Sorry it was not clear.Please let me try to explain the second part in
a different way.

1) Start the application for the first time. Activity A is displayed
(it is the main Activity i.e. uses MAIN/LAUNCHER in the intent
filter). Activity A also uses singleTask launch mode.
2) User enters username and password. An asynchronous authentication
is started. When authetication completes I execute the following code
inside the authentication callback:

finish();
Intent intent = new Intent( this, ActivityB.class);
intent.setAction( Intent.ACTION_VIEW);
intent.setData( m_signedInUser.getContentUri());
startActivity( intent);

3) Now, Activity B is visible. BTW, Activity B uses the singleTop
launch mode.
4) User hits the Home button. Activity B is no longer visible.
5) The user clicks the app icon in the home screen. Activity A is
displayed.
        Note: As hackbod said earlier, Activity B should be displayed.
6) While Activity A is still visible hit the Back button. Activity B
is now visible.

Hope this is clearer. Thanks for helping out!


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