Store application global data

Here is the following code which I use to store String in Application Context.

I make the class GlobalVariable.java

import android.app.Application;

public class GlobalVariable extends Application 
{
      private String myState;

      public String getState()
      {
        return myState;
      }//End method

      public void setState(String s)
      {
        myState = s;
      }//End method
}//End Class

In .Manifest I add the following code

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

Where I want to set the value of string I use the following code

GlobalVariable appState = ((GlobalVariable)getApplicationContext());
appState.setState("Testing");

& where I want to Retrive the data I use

GlobalVariable appState = ((GlobalVariable)getApplicationContext());
appState.getState();