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Android 如何在实时数据回收视图中使用ActionBar进行降序排序？

android kotlin

Android 如何在实时数据回收视图中使用ActionBar进行降序排序？,android,kotlin,Android,Kotlin,Iam使用observe for recyclerview适配器。有默认名称升序排序。我需要在单击操作栏后使用降序排序 private fun getAllTeams(){ viewModel.getMyGroupMembers().observe(viewLifecycleOwner, Observer { val sortedDescending = descending(it) // -> it have to be in onOptionsItemSelec

Iam使用observe for recyclerview适配器。有默认名称升序排序。我需要在单击操作栏后使用降序排序

private fun getAllTeams(){
    viewModel.getMyGroupMembers().observe(viewLifecycleOwner, Observer {
        val sortedDescending = descending(it) // -> it have to be in onOptionsItemSelected
        val sortedList = it.sortedBy {
            it.name }

        Log.d("sorted",sortedList.toString())
        scoreAdapter.submitList(sortedList)
        scoreAdapter.notifyDataSetChanged()

    })
}
单击导航项目后，它将随薪资降序排序（数据类变量）而更改。

这是我的降序方法

private fun descending (getList: List<DataClass>) : List<DataClass>{

    val test = getList.sortedByDescending {
      it.value
    }
    return test
}

private（getList:List）：List{
val测试=getList.sortedByDescending{
it.value
}
回归试验
}
如何将所有这些结合到观察者中？

class TeamScoreTableFragment : Fragment() {

private lateinit var binding: FragmentTeamScoreTableBinding
private lateinit var scoreAdapterBinding: ItemScoreLayoutBinding
private val scoreAdapter: ScoreAdapter by inject()
private val viewModel : ScoreViewModel by inject()



override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setHasOptionsMenu(true)
}

override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
    binding = FragmentTeamScoreTableBinding.inflate(inflater,container,false)
    scoreAdapterBinding = ItemScoreLayoutBinding.inflate(inflater,container,false)

    return binding.root
}

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)

    getAllTeams()
    getGroups()

    binding.rvScoreRecyclerView.apply {

        adapter = this@TeamScoreTableFragment.scoreAdapter
        layoutManager = LinearLayoutManager(context)
    }
}

private fun getAllTeams(){
    viewModel.getMyGroupMembers().observe(viewLifecycleOwner, Observer {
        val sortedDescending = descending(it)
        val sortedList = it.sortedBy {
            it.name }

        Log.d("sorted",sortedList.toString())
        scoreAdapter.submitList(sortedDescending)
        scoreAdapter.notifyDataSetChanged()

    })
}

private fun getGroups() {
    val test = viewModel.getAllGroups()
}

override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
    inflater.inflate(R.menu.menu_togle_items,menu)
    super.onCreateOptionsMenu(menu, inflater)
}

override fun onOptionsItemSelected(item: MenuItem): Boolean {
    if (item.itemId == R.id.menuTogle){

    }
    return super.onOptionsItemSelected(item)
}

private fun descending (getList: List<DataClass>) : List<DataClass>{

    val test = getList.sortedByDescending {
      it.value
    }
    return test
}

类TeamScoreTableFragment:Fragment（）{
私有lateinit变量绑定：FragmentTeamScoreTableBinding
私有lateinit变量scoreAdapterBinding:ItemScoreLayoutBinding
私有val scoreAdapter:scoreAdapter by inject（）
private val viewModel:ScoreViewModel by inject（）
重写创建时的乐趣（savedInstanceState:Bundle？）{
super.onCreate（savedInstanceState）
设置选项菜单（真）
}
覆盖创建视图（充气机：布局充气机，容器：ViewGroup？，savedInstanceState:Bundle？）：视图{
绑定=碎片绑定。充气（充气机、容器、假）
scoreAdapterBinding=ItemScoreLayoutBinding.充气（充气机、容器、假）
返回binding.root
}
覆盖已创建的视图（视图：视图，保存状态：捆绑？）{
super.onViewCreated（视图，savedInstanceState）
getAllTeams（）
getGroups（）
binding.rvScoreRecyclerView.apply{
适配器=this@TeamScoreTableFragment.scoreAdapter
layoutManager=LinearLayoutManager（上下文）
}
}
私人娱乐getAllTeams（）{
viewModel.getMyGroupMembers（）.observe（viewLifecycleOwner，Observer{
val SORTEDESCENDING=下降（it）
val sortedList=it.sortedBy{
it.name}
Log.d（“已排序”，sortedList.toString（））
scoreAdapter.submitList（分类搜索）
scoreAdapter.notifyDataSetChanged（）
})
}
私人娱乐团体（）{
val test=viewModel.getAllGroups（）
}
覆盖创建选项菜单（菜单：菜单，充气机：菜单充气机）{
充气机。充气（右菜单。菜单项，菜单项）
super.onCreateOptions菜单（菜单，充气机）
}
覆盖选项ItemSelected（项：菜单项）：布尔值{
if（item.itemId==R.id.menuTogle）{
}
返回super.onOptionsItemSelected（项目）
}
私人娱乐下降（getList:List）：列表{
val测试=getList.sortedByDescending{
it.value
}
回归试验
}

