Saving Data on Android

Reading and wri/ng files in Android
Android separates the available storage into two parts, 
internal
 and 
external
. These 
names reflect an earlier time when most devices offered built-in, non-volatile 
memory (internal storage) and/or a removable storage option like a Micro SD card 
(external storage). Nowadays, many devices partition the built-in, permanent storage 
into separate partitions, one for internal and one for external. It should be noted that 
external storage does not indicate or guarantee that the storage is removable.
There are a few functional differences between internal and external storage:
•
Availability
: Internal storage is always available. External storage, on the other 
hand, is not. Some devices will let you mount external storage using a USB 
connection or other option; this generally makes it removable.
•
Accessibility
: By default, files stored using the internal storage are only accessible 
by the app that stored them. Files stored on the external storage system are 
usually accessible by everything — however, you can make files private.
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