Android developers have been told to support tablets, foldables, desktop windows, and strange aspect ratios for years. It was easy to treat that as optional polish when the phone layout still worked for most users. Android 17 makes the platform’s direction much harder to ignore: adaptive behaviour is becoming the default expectation.
Google describes Android 17 as an adaptive-first release, with mandatory large-screen resizability and more than 580 million large-screen Android devices already in use. That matters because the old assumptions are increasingly unreliable. An app can be resized, moved between displays, folded, unfolded, or run inside a desktop-style environment without being restarted in the neat phone shape its designer expected.
The fix is not a separate tablet app. It is treating window size as live input, using adaptive navigation and panes, and testing state preservation while the available space changes. Compose makes much of that easier, but it cannot decide which content should remain visible or how a workflow should reorganise itself. That is still product and engineering work.
I think this is overdue. Fixed-orientation phone layouts were always a shortcut, and the number of devices exposing that shortcut is growing. Teams targeting Android 17 should put resize and large-screen checks on the normal release path now, not wait for a bad store review from the one person who opened the app on a foldable.