在其他请求中提出请求后，应用程序放慢速度

Question

我正在根据用户名提出coroutines的请求，该列表返回object＆lt; profile＆gt;的列表，而在该列表中，我正在用每个对象提出另一个请求，然后切换并传递信息在另一个屏幕上，但是这样的过程使应用程序超级慢，我想找到一种更好的方法或一种不使此过程如此慢的方法。在这里，我的代码

片段从我开始的位置以及应用程序变得超级慢的

 emptyHomeViewModel.getPlayersListByName(text)
                emptyHomeViewModel.listOfPlayersByNameLiveData.observe(viewLifecycleOwner) { playersByName ->
                    emptyHomeViewModel.getPlayersProfileByName(playersByName)
                    emptyHomeViewModel.listOfProfilesByID.observe(viewLifecycleOwner) { profiles ->
                        if (profiles != null) {
                            val list: Array<Profile> = profiles.toTypedArray()
                            bundle = Bundle().apply {
                                putSerializable("user", list)
                            }
                            findNavController().navigate(
                                R.id.action_emptyHomeFragment_to_selectUserFragment,
                                bundle
                            )
                        }
                    }
                }

视图模型从我执行coroutines并向API提出请求的位置

 fun getPlayersListByName(playerName: String) = viewModelScope.launch {
        val playersList = getPlayersByPersonaNameUseCase.getPlayersByName(playerName)
        if (playersList != null) {
            _listOfPlayersByNameLiveData.postValue(playersList)
        }
    }


 fun getPlayersProfileByName(playersByName: List<PlayerByPersonaNameItem>?) =
        viewModelScope.launch {
            var playersProfileList: ArrayList<Profile> = arrayListOf()
            if (playersByName != null) {
                for (player in playersByName) {
                    getPlayerByIDUseCase.getPlayerById(player.accountId)
                        ?.let { playersProfileList.add(it) }
                }
                _listOfProfilesByID.postValue(playersProfileList)
            }
        }

Answer 1

您实际上可以并行加载配置文件，以防止它们接一个地加载，以减少加载数据的时间：

fun getPlayersProfileByName(playersByName: List<PlayerByPersonaNameItem>?) =
    viewModelScope.launch {
        val playersProfileList: List<Profile> = playersByName?.map { player ->
            async {
                getPlayerByIDUseCase.getPlayerById(player.accountId)
            }
        }.awaitAll().filterNotNull()
        _listOfProfilesByID.postValue(playersProfileList)
    }

您也可以通过删除附加livedata观察者和调用getPlayerSplayersProfilebyByname 获得playerSlist后立即：

fun getPlayersListByName(playerName: String) = viewModelScope.launch {
    val playersList = getPlayersByPersonaNameUseCase.getPlayersByName(playerName)
    getPlayersProfileByName(playersList)
}