从Android ViewPager2儿童片段导航到另一个片段

发布于 2025-01-21 00:49:21 字数 489 浏览 0 评论 0原文

有没有办法从ViewPager2的孩子碎片到另一个碎片？假设我有一个父片[parent fragment]仅包含viewPager2和ablayout。我有2个孩子的碎片[Childragment1和Childragment2]由FragmentStateDapter创建。我想从Childrenfragment2导航到另一个FragmentB，以便当我从FragmentB导航时，以显示父母段落到Childfragment2的位置？

例如：ChildFragment1-＆GT; ChildFragment2-＆GT; fragmentb-＆gt; childragment2

我得到：

java.lang.IllegalArgumentException: Navigation action/destination id:actionChildFragment2_to_FragmentB cannot be found from the current destination

原文

Is there a way to navigate from a child fragment of ViewPager2 to another fragment?
Let's say I have a parent fragment [ParentFragment] containing only a ViewPager2 and a TabLayout. I have 2 children fragments [ChildrenFragment1 and ChildrenFragment2] created with FragmentStateAdapter. I want to navigate from ChildrenFragment2 to another FragmentB so that when i navigate back from FragmentB, to show position of the ParentFragment to ChildFragment2?

ex: ChildFragment1 -> ChildFragment2 -> FragmentB -> ChildFragment2

I get:

java.lang.IllegalArgumentException: Navigation action/destination id:actionChildFragment2_to_FragmentB cannot be found from the current destination

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一杆小烟枪 2025-01-28 00:49:21

我找到了一个解决方案，将当前页面保留在ViewModel Livedata属性中，将其设置在ParentFragment内部的页面上：

binding.viewPager.registerOnPageChangeCallback(object : ViewPager2.OnPageChangeCallback() {
        override fun onPageSelected(page: Int) {
            viewModel.updatePageSelected(page)
        }
    })

并观察ParentFragment内部的页面更改：

subscribeToLiveData(viewModel.viewPagerSelected) { page ->
        binding.viewPager.setCurrentItem(page, false)
    }

ParentViewModel：

private val _viewPagerSelected = MutableLiveData<Int>()
val viewPagerSelected: LiveData<Int> = _viewPagerSelected

fun updatePageSelected(newSelection: Int) {
    _viewPagerSelected.value = newSelection
}

I found a solution, i keep the current page in a ViewModel LiveData property, setting it on page change inside the ParentFragment:

binding.viewPager.registerOnPageChangeCallback(object : ViewPager2.OnPageChangeCallback() {
        override fun onPageSelected(page: Int) {
            viewModel.updatePageSelected(page)
        }
    })

and observe the page change inside the ParentFragment:

subscribeToLiveData(viewModel.viewPagerSelected) { page ->
        binding.viewPager.setCurrentItem(page, false)
    }

The ParentViewModel:

private val _viewPagerSelected = MutableLiveData<Int>()
val viewPagerSelected: LiveData<Int> = _viewPagerSelected

fun updatePageSelected(newSelection: Int) {
    _viewPagerSelected.value = newSelection
}

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