我怎样才能做文本计时器

Question

我想在用户单击“重新发送”时显示 1 分钟的计时器

Text(
   text = "Re-send",
   modifier = Modifier.clickable { },
   color = Color.Blue
)

Answer 1

要创建具有 2 种颜色的文本，您需要 annotatedString，为了重新发送可点击，您需要重新发送的索引和 ClickableText

要创建计时器，您可以使用 LaunchedEffect，如下面的代码片段所示

@Composable
private fun ResendTextSample() {

    val str = "Did you not receive the email? "
    val length = str.length

    var isTimerActive by remember {
        mutableStateOf(false)
    }

    var time by remember { mutableStateOf("") }

    LaunchedEffect(key1 = isTimerActive) {
       if(isTimerActive){
           var second = 0
           while (second < 15) {
               time = if(second <10) "0:0$second" else "0:$second"
               delay(1000)
               second++
           }
           isTimerActive = false
       }
    }

    val annotatedLinkString = buildAnnotatedString {

        append(str)
        withStyle(
            SpanStyle(
                color = Color.Blue,
            )
        ) {
            if (!isTimerActive) {
                append("Re-send")
            } else {
                append(time)
            }
        }
        append("\nCheck your spam filter")

    }

    ClickableText(
        text = annotatedLinkString,
        style = TextStyle(fontSize = 20.sp),
        onClick = {
            if (!isTimerActive && it >= length && it <= length + 7) {
                isTimerActive = true
            }
        }
    )
}

结果。在演示中，我将最大时间设置为 15 秒，以显示已启用重新发送。