问题
I want to create a program that gets some images from a webpage, and shows them on a gridview. I dont know how many of them exactly. It could be from 20 to 30. Ill do it with asynctask, which i have allready used before and more or less know how it works. But i don't know which way use it this time.
For now, what i would like to get is a progressbar (circle clicking) while image is downloading. And once its downloaded, it would disappear and image will load. I will use an array of objects with an adapter, to fill the gridview.
Which way would you use the asynctask?
Thanks in advance.
回答1:
I would suggest you check out Lecture 6 of Harvard Extension CS76. There is a URLImageAdapter and example source code that does example what you are looking for.
Best of luck
回答2:
If you want to save downloaded images and reuse them in future then you must look DownloadManager
To display dialog with cycling circle, look this: howto use ProgressDialog
来源：https://stackoverflow.com/questions/6319478/android-download-images-from-web-and-show-them-on-gridview