(Android applications use Java as the development language. The AAPT tool packages the compiled Java code together with the data and resource files required by other applications into an Android package file. This file uses Apk extensions, which are distributed applications and
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To install to mobile device media, users simply download this file and install it on their device. Single All code in the APK file is treated as an application.
In many ways, every Android App exists in its own world:)