Using Shared Preferences in Android

Question

I have three activities, A, B & C. Where A is a splash Activity and B Contains Login screen which consist of user Id and Password Text Field and one button to login. When I

Answer 1

Write it from Activity A like this:

SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
            Editor editor = sp.edit();
            editor.putString("YOUR_KEY", "username");
            editor.commit();

You can read it afterwards with:

SharedPreferences p = PreferenceManager.getDefaultSharedPreferences(this);
        String username = p.getString("YOUR_KEY", null);