android圆形的ImageView

<a target=_blank href="http://blog.csdn.net/jjding1986/article/details/8141465" style="color: rgb(0, 0, 0); text-decoration: none; font-family: 'Microsoft YaHei'; font-size: 20px; line-height: 30px;">android圆形的ImageView</a>

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package com.example.testsam;import android.content.Context;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.util.AttributeSet;import android.widget.ImageView;/** * 圆形的Imageview * @since 2012-11-02 *  * @author bingyang.djj *  */public class CircleImageView extends ImageView {private Paint paint = new Paint();public CircleImageView(Context context) {super(context);}public CircleImageView(Context context, AttributeSet attrs) {super(context, attrs);}public CircleImageView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);}@Overrideprotected void onDraw(Canvas canvas) {Drawable drawable = getDrawable();if (null != drawable) {Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap();Bitmap b = toRoundCorner(bitmap, 14);final Rect rect = new Rect(0, 0, b.getWidth(), b.getHeight());paint.reset();canvas.drawBitmap(b, rect, rect, paint);} else {super.onDraw(canvas);}}private Bitmap toRoundCorner(Bitmap bitmap, int pixels) {Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),bitmap.getHeight(), Config.ARGB_8888);Canvas canvas = new Canvas(output);final int color = 0xff424242;final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());paint.setAntiAlias(true);canvas.drawARGB(0, 0, 0, 0);paint.setColor(color);int x = bitmap.getWidth();canvas.drawCircle(x / 2, x / 2, x / 2, paint);paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));canvas.drawBitmap(bitmap, rect, rect, paint);return output;}}