Android中Raw和Asset的区别

时间：2016年3月18日13:35:54

相同点：

    两个文件夹下的文件都不会被编译成二进制文件，都会被原封不动的放到apk中。

不同点：

1.     asset下的文件不会被映射到R文件中，raw下的文件会被映射到R文件中。
   
2.     因为raw文件可以映射到R文件中，所以可以使用R.raw.xxx的方法去引用资源。
3.     asset下可以有目录结构，raw下不能有目录结构。

• Since raw is a subfolder of Resources (res), Android will automatically generate an ID for any file located inside it. This ID is then stored an the R class that will act as a reference to a file, meaning it can be easily accessed from other Android classes and methods and even in Android XML files. Using the automatically generated ID is the fastest way to have access to a file in Android.

• The Assets folder is an “appendix” directory. The R class does not generate IDs for the files placed there, so its less compatible with some Android classes and methods. Also, it’s much slower to access a file inside it, since you will need to get a handle to it based on a String. However some operations are more easily done by placing files in this folder, like copying a database file to the system’s memory. There’s no (easy) way to create an Android XML reference to files inside the Assets folder.

  
  
  来源： http://stackoverflow.com/questions/9563373/the-reason-for-assets-and-raw-resources-in-android

来自为知笔记(Wiz)