如何将 MotionEvent 停机时间与时钟进行比较，它的时间基础是什么？

Question

我正在尝试确定 MotionEvent 的时间顺序与 UI 对象中定期发生的事情的时间顺序。

private var rotateFinishTime: Long = -1
....
fun somethingHappensPeriodically() {
    Log.d(tag_, "show new round")
    ...
    this.rotateFinishTime = SystemClock.elapsedRealtime()
}

我附上了 GestureDetector.OnGestureListener：

   override fun onSingleTapConfirmed(gd: GestureDetector, e: MotionEvent): Boolean {
        // for tap: since it comes delayed, have to check event time
        if (e.downTime < this.rotateFinishTime || this.rotating) {
            Log.d(tag_, "e.downTime: $e.downTime rotateFinishTime: $rotateFinishTime downTime - rotateFinishTime: ${e.downTime - rotateFinishTime} rotating: $rotating")
            return true
        }
        ... do stuff
    }

e.downTime: 4763800 rotateFinishTime: 18832541 downTime - rotateFinishTime: -14068741 rotating: false

所以经过的实时时间似乎不是时间基础。显然，unix 纪元时间也不适合。有趣的注意事项：计算在 qemu 模拟器上产生 "expected" 结果，但在我的设备上没有 Android 6.0 flashed.

Answer 1

我想我找到了：我应该调用 SystemClock.uptimeMillis() 来进行有效比较。文档埋在InputEvent里，他们不在MotionEvent上背诵和重复：

/** * Retrieve the time this event occurred, * in the {@link android.os.SystemClock#uptimeMillis} time base. * * @return Returns the time this event occurred, * in the {@link android.os.SystemClock#uptimeMillis} time base. */

显然，模拟器从未进入深度睡眠！

如何将 MotionEvent 停机时间与时钟进行比较，它的时间基础是什么？

How to compare MotionEvent downtime to a clock, what is its time basis?

android

android-event

kotlin