Android 中创建SharedPreferences工具类来保存状态，标志，数据等

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public class CacheUtils
{
private final static String SP_NAME = “xsy”;
private static SharedPreferences sp;

private static SharedPreferences getSp(Context context){    if (sp == null)    {        sp = context.getSharedPreferences(SP_NAME, Context.MODE_PRIVATE);    }    return sp;}/** * 获取boolean 数据 *  * @param context * @param key * @return 如果没有值，返回false */public static boolean getBoolean(Context context, String key){    SharedPreferences sp = getSp(context);    return sp.getBoolean(key, false);}/** * 获取boolean 数据 *  * @param context * @param key * @param defValue * @return */public static boolean getBoolean(Context context, String key, boolean defValue){    SharedPreferences sp = getSp(context);    return sp.getBoolean(key, defValue);}/** * 存boolean缓存 *  * @param context * @param key * @param value */public static void setBoolean(Context context, String key, boolean value){    SharedPreferences sp = getSp(context);    Editor editor = sp.edit();    editor.putBoolean(key, value);    editor.commit();}/** * 获取String 数据 *  * @param context * @param key * @return 如果没有值，返回null */public static String getString(Context context, String key){    SharedPreferences sp = getSp(context);    return sp.getString(key, null);}/** * 获取String 数据 *  * @param context * @param key * @param defValue * @return */public static String getString(Context context, String key, String defValue){    SharedPreferences sp = getSp(context);    return sp.getString(key, defValue);}/** * 存String缓存 *  * @param context * @param key * @param value */public static void setString(Context context, String key, String value){    SharedPreferences sp = getSp(context);    Editor editor = sp.edit();    editor.putString(key, value);    editor.commit();}/** * 获取int 数据 *  * @param context * @param key * @return 如果没有值，返回-1 */public static int getInt(Context context, String key){    SharedPreferences sp = getSp(context);    return sp.getInt(key, -1);}/** * 获取int 数据 *  * @param context * @param key * @param defValue * @return */public static int getInt(Context context, String key, int defValue){    SharedPreferences sp = getSp(context);    return sp.getInt(key, defValue);}/** * 存int缓存 *  * @param context * @param key * @param value */public static void setInt(Context context, String key, int value){    SharedPreferences sp = getSp(context);    Editor editor = sp.edit();    editor.putInt(key, value);    editor.commit();}

}

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