小白求问PreferenceFragment的一些相关问题，求解答

[qq_21894341]

public class SettingActivity extends Activity {
    // widget
    private SettingFragment settingFragment;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.activity_setting);
        if(savedInstanceState == null) {
            this.settingFragment = new SettingFragment();
            this.replaceFragment(R.id.setting_container, this.settingFragment);
        }
    }

    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    public void replaceFragment(int viewId, android.app.Fragment fragment) {
        FragmentManager fragmentManager = getFragmentManager();
        fragmentManager.beginTransaction().replace(viewId, fragment).commit();
    }

    // inner class
    public static class SettingFragment extends PreferenceFragment {
        // a place holder fragment containing a setting view
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            addPreferencesFromResource(R.xml.perference);
        }
    }
}

这是我的代码，但是在程序的其他地方无法取得值，可能是没有保存上

我想问：
1.android studio 如何打开sharedpreference
2.这些代码是不是存在问题，我看网上都说是自动保存的，难道一点监听器都不需要么？