Kotlin静态行RecyclerView仅垂直排列问题求助

我想要创建一个带有2列静态行的RecyclerView，但当前RecyclerView仅显示垂直单列布局，以下是相关代码（所有函数在Fragment的onViewCreated(...)中调用）：

private fun setupRecyclerViews() {
    adapterDoSports = InterestAdapter(viewModel, "doSports")
    setupRecyclerView(adapterDoSports, binding.recyclerViewDoSports)
}

private fun setupRecyclerView(
    adapterInterest: InterestAdapter,
    recyclerViewInterest: RecyclerView
) {
    recyclerViewInterest.layoutManager = GridLayoutManager(requireContext(), 2)
    recyclerViewInterest.apply {
        adapter = adapterInterest
        layoutManager = LinearLayoutManager(activity)
    }
}

private fun setUpObservers() {
    viewModel.myUser.observe(viewLifecycleOwner) { response ->
        when(response) {
            is Resource.Success -> {
                response.data?.let { userResponse ->
                    adapterDoSports.differ.submitList(
                        userResponse.interests.doSports.keys.toMutableList())
                }
            }
            is Resource.Error -> {
                response.message?.let {
                    Log.e(TAG, "An error occurred: $it")
                }
            }
            is Resource.Loading -> {
                //TODO: some loading animation
            }
        }
    }
}

当前显示效果：

问题原因 #

你在setupRecyclerView函数中先设置了GridLayoutManager（2列网格布局），但紧接着在apply代码块里又将layoutManager重新赋值为LinearLayoutManager，这直接覆盖了之前的网格布局配置，导致RecyclerView只能以垂直单列方式显示。

修正方案 #

删除apply块中覆盖布局管理器的代码，或者统一在apply里配置正确的布局管理器，修正后的代码如下：

private fun setupRecyclerView(
    adapterInterest: InterestAdapter,
    recyclerViewInterest: RecyclerView
) {
    recyclerViewInterest.apply {
        adapter = adapterInterest
        layoutManager = GridLayoutManager(requireContext(), 2)
    }
}

这样配置后，RecyclerView就会使用2列的网格布局管理器，实现你想要的静态行排列效果。

内容的提问来源于stack exchange，提问作者Kleini