Creating a new Android project in Android Kotlin - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a new Android Activity class named MainActivity.

Android Kotlin

class MainActivity : [1]() {
  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)
  }
}

Drag options to blanks, or click blank then click option'

AFragmentActivity

BActivityMain

CAppCompatActivity

DViewModel

Attempts:

3 left

💡 Hint

Common Mistakes

Using ActivityMain instead of AppCompatActivity

Extending ViewModel which is not an Activity

Using FragmentActivity which is for fragments

The MainActivity class should extend AppCompatActivity to work properly as an Android activity.

2fill in blank

medium

Complete the code to set the layout resource for the activity in onCreate.

Android Kotlin

override fun onCreate(savedInstanceState: Bundle?) {
  super.onCreate(savedInstanceState)
  [1](R.layout.activity_main)
}

Drag options to blanks, or click blank then click option'

AsetContentView

Binflate

CsetLayout

DloadLayout

Attempts:

3 left

💡 Hint

Common Mistakes

Using inflate which is for view binding

Using setLayout or loadLayout which do not exist

The method setContentView sets the UI layout for the activity.

3fill in blank

hard

Fix the error in the import statement to use the correct Android package for Bundle.

Android Kotlin

import [1].os.Bundle

Drag options to blanks, or click blank then click option'

Aandroidx

Bandroid

Ckotlin

Djava

Attempts:

3 left

💡 Hint

Common Mistakes

Using androidx.os.Bundle which does not exist

Using kotlin.os.Bundle which is invalid

The correct package for Bundle is android.os.Bundle.

4fill in blank

hard

Fill both blanks to declare a new Android project package and main activity class header.

Android Kotlin

package [1]

class MainActivity : [2]()

Drag options to blanks, or click blank then click option'

Acom.example.myapp

BAppCompatActivity

Candroid.app

DMainActivity

Attempts:

3 left

💡 Hint

Common Mistakes

Using android.app as package name

Using MainActivity as a base class

The package name should be your app's unique identifier like com.example.myapp. The activity class should extend AppCompatActivity.

5fill in blank

hard

Fill all three blanks to complete the minimal MainActivity code with onCreate method and layout setting.

Android Kotlin

package [1]

import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity

class MainActivity : [2]() {
  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    [3](R.layout.activity_main)
  }
}

Drag options to blanks, or click blank then click option'

Acom.example.app

BAppCompatActivity

CsetContentView

Dandroid.app

Attempts:

3 left

💡 Hint

Common Mistakes

Using android.app as package name

Forgetting to extend AppCompatActivity

Using inflate instead of setContentView

The package name is usually your app's domain reversed like com.example.app. The activity extends AppCompatActivity. The layout is set with setContentView.