Architecture-components-samples: Attach the viewBinding binds with the lifecycle of the fragment

[gastsail]

Is there anyway to add to the instance of the viewBinding viewLifecycleOwner to prevent assigning the binding to null in the onDestroyView() of a Fragment ?

Example

class BindFragment : Fragment(R.layout.fragment_blank) {

    // Scoped to the lifecycle of the fragment's view (between onCreateView and onDestroyView)
    private var fragmentBlankBinding: FragmentBlankBinding? = null

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        val binding = FragmentBlankBinding.bind(view)
        fragmentBlankBinding = binding
        binding.textViewFragment.text = getString(string.hello_from_vb_bindfragment)
    }

    override fun onDestroyView() {
        // Consider not storing the binding instance in a field, if not needed.
        fragmentBlankBinding = null
        super.onDestroyView()
    }
}

Could be transformed as

class BindFragment : Fragment(R.layout.fragment_blank) {

    // Scoped to the lifecycle of the fragment's view (between onCreateView and onDestroyView)
    private lateinit var fragmentBlankBinding: FragmentBlankBinding

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        val binding = FragmentBlankBinding.bind(viewLifecycleOwner,view)
        fragmentBlankBinding = binding
        binding.textViewFragment.text = getString(string.hello_from_vb_bindfragment)
    }
}

This way the binding could handle the destroy of the instance by itself instead of manually doing it in each Fragment that provides the bindings

It maybe can be called viewBindingLifecycleOwner and it should handle this removal of the instance by itself

Source: https://developer.android.com/topic/libraries/view-binding#fragments

[hoc081098]

See my extension functions: https://github.com/hoc081098/ViewBindingDelegate

[AdoniasAlcantara]

It's not really a solution, just an alternative way to do the same thing.

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    FragmentBlankBinding.bind(view).apply {
        textView.text = getString(string.hello_from_vb_bindfragment)

        // Set up other ui related stuff
    }
}

So you avoid having to assign null to binding.

[gastsail]

Excellent @hoc081098 , thanks