SharedPreferences工具类，作为存储和获取data下相关文件工具类，对SharedPreferences进行封装，使其使用更简单。

    import java.lang.reflect.InvocationTargetException;        import java.lang.reflect.Method;        import java.util.Map;                import android.content.Context;        import android.content.SharedPreferences;                public class SPUtils        {            public SPUtils()            {                /* cannot be instantiated */                throw new UnsupportedOperationException("cannot be instantiated");            }                    /**            * 保存在手机里面的文件名            */            public static final String FILE_NAME = "share_data";                    /**            * 保存数据的方法，我们需要拿到保存数据的具体类型，然后根据类型调用不同的保存方法            *             * @param context            * @param key            * @param object            */            public static void put(Context context, String key, Object object)            {                        SharedPreferences sp = context.getSharedPreferences(FILE_NAME,                        Context.MODE_PRIVATE);                SharedPreferences.Editor editor = sp.edit();                        if (object instanceof String)                {                    editor.putString(key, (String) object);                } else if (object instanceof Integer)                {                    editor.putInt(key, (Integer) object);                } else if (object instanceof Boolean)                {                    editor.putBoolean(key, (Boolean) object);                } else if (object instanceof Float)                {                    editor.putFloat(key, (Float) object);                } else if (object instanceof Long)                {                    editor.putLong(key, (Long) object);                } else                {                    editor.putString(key, object.toString());                }                        SharedPreferencesCompat.apply(editor);            }                    /**            * 得到保存数据的方法，我们根据默认值得到保存的数据的具体类型，然后调用相对于的方法获取值            *             * @param context            * @param key            * @param defaultObject            * @return            */            public static Object get(Context context, String key, Object defaultObject)            {                SharedPreferences sp = context.getSharedPreferences(FILE_NAME,                        Context.MODE_PRIVATE);                        if (defaultObject instanceof String)                {                    return sp.getString(key, (String) defaultObject);                } else if (defaultObject instanceof Integer)                {                    return sp.getInt(key, (Integer) defaultObject);                } else if (defaultObject instanceof Boolean)                {                    return sp.getBoolean(key, (Boolean) defaultObject);                } else if (defaultObject instanceof Float)                {                    return sp.getFloat(key, (Float) defaultObject);                } else if (defaultObject instanceof Long)                {                    return sp.getLong(key, (Long) defaultObject);                }                        return null;            }                    /**            * 移除某个key值已经对应的值            *             * @param context            * @param key            */            public static void remove(Context context, String key)            {                SharedPreferences sp = context.getSharedPreferences(FILE_NAME,                        Context.MODE_PRIVATE);                SharedPreferences.Editor editor = sp.edit();                editor.remove(key);                SharedPreferencesCompat.apply(editor);            }                    /**            * 清除所有数据            *             * @param context            */            public static void clear(Context context)            {                SharedPreferences sp = context.getSharedPreferences(FILE_NAME,                        Context.MODE_PRIVATE);                SharedPreferences.Editor editor = sp.edit();                editor.clear();                SharedPreferencesCompat.apply(editor);            }                    /**            * 查询某个key是否已经存在            *             * @param context            * @param key            * @return            */            public static boolean contains(Context context, String key)            {                SharedPreferences sp = context.getSharedPreferences(FILE_NAME,                        Context.MODE_PRIVATE);                return sp.contains(key);            }                    /**            * 返回所有的键值对            *             * @param context            * @return            */            public static Map<String, ?> getAll(Context context)            {                SharedPreferences sp = context.getSharedPreferences(FILE_NAME,                        Context.MODE_PRIVATE);                return sp.getAll();            }                    /**            * 创建一个解决SharedPreferencesCompat.apply方法的一个兼容类            *             * @author zhy            *             */            private static class SharedPreferencesCompat            {                private static final Method sApplyMethod = findApplyMethod();                        /**                * 反射查找apply的方法                *                 * @return                */                @SuppressWarnings({ "unchecked", "rawtypes" })                private static Method findApplyMethod()                {                    try                    {                        Class clz = SharedPreferences.Editor.class;                        return clz.getMethod("apply");                    } catch (NoSuchMethodException e)                    {                    }                            return null;                }                        /**                * 如果找到则使用apply执行，否则使用commit                *                 * @param editor                */                public static void apply(SharedPreferences.Editor editor)                {                    try                    {                        if (sApplyMethod != null)                        {                            sApplyMethod.invoke(editor);                            return;                        }                    } catch (IllegalArgumentException e)                    {                    } catch (IllegalAccessException e)                    {                    } catch (InvocationTargetException e)                    {                    }                    editor.commit();                }            }                }