        if (mBorderInsideColor != defaultColor
92                && mBorderOutsideColor != defaultColor) {// 定义画两个边框，分别为外圆边框和内圆边框
93            radius = (defaultWidth < defaultHeight ? defaultWidth
94                    : defaultHeight) / 2 - 2 * mBorderThickness;
95            // 画内圆
96            drawCircleBorder(canvas, radius + mBorderThickness / 2,
97                    mBorderInsideColor);
98            // 画外圆
99            drawCircleBorder(canvas, radius + mBorderThickness
100                    + mBorderThickness / 2, mBorderOutsideColor);
101        } else if (mBorderInsideColor != defaultColor
102                && mBorderOutsideColor == defaultColor) {// 定义画一个边框
103            radius = (defaultWidth < defaultHeight ? defaultWidth
104                    : defaultHeight) / 2 - mBorderThickness;
105            drawCircleBorder(canvas, radius + mBorderThickness / 2,
106                    mBorderInsideColor);
107        } else if (mBorderInsideColor == defaultColor
108                && mBorderOutsideColor != defaultColor) {// 定义画一个边框
109            radius = (defaultWidth < defaultHeight ? defaultWidth
110                    : defaultHeight) / 2 - mBorderThickness;
111            drawCircleBorder(canvas, radius + mBorderThickness / 2,
112                    mBorderOutsideColor);
113        } else {// 没有边框
114            radius = (defaultWidth < defaultHeight ? defaultWidth
115                    : defaultHeight) / 2;
116        }
117        Bitmap roundBitmap = getCroppedRoundBitmap(bitmap, radius);
118        canvas.drawBitmap(roundBitmap, defaultWidth / 2 - radius, defaultHeight
119                / 2 - radius, null);
120    }
121
122    /** * 获取裁剪后的圆形图片 * * http://blog.csdn.net/qq_21376985 * @param radius * 半径 */
123    public Bitmap getCroppedRoundBitmap(Bitmap bmp, int radius) {
124        Bitmap scaledSrcBmp;
125        int diameter = radius * 2;
126
127        // 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
128        int bmpWidth = bmp.getWidth();
129        int bmpHeight = bmp.getHeight();
130        int squareWidth = 0, squareHeight = 0;
131        int x = 0, y = 0;
132        Bitmap squareBitmap;
133        if (bmpHeight > bmpWidth) {// 高大于宽
134            squareWidth = squareHeight = bmpWidth;
135            x = 0;
136            y = (bmpHeight - bmpWidth) / 2;
137            // 截取正方形图片
138            squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth,
139                    squareHeight);
140        } else if (bmpHeight < bmpWidth) {// 宽大于高
141            squareWidth = squareHeight = bmpHeight;
142            x = (bmpWidth - bmpHeight) / 2;
143            y = 0;
144            squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth,
145                    squareHeight);
146        } else {
147            squareBitmap = bmp;
148        }
149
150        if (squareBitmap.getWidth() != diameter
151                || squareBitmap.getHeight() != diameter) {
152            scaledSrcBmp = Bitmap.createScaledBitmap(squareBitmap, diameter,
153                    diameter, true);
154
155        } else {
156            scaledSrcBmp = squareBitmap;
157        }
158        Bitmap output = Bitmap.createBitmap(scaledSrcBmp.getWidth(),
159                scaledSrcBmp.getHeight(), Config.ARGB_8888);
160        Canvas canvas = new Canvas(output);
161
162        Paint paint = new Paint();
163        Rect rect = new Rect(0, 0, scaledSrcBmp.getWidth(),
164                scaledSrcBmp.getHeight());
165
166        paint.setAntiAlias(true);
167        paint.setFilterBitmap(true);
168        paint.setDither(true);
169        canvas.drawARGB(0, 0, 0, 0);
170        canvas.drawCircle(scaledSrcBmp.getWidth() / 2,
171                scaledSrcBmp.getHeight() / 2, scaledSrcBmp.getWidth() / 2,
172                paint);
173        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
174        canvas.drawBitmap(scaledSrcBmp, rect, rect, paint);
175        // bitmap回收(recycle导致在布局文件XML看不到效果)
176        // bmp.recycle();
177        // squareBitmap.recycle();
178        // scaledSrcBmp.recycle();
179        bmp = null;
180        squareBitmap = null;
181        scaledSrcBmp = null;
182        return output;
183    }
184
185    /** * 边缘画圆 * * http://blog.csdn.net/qq_21376985 */
186    private void drawCircleBorder(Canvas canvas, int radius, int color) {
187        Paint paint = new Paint();
188        /* 去锯齿 */
189        paint.setAntiAlias(true);
190        paint.setFilterBitmap(true);
191        paint.setDither(true);
192        paint.setColor(color);
193        /* 设置paint的　style　为STROKE：空心 */
194        paint.setStyle(Paint.Style.STROKE);
195        /* 设置paint的外框宽度 */
196        paint.setStrokeWidth(mBorderThickness);
197        canvas.drawCircle(defaultWidth / 2, defaultHeight / 2, radius, paint);
198    }
199
200}

然后我们需要在布局中引用。下面是布局的一个引用，其实很简单，就和咱们
引用自定义View一模一样。由于它继承了ImageView。所以，方法大致相同。

1 <com.qq986945193.zoomimageviewrounddemo.RoundImageView
2        android:layout_width="100dp"
3        android:layout_height="100dp"
4        android:layout_centerInParent="true"
5        android:scaleType="fitCenter"
6        android:src="@drawable/img" />

当然还有，我们写了一个样式，所以需要在styles样式中添加：

1   <!-- 圆形ImageView -->
2    <declare-styleable name="RoundImageView">
3        <attr name="border_thickness" format="dimension" />
4        <attr name="border_inside_color" format="color" />
5        <attr name="border_outside_color" format="color" />
6    </declare-styleable>

OK,这样，圆形的的效果就能出来了，是不是很简单呢？当然，自定义View那一块想了解的可以深入。毕竟，你只会用，看不懂源代码也是不太好吧？是不是呢？
（Eclipse版本）源代码传送门：
http://download.csdn.net/detail/qq_21376985/9599249
（Android Studio版本）源代码传送门：
https://github.com/QQ986945193/DavidZoomImageViewRoundDemo