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Android—SDCard数据存取Environment简介

1:Environment简介:

Environment是android.os包下的一个类,谷歌官方文旦的解释为:Provides access to environment variables(提供访问环境的变量),由此可看出,该类是用于程序访问SDCard的一个设备访问类

Environment 常量 构造方法 方法如下:

Android—SDCard数据存取Environment简介images/loading.gif' 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解析:比如字段:DIRECTORY_PICTURES 是返回SDcard中Pictures目录的名字 其中的SDCardPicturesName==“Pictures”;

 

String SDCardPicturesName=Environment.DIRECTORY_PICTURES;


        比如构造方法:getExternalStorageDirectory();返回返回的主要外部存储目录。也就是SDCard的根目录了。如下图所示:

 

Android—SDCard数据存取Environment简介

        测试应用界面如下。不做解释,想比一看就能明白用意:

Android—SDCard数据存取Environment简介


补充:File类的四个构造方法:

File(File dir, String name);

File(String path) ;

File(String dirPath, String name;

File(URI uri);

 

 

 

 

 

 

 

 

 

 

 

 




原标题:Android—SDCard数据存取Environment简介

关键词:Android

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