Android - APK (Application package)

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In build.gradle, applicationId is the fully qualified package name for your application that you specified during the New Project workflow.


All APKs (.apk files) must be signed with a certificate whose private key is held by their developer. This certificate identifies the author of the application. The certificate does not need to be signed by a certificate authority; it is perfectly allowable, and typical, for Android applications to use self-signed certificates. The purpose of certificates in Android is to distinguish application authors.

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Android Debug Bridge (adb) is a command line tool that communicate with: an emulator instance or connected Android-powered device. When building...
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Android - Build (Gradle) / Run the app

Gradle is the build system that packages up and compiles Android Apps. Android Studio automatically generates Gradle files for your application, including: the build.gradle for your app and module ...
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Android - aapt

aapt is a packaging tool that pack all classes and resources to apk file.

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