CountdownView | Android Countdown View | Android library

You do not need to create a DateTimeFormatter for the given date-time string as it's already in the format used by Instant#parse. Also, you do not need to convert the parsed date-time from Instant to some other type as ChronoUnit.SECONDS.between works for any Temporal type.

Your problem is that 8 does not represent August but September, and the 23rd of September is more or less 52 days from now. The month is 0-indexed.

Solution: use 7 for August.

See e.g. https://stackoverflow.com/a/344400/2442804 for an attempt at explaining why.

i have managed to update text using alert.

i have declared date as State so whenever date is changed using alert text will also get updated.

findViewbyId is changed in android studio 3.*

refer

findViewById() signature change All instances of the findViewById() method now return T instead of View. This change has the following implications:

This may result in existing code now having ambiguous return type, for example if there is both someMethod(View) and someMethod(TextView) that takes the result of a call to findViewById(). When using Java 8 source language, this requires an explicit cast to View when the return type is unconstrained (for example, assertNotNull(findViewById(...)).someViewMethod()). Overrides of non-final findViewById() methods (for example, Activity.findViewById()) will need their return type updated.

just try ,

The main problem is that you are creating n numbers of CountRunnables and m number MessageRunnables. Despite creating more than one numbers of handlers you are removing callbacks only for the latest-created Hanlder.

Here's what you should do:

Keep a reference of all the Handlers and Runnables and call messageHandler.removeCallbacksAndMessages(null); and countDownHandler.removeCallbacksAndMessages(null); on all of them.

Add to viewDidLoad next code and save target date as property or ivar

It's been solved. I was using an actual window instead of a user control. I set up a new view (user control) to test and it worked, so I double checked the view I wanted and it was actually a window.

Use usercontrols not windows for new views.

You did not define any constructor for Countdown.CountdownController and Countdown.CountdownView, so the line new Countdown.CountdownView() and Countdown.CountdownController() will throw your error.

Edit:

You need to export/import your definitions in CountdownView.js and CountdownController.js.

Also I would change the definition of Countdown.CountdownView = ... by CountdownView = ... and replace the lines where you instantiate it from new Countdown.CountdownView(...) by new CountdownView(...)