Android static variables are lost

Question

I am using a class with only static variables to store all constants and run-time properties. But, recently I have seen instances when I\'m referencing these variables, I ge

Answer 1

androidId is a reference to an string, string is a class that will get by default a null reference as intial value if you dont do it....

look at this taken from oracle's doc

So basically androidId is null because is not initialized....the fact that the variable is static or not is not relevant in this case...

see here for more details

...I SOMETIMES get null.

yes, you will get always null unless its value change at run time...