自定义imageview圆形图片

 自定的类里面；

package com.example.rikao18;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Color;
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.util.AttributeSet;
import android.widget.ImageView;

public class Myimage extends ImageView{
    public Myimage(Context context) {  
        super(context);  
        // TODO Auto-generated constructor stub  
    }  
      
    public Myimage(Context context, AttributeSet attrs) {  
        super(context, attrs);  
    }  
      
    public Myimage(Context context, AttributeSet attrs, int defStyle) {  
        super(context, attrs, defStyle);  
    }  
      
    @Override  
    protected void onDraw(Canvas canvas) {  
      
        Drawable drawable = getDrawable();  
      
        if (drawable == null) {  
            return;  
        }  
      
        if (getWidth() == 0 || getHeight() == 0) {  
            return;   
        }  
          
        Bitmap b =  ((BitmapDrawable)drawable).getBitmap();  
          
        if(null == b)  
        {  
            return;  
        }  
          
        Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);  
      
        int w = getWidth(), h = getHeight();  
      
      
        Bitmap roundBitmap =  getCroppedBitmap(bitmap, w);  
        //canvas.drawColor(Color.BLUE);
        canvas.drawBitmap(roundBitmap, 0,0, null);  
    }
    
    public static Bitmap getCroppedBitmap(Bitmap bmp, int radius) {  
        Bitmap sbmp;  
        if(bmp.getWidth() != radius || bmp.getHeight() != radius)  
            sbmp = Bitmap.createScaledBitmap(bmp, radius, radius, false);  
        else  
            sbmp = bmp;  
        Bitmap output = Bitmap.createBitmap(sbmp.getWidth(),  
                sbmp.getHeight(), Config.ARGB_8888);  
        Canvas canvas = new Canvas(output);  
      
        final int color = 0xffa19774;  
        final Paint paint = new Paint();  
        final Rect rect = new Rect(0, 0, sbmp.getWidth(), sbmp.getHeight());  
      
        paint.setAntiAlias(true);  
        paint.setFilterBitmap(true);  
        paint.setDither(true);  
        canvas.drawARGB(0, 0, 0, 0);  
        paint.setColor(Color.parseColor("#BAB399"));  
        canvas.drawCircle(sbmp.getWidth() / 2+0.7f, sbmp.getHeight() / 2+0.7f,  
                sbmp.getWidth() / 2+0.1f, paint);  
        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));  
        canvas.drawBitmap(sbmp, rect, rect, paint);  
      
        return output;  
    }  
}

xml布局里面；

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    
<com.example.rikao18.Myimage
      android:id="@+id/right_login_head"  
            android:layout_width="match_parent"  
            android:layout_height="match_parent"            
            android:src="@drawable/b"
    
    />
</LinearLayout>