SwitchPreferenceCompat looking different when added to XML vs created programmatically [duplicate]

Question

In a PreferenceFragment, I have a SwitchPreferenceCompat added via XML:

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">

    <PreferenceCategory android:title="cat 1">

        <SwitchPreferenceCompat
            android:key="pref_1"
            android:defaultValue="false"
            android:title="from xml"/>

    </PreferenceCategory>

    <PreferenceCategory
        android:key="pref_cat_1"
        android:title="cat 2"/>

</PreferenceScreen>

and one added programmatically:

PreferenceGroup preferenceGroup = (PreferenceGroup) findPreference("pref_cat_1");

SwitchPreferenceCompat switchPreference = new SwitchPreferenceCompat(getActivity());
switchPreference.setWidgetLayoutResource(android.support.v7.preference.R.layout.preference_widget_switch_compat);
switchPreference.setTitle("programmatically");
switchPreference.setChecked(true);
switchPreference.setDefaultValue(true);

switchPreference.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
    @Override
    public boolean onPreferenceChange(final Preference preference, final Object newValue) {

        Toast.makeText(getActivity(), newValue.toString(), Toast.LENGTH_SHORT).show();

        return true;
    }
});

preferenceGroup.addPreference(switchPreference);

On the screen they look different (fontsize):

I tried omitting the line

switchPreference.setWidgetLayoutResource(android.support.v7.preference.R.layout.preference_widget_switch_compat);

but then the Switch button becomes invisible.

How can I make them look the same?

Test project can be found on Github (branch_two).

Pix

Do you actually wrap the SwitchPreferenceCompat in the PreferenceCategory just like the one above? – Pled

PreferenceScreen also has its compat brother, declare it in xml instead of original PreferenceScreen. – Mcbee

When I use Compat 25.2.0 they look exactly the same. – Pled

@GiovanniTerlingen Sorry, forgot to push my changes. If you checkout branch_two again, you will see the difference. – Pix

@Mcbee There is no PreferenceScreenCompat. – Pix

Yes, but there is android.support.v7.preference.PreferenceScreen – Mcbee

@Mcbee I see, sorry, yeah. But using that doesn't seem to solve my font size problem. Please mind, I updated the test project, actually using SwitchPreferenceCompat (had used SwitchPreference before). – Pix

I switched to CheckBoxPreference - it doesn't have this problem. – Sibling

This is a duplicate of the same problem of using the wrong context to create the new Preference. See this for the solution. – Sessions

Answer 1

When you inflate preferences from XML they use the preferenceTheme you specified in your app theme.

When you created the preference programmatically you used plain activity theme.

If you use the correctly themed Context it will work as expected:

new SwitchPreferenceCompat(getPreferenceManager().getContext());

Quicksilver