package com.exaple.myselfview;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.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.View;
import android.widget.ImageView;public class MyView extends ImageView {public MyView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);// TODO Auto-generated constructor stub}public MyView(Context context) {super(context);// TODO Auto-generated constructor stub}public MyView(Context context, AttributeSet attrs) {super(context, attrs);// TODO Auto-generated constructor stub}@Overrideprotected void onDraw(Canvas canvas) {// TODO Auto-generated method stubDrawable 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);// //获取图片的宽 高int w = getWidth(), h = getHeight();// 通过getCroppedBitmap函数，返回一个圆形图片Bitmap roundBitmap = getCroppedBitmap(bitmap, w);// 在自定义的CircleImageEx上展现canvas.drawBitmap(roundBitmap, 0, 0, null);/* super.onDraw(canvas); */}public static Bitmap getCroppedBitmap(Bitmap bmp, int radius) {Bitmap p;// 判断图片的大小与传入radius是否相等，如果不相等，那么// 将图片设置成长 宽都是radius的图片if (bmp.getWidth() != radius || bmp.getHeight() != radius)p = Bitmap.createScaledBitmap(bmp, radius, radius, false);elsep = bmp;// 最后输出的图片信息Bitmap output = Bitmap.createBitmap(p.getWidth(),p.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, p.getWidth(), p.getHeight());// 画笔加上 抗锯齿标志，图像更加平滑paint.setAntiAlias(true);// 如果该项设置为true,则图像在动画进行中会滤掉对Bitmap图像的优化操作,加快显示paint.setFilterBitmap(true);// 防抖动paint.setDither(true);// 透明色canvas.drawARGB(0, 0, 0, 0);// 画笔的颜色paint.setColor(Color.parseColor("#BAB399"));// 画出一个圆形canvas.drawCircle(p.getWidth() / 2, p.getHeight() / 2,p.getWidth() / 2 + 0.1f, paint);// 设置两张图片相交时的模式 ，就是在画布上遮上圆形的图片信息paint.setXfermode(new PorterDuffXfermode(android.graphics.PorterDuff.Mode.SRC_IN));canvas.drawBitmap(p, rect, rect, paint);return output;}}