自定义view imageviw

新建一个类继承imageview

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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     }       @Override     protected void onDraw(Canvas canvas) {         // TODO Auto-generated method stub         Drawable 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);           else               p = 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;       }   }

　　在xml中一定要src而不是background