自定义圆头像

//布局
<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="com.bwei.zidingyi_image.MainActivity">
<com.bwei.zidingyi_image.RoundImageView
android:id="@+id/right_login_head"
android:layout_width="60dip"
android:layout_height="60dip"
android:scaleType="centerInside"
android:src="@drawable/dd"></com.bwei.zidingyi_image.RoundImageView>
</RelativeLayout>

//自定义类
package com.example.zidingyi_image;
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, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public RoundImageView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public RoundImageView(Context context) {
super(context);
}
//重写OnDraw方法
@Override
protected void onDraw(Canvas canvas){
Drawable drawable=getDrawable();
if (drawable==null){
return;
}
if (getWidth()==0||getHeight()==0) {
return;
}
Bitmap bitmap=((BitmapDrawable) drawable).getBitmap();
if (bitmap==null){
return;
}
Bitmap bitmap1=bitmap.copy(Bitmap.Config.ARGB_8888, true);
int w=getWidth(),h=getHeight();
Bitmap roundbitmap= getCroppedBitmap(bitmap, w);
canvas.drawBitmap(roundbitmap, 0,0, null);
}
//返回的是一张图片
public static Bitmap getCroppedBitmap(Bitmap bmp, int radius){
//定义图片为空
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;
}
}

//主类（引用）
package com.example.zidingyi_image;
import android.app.Activity;
import android.os.Bundle;

public class MainActivity extends Activity{
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}