We will start by writing the code for the buttons, and then we will look at the runTimer() method. We will use an int called seconds to track how many seconds have passed since the stopwatch started running, and a boolean called running to record whether the stopwatch is currently running. To help us with this, we will use two private variables to record the state of the stopwatch. The runTimer() method will run code every second to check whether the stopwatch is running, and, if it is, increment the number of seconds and display the number of seconds in the text view.
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We will update the stopwatch using a method we will create called runTimer(). We will use these methods to start, stop and reset the stopwatch. When the Start button is clicked, the onClickStart() method gets called, when the Stop button is clicked the onClickStop() method gets called, and when the Reset button is clicked the onClickReset() method gets called. Each button uses its onClick attribute to specify which method in the activity should run when the button is clicked. The layout defines three buttons that we will use to control the stopwatch.
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