How to manage dividers in a PreferenceFragment?

Although a bit late I`m having same troubles with dividers in preff screen and found this solution: Set custom style to the hosting activity and add to the style:

   <item name="android:listDivider">@null</item>

It actually does the same as setting it trough code but you save one findById and i think it looks clearer set trough styles

AndroidX makes it simple, but I wish it was better documented.

In XML

To add/remove dividers between preferences in XML, use the following attributes:

<androidx.preference.PreferenceScreen
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <Preference
        ...
        app:allowDividerAbove="true/false"
        app:allowDividerBelow="true/false"
        ... />

</androidx.preference.PreferenceScreen>

Note, a divider will only be shown between two preferences if the top divider has allowDividerBelow set to true and the bottom divider has allowDividerAbove set to true.

In Code

You can also change/remove dividers programmatically using the following methods in onActivityCreated of your PreferenceFragmentCompat:

@Override
public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);

    // To remove:
    setDivider(null);

    // To change:
    setDivider(ContextCompat.getDrawable(getActivity(), R.drawable.your_drawable));
    setDividerHeight(your_height);
}

Add this code under the PreferenceFragment :

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        // remove dividers
        View rootView = getView();
        ListView list = (ListView) rootView.findViewById(android.R.id.list);
        list.setDivider(null);

    }