Anddev.org. Home. Android Developers Blog. Highest Voted 'android' Questions. Application Fundamentals. Android apps are written in the Java programming language.
The Android SDK tools compile your code—along with any data and resource files—into an APK: an Android package, which is an archive file with an .apk suffix. One APK file contains all the contents of an Android app and is the file that Android-powered devices use to install the app. Once installed on a device, each Android app lives in its own security sandbox: The Android operating system is a multi-user Linux system in which each app is a different user. Programming Android (9781449389697): Zigurd Mednieks, Laird Dornin, G. Blake Meike, Masumi Nakamura. Series: Android Basics «