How to Implement Countdown Timer with Linear & Circular Progress Bar in Android Studio Kotlin

This is an Android app that implements a countdown timer.

The main activity is defined in the MainActivity class, which extends the AppCompatActivity class.

The countdown timer is implemented using a CustomCountdownTimer class, which extends the CountDownTimer class provided by Android. The CustomCountdownTimer class provides additional functionality to pause, resume, and restart the timer.

In the onCreate() method of the MainActivity class, the layout widgets are initialized and the CustomCountdownTimer is created and started.

When the pause button is clicked, the CustomCountdownTimer is paused and the progress bars are also paused. When the resume button is clicked, the CustomCountdownTimer is resumed and the progress bars continue from where they left off. When the reset button is clicked, the CustomCountdownTimer is reset to its original value and the progress bars are reset to their initial state.

The CustomCountdownTimer class also provides a callback interface, OnCountdownListener, which can be implemented by the MainActivity class to perform additional actions when the timer reaches zero. In this app, the OnCountdownListener is used to display a message when the timer reaches zero.

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