Simple learning experience: NetEase Cloud classroom Android Development Fifth Chapter sharedpreferences and file Management

First, sharedpreferences

(1) sharedpreferences can be used to save some data that belongs to the basic data type.

(2) Save the data, delete the data are responsible for the internal interface editor of Sharedpreferences.

(3) The data saved in this way is in an XML file under the Root->data-> Package name->shared-prefs folder.

Ii. Document Management

(1) How to create files: New file (...) And Openfileoutput, through the new File (...) The way to create the file, you also need to call CreateNewFile ().

(2) Use Environment.getexternalstoragestate () to check the state of the external storage.

(3) Read files in different directories: Assets with Getresources (). Getassets (). Open (...), Raw with getresources (). Openrawresource (R.raw ...), SD card with Environment.getexternalstoragedirectory (). GetAbsolutePath () and so on.

Simple learning experience: NetEase Cloud classroom Android Development Fifth Chapter sharedpreferences and file Management