(This project is a small example of multithreaded downloading and using and prompting whether to install. Download apk from the Internet and store it in the specified directory of the mobile phone. The progress of download can be displayed in the notification bar. After the download is implemented, a dialog box will prompt the user whether to install. If not, it can be deleted. The project has a very specific Chinese directory. The project touches on knowledge: file stream, network download link protocol, read and write permissions, Handler, Notification Horse running lamp.)
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