Compose

Widgets live on the home screen. They show information at a glance — weather, tasks, calendar events, music controls. Users love them because they don’t have to open the app. Building widgets used to mean writing XML RemoteViews. It was painful. Jetpack Glance changed this. Glance lets you build widgets with a Compose-like API. In this tutorial, you will learn how to build widgets with Glance — from a simple text widget to a task list widget that loads data from Room. ...

Your app has a list of 10,000 items. Loading them all at once is a bad idea. The API call takes forever. The device runs out of memory. The UI freezes while Room queries thousands of rows. You need pagination — load 20 items at a time, and load more when the user scrolls near the bottom. You could build this manually. Track the current page. Handle loading and error states. Cache pages. Manage memory. Or you could use Paging 3, which does all of this for you. ...

Mobile development is hard. Cross-platform mobile development is harder. Kotlin Multiplatform sits in the middle — shared business logic with native UI on each platform. The Gradle configuration alone can take hours. Can Claude handle it? This is the most technically challenging project in the entire series. KMP has expect/actual declarations, platform-specific dependency injection, multiplatform Gradle config, and two completely different UI frameworks (Jetpack Compose for Android, SwiftUI for iOS). ...

In the previous tutorial, we built the shared data layer with Ktor, SQLDelight, and offline-first sync. The data layer works, but the UI is basic. You can only see a list of notes with a “+” button that creates placeholder notes. In this tutorial, we build a proper UI layer. You will add navigation between screens, a note editing screen with a color picker, pull-to-refresh sync, and loading and error states. All of this works on both Android (Compose) and iOS (SwiftUI). ...