判断当前ImageView设置的是哪张图片

1、在设置的时候设置一个TAG

ihmtb_add_iv.setImageResource(R.drawable.ic_main_add);
ihmtb_add_iv.setTag("" + R.drawable.ic_main_add);

2、在取的时候对Tag进行判断

//判断当前设置的图片是哪一张

Object tag = ihmtb_add_iv.getTag();  
if(tag != null){  
    String rTag = (String) tag;  
    // 判断类型  
    if(rTag.equals("" + R.drawable.ic_main_add)){  
        //TODO  
    } else if(rTag.equals("" + R.drawable.ic_menu_message_setting)){  
        //TODO  
    }  
}

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设置图片的方法：

1、iv.setImageResource(R.drawable.xxx);

2、mBackground.setBackground(getResources().getDrawable(R.drawable.xxx));

3、Drawable转Bitmap
Resources res = getResources();
Bitmap bitmap = BitmapFactory.decodeResource(res, R.drawable.xxx);
iv.setImageSrc(bitmap);  

4、
File uHeadFile = new File(ConstantUtil.UHEAD_URL + PrivateInfoActivity.uHeadName);
Bitmap bitmap = BitmapFactory.decodeFile(uHeadFile.toString());
iv.setImageSrc(bitmap); 

5、
File uHeadFile = new File(ConstantUtil.UHEAD_URL + PrivateInfoActivity.uHeadName);
Drawable drawable = Drawable.createFromPath(uHeadFile.toString());
mBackground.setBackground(drawable);