Create a person counter. The UI should have a + button, and a - button as well as a textview to store the value of the current number. When the app launches, the counter will be at zero. When the + button is pressed, it will increase the counter. When the - button is pressed, it will decrease the number.
If the counter goes above 20, the app will toast a message that it is over 20.
Solution Requirements:
- A plus button
- A minus button
- A textview to show the counter
- A toast message when the counter goes above 20.
This application should be very similar to the first application in the book. The focus with this application should be getting familiar with Android Studio and Git.