Some simple demos of Android apps. Please use Android Studio to open the project. You can read build.gradle to check the version of Android API.
This is an app that use AsyncTask to download a picture.
These are screenshots of the app.
When you first open the app.There is only a button at left top of the view.
When you click on the button,there is a dialog prompting you that a picture is being downloaded.
When you download the picture successfuly,there will be a picture blow the button.
