Android equivalent of NSUserDefaults in iOS

Question

I'd like to save some simple data. On the iPhone, I can do it with NSUserDefaults in Objective-C.

What is the similar command here in Android?

I'm just saving a few variables, to be reused as long as the application is installed. I don't want to use a complicated database just to do that.

Ariadne

Answer 1

This is the most simple solution I've found:

//--Init
int myvar = 12;


//--SAVE Data
SharedPreferences preferences = context.getSharedPreferences("MyPreferences", Context.MODE_PRIVATE);  
SharedPreferences.Editor editor = preferences.edit();
editor.putInt("var1", myvar);
editor.apply();


//--READ data       
myvar = preferences.getInt("var1", 0);  

Where 'context' is the current context (e.g. in an activity subclass could be this).

Ariadne

this is the way to go for storing very simple things, its simple and straight to the point – Chopping

I fixed the error in the code (was calling the non-existent getPreferences, not getSharedPreferences). – Houseless

Update 2015: Android recommends the use of apply() now over commit() because apply() operates on a background thread instead of storing the persistent data immediately and possible blocking the main thread. – Letitialetizia

Is there a way to access this SharedPreferences from jni code? – India

To get the 'context' from within AppCompatActivity, you can use getApplicationContext() – Ferraro

An Activity is your context. So use 'this' as context in Activities. In Fragments you'll want to use requireActivity(). – Diapositive