How to declare global variables in Android?

Question

I am creating an application which requires login. I created the main and the login activity.

In the main activity onCreate method I added the following

Answer 1

You could create a class that extends Application class and then declare your variable as a field of that class and providing getter method for it.

public class MyApplication extends Application {
    private String str = "My String";

    synchronized public String getMyString {
        return str;
    }
}

And then to access that variable in your Activity, use this:

MyApplication application = (MyApplication) getApplication();
String myVar = application.getMyString();