SharedPreferences is a mechanism used to store some simple configuration information, use Map data structures to store data stored in key-value pairs, using the XML format to store data to the device. For example save the login user name and password. Only in the same package to use, can not be used between different packages, in fact, means that it can only create applications using other applications can not be used.

SharedPreferencesDemo01
.......................\.classpath
.......................\.project
.......................\.settings
.......................\.........\org.eclipse.jdt.core.prefs
.......................\AndroidManifest.xml
.......................\assets
.......................\gen
.......................\...\com
.......................\...\...\imooc
.......................\...\...\.....\sharedpreferencesdemo01
.......................\...\...\.....\.......................\BuildConfig.java
.......................\...\...\.....\.......................\R.java
.......................\libs
.......................\....\android-support-v4.jar
.......................\proguard-project.txt
.......................\project.properties
.......................\res
.......................\...\drawable-hdpi
.......................\...\.............\ic_launcher.png
.......................\...\drawable-ldpi
.......................\...\drawable-mdpi
.......................\...\.............\ic_launcher.png
.......................\...\drawable-xhdpi
.......................\...\..............\ic_launcher.png
.......................\...\layout
.......................\...\......\activity_main.xml
.......................\...\menu
.......................\...\....\main.xml
.......................\...\values
.......................\...\......\dimens.xml
.......................\...\......\strings.xml
.......................\...\......\styles.xml
.......................\...\values-sw600dp
.......................\...\..............\dimens.xml
.......................\...\values-sw720dp-land
.......................\...\...................\dimens.xml
.......................\src
.......................\...\com
.......................\...\...\imooc
.......................\...\...\.....\sharedpreferencesdemo01
.......................\...\...\.....\.......................\MainActivity.java

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