How to manage dividers in a PreferenceFragment?

Question

I started dealing with preferences in a PreferenceFragment. Here\'s what I have:

Answer 1

I had this exact problem and wanted dividers between preference categories but not between the items themselves. I found that the accepted solution satisfied Question 1 by removing the dividers from preference items but did not fix question 2 and add the dividers between preference categories.

Fix below. Basically override the onCreateAdapter method of your PreferenceFragmentCompat and give it a custom PreferenceGroupAdapter that has an overridden onBindViewHolder method that uses the position and whatever else you need to set above and below permissions for each view holder. A divider will be drawn when both viewholders allow a divider between them.

Here is my fix

public class SettingsFragment extends PreferenceFragmentCompat {

    @Override
    protected RecyclerView.Adapter onCreateAdapter(PreferenceScreen preferenceScreen) {
        return new CustomPreferenceGroupAdapter(preferenceScreen);
    }

    static class CustomPreferenceGroupAdapter extends PreferenceGroupAdapter {

    @SuppressLint("RestrictedApi")
    public CustomPreferenceGroupAdapter(PreferenceGroup preferenceGroup) {
        super(preferenceGroup);
    }

    @SuppressLint("RestrictedApi")
    @Override
    public void onBindViewHolder(PreferenceViewHolder holder, int position) {
        super.onBindViewHolder(holder, position);
        Preference currentPreference = getItem(position);
        //For a preference category we want the divider shown above.
        if(position != 0 && currentPreference instanceof PreferenceCategory) {
            holder.setDividerAllowedAbove(true);
            holder.setDividerAllowedBelow(false);
        } else {
            //For other dividers we do not want to show divider above 
            //but allow dividers below for CategoryPreference dividers.
            holder.setDividerAllowedAbove(false);
            holder.setDividerAllowedBelow(true);
        }
    }
}