Building Android Widgets with Jetpack Compose Glance
Jetpack Compose Glance brings the declarative UI paradigm to Android widgets. If you build productivity or scheduler apps, modern widgets can showcase your app's data right on the user's home screen.
What Is Glance?
Glance is a Jetpack library that lets you build Android app widgets using a Compose-like syntax. Unlike traditional widgets built with RemoteViews and XML, Glance widgets use Kotlin composable functions. The framework handles the RemoteViews translation behind the scenes.
Why Use Glance for Widgets?
Traditional widget development with RemoteViews is verbose and limited. You can only use a subset of Android views, layouts are rigid, and styling is cumbersome. Glance simplifies all of this with composable functions, state management, and theming support.
Getting Started
Add the Glance dependencies to your build.gradle. Create a GlanceAppWidget subclass and define your widget's UI in the provideGlance or Content composable. Register the widget in your AndroidManifest.xml with an app widget provider.
Designing a Scheduler Widget
A scheduler widget could show the next three upcoming tasks with their scheduled times and app icons. Use a LazyColumn equivalent (Glance's list composable) to display each task. Make each item tappable to open the scheduler app at that task's detail screen.
State and Data
Glance widgets support state through GlanceStateDefinition. Use DataStore or SharedPreferences to persist widget data. Update the widget when the user adds or modifies scheduled tasks by calling GlanceAppWidgetManager.update().
Sizing and Responsiveness
Glance supports SizeMode for responsive layouts. Use SizeMode.Responsive to define different layouts for different widget sizes. A 2x1 widget might show only the next task, while a 4x2 widget shows a full mini-timeline.
Theming
Glance supports Material 3 dynamic color through GlanceTheme. Your widget automatically adapts to the user's wallpaper-based color scheme on Android 12 and later. This makes your widget feel native and consistent.
Limitations
Glance is still evolving. Not all Compose features are available. Animations are limited. Some complex layouts require workarounds. Check the latest release notes before starting a major widget project.
Conclusion
Jetpack Compose Glance modernizes Android widget development. For productivity and scheduler apps, a well-built widget is a key engagement feature. Users see their schedule without opening the app, which drives daily usage and retention.
Ready to automate your app schedule?
Download Appopener from the Google Play Store and start scheduling your apps today.