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kotlinlang

VID_20210818_092728.mp4

I want to start timer as soon as activity start but it keep on starting again and again attached video also for reference and code

<@U01UYJNQ49K> can you edit your post to put the code in this thread please?

<https://kotlinlang.slack.com/archives/CJLTWPH7S/p1616265877303000>

```class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            CountDownAppWithComposeTheme {
                // A surface container using the 'background' color from the theme
                Surface(color = MaterialTheme.colors.background) {
                    CountDown()
                }
            }
        }
    }
}

@Composable
fun CountDown() {

    var nums: String by remember{ mutableStateOf("")}
    var setView: String by remember{ mutableStateOf("00:00")}

    val countNum = object: CountDownTimer(140000, 1000){
        override fun onTick(millisUntilFinished: Long) {
//            nums = millisUntilFinished/1000
            val minutes = TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished)

            // long seconds = (milliseconds / 1000);
            val seconds = TimeUnit.MILLISECONDS.toSeconds(millisUntilFinished)
            val tt = TimeUnit.MINUTES.toSeconds(minutes)

            nums = String.format(Locale.ENGLISH,"%02d  : %02d",minutes,seconds-tt)
            setView = nums
        }

        override fun onFinish() {
            setView = "Finished"
        }
    }.start()


    Column(modifier = Modifier.padding(16.dp), verticalArrangement = Arrangement.Center) {
        Text(text = setView, modifier = Modifier.padding(bottom = 8.dp),
        style = MaterialTheme.typography.h5)
        Button(onClick = { countNum.start() }) {
            Text(text = "Start CountDown")
            
        }

    }
}```


<@U3ZPQ4QR4> you mean something like that
```var countNum1 : CountDownTimer by remember {mutableStateOf()}```


```val countNum = remember { 
    object: CountDownTimer(140000, 1000){
...
    }.start()
}```
No state here. Just a `val` that should be remembered instead of being recreated on recomposition

And maybe you should start/stop the timer as `DisposableEffect`
<https://jorgecastillo.dev/jetpack-compose-effect-handlers>