圆形图片

//自定义控件

package com.zcp.map;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Path;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.widget.ImageView;

public class ImgView extends ImageView {

public ImgView(Context context, AttributeSet attrs) {
super(context, attrs);

}
@Override
protected void onDraw(Canvas canvas) {
Path clipPath = new Path();
int w = this.getWidth();
int h = this.getHeight();
clipPath.addRoundRect(new RectF(0, 0, w, h), 200.0f, 200.0f,
Path.Direction.CW);
canvas.clipPath(clipPath);
super.onDraw(canvas);
}

}

//布局文件

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >

<com.zcp.map.ImgView
android:id="@+id/img"
android:layout_width="200dp"
android:layout_height="200dp"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:scaleType="fitXY" />

</RelativeLayout>

//Activity

img=(ImgView)findViewById(R.id.img);
img.setImageResource(R.drawable.x);

圆形图片

原文：http://www.cnblogs.com/hnpy/p/5457234.html