问协程视图模型执行

EN

@ExperimentalCoroutinesApi
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    setActionBar()
    super.onViewCreated(view, savedInstanceState)
    observeHasExpandedState()
    viewLifecycleOwner.lifecycleScope.launch {
        Log.d("DETAIL", "launch")
        if (!hasExpanded){
            Log.d("DETAIL", "!hasExpanded")
            Log.d("DETAIL", "setImageView started")
            setImageView(imageUrl) // waits for a callback to complete
            Log.d("DETAIL", "setImageView finished")
            Log.d("DETAIL", "handleEnterAnimation started")
            handleEnterAnimation() // waits for animation to complete
            Log.d("DETAIL", "handleEnterAnimation finished")
            viewModel.setRevealAnimationExpandedState(true)
        }
        observeSomeOtherData()
    }
}



private fun observeHasExpandedState() {
    viewModel.revealAnimationExpanded.observe(
        viewLifecycleOwner,
        Observer { hasExpanded ->
            Log.d("DETAIL", "hasExpanded changed - $hasExpanded")
            this.hasExpanded = hasExpanded
        }
    )
}

    D/DETAIL: launch
    D/DETAIL: !hasExpanded
    D/DETAIL: setImageView started
    D/DETAIL: hasExpanded changed - false # (I want to have this called first)
    D/DETAIL: setImageView started
    D/DETAIL: setImageView finished
    D/DETAIL: handleEnterAnimation started
    D/DETAIL: handleEnterAnimation finished
    D/DETAIL: hasExpanded changed - true
    D/DETAIL: observeSomeOtherData