RoundImageView圖片爲圓形

package com.example.administrator.jreduch06;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.PorterDuff;
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 RoundImageView extends ImageView {
   public RoundImageView(Context context) {
      super(context);
      // TODO Auto-generated constructor stub
   }

   public RoundImageView(Context context, AttributeSet attrs) {
      super(context, attrs);
      // TODO Auto-generated constructor stub
   }

   public RoundImageView(Context context, AttributeSet attrs, int defStyle) {
      super(context, attrs, defStyle);
      // TODO Auto-generated constructor stub
   }

   @Override
   protected void onDraw(Canvas canvas) {

      Drawable drawable = getDrawable();

      if (drawable == null) {
         return;
      }

      if (getWidth() == 0 || getHeight() == 0) {
         return;
      }

      Bitmap b = null;
      if(drawable instanceof BitmapDrawable){
         b = ((BitmapDrawable) drawable).getBitmap();
      }else if(drawable instanceof Drawable){
         b = Bitmap.createBitmap(   
                      getWidth(),   
                      getHeight(),   
                      drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
                      : Bitmap.Config.RGB_565);
                      Canvas canvas1 = new Canvas(b);   
                      // canvas.setBitmap(bitmap);   
                      drawable.setBounds(0, 0, getWidth(),   
                      getHeight());   
                      drawable.draw(canvas1);  
      }

      if (null == b) {
         return;
      }

      Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);
      int w = getWidth(), h = getHeight();

      Bitmap roundBitmap = getCroppedBitmap(bitmap, w);
      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(),
            Bitmap.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(PorterDuff.Mode.SRC_IN));
      canvas.drawBitmap(sbmp, rect, rect, paint);
      return output;
   }
}