PreferencesFragment

1. res\xml\prefs.xml

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

    <SwitchPreference
        android:defaultValue="false"
        android:key="lockApp"
        android:summary="@string/setting_fragment_lock_app_description"
        android:title="@string/setting_fragment_lock_app">

    </SwitchPreference>
</PreferenceScreen>

2. SettingFragment extends PreferenceFragment

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        addPreferencesFromResource(R.xml.prefs);
        SwitchPreference lockAppSetting = (SwitchPreference) findPreference("lockApp");
        lockAppSetting.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
            @Override
            public boolean onPreferenceChange(Preference preference, Object newValue) {
                Boolean isLock = Boolean.parseBoolean(String.valueOf(newValue));
                Bundle arguments = new Bundle();
                arguments.putBoolean("isLock", isLock);
                Fragment fragment = new LockPatternFragment();
                fragment.setArguments(arguments);
                mMainActivity.pushFragment(fragment);
                return true;
            }
        });
    }