首先，定义定义圆形Imageview类：

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

然后在别的布局文件中使用该控件即可，如：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:background="@drawable/side_right"    android:gravity="center"    android:orientation="vertical" >    <LinearLayout        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:gravity="center"        android:layout_marginTop="35dip"        android:orientation="vertical" >        <<span style="color:#ff0000;">com.founder.reader.view.RoundImageView</span>            android:id="@+id/right_login_head"            android:layout_width="60dip"            android:layout_height="60dip"            android:scaleType="centerInside"            android:src=http://www.mamicode.com/"@drawable/user" />