私有lateinit变量绑定：FragmentTeamScoreTableBinding
私有lateinit变量scoreAdapterBinding:ItemScoreLayoutBinding
私有val scoreAdapter:scoreAdapter by inject（）
private val viewModel:ScoreViewModel by inject（）
私有lateinit变量项：列表
重写创建时的乐趣（savedInstanceState:Bundle？）{
super.onCreate（savedInstanceState）
设置选项菜单（真）
}
覆盖创建视图（充气机：布局充气机，容器：ViewGroup？，savedInstanceState:Bundle？）：视图{
绑定=碎片绑定。充气（充气机、容器、假）
scoreAdapterBinding=ItemScoreLayoutBinding.充气（充气机、容器、假）
返回binding.root
}
覆盖已创建的视图（视图：视图，保存状态：捆绑？）{
super.onViewCreated（视图，savedInstanceState）
getAllTeams（）
getGroups（）
binding.rvScoreRecyclerView.apply{
适配器=this@TeamScoreTableFragment.scoreAdapter
layoutManager=LinearLayoutManager（上下文）
}
}
私人娱乐getAllTeams（）{
viewModel.getMyGroupMembers（）.observe（viewLifecycleOwner，Observer{
项目=it
val sortedList=it.sortedBy{
it.name}
Log.d（“已排序”，sortedList.toString（））
scoreAdapter.submitList（分类列表）
scoreAdapter.notifyDataSetChanged（）
})
}
私人娱乐团体（）{
val test=viewModel.getAllGroups（）
}
覆盖创建选项菜单（菜单：菜单，充气机：菜单充气机）{
充气机。充气（右菜单。菜单项，菜单项）
super.onCreateOptions菜单（菜单，充气机）
}
覆盖选项ItemSelected（项：菜单项）：布尔值{
if（item.itemId==R.id.menuTogle）{
递减（项目）
scoreAdapter.submitList（项目）
scoreAdapter.notifyDataSetChanged（）
}
返回super.onOptionsItemSelected（项目）
}
私人娱乐下降（getList:List）：列表{
val测试=getList.sortedByDescending{
it.value
}
回归试验
}

**你是这个意思吗**
私有变量项：列表？=null
私人娱乐getAllTeams（）{
viewModel.getMyGroupMembers（）.observe（viewLifecycleOwner，Observer{
项目=it
val sortedList=it.sortedBy{
it.name}
Log.d（“已排序”，sortedList.toString（））
scoreAdapter.submitList（分类列表）
scoreAdapter.notifyDataSetChanged（）
})
}
覆盖选项ItemSelected（项：菜单项）：布尔值{
if（item.itemId==R.id.menuTogle）{
项？让{下降（it）}
}
返回super.onOptionsItemSelected（项目）
}

