(Perfect implementation of QQ login pull down account switching, and use the Database database to save user information. There are user-defined database operation classes in the program, which can be copied from various projects that need databases. The drop-down box is implemented using PopupWindow. In addition, a user-defined BaseAdapter is included to copy the ListViewItem that can implement any interface. And the algorithm including login information verification is actually a small algorithm, just to show that the program is small and has all the five internal organs.)
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