First Android app in Android Kotlin - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the entry point of an Android app?

The entry point is the MainActivity class, which extends AppCompatActivity and contains the onCreate() method.

beginner

What does the setContentView() method do in an Android activity?

It sets the layout resource file that defines the UI for the activity, making the UI visible on the screen.

beginner

Which file defines the UI layout for the first Android app?

The UI layout is defined in an XML file located in res/layout/activity_main.xml.

intermediate

What is the purpose of the AndroidManifest.xml file?

It declares app components, permissions, and metadata. It tells Android which activity to start first.

beginner

How do you display a simple text message on the screen in your first Android app?

By adding a TextView element in the layout XML file with the desired text.

Which method is called when an Android activity starts?

A onCreate()

B onStart()

C onResume()

D onPause()

The onCreate() method is called first when the activity is created.

Where do you define the UI layout for an Android activity?

A In Kotlin code only

B In res/layout XML files

C In AndroidManifest.xml

D In build.gradle

UI layouts are defined in XML files inside the res/layout folder.

What does setContentView(R.layout.activity_main) do?

A Starts a new activity

B Declares app permissions

C Sets the UI layout for the current activity

D Stops the app

It sets the activity's UI to the layout defined in activity_main.xml.

Which file tells Android which activity to launch first?

A AndroidManifest.xml

B MainActivity.kt

C activity_main.xml

D strings.xml

AndroidManifest.xml declares the launcher activity.

What is the purpose of the TextView in Android?

A To display images

B To play audio

C To handle user input

D To display text

TextView is used to show text on the screen.

Explain the steps to create and display a simple 'Hello World' message in your first Android app.

Think about the activity lifecycle and UI layout files.

Describe the role of AndroidManifest.xml in launching your first Android app.

It acts like a map for Android to know what to start.