[android-developers] Global variable extend application class

So I am trying extend the base android.app.Application class and add member variables to create global variables like in this first solution of the link below.

Android global variable

This works if the member variable is a simple data type like a String. But how would you do it for a more complex data type? In my case i would like the member variable to be of type HashMap.

I am setting the member variable in onActivityResult(), and i am trying to access this member variable in the onClick() method of a button's onClickListener. When i access the String variable it's value is set appropriately. However when i access the HashMap variable its value is set to '{}', an empty HashMap.

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