Saving Data on Android

Reading from preferences
Reading from prefs is pretty straightforward. Once you get ahold of a preference file, 
you can use aptly named functions to read the variables of the data types mentioned 
earlier in this chapter. You can use functions such as 
getInt()
, 
getString()
 and 
getLong()
, passing in a key and an optional default value to get the stored value. An 
example call, to get a 
String
, by the key 
username
, with a default value of an empty 
String
 is as follows: 
preferences.getString("username", "")
.
You will learn more about reading data through the chapter's project, but for now, 
let's see how to write some data to 
SharedPreferences
.
Saving Data on Android
Chapter 2: Shared Preferences
raywenderlich.com
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