Disable focus on fragment

Question

I\'m working on application for TV platform and use RCU for navigation.

I have use case where I have two fragments one above each other and visible on the screen at

Answer 1

I had the same problem and the accepted answer worked for me.

Here is my version of the implementation so far (it can be improved):

abstract class BaseFragment<....> : Fragment() {

    private val screenFocusHelper = ScreenFocusHelper()

    fun enableFocus() {
        if (view != null) {
            // Enable focus
            screenFocusHelper.setEnableView(view as ViewGroup, true)

            // Clear focusable elements
            screenFocusHelper.focusableViews.clear()
        }

        childFragmentManager.fragments.forEach {
            if (it is BaseFragment<*, *>) {
                it.enableFocus()
            }
        }
    }

    fun disableFocus() {
        if (view != null) {
            // Store last focused element
            screenFocusHelper.previousFocus = view?.findFocus()

            // Clear current focus
            view!!.clearFocus()

            // Disable focus
            screenFocusHelper.setEnableView(view as ViewGroup, false)
        }

        childFragmentManager.fragments.forEach {
            if (it is BaseFragment<*, *>) {
                it.disableFocus()
            }
        }
    }

}

class ScreenFocusHelper {

    var previousFocus: View? = null

    val focusableViews: MutableList = mutableListOf()

    fun setEnableView(viewGroup: ViewGroup, isEnabled: Boolean) {
        findFocusableViews(viewGroup)

        for (view in focusableViews) {
            view.isEnabled = isEnabled
            view.isFocusable = isEnabled
        }
    }

    private fun findFocusableViews(viewGroup: ViewGroup) {
        val childCount = viewGroup.childCount
        for (i in 0 until childCount) {
            val view = viewGroup.getChildAt(i)
            if (view.isFocusable) {
                if (!focusableViews.contains(view)) {
                    focusableViews += view
                }
            }
            if (view is ViewGroup) {
                findFocusableViews(view)
            }
        }
    }

}