Reproduce onTransitionCompleted bug

[alexvanyo]

This PR reproduces an issue with MotionLayout.TransitionListener in 2.0.0-beta5 and 2.0.0-beta6.

In Complex Motion Example (4/4), the onTransitionCompleted method is called multiple times, and sometimes with a currentId of -1, which is unexpected:

Clicking the button once results in an output of

2020-05-19 15:02:44.355 30563-30563/com.google.androidstudio.motionlayoutexample D/DemoActivity: 2131230886: currentId is start: false, currentId is end: true
2020-05-19 15:02:44.355 30563-30563/com.google.androidstudio.motionlayoutexample D/DemoActivity: -1: currentId is start: false, currentId is end: false
2020-05-19 15:02:44.355 30563-30563/com.google.androidstudio.motionlayoutexample D/DemoActivity: 2131230886: currentId is start: false, currentId is end: true

Reverting to 2.0.0-beta4 gives the expected output:

2020-05-19 15:03:58.180 30885-30885/com.google.androidstudio.motionlayoutexample D/DemoActivity: 2131230883: currentId is start: false, currentId is end: true

This reproduces https://issuetracker.google.com/issues/157003182

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[muhammad-hamza-shahid]

Hi, @alexvanyo @codingjeremy I am facing the exact same problem, is there any way to deal with this problem because I saw googleBot declared it as Status: Won't Fix (Not Reproducible)

[muhammad-hamza-shahid]

So I have used this to handle the problem hope it works for you as well, Just checked if the event occurs before 250 milli sec, you can customize it according to your need.

if (SystemClock.elapsedRealtime() - mLastSwipe < 250){
                    return
                }
                mLastSwipe = SystemClock.elapsedRealtime()

I have used it in start of onTransitionCompleted() listener and it worked.