应用程序首选项(application preference)用来存储用户设置,考虑以下案例: a. 假设有一款MP3播放器程序,当用户调节了音量,当下次运行该程序时,可能希望保持上一次调节的音量值. b. 一款游戏的难易度设置. c. Twitter等社交程序的用户名和密码设置. iOS应用程序存储信息的方式很多,但主要有如下3种: 1. 单例类NSUserDefaults:NSUserDefaults类的工作原理类似于NSDirectionary,所有首选项都以键/值对的方式存储在NSUse
Aside from persistent files, your application might need to store cache data in a file. To do that, you would use GetCacheDir() along with a File object to open a file in the cache directory. Cache files are subject to removal by Android if the syste