setFragmentResult doesn't work onClick listener

Question

hello my problem is the following, I have 2 fragments, one receives with SetFragmentResultListener and another sends with setFragmentResult

The problem is that setFragmentResult does not work inside an OnClickListener but it does work outside

Parent

 setFragmentResultListener("scannedCode") { requestKey, bundle ->
                val result = bundle.getString("code")
                Log.i("MYLOG-find","$result")
            }

Child - It Work

override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        // Inflate the layout for this fragment
        val view = inflater.inflate(R.layout.fragment_scan, container, false)

            setFragmentResult("scannedCode", bundleOf("code" to  "pedro"))
        
        return view
    }

Child - It doesn't Work

 override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        // Inflate the layout for this fragment
        val view = inflater.inflate(R.layout.fragment_scan, container, false)

        view.textView2.setOnClickListener {
            setFragmentResult("scannedCode", bundleOf("code" to  "pedro"))
        }

        return view
    }

Answer 1

As per @ianhanniballake's answer, I went a bit further, because I had a similar problem, and read the documentation he referred (specially, the Receive results in the host activity section). One of the keys in making inter-fragment communication (parent-child) is to use activity's supportFragmentManager methods to perform the information exchange. Example:

• Parent fragment (host)

requireActivity().supportFragmentManager
   .setFragmentResultListener("whatever_id_you_use", viewLifecycleOwner) {
   // Your code for listener
}

• Child fragment:

requireActivity().supportFragmentManager
   .setFragmentResult("whatever_id_you_use", bundle_with_results)

"whatever_id_you_use" is the requestKey depicted in documentation, which is the index the activity will look for when assigning a listener to its result. Doing this way should keep the listeners in sync with the lifecycle, while simplifying own listener's implementation.

Answer 2

In the case of passing data from Child to Parent fragment, using the childFragmentManager is the key when setting the resultListener on the parent fragment.

• Parent fragment (place the code inside onCreate()):

childFragmentManager.setFragmentResultListener("requestKey", this ) { requestKey, bundle ->
            val resultReceived = bundle.getString("bundleKey")
            // do something with the result
            // ...  
        }

• Child fragment (place the code whenever you need to send the result - could be from a click listener, could be once you receive a result from another started activity for result, etc.):

 val resultToBeSent = "result"
 setFragmentResult("requestKey", bundleOf("bundleKey" to resultToBeSent))

More useful information about the communication between fragments can be found in this medium article: The modern way to pass data between fragments and of course in the official Android documentation: Communicating with fragments.