Android 我该怎么做文本计时器

发布于12月01日

我想显示1分钟的计时器，当用户点击重新发送

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

推荐答案

要创建具有2种 colored颜色的文本，您需要批注字符串，要使重新发送可点击，您需要重新发送和点击文本的索引

要创建计时器，可以使用LaunchedEffect，如下所示

@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，以显示重新发送已启用.