Android圆形图片--ImageView

【 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。