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Bitmap bitmap;

@Override
public void setImageBitmap(Bitmap bm) {
   bitmap= bm;
   if(isDetached){//防止异步回调时 设置bm，可能异步回来的时候imageview已经执行了onDetachedFromWindow
      if(bitmap!= null && !bitmap.isRecycled()){
         bitmap.recycle();
         bitmap= null;
         setImageBitmap(null);
      }
      return;
   }
   super.setImageBitmap(bm);
}

@Override
   protected void onDetachedFromWindow() {
      //imageview不再显示时 回收图片
      if(bitmap!= null && !bitmap.isRecycled()){
         bitmap.recycle();
         bitmap= null;
         setImageBitmap(null);
      }
      isDetached = true;
      super.onDetachedFromWindow();
   }

boolean isDetached=false;

@Override
protected void onAttachedToWindow() {
   super.onAttachedToWindow();
   isDetached = false;
}