PreferenceManager getDefaultSharedPreferences deprecated in Android Q

Package preference provides the androidx PreferenceManager:

Java: implementation "androidx.preference:preference:1.1.1"

Kotlin: implementation "androidx.preference:preference-ktx:1.1.1"

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i.e. change android.preference.PreferenceManager to androidx.preference.PreferenceManager

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Also see PreferenceFragmentCompat, which is the current PreferenceFragment class to use.

You can use the Android 10 support library version of PreferenceManager, i.e., androidx.preference.PreferenceManager and not android.preference.PreferenceManager.

Remember to add the following to your build.gradle:

implementation 'androidx.preference:preference:1.1.1'