Build variants (debug, release) in Android Kotlin - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a build variant in Android development?

A build variant is a combination of a build type and a product flavor that defines how the app is built and packaged. It lets you create different versions of your app, like debug and release.

beginner

What is the main difference between debug and release build types?

The debug build is for testing and includes debugging tools and logs. The release build is optimized, signed, and ready for publishing to users.

intermediate

Why do we use signingConfigs in the release build?

Signing configs provide the digital signature needed to verify the app's identity when publishing. Release builds must be signed to be accepted by app stores.

intermediate

How can you customize the app behavior for debug and release builds?

You can use BuildConfig.DEBUG in code to check if the app is running a debug build and change behavior like enabling logs or test features.

beginner

What Gradle file section defines build types like debug and release?

The android { buildTypes { ... } } block in the build.gradle file defines build types and their settings.

Which build variant is typically used for testing with debugging tools enabled?

A debug

B release

C production

D staging

The debug build variant includes debugging tools and is used for testing.

What must a release build have to be accepted by the Google Play Store?

A Debug logs enabled

B Unoptimized code

C Extra test code

D Signed with a release key

Release builds must be signed with a release key to verify the app's identity.

Where do you define build types like debug and release in an Android project?

A build.gradle (Module)

B settings.gradle

C AndroidManifest.xml

D proguard-rules.pro

Build types are defined in the module-level build.gradle file inside the android block.

Which code snippet checks if the app is running a debug build?

A BuildType.RELEASE

B BuildVariant.DEBUG

C BuildConfig.DEBUG

D BuildConfig.RELEASE

BuildConfig.DEBUG is a boolean that is true for debug builds.

What is a common use of the debug build variant?

A Publishing to app stores

B Testing and debugging

C Optimizing performance

D Signing with release keys

Debug builds are used for testing and debugging during development.

Explain the purpose of build variants in Android and how debug and release builds differ.

Think about why you need different versions of your app during development and publishing.

Describe how you can customize app behavior based on the build variant in Kotlin code.

Consider how your app might behave differently when testing versus when users install it.