IssueTracker

Component used: androidx.core:core-ktx

Version used: 1.15.0

Target SDK: 35

Devices/Android versions reproduced on: Pixel Tablet, Pixel Fold API 34. Not happening on API 33, not happening on API 35.

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We have a single-activity app in which we show different fragments, both inside a navcontroller as well as "on top". When a Video Player fragment comes into view, we use the windowInsetsController to hide the system UI and switch to a fullscreen view. When it disappears, we show the system UI again.

Ever since updating from core-ktx 1.13.1 to 1.15.0, the bottom navigation of our app "grows" when the System UI is shown again. It gets bottom padding when going fullscreen, but doesn't remove this bottom padding again when going non-fullscreen. This happens on Android 14 (API 34), not on API 33 and API 35.

This can easily be reproduced.

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Sample code to reproduce:

Layout:

<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="false"
    android:orientation="vertical">

    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/main_activity_bottom_nav"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:background="@color/teal_700"
        android:fitsSystemWindows="true"
        app:labelVisibilityMode="labeled"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:menu="@menu/main_menu" />
</androidx.constraintlayout.widget.ConstraintLayout>

Activity:

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
    }

    override fun onResume() {
        super.onResume()

        Handler(Looper.getMainLooper()).postDelayed({
            hideSystemUI(true)
        }, 2000L)

        Handler(Looper.getMainLooper()).postDelayed({
            hideSystemUI(false) // This triggers the bug
        }, 4000L)
    }

    public fun Activity.hideSystemUI(hide: Boolean) {
        val windowInsetsController = WindowCompat.getInsetsController(window, window.decorView)
        if (hide) {
            WindowCompat.setDecorFitsSystemWindows(window, false)
            windowInsetsController.systemBarsBehavior = BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE
            windowInsetsController.hide(WindowInsetsCompat.Type.systemBars() or WindowInsetsCompat.Type.displayCutout())
        } else {
            WindowCompat.setDecorFitsSystemWindows(window, true)
            windowInsetsController.systemBarsBehavior = BEHAVIOR_DEFAULT
            windowInsetsController.show(WindowInsetsCompat.Type.systemBars() or WindowInsetsCompat.Type.displayCutout())
        }
    }
}