Android圆形图片自定义控件

代码如下:
RoundImageView.java

package com.dxd.roundimageview; import android.content.Context; import android.content.res.TypedArray; import android.graphics.Bitmap; import android.graphics.Bitmap.Config; import android.graphics.Canvas; import android.graphics.Paint; import android.graphics.PorterDuff.Mode; import android.graphics.PorterDuffXfermode; import android.graphics.Rect; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.Drawable; import android.graphics.drawable.NinePatchDrawable; import android.util.AttributeSet; import android.util.Log; import android.widget.ImageView; import com.alan.myimageview.R; /**  * 圆形ImageView，可设置最多两个宽度不同且颜色不同的圆形边框。  * 设置颜色在xml布局文件中由自定义属性配置参数指定  */ public class RoundImageView extends ImageView {     private int mBorderThickness = 0;     private Context mContext;     private int defaultColor = 0xFFFFFFFF;     // 如果只有其中一个有值，则只画一个圆形边框     private int mBorderOutsideColor = 0;     private int mBorderInsideColor = 0;     // 控件默认长、宽     private int defaultWidth = 0;     private int defaultHeight = 0;     public RoundImageView(Context context) {         super(context);         mContext = context;     }     public RoundImageView(Context context, AttributeSet attrs) {         super(context, attrs);         mContext = context;         setCustomAttributes(attrs);     }     public RoundImageView(Context context, AttributeSet attrs, int defStyle) {         super(context, attrs, defStyle);         mContext = context;         setCustomAttributes(attrs);     }     private void setCustomAttributes(AttributeSet attrs) {         TypedArray a = mContext.obtainStyledAttributes(attrs,R.styleable.roundedimageview);         mBorderThickness = a.getDimensionPixelSize(R.styleable.roundedimageview_border_thickness, 0);         mBorderOutsideColor = a.getColor(R.styleable.roundedimageview_border_outside_color,defaultColor);         mBorderInsideColor = a.getColor(R.styleable.roundedimageview_border_inside_color, defaultColor);     }     @Override     protected void onDraw(Canvas canvas) {         Drawable drawable = getDrawable() ;          if (drawable == null) {             return;         }         if (getWidth() == 0 || getHeight() == 0) {             return;         }         this.measure(0, 0);         if (drawable.getClass() == NinePatchDrawable.class)             return;         Bitmap b = ((BitmapDrawable) drawable).getBitmap();         Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);         if (defaultWidth == 0) {             defaultWidth = getWidth();         }         if (defaultHeight == 0) {             defaultHeight = getHeight();         }         int radius = 0;         if (mBorderInsideColor != defaultColor && mBorderOutsideColor != defaultColor) {// 定义画两个边框，分别为外圆边框和内圆边框             radius = (defaultWidth < defaultHeight ? defaultWidth : defaultHeight) / 2 - 2 * mBorderThickness;             // 画内圆             drawCircleBorder(canvas, radius + mBorderThickness / 2,mBorderInsideColor);             // 画外圆             drawCircleBorder(canvas, radius + mBorderThickness + mBorderThickness / 2, mBorderOutsideColor);         } else if (mBorderInsideColor != defaultColor && mBorderOutsideColor == defaultColor) {// 定义画一个边框             radius = (defaultWidth < defaultHeight ? defaultWidth : defaultHeight) / 2 - mBorderThickness;             drawCircleBorder(canvas, radius + mBorderThickness / 2, mBorderInsideColor);         } else if (mBorderInsideColor == defaultColor && mBorderOutsideColor != defaultColor) {// 定义画一个边框             radius = (defaultWidth < defaultHeight ? defaultWidth : defaultHeight) / 2 - mBorderThickness;             drawCircleBorder(canvas, radius + mBorderThickness / 2, mBorderOutsideColor);         } else {// 没有边框             radius = (defaultWidth < defaultHeight ? defaultWidth : defaultHeight) / 2;         }         Bitmap roundBitmap = getCroppedRoundBitmap(bitmap, radius);         