CODEWITHSUNDEEP
androidandroid-fragmentskotlinandroid-viewmodel
Edgar J.
Edgar J.

Reputation: 172

How to communicate from Fragment to ViewModel?

I currently have an interface that's implemented in the MainActivity that allows communication with the NumberFragment. The onCountClicked is the method in NumberFragment receiving the id of the item click.

Question

How can I send the onCountClicked position to the NumberFragmentViewModel every time an item is clicked?

Note: Using databinding & recycleview

Main Activity 

  val newFragment = NumberFragment()
                 val args = Bundle()
                 args.putInt(NumberFragment().onCountClicked(data).toString(),data.toInt())

                newFragment.arguments = args

Number Fragment

override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
                              savedInstanceState: Bundle?): View? {
 val sleepTrackerViewModel =
            ViewModelProviders.of(
                    this, viewModelFactory).get(NumberViewModel::class.java)

    setHasOptionsMenu(true)

    binding.setLifecycleOwner(this)

    binding.sleepTrackerViewModel = sleepTrackerViewModel

    //Observes for any changes on database and updates the UI
    sleepTrackerViewModel.dbCount.observe(this, Observer {dbCount ->
        dbView.text = dbCount.number.toString()
    })
    return binding.root
}

   fun onCountClicked(position: Long) {
        Log.i("NumberF" , "------------->" + position)
    }

Upvotes: 1

Views: 85

Answers (1)

PhillauSofia
PhillauSofia

Reputation: 391

You can just simply create a method in the viewModel that receives that position and updates the value of the live data. I would do it like this:

private val _idItemClicked = MutableLiveData<Int>()
val idItemClicked: LiveData<Int> = _idItemClicked

fun setIdItemClicked(id: Int) {
   _idItemClicked.value = id
}

Now you call the function setIdItemClicked to set a new value.

Upvotes: 1

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