XStrings.java

/*
 Copyright 2012-2013, Polyvi Inc. (http://polyvi.github.io/openxface)
 This program is distributed under the terms of the GNU General Public License.

 This file is part of xFace.

 xFace is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

 xFace is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with xFace.  If not, see <http://www.gnu.org/licenses/>.
*/

package com.polyvi.xface.util;

import java.io.IOException;
import java.util.HashMap;

import org.xmlpull.v1.XmlPullParserException;

import android.content.Context;
import android.content.res.XmlResourceParser;

/**
 * 该类主要是从xml文件中读取所有的字符串常量保存下来
 */
public class XStrings {

    public static String EXIT_MESSAGE_TITLE = "exit_message_title";

    public static String EXIT_MESSAGE_CONTENT = "exit_message_content";

    public static String CONFIRM = "confirm";

    public static String APP_CONFIG_ERROR = "app_config_error";

    public static String ENTRY_NOT_FOUND = "entry_not_found";

    private static String TAG_RESOURCES = "resources";

    private static String XML_NAME = "xface_string";

    private static String XML_DIRECTORY = "xml";

    private static XStrings instance = null;

    private HashMap<String, String> mStringPreferences;

    public static XStrings getInstance() {
        if (null == instance) {
            instance = new XStrings();
        }
        return instance;
    }

    /**
     * 读取平台定义的字符串常量存储下来
     *
     * @param context
     */
    public void loadPlatformStrings(Context context) {
        mStringPreferences = new HashMap<String, String>();
        try {
            int id = context.getResources().getIdentifier(XML_NAME,
                    XML_DIRECTORY, context.getPackageName());
            XmlResourceParser xml = context.getResources().getXml(id);
            int eventType = -1;
            String key = null;
            while (eventType != XmlResourceParser.END_DOCUMENT
                    && !TAG_RESOURCES.equals(xml.getName())) {
                eventType = xml.next();
            }
            while (isLoadFinished(xml, eventType)) {
                if (eventType == XmlResourceParser.TEXT) {
                    String text = xml.getText();
                    mStringPreferences.put(key, text);
                }
                if (eventType == XmlResourceParser.START_TAG) {
                    if (0 != xml.getAttributeCount()) {
                        key = xml.getAttributeValue(0);
                    }
                }
                eventType = xml.next();
            }
        } catch (XmlPullParserException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 判断是否到达xml文件的结尾或者遇到resources的结束标签
     *
     * @param xml
     * @param eventType
     * @return
     */
    private boolean isLoadFinished(XmlResourceParser xml, int eventType) {
        return eventType != XmlResourceParser.END_DOCUMENT
                && !(eventType == XmlResourceParser.END_TAG && TAG_RESOURCES
                        .equals(xml.getName()));
    }

    /**
     * 获取字符村常量的值
     *
     * @param key关键字
     * @return 字符串常量的值
     */
    public String getString(String key) {
        return mStringPreferences.get(key);

    }

}