canvas.drawBitmap(roundBitmap, defaultWidth / 2 - radius, defaultHeight / 2 - radius, null);     }     /**      * 获取裁剪后的圆形图片      * @param radius半径      */     public Bitmap getCroppedRoundBitmap(Bitmap bmp, int radius) {         Bitmap scaledSrcBmp;         int diameter = radius * 2;         // 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         int bmpWidth = bmp.getWidth();         int bmpHeight = bmp.getHeight();         int squareWidth = 0, squareHeight = 0;         int x = 0, y = 0;         Bitmap squareBitmap;         if (bmpHeight > bmpWidth) {// 高大于宽             squareWidth = squareHeight = bmpWidth;             x = 0;             y = (bmpHeight - bmpWidth) / 2;             // 截取正方形图片             squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth, squareHeight);         } else if (bmpHeight < bmpWidth) {// 宽大于高             squareWidth = squareHeight = bmpHeight;             x = (bmpWidth - bmpHeight) / 2;             y = 0;             squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth,squareHeight);         } else {             squareBitmap = bmp;         }         if (squareBitmap.getWidth() != diameter || squareBitmap.getHeight() != diameter) {             scaledSrcBmp = Bitmap.createScaledBitmap(squareBitmap, diameter,diameter, true);         } else {             scaledSrcBmp = squareBitmap;         }         Bitmap output = Bitmap.createBitmap(scaledSrcBmp.getWidth(),                 scaledSrcBmp.getHeight(),                  Config.ARGB_8888);         Canvas canvas = new Canvas(output);         Paint paint = new Paint();         Rect rect = new Rect(0, 0, scaledSrcBmp.getWidth(),scaledSrcBmp.getHeight());         paint.setAntiAlias(true);         paint.setFilterBitmap(true);         paint.setDither(true);         canvas.drawARGB(0, 0, 0, 0);         canvas.drawCircle(scaledSrcBmp.getWidth() / 2,                 scaledSrcBmp.getHeight() / 2,                  scaledSrcBmp.getWidth() / 2,                 paint);         paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));         canvas.drawBitmap(scaledSrcBmp, rect, rect, paint);         bmp = null;         squareBitmap = null;         scaledSrcBmp = null;         return output;     }     /**      * 边缘画圆      */     private void drawCircleBorder(Canvas canvas, int radius, int color) {         Paint paint = new Paint();         /* 去锯齿 */         paint.setAntiAlias(true);         paint.setFilterBitmap(true);         paint.setDither(true);         paint.setColor(color);         /* 设置paint的　style　为STROKE：空心 */         paint.setStyle(Paint.Style.STROKE);         /* 设置paint的外框宽度 */         paint.setStrokeWidth(mBorderThickness);         canvas.drawCircle(defaultWidth / 2, defaultHeight / 2, radius, paint);     } }

1、定义自己的属性配置文件：attr.xml

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

2、在xml配置中使用控件：activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     xmlns:imagecontrol="http://schemas.android.com/apk/res-auto"     android:layout_width="fill_parent"     android:layout_height="fill_parent"     android:orientation="horizontal"     >     <!-- 没有指定圆形ImageView属性时，默认没有外边圆颜色 -->     <!-- 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-->     <com.dxd.roundimageview.RoundImageView          android:layout_width="100dp"         android:layout_height="100dp"         android:src="@drawable/img"         />     <!-- border_outside_color 外部圆圈的颜色 -->     <!-- border_inside_color 内部部圆圈的颜色 -->     <!-- border_thickness 外圆和内圆的宽度 -->     <com.dxd.roundimageview.RoundImageView          android:layout_width="100dp"         android:layout_height="100dp"         android:src="@drawable/img"         imagecontrol:border_inside_color="#bc0978"         imagecontrol:border_outside_color="#ba3456"         imagecontrol:border_thickness="1dp"         /> </LinearLayout>

3、主Activity中没有相关代码，直接加载布局文件即可。

来自：http://blog.csdn.net/android_dong/article/details/41989499