$2\mathrm{.}2$ Create a RatingBar UI for a hotel booking app that allows users to rate various aspects of their stay $($cleanliness$,$ comfort, service, etc.$).$ Display the average rating and individual ratings in the UI$.[15$ Marks$]$

$3\mathrm{.}1$ Write an Android activity in Java and xml that implements a login screen with EditText fields for the username and password, and a Button for the login action. Store multiple sets of valid usernames and passwords in an ArrayList. Implement logic to check if the entered credentials match any in the list and display a Toast message indicating success or failure. Use layout of your choice for the activity$\_$main. Kml$[25$ Marks$]$