为“it”对象创建一个全局变量（比如xyz）。当你得到响应时，do xyz=it，然后在onoptionItemSelected中使用xyz。你能用代码解释一下吗？我是一个初学者：）好的，你能发布这个类/活动的开始吗？你可以在这里调用这个onoptionItemSelected吗？我发布了所有片段否，只要做一下（item.itemId==R.id.menuTogle）{下降（项目）}在onoptionsItemSelectedAllRight中我得到了它。太谢谢你了！你能投票给我答案吗？答案更新了

class TeamScoreTableFragment : Fragment() {

private lateinit var binding: FragmentTeamScoreTableBinding
private lateinit var scoreAdapterBinding: ItemScoreLayoutBinding
private val scoreAdapter: ScoreAdapter by inject()
private val viewModel : ScoreViewModel by inject()



override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setHasOptionsMenu(true)
}

override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
    binding = FragmentTeamScoreTableBinding.inflate(inflater,container,false)
    scoreAdapterBinding = ItemScoreLayoutBinding.inflate(inflater,container,false)

    return binding.root
}

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)

    getAllTeams()
    getGroups()

    binding.rvScoreRecyclerView.apply {

        adapter = this@TeamScoreTableFragment.scoreAdapter
        layoutManager = LinearLayoutManager(context)
    }
}

private fun getAllTeams(){
    viewModel.getMyGroupMembers().observe(viewLifecycleOwner, Observer {
        val sortedDescending = descending(it)
        val sortedList = it.sortedBy {
            it.name }

        Log.d("sorted",sortedList.toString())
        scoreAdapter.submitList(sortedDescending)
        scoreAdapter.notifyDataSetChanged()

    })
}

private fun getGroups() {
    val test = viewModel.getAllGroups()
}

override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
    inflater.inflate(R.menu.menu_togle_items,menu)
    super.onCreateOptionsMenu(menu, inflater)
}

override fun onOptionsItemSelected(item: MenuItem): Boolean {
    if (item.itemId == R.id.menuTogle){

    }
    return super.onOptionsItemSelected(item)
}

private fun descending (getList: List<DataClass>) : List<DataClass>{

    val test = getList.sortedByDescending {
      it.value
    }
    return test
}



private lateinit var binding: FragmentTeamScoreTableBinding
private lateinit var scoreAdapterBinding: ItemScoreLayoutBinding
private val scoreAdapter: ScoreAdapter by inject()
private val viewModel : ScoreViewModel by inject()

private lateinit var items : List<DataClass>



override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setHasOptionsMenu(true)
}

override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
    binding = FragmentTeamScoreTableBinding.inflate(inflater,container,false)
    scoreAdapterBinding = ItemScoreLayoutBinding.inflate(inflater,container,false)

    return binding.root
}

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)

    getAllTeams()
    getGroups()

    binding.rvScoreRecyclerView.apply {

        adapter = this@TeamScoreTableFragment.scoreAdapter
        layoutManager = LinearLayoutManager(context)
    }
}

private fun getAllTeams(){
    viewModel.getMyGroupMembers().observe(viewLifecycleOwner, Observer {
        items = it

        val sortedList = it.sortedBy {
            it.name }

        Log.d("sorted",sortedList.toString())
        scoreAdapter.submitList(sortedList)
        scoreAdapter.notifyDataSetChanged()

    })
}

private fun getGroups() {
    val test = viewModel.getAllGroups()
}

override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
    inflater.inflate(R.menu.menu_togle_items,menu)
    super.onCreateOptionsMenu(menu, inflater)
}

override fun onOptionsItemSelected(item: MenuItem): Boolean {
    if (item.itemId == R.id.menuTogle){
        descending(items)
        scoreAdapter.submitList(items)
        scoreAdapter.notifyDataSetChanged()
    }
    return super.onOptionsItemSelected(item)
}

private fun descending (getList: List<DataClass>) : List<DataClass>{

    val test = getList.sortedByDescending {
      it.value
    }
    return test
}



**Do you mean so?**
private var items : List<DataClass>? = null

private fun getAllTeams(){
    viewModel.getMyGroupMembers().observe(viewLifecycleOwner, Observer {
        items = it
        
        val sortedList = it.sortedBy {
            it.name }

        Log.d("sorted",sortedList.toString())
        scoreAdapter.submitList(sortedList)
        scoreAdapter.notifyDataSetChanged()

    })
}

override fun onOptionsItemSelected(item: MenuItem): Boolean {
    if (item.itemId == R.id.menuTogle){
        items?.let { descending(it) }
    }
    return super.onOptionsItemSelected(item)
}