Signing configuration in Android Kotlin - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a signing configuration in Android app development?

A signing configuration is a set of information including a keystore file, key alias, and passwords used to digitally sign an Android app. This ensures the app's authenticity and integrity.

beginner

Why do Android apps need to be signed before installation?

Android requires apps to be signed to verify the developer's identity and to ensure the app has not been tampered with. Unsigned apps cannot be installed on devices.

intermediate

What is the difference between debug and release signing configurations?

Debug signing uses a default debug keystore provided by the Android SDK for testing. Release signing uses a private keystore created by the developer to sign the app for production release.

intermediate

How do you specify a signing configuration in the Gradle build file?

In the build.gradle file, inside the android block, you define signingConfigs with keystoreFile, keyAlias, storePassword, and keyPassword. Then you assign the signingConfig to buildTypes like release.

beginner

What is a keystore file and why is it important?

A keystore file is a binary file that stores private keys and certificates used to sign Android apps. It is important because it protects your signing keys and ensures only you can sign your app.

What does the signing configuration NOT include?

A Keystore file path

B App version number

C Key alias

D Passwords for keystore and key

The app version number is part of the app's metadata, not the signing configuration.

Which signing configuration is used during app development for quick testing?

A None

B Release signing

C Production signing

D Debug signing

Debug signing uses a default debug keystore for quick testing during development.

Where do you define signing configurations in an Android project?

A build.gradle (Module)

B AndroidManifest.xml

C settings.gradle

D res/values/strings.xml

Signing configurations are defined in the module-level build.gradle file inside the android block.

What happens if you try to install an unsigned APK on an Android device?

A It installs normally

B It shows a warning but installs

C Installation fails

D Device restarts

Android devices require apps to be signed; unsigned APKs cannot be installed.

Which of these is NOT a recommended practice for signing your release APK?

A Share your keystore file publicly

B Use a strong password for your keystore

C Backup your keystore safely

D Keep your keystore file secure

Sharing your keystore publicly risks your app's security and is not recommended.

Explain the purpose of signing configurations in Android app development.

Think about why Android requires apps to be signed before installation.

Describe how to set up a release signing configuration in the Gradle build file.

Focus on the keys and passwords needed and where to place them.