Lesson 1: Build your first app
This lesson teaches you how to set up Android Studio to use Kotlin and how to build apps. You start with "Hello World" and move up to an app that uses image files and a click handler. You learn how Android projects are structured, how to use and modify views in your Android Kotlin app, and how to make sure your apps are backward-compatible. You also learn about API levels and the Android Jetpack libraries.
Lesson 1 includes the following codelabs:
- 1.0 Install Android Studio
- 1.1 Get started
- 1.2 Basic app anatomy
- 1.3 Image resources and compatibility
- 1.4 Learn to help yourself
Lesson 2: Layouts
In this lesson, you learn how to use the Android Studio Layout Editor
to create linear layouts and constraint layouts. You create apps that
get and display user input, respond to user taps, and change the
visibility and color of views. This lesson also teaches you how to use
data binding to eliminate inefficient calls to
Lesson 2 includes the following codelabs:
- 2.1 Linear layout using the Layout Editor
- 2.2 Add user interactivity
- 2.3 Constraint layout using the Layout Editor
- 2.4 Data-binding basics
Lesson 3: Navigation
In this lesson, you learn how to create useful navigation in an app. You create a fragment and add it to an app, then add navigation to the app using the Android Studio navigation graph. You add a navigation drawer and an options menu to your app, and you work with the app's back stack, changing the destination of the system Back button. Finally, you learn how to invoke an external activity from within the app.
Lesson 3 includes the following codelabs:
Lesson 4: Activity and fragment lifecycles
In this lesson, you learn about the activity and fragment lifecycles, and you learn how to manage complex lifecycle situations. You work with a starter app that contains several bugs related to the Android lifecycle. You add logging to the app to better understand the app's lifecycle events, and you fix the bugs that the app contains and add some enhancements to the app. You also learn about Android Jetpack's lifecycle library, which can help you manage lifecycle events with code that's better organized and easier to maintain.
Lesson 4 includes the following codelabs:
Lesson 5: Architecture components
This lesson teaches you how to use
LiveData objects. You learn how to use
objects to enable data to survive configuration changes such as screen
rotations. You convert an app's UI data into encapsulated
LiveData and add observer methods that are notified when the value of the
You also integrate
ViewModel with data binding so that the views in your layout communicate directly with
objects, without using the app's fragments to relay information. This
technique simplifies your code and eliminates the need for click
handlers in the UI controllers.
Lesson 5 includes the following codelabs:
- 5.1 ViewModel and ViewModelProvider
- 5.2: LiveData and LiveData observers
- 5.3: DataBinding with ViewModel and LiveData
- 5.4: LiveData transformations
Lesson 6: Room database and coroutines
This lesson teaches you how to use the
Room database library.
takes care of many of the chores of setting up and configuring a
database, and simplifies the code for interacting with the database. You
learn how to use Kotlin coroutines to move database operations away
from the main thread, and you learn more about using
LiveData with app navigation.
Lesson 6 includes the following codelabs:
Lesson 7: RecyclerView
This lesson teaches you how to use a
RecyclerView to efficiently display lists and grids of items. For complex lists and grids, you learn ways to make
RecyclerView more efficient and your code easier to maintain and extend. You learn how to make items in a
RecyclerView clickable. You also learn how to add more than one view holder and layout to lists and grids in a
RecyclerView, for example, to add a header in your app.
Lesson 7 includes the following codelabs:
- 7.1 RecyclerView fundamentals
- 7.2 DiffUtil and data binding with RecyclerView
- 7.3 GridLayout with RecyclerView
- 7.4 Interacting with RecyclerView items
- 7.5 Headers in RecyclerView
Lesson 8: Connecting to the internet
This lesson teaches you how to use community-developed libraries to
connect to a web service to retrieve and display data. You learn how to
handle potential network errors and use the Glide library to load and
display photos from the internet. You also build a
RecyclerView and use it to display a grid of images.
Lesson 8 includes the following codelabs:
- 8.1 Getting data from the internet
- 8.2 Loading and displaying images from the internet
- 8.3 Filtering and detail views with internet data
Lesson 9: Repository
This lesson teaches you how to add a repository to abstract the data
layer and provide a clean API to the rest of your Android Kotlin app.
You also learn how to use
WorkManager to schedule background tasks in an efficient and optimized way.
Lesson 9 includes the following codelabs:
Lesson 10: Designing for everyone
This lesson teaches the basics of beautiful and accessible Android app design and guides you through building an app that finds and displays information about Google Developer Group (GDG) meetups.
Lesson 10 includes the following codelabs: