write two examples that given library to customize our phone
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Android Studio
Android Developers
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Android Developers
Android Studio
User guide
Create an Android library
An Android library is structurally the same as an Android app module. It can include everything needed to build an app, including source code, resource files, and an Android manifest. However, instead of compiling into an APK that runs on a device, an Android library compiles into an Android Archive (AAR) file that you can use as a dependency for an Android app module. Unlike JAR files, AAR files can contain Android resources and a manifest file, which allows you to bundle in shared resources like layouts and drawables in addition to Java classes and methods.
A library module is useful in the following situations:
When you're building multiple apps that use some of the same components, such as activities, services, or UI layouts.
When you're building an app that exists in multiple APK variations, such as a free and paid version and you need the same core components in both.
In either case, simply move the files you want to reuse into a library module then add the library as a dependency for each app module. This page teaches you how to do both.