Android : Automatically open a preference pop-up in an Android app

I have a basic Android app with a set of Preference objects that can be edited through a Settings activity. One of these preferences is a URL to a certain page that has to be filled in by the user: it is required for the app to run and using a default value is impossible.

So I want to check if this preference is filled in and if not, redirect the user to the Settings activity and automatically open the TextEdit pop-up to edit this particular preference.

So far I have this in the main activity:

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_overview);

    SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(this);
    String thePreference = sharedPref.getString(SettingsActivity.KEY_THEPREFERENCE, "");
    if (thePreference.equals("")) {
        // The user didn't fill in the preference yet
    } else {
        // The user filled in the preference, we can continue normally
    }
}

I know I can create an Intent to start the settings activity:

Intent settingsIntent = new Intent(this, SettingsActivity.class);
startActivity(settingsIntent);

However, how can I let the pop-up for this preference open automatically?