y cannot be cast to com.example.runtrackerapp.databinding.ActivityMainBinding?-CodePudding

I am developing new app when I run project I am getting following java.lang.ClassCastException: com.example.runtrackerapp.ui.MainActivity cannot be cast to com.example.runtrackerapp.databinding.ActivityMainBinding at com.example.runtrackerapp.ui.fragments.SetupFragment.writePersonalDataToSharedPref(SetupFragment.kt:84) at com.example.runtrackerapp.ui.fragments.SetupFragment.onViewCreated$lambda-0(SetupFragment.kt:60) at com.example.runtrackerapp.ui.fragments.SetupFragment.$r8$lambda$4d3caNvVygzMMPPCQbih5sKklFY(Unknown Source:0) at com.example.runtrackerapp.ui.fragments.SetupFragment$$ExternalSyntheticLambda0.onClick(Unknown Source:2) at android.view.View.performClick(View.java:6614) at android.view.View.performClickInternal(View.java:6587) at android.view.View.access$3100(View.java:787) at android.view.View$PerformClick.run(View.java:26122) at android.os.Handler.handleCallback(Handler.java:873) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:201)

below my SetupFragment.kt where exception occuring

@AndroidEntryPoint
class SetupFragment : Fragment() {
    private var _binding: FragmentSetupBinding? = null
    private val binding get() = _binding!!
    @Inject
    lateinit var sharedPref: SharedPreferences





    @set:Inject
    var isFirstAppOpen = true
    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View {

        // inflate the layout and bind to the _binding
        _binding = FragmentSetupBinding.inflate(inflater, container, false)

        return binding.root
    }


    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        if(!isFirstAppOpen){
            val navOptions = NavOptions.Builder()
                .setPopUpTo(R.id.setupFragment, true)
                .build()
            findNavController().navigate(
                R.id.action_setupFragment_to_runFragment,
            savedInstanceState,
            navOptions)
        }
        binding.tvContinue.setOnClickListener {
            val success = writePersonalDataToSharedPref()
            if (success){
                findNavController().navigate(R.id.action_setupFragment_to_runFragment)
            }else{
                Snackbar.make(requireView(), "Please enter all the fields", Snackbar.LENGTH_SHORT).show()
            }

        }


    }
    private fun writePersonalDataToSharedPref(): Boolean {
        val name = binding.etName.text.toString()
        val weight = binding.etWeight.text.toString()
        if(name.isEmpty() || weight.isEmpty()) {
            return false
        }
        sharedPref.edit()
            .putString(KEY_NAME, name)
            .putFloat(KEY_WEIGHT, weight.toFloat())
            .putBoolean(KEY_FIRST_TIME_TOGGLE, false)
            .apply()
        val toolbarText = "Let's go, $name!"

        (requireActivity() as ActivityMainBinding).tvToolbarTitle.text = toolbarText
        return true
    }



}

I want to know exactly where I am making mistake

CodePudding user response：

(requireActivity() as MainActivity).tvToolbarTitle.text = toolbarText

(requireActivity() as MainActivity).binding.tvToolbarTitle.text = toolbarText

error is with ActivityMainBinding this line add your activity name here like (MainActivity)

CodePudding user response：

(requireActivity() as ActivityMainBinding) This is the problem statement .. You can not cast Activity to a Binding Object because they are not related in any way ..

Although this is a wrong approach IMO . for now to make it work you can make your binding object public . and access it as below .

(requireActivity() as MainActivity).binding.tvToolbarTitle.text = toolbarText

For a better implementation you can use a SharedViewModel . Or have the toolbar in fragment itself if possible.