![]() The values can be any valid data type : String. This module will be now store all of your SharedPreferences values. Therefore dataStore is null and the NullPointerException is thrown. Shared Preferences allow you to save and retrieve data in the form of key,value pair. rssreader import import android.os.Bundle import import import import public class SettingsFragment extends PreferenceFragment implements SharedPreferences. To put it simply, shared preference is a XML file that stores data as a combination of key value pairs. To migrate values from SharedPreferences you have to create you own preference module. public Flowable readLayoutFlow dataStore.data ().map (prefs -> prefs.get (RECYCLERVIEWLAYOUTKEY)) is evaluated before the constructors code is executed.
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