Using Android Studios for mobile applications

Scenario: You recently started working as the mobile app developer for a University and have been assigned to build a mobile app that calculates the students' grade. Your app should contain following screens: Once your UI is defined, you need to create the logic to display the letter grade. You need to display the letter grade as soon as the user clicks the submit button in your app. Your app should calculate the logic as described below.

Screen 1

1. Labels for subject1, subject2, and subject3
2. Textboxes for subject1, subject2, and subject3
3. Labels for MaxGrade, MinGrade, and Avg.Grade
4. Submit button
5. Once user clicks submit button, you need to display letter grade in a label

Screen 2

1. Screen that allows students to register for the course
2. Once student register for the course, then the first screen should be updated dynamically with subjectnumber
3. Once the subject is added in screen 1, then your dynamic control needs to have same validations applied as screen 1.

You also need to have following validations in your mobile app.

1. Subject1, Subject2, Subject3 and any dynamic generated subjects values should be less than 100
2. Subject1, Subject2, Subject3 and any dynamic generated subjects are required fields
3. It is not possible to click submit button without entering Subject1, Subject2, Subject3 and any dynamic generated subjects.

I have loaded the second main.xml as this was the hardest part, the first screen is the exact same screen minus the grades. Then you hit submit. It should open to the second screen which is below but the courses update from the first screen and then, this one you input grade for each subject and submit which give the averages. My apologies as the length allowed doesn't allow me to give you everything I did already.

Update: I think the part that I am having the biggest issues. Is having the text edit turn into the text label on the next page. I have found lots of tutorials but am just having trouble.