Android实现圆形头像-使用自定义控件

Android圆形图片控件效果图如下:

Android实现圆形头像-使用自定义控件_第1张图片

代码如下:

RoundImageView.java

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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

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    <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

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<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"  
        >  

          
          
        <com.dxd.roundimageview.RoundImageView   
            android:layout_width="100dp"  
            android:layout_height="100dp"  
            android:src="@drawable/img"  
            />  
          
          
          
        <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。

转载自:
http://blog.csdn.net/android_dong/article/details/41989499

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