extend the base android.app.Application class and add member variables like so:

public class MyApplication extends Application {
 
   private String someVariable;
 
   public String getSomeVariable() {
     return someVariable;
   }
 
   public void setSomeVariable(String someVariable) {
     this.someVariable = someVariable;
   }
 }
 

In your android manifest you must declare the class implementing android.app.Application:

<application android:name="MyApplication" android:icon="@drawable/icon" android:label="@string/app_name">
 

Then in your activities you can get and set the variable like so:

// set
 ((MyApplication) this.getApplication()).setSomeVariable("foo");
 
 // get
 String s = ((MyApplication) this.getApplication()).getSomeVariable();
 

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