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// getLiveData gets MutableLiveData associated with a key. 
// When the value associated with the key updates, the MutableLiveData does as well.
private val _userId : MutableLiveData<String> = savedStateHandle.getLiveData(USER_KEY)

// Only expose a immutable LiveData
val userId : LiveData<String> = _userId

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class MyViewModel(state : SavedStateHandle) : ViewModel() {

    // Keep the key as a constant
    companion object {
        private val USER_KEY = "userId"
    }
    
    private val savedStateHandle = state
    
    fun saveCurrentUser(userId: String) {

ceruleanotter

// This ktx requires at least androidx.fragment:fragment-ktx:1.1.0 or 
// androidx.activity:activity-ktx:1.0.0
val viewModel by viewModels { SavedStateVMFactory(this) }
// Or the non-ktx way...
val viewModel = ViewModelProvider(this, SavedStateVMFactory(this))
            .get(MyViewModel::class.java)

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// In your UI (activity, fragment, etc)
WorkManager.getInstance().getWorkInfoByIdLiveData(uploadWorkRequest.id)
        .observe(lifecycleOwner, Observer { workInfo ->
            // Check if the current work's state is "successfully finished"
            if (workInfo != null && workInfo.state == WorkInfo.State.SUCCEEDED) {
                displayImage(workInfo.outputData.getString(KEY_IMAGE_URI))
            }
        })

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val compressWorkRequest = OneTimeWorkRequestBuilder<CompressWorker>()
        .setInputMerger(ArrayCreatingInputMerger::class.java)
        .setConstraints(constraints)
        .build()

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WorkManager.getInstance()
    .beginWith(Arrays.asList(
                             filterImageOneWorkRequest, 
                             filterImageTwoWorkRequest, 
                             filterImageThreeWorkRequest))
    .then(compressWorkRequest)
    .then(uploadWorkRequest)
    .enqueue()

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WorkManager.getInstance().enqueue(uploadWorkRequest)

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// Create the Constraints
val constraints = Constraints.Builder()
        .setRequiredNetworkType(NetworkType.CONNECTED)
        .build()

// Define the input
val imageData = workDataOf(Constants.KEY_IMAGE_URI to imageUriString)

// Bring it all together by creating the WorkRequest; this also sets the back off criteria
val uploadWorkRequest = OneTimeWorkRequestBuilder<UploadWorker>()

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val constraints = Constraints.Builder()
        .setRequiresBatteryNotLow(true)
        .setRequiredNetworkType(NetworkType.CONNECTED)
        .setRequiresCharging(true)
        .setRequiresStorageNotLow(true)
        .setRequiresDeviceIdle(true)
        .build()

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val constraints = Constraints.Builder()
        .setRequiredNetworkType(NetworkType.CONNECTED)
        .build()