如何控制ValueAnimator的更新速度

Question

10秒内，从1到10

正常计算结果为

1,
1.1,
1.2,
1.3
...
9.7,
9.8,
9.9,
10

我想要的结果是

1, 2, 3, 4, 5, 6, 7, 8, 9, 10

每秒更新

如何实现？

谢谢 ------------------例子------------------------

        ValueAnimator.setFrameDelay(1000)
        val animator = ValueAnimator.ofInt(1, 5)
        animator.addUpdateListener { animation ->
            Log.d("TTT", "${animation.animatedValue}")
        }
        animator.duration = 5000
        animator.start()

日志：

2020-10-14 03:40:18.883 28503-28503/XXXXX D/TTT: 1
2020-10-14 03:40:18.900 28503-28503/XXXXX D/TTT: 1
2020-10-14 03:40:18.916 28503-28503/XXXXX D/TTT: 1
2020-10-14 03:40:18.933 28503-28503/XXXXX D/TTT: 1
2020-10-14 03:40:19.131 28503-28503/XXXXX D/TTT: 1
2020-10-14 03:40:19.147 28503-28503/XXXXX D/TTT: 1
2020-10-14 03:40:19.478 28503-28503/XXXXX D/TTT: 1
2020-10-14 03:40:19.494 28503-28503/XXXXX D/TTT: 1
2020-10-14 03:40:20.073 28503-28503/XXXXX D/TTT: 1
2020-10-14 03:40:20.089 28503-28503/XXXXX D/TTT: 2
2020-10-14 03:40:20.319 28503-28503/XXXXX D/TTT: 2
2020-10-14 03:40:20.336 28503-28503/XXXXX D/TTT: 2
2020-10-14 03:40:20.469 28503-28503/XXXXX D/TTT: 2
2020-10-14 03:40:20.485 28503-28503/XXXXX D/TTT: 2
2020-10-14 03:40:20.584 28503-28503/XXXXX D/TTT: 2
2020-10-14 03:40:20.600 28503-28503/XXXXX D/TTT: 2
2020-10-14 03:40:20.914 28503-28503/XXXXX D/TTT: 2
2020-10-14 03:40:20.931 28503-28503/XXXXX D/TTT: 3
2020-10-14 03:40:21.475 28503-28503/XXXXX D/TTT: 3
2020-10-14 03:40:21.491 28503-28503/XXXXX D/TTT: 3
2020-10-14 03:40:21.756 28503-28503/XXXXX D/TTT: 3
2020-10-14 03:40:21.772 28503-28503/XXXXX D/TTT: 4
2020-10-14 03:40:22.465 28503-28503/XXXXX D/TTT: 4
2020-10-14 03:40:22.481 28503-28503/XXXXX D/TTT: 4
2020-10-14 03:40:23.406 28503-28503/XXXXX D/TTT: 4
2020-10-14 03:40:23.422 28503-28503/XXXXX D/TTT: 5

我需要这样的：

2020-10-14 03:40:21.772 28503-28503/XXXXX D/TTT: 1
2020-10-14 03:40:22.465 28503-28503/XXXXX D/TTT: 2
2020-10-14 03:40:22.481 28503-28503/XXXXX D/TTT: 3
2020-10-14 03:40:23.406 28503-28503/XXXXX D/TTT: 4
2020-10-14 03:40:23.422 28503-28503/XXXXX D/TTT: 5

Answer 1

无法调整 ValueAniamtor 更新率，因为它用于动画，因此会以非常高的速度刷新。

相反，您可以使用 Timer class，按特定速率进行调度，例如下一个：

Timer().scheduleAtFixedRate(object : TimerTask() {
        var value = 1 // Initial value

        override fun run() {
            value++

            Log.d("TTT", "$value")

            if (value > 10)  // Exit after 10
                this.cancel()
        }
    }, 0, 500) // Update every 500 milliseconds

例如，如果您需要 5 秒持续时间的 10 次迭代，则将更新速率设置为 500，（公式：5000 毫秒 / 10 次迭代）

Answer 2

您可以使用 CountDownTimer:

val timer = object : CountDownTimer(5000L, 1000L) {
    var counter = 1
    override fun onTick(millisUntilFinished: Long) {
        Log.d("TTT", "${counter++}")
    }

    override fun onFinish() {}
}

timer.start()

如何控制ValueAnimator的更新速度

How to control the update speed of ValueAnimator

android

android-animation