椭圆图片

package com.bwie.view;

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;

public class CircleImagerView extends ImageView {
private Paint p;

public CircleImagerView(Context context) {
super(context);
// TODO Auto-generated constructor stub
}

public CircleImagerView(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
p = new Paint();
}

public CircleImagerView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);

}

@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
Drawable drawable = getDrawable();
if(null!=drawable){
Bitmap bitmap = ((BitmapDrawable)drawable).getBitmap();
Bitmap b = getCircleBitmap(bitmap, 14);
final Rect rectSrc = new Rect(0, 0, b.getWidth(), b.getHeight());
final Rect rectDest = new Rect(0, 0, getWidth(), getHeight());
p.reset();
canvas.drawBitmap(b, rectSrc,rectDest, p);

}else{
super.onDraw(canvas);
}

}

private Bitmap getCircleBitmap(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());
p.setAntiAlias(true);
int x = bitmap.getWidth();
canvas.drawCircle(x/2, x/2, x/2, p);
p.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, p);
return output;
}

}

<com.bwie.view.CircleImagerView
android:id="@+id/img"
android:layout_width="200dp"
android:layout_height="200dp"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:src="@drawable/y5" />