如何修复 Android Studio 中的底部导航栏 + recyclerview 问题？

问题描述

我正在尝试将数据从服务器获取到 recyclerView 并且它在第一次加载时正常工作，但是一旦我移动到另一个片段，所有片段都停止工作，如下所示

这是第一个片段：

class MainFragmentAdapter : Fragment() {

    private lateinit var dashboardviewmodel: MainModel
    val fullStoresList : MutableList<FullStoresModel> = ArrayList()
    private lateinit var mContext : Context
    override fun onAttach(context: Context) {
        super.onAttach(context)
        this.mContext = context
    }
    override fun onCreateView(
        inflater: LayoutInflater,container: ViewGroup?,savedInstanceState: Bundle?
    ): View? {
        dashboardviewmodel =
            viewmodelProvider(this).get(MainModel::class.java)
        val root = inflater.inflate(R.layout.main_fragment,container,false)


        /**
         * Check Internet Connection
         */
        root.firstStoreTV.visibility = View.GONE
        if (!isConnected(mContext)){
            wifiManager = mContext.applicationContext.getSystemService(Context.WIFI_SERVICE) as WifiManager
            root.no_store.visibility = View.GONE
            root.firstStoreTV.visibility = View.GONE
            root.tryAgain.visibility = View.VISIBLE
            root.imageView.visibility = View.VISIBLE

            wifiManager!!.isWifiEnabled = true
        }else{
            if (fullStoresList.isEmpty()){
                root.no_store.visibility = View.VISIBLE
                root.firstStoreTV.visibility = View.VISIBLE
                root.storesRV.visibility = View.GONE
                root.yourStoresTV.visibility = View.GONE
            }else{
                root.storesRV.visibility = View.VISIBLE
                root.yourStoresTV.visibility = View.VISIBLE
                root.no_store.visibility = View.GONE
                root.firstStoreTV.visibility = View.GONE
            }
            root.tryAgain.visibility = View.GONE
            root.imageView.visibility = View.GONE
        }
        return root
    }
    override fun onViewCreated(view: View,savedInstanceState: Bundle?) {
        super.onViewCreated(view,savedInstanceState)
        /**
         * Calling Data
         */
        val progressBar = view.findViewById<ProgressBar>(R.id.progressBar)

        getStoresDataByID(requireContext().applicationContext,progressBar!!,Sessions(requireContext().applicationContext).getToken()!!,object : CustomCallback {
            override fun getStoreDataLists(
                storesList: MutableList<StoresModel>,storesMenusList: MutableList<MenusModel>,storeratingsList: MutableList<ratingsModel>
            ) {
//                Log.e("storesList",storesList.toString())
                fullStoresList.clear()
                for (i in 0 until storesList.size) {
                    var storerating = 0.0
                    var numberOfratings = 0
                    var menusNumber = 0
                    for (j in 0 until storeratingsList.size) {
                        if (storeratingsList[j].ratedItemId == storesList[i].restaurantId) {
                            numberOfratings++
                            storerating += storeratingsList[j].ratingValue!!
                        }
                    }
                    for (k in 0 until storesMenusList.size) {
                        if (storesMenusList[k].restaurantId == storesList[i].restaurantId) {
                            menusNumber++
                        }
                    }
                    if (numberOfratings != 0) {
                        storerating /= numberOfratings
                    }
                    val rate = String.format("%.1f",storerating)

                    fullStoresList.add(
                        FullStoresModel(
                            storesList[i].restaurantId,storesList[i].ownerId,storesList[i].restaurantName,storesList[i].restaurantPhone,storesList[i].restaurantType,storesList[i].nrc,storesList[i].nis,storesList[i].nif,storesList[i].workingDays,storesList[i].workingHours,storesList[i].storeImage,menusNumber,rate
                        )
                    )
                }

                val myRV = view.findViewById<RecyclerView>(R.id.storesRV)
                val myOptionsAdapter = StoresAdapter(context,fullStoresList)
                myRV!!.layoutManager = GridLayoutManager(context,1)
                ViewCompat.setnestedScrollingEnabled(myRV,true)
                myRV.scrollBarSize = 20
                myRV.isverticalScrollBarEnabled = true
                myRV.isScrollContainer = true
                myRV.adapter = myOptionsAdapter
                if (storesList.isNotEmpty()) {
                    view.storesRV.visibility = View.VISIBLE
                    view.yourStoresTV.visibility = View.VISIBLE
                    view.no_store.visibility = View.GONE
                } else {
                    view.storesRV.visibility = View.GONE
                    view.yourStoresTV.visibility = View.GONE
                    view.no_store.visibility = View.VISIBLE
                }
            }
        })

    }

我正在使用函数 getStoresDataByID 从服务器获取数据 它工作正常，我注意到底部导航栏工作 如果 fullStoresList 为空，则正确

第一个片段在第一次使用时工作正常，但当我点击第二个项目时，所有片段都停止工作，屏幕将如上图所示。

解决方法

暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！

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