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Use the size of the app window—not a phone or tablet label—to choose a Jetpack Compose layout. Read the current window size class at a high-level composable, derive a small set of layout decisions, and pass those decisions to the screens and components that need them. The class can change when a window is resized, split-screen is used, or a foldable changes state, so your UI must respond to current state.
What WindowSizeClass tells you
A window size class categorizes the area available to your app. It is not a device-type detector: the same device can provide different window sizes in split-screen or desktop windowing, while different devices can provide similar app windows. Android defines width and height classes independently, so a window has one class on each axis at a given time. Width often drives the main layout choice, but height can matter—for example, a short landscape window may not have enough room for two useful panes.
The width ranges are:
| Width class | Available width |
|---|---|
| Compact | Below 600 dp |
| Medium | 600 dp to below 840 dp |
| Expanded | 840 dp to below 1,200 dp |
| Large | 1,200 dp to below 1,600 dp |
| Extra-large | 1,600 dp and above |
Height classes are compact below 480 dp, medium from 480 dp to below 900 dp, and expanded at 900 dp and above. These are framework conventions, not instructions to change your layout at every boundary. Choose a transition based on the minimum space your content needs. See Android’s window size class ranges.
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Use the current Compose adaptive API
For current Compose Material 3 Adaptive APIs, retrieve the class with currentWindowAdaptiveInfoV2() and read its windowSizeClass property:
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@Composable
fun MyApp() {
val windowSizeClass = currentWindowAdaptiveInfoV2().windowSizeClass
MyScreen(windowSizeClass = windowSizeClass)
}The V2 API was added in Compose Material 3 Adaptive 1.3.0 and supports large and extra-large width classes by default. The older currentWindowAdaptiveInfo() API was added in 1.2.0 and deprecated in 1.3.0; its reference directs developers to V2 for support of those wider classes. Check the V2 API reference, the older API reference, and the Compose window size class guide against the library version compatible with your project. The release page’s 1.4.0-alpha02 example is prerelease, not a stable-version recommendation.
Verify the imports and dependency for your selected version; API availability depends on the Compose Material 3 Adaptive library version.
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Choose a layout from content needs
There is no universal breakpoint that says every app should switch to two panes at the same width. Decide how much room each part of your content needs, then map the available class to a layout that remains useful.
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- For a second pane, confirm both panes retain a useful minimum width.
- For navigation, decide when a rail or persistent navigation improves access without crowding content.
- Consider height as well as width; a compact-height window may make a multi-pane layout impractical.
- Keep individual components flexible within a class. A class-based layout choice does not replace responsive sizing.
Android recommends localizing display-size handling and passing the class—or a derived state—down to nested composables. This keeps size policy in one visible place instead of scattering numeric comparisons across unrelated components. See Android’s guidance for supporting different display sizes.
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Centralize the decision and pass it down
- Set the content requirement. Identify when a second pane, navigation rail, or broader navigation pattern becomes useful for your content.
- Read the current class near the app boundary. Use
currentWindowAdaptiveInfoV2()in a high-level composable. - Derive explicit layout state. For example, determine whether to show a navigation rail or how many panes to display.
- Pass the choice to child composables. Give screens and components an explicit class or layout-state input rather than having each one invent its own breakpoint.
- Recompute as the window changes. Resizing, rotation, multi-window use, and folding or unfolding can change the available space while the app runs.
For guidance on using the app’s allocated window area in larger app-level composables, see Support different display sizes.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Test ranges, transitions, and short windows
Do not validate an adaptive layout only on one phone and one tablet. Exercise the window sizes your app supports, especially near the points where the layout changes. Testing each class once may miss problems that occur at intermediate widths.
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- Try compact, medium, and expanded widths, including the transition points relevant to your layout.
- Test compact-height windows, such as a medium-width landscape window, if your UI can run in them.
- Exercise split-screen and resizable windows when those modes are in scope.
- For foldable support, test folding and unfolding and confirm the layout updates to the available app window. Android’s fold-aware app guidance covers that behavior.
- Watch for clipped content, awkward transitions, lost state, and panes that become too narrow to use.
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