I occur a problem when develop a application on android. There have two image which can be download from server in a list item, it will show one image and will show another image when user select or click this item . if I try to download another image from server when user click it,the user will never have time to see it, for this time is shorter than download image form server, so i want to download two of them,and when I click it again,the app can invoke another image from local. but I do not know how to invoke this image ? Any suggestion will be appreciate. thx