wireguard-android/app/src/main/java/com/wireguard/android/SettingsActivity.java

package com.wireguard.android;

import android.app.Activity;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.preference.PreferenceFragment;

public class SettingsActivity extends Activity {
    @Override
    protected void onCreate(final Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        final FragmentTransaction transaction = getFragmentManager().beginTransaction();
        transaction.replace(android.R.id.content, new SettingsFragment()).commit();
    }

    public static class SettingsFragment extends PreferenceFragment {
        @Override
        public void onCreate(final Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            addPreferencesFromResource(R.xml.preferences);
        }
    }
}