App signing in Flutter - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is app signing in mobile development?

App signing is the process of digitally signing your app to prove it comes from you. It ensures the app's integrity and identity before installation.

beginner

Why do you need a keystore in Flutter app signing?

A keystore holds your private key and certificate. It is used to sign your app so the app stores can verify your identity.

intermediate

What is the difference between debug and release signing in Flutter?

Debug signing uses a default debug key for testing. Release signing uses your own keystore to sign the app before publishing.

intermediate

What file do you create to configure signing in Flutter Android apps?

You create a key.properties file that stores keystore info, and update build.gradle to use it for signing.

advanced

What happens if you lose your keystore file for a published app?

You cannot update your app on the store anymore because the signature won't match. You must keep the keystore safe.

What is the main purpose of app signing?

A To verify the app's source and integrity

B To make the app run faster

C To reduce app size

D To change app colors

App signing proves the app is from the developer and has not been tampered with.

Which file typically stores your keystore credentials in Flutter Android projects?

A main.dart

B pubspec.yaml

C key.properties

D AndroidManifest.xml

The key.properties file holds keystore path and passwords for signing configuration.

What type of key is used for signing a Flutter app in release mode?

A Your own private key in a keystore

B Default debug key

C Random key generated at build time

D No key is used

Release builds use your private key stored in a keystore to sign the app.

What happens if you try to upload an app update signed with a different key than the original?

A The app crashes on launch

B The update installs normally

C The app size doubles

D The store rejects the update

App stores require the same signing key to verify updates come from the original developer.

Which command helps you generate a keystore for signing an Android app?

A flutter create keystore

B keytool -genkeypair -v -keystore my-release-key.keystore

C flutter build apk

D adb install keystore

The keytool command generates a new keystore file for signing.

Explain the steps to sign a Flutter Android app for release.

Think about creating keys, storing credentials, and telling the build system to use them.

Why is it important to keep your keystore file safe and backed up?

Consider what happens if you lose the key that proves the app is yours.