Android 自定义圆形头像

CircleImageView类 :

public class CircleImageView extends ImageView {

Path path;
public PaintFlagsDrawFilter mPaintFlagsDrawFilter;// 毛边过滤
Paint paint;
public CircleImageView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
// TODO Auto-generated constructor stub
init();
}

public CircleImageView(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
init();
}

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

public void init() {
paint = new Paint();
}

@Override
protected void onDraw(Canvas cns) {
// TODO Auto-generated method stub
Drawable drawable = getDrawable();
if (null != drawable) {
Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap();
Bitmap b = circleDraw(bitmap);
final Rect rect1 = new Rect(0, 0, b.getWidth(), b.getHeight());
final Rect rect2 = new Rect(0, 0, getMeasuredWidth(), getMeasuredHeight());
paint.reset();
cns.drawBitmap(b, rect1, rect2, paint);
b.recycle();
} else {
super.onDraw(cns);
}
}

private Bitmap circleDraw(Bitmap bitmap) {
int r=0;
int width = bitmap.getWidth();
int height = bitmap.getHeight();
Rect rectSource = null;
if(width>height)
r=height;
else
{
r=width;
}
//创建一个图片对象
Bitmap output = Bitmap.createBitmap(r, r, Bitmap.Config.ARGB_8888);
//创建一个图片游标
Canvas canvas = new Canvas(output);
final Rect rect = new Rect(0, 0, r, r);
/* 设置取消锯齿效果 */
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(Color.WHITE);
/* 绘画一个圆图形 */
canvas.drawCircle(r/ 2, r / 2, r / 2, paint);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
return output;
}
}