Android simple data storage sharedpreferences

Sharedpreferences is a tool class for storing simple data in Android. As you can imagine, it is a small cookie. It stores simple data types (Boolean, Int, float, long, and string) in the application by using key-value pairs.ProgramIn the private directory (data/package name/shared_prefs/).

1) save data

 
//Get sharedpreferences object
Sharedpreferences settings =This. Getsharedpreferences ("shared_file", 0 );

//Get editable object
Sharedpreferences. Editor editor = settings. Edit ();

Editor. putstring ("name", "Kael Chen ");
Editor. putint ("Age", 22 );

Editor. Commit ();
 

2) read data

Sharedpreferences settings =This. Getsharedpreferences ("shared_file", 0 );
// The second parameter is assigned a default value if sharedpreferences are not saved.
String name = settings. getstring ("name", "No Name ");

IntAge = settings. getint ("Age", 0 );
 

 
3) delete data
 

 
//Get sharedpreferences object
Sharedpreferences settings =This. Getsharedpreferences ("shared_file", 0 );

//Get editable object
Sharedpreferences. Editor editor = settings. Edit ();
 

Editor. Remove ("name ");

// Editor. Clear ();

Editor. Commit ();

4) Corresponding shared_file.xml
 

 <?  XML version = '1. 0' encoding = 'utf-8' standalone = 'yes'  ?> 

 <  Map  > 

 <  String  Name  = "Name"  > Kael Chen </  String  > 

 <  Int  Name  = "Age"   /> 22 </  Int  > 

 </  Map  >