Devices/Android versions reproduced on: Android 11 emulator and Samsung Galaxy S7 with Android 8.0
If a PreferenceFragmentCompat is e.g. used within a single-activity approach, it will apply the style PreferenceThemeOverlay in PreferenceFragmentCompat 's onCreate.
Unfortunately, PreferenceThemeOverlay sets a very generic attribute, which is not "removed" as soon as the PreferenceFragmentCompat is detached:
<item name="android:scrollbars">vertical</item>
This means that if the PreferenceThemeOverlay was once applied to the activity, it will force vertical scrollbars to show up on every view, which will feel addressed.
The current workarounds are:
Using an own activity for PreferenceFragmentCompat (but which is contradicting if you use the navigation component with a single activity approach.)
Re-applying the app's base theme back to the activity after PreferenceFragmentCompat has been detached and setting <item name="android:scrollbars">none</item>.
However, I think this behavior is unintended, since as soon as PreferenceFragmentCompat is once attached and created within the app's lifetime, it will set a very generic attribute that will affect other views as well. Therefore, I think this is a bug which has been introduced since 1.1.0-alpha02 (https://developer.android.com/jetpack/androidx/releases/preference#1.1.0-alpha02)
Basically, I would assume that PreferenceFragmentCompat should not change the activity's theme in a way that it overrides attributes that will affect other views as well.
Description
If a
PreferenceFragmentCompatis e.g. used within a single-activity approach, it will apply the stylePreferenceThemeOverlayinPreferenceFragmentCompat'sonCreate.Unfortunately,
PreferenceThemeOverlaysets a very generic attribute, which is not "removed" as soon as thePreferenceFragmentCompatis detached:<item name="android:scrollbars">vertical</item>This means that if the
PreferenceThemeOverlaywas once applied to the activity, it will force vertical scrollbars to show up on every view, which will feel addressed.The current workarounds are:
PreferenceFragmentCompat(but which is contradicting if you use the navigation component with a single activity approach.)PreferenceFragmentCompathas been detached and setting<item name="android:scrollbars">none</item>.However, I think this behavior is unintended, since as soon ashttps://developer.android.com/jetpack/androidx/releases/preference#1.1.0-alpha02 )
PreferenceFragmentCompatis once attached and created within the app's lifetime, it will set a very generic attribute that will affect other views as well. Therefore, I think this is a bug which has been introduced since1.1.0-alpha02(Basically, I would assume that
PreferenceFragmentCompatshould not change the activity's theme in a way that it overrides attributes that will affect other views as well.