<fragment
    android:id="@+id/fragment"
    android:name="com.viator42.simplemarkdown.module.settings.PreferenceGeneralFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

public class PreferenceGeneralFragment extends PreferenceFragment implements Preference.OnPreferenceChangeListener {
    private RefAction refAction;

    public PreferenceGeneralFragment() {
    }

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.pref_settings_general);

        if (refAction == null) {
            refAction = new RefAction(getActivity());
        }

        String value;

        ListPreference themeSettingPreference = (ListPreference) findPreference(getResources().getString(R.string.theme_setting_key));
        themeSettingPreference.setOnPreferenceChangeListener(this);
        value = refAction.getSettings(getResources().getString(R.string.theme_setting_key));
        if(!CommonUtils.isStrEmpty(value)) {
            themeSettingPreference.setValue(value);
        }

        ListPreference displayModeSettingPreference = (ListPreference) findPreference(getResources().getString(R.string.display_mode_setting_key));
        displayModeSettingPreference.setOnPreferenceChangeListener(this);
        value = refAction.getSettings(getResources().getString(R.string.display_mode_setting_key));
        if(!CommonUtils.isStrEmpty(value)) {
            displayModeSettingPreference.setValue(value);
        }

        ListPreference fontsizeSettingPreference = (ListPreference) findPreference(getResources().getString(R.string.fontsize_setting_key));
        fontsizeSettingPreference.setOnPreferenceChangeListener(this);
        value = refAction.getSettings(getResources().getString(R.string.fontsize_setting_key));
        if(!CommonUtils.isStrEmpty(value)) {
            fontsizeSettingPreference.setValue(value);
        }


        HeadimgPreference headimgPreference = (HeadimgPreference) findPreference(getResources().getString(R.string.headimg_setting_key));
        headimgPreference.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
            @Override
            public boolean onPreferenceClick(Preference preference) {
                //选择头像
                return true;
            }
        });
        headimgPreference.setHeadimg(); //设置头像

    }

    @Override
    public boolean onPreferenceChange(Preference preference, Object newValue) {
        refAction.setSettings(preference.getKey(), newValue.toString());
        return true;
    }
}