openWorkout | Simple workout trainer that puts your privacy first | Mobile Application library

I wanted to make a workout app that counts the working seconds and the rest seconds based on user input (user inputs only the work seconds). I tried to create a loop (in this case, for testing, running only 2 times where I call serie() ). This function takes an int as a param. and displays a countdown from that variable to 0. In my loop I call this 2 times ( once for the working seconds and once for rest seconds). In the loop the countdown takes place only for the rest seconds (maybe because it is already initialized, and doesn't depend on user input ??) and after it hits 0 it doesn't repeat. In the first screen the user types in a number of secs. and presses the submit button. After that the second activity will run where this code is. There isn't a problem with the passing of variables between activities.

main activity code :