Saving Data on Android

External Storage
.
Using external storage
External storage is appropriate for user data that you want to make accessible to the 
user or other apps. Files saved on the external storage system are not deleted — even 
when the app is uninstalled. The external storage is made up of standard public 
directories. Files saved to the external storage are world-readable, by default, and 
can be modified by enabling mass storage and transferring the files to the computer 
via USB.
Saving Data on Android
Chapter 1: Using Files
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External storage is not guaranteed to be accessible at all times; sometimes it exists 
on a physically removable SD card. Before attempting to access a file in external 
storage, you must check for the availability of the external storage directories, as 
well as the files. You can also store files in a location on the external storage system, 
where they 
will be deleted
 by the system when the user uninstalls the app.
Now that you know a bit more about external storage possibilities, it’s time to 
modify the app to use external rather than internal storage. You’ll start by adding the 
necessary permissions to the manifest.