Question

我需要一些帮助。我一直在尝试实现SearchView，但是当我使用过滤器时，数据不会更改。

我的项目包含一个带有适配器的列表视图。

为什么在我调用notifyDataSetChanged时ListView不显示新数据？

让我知道您是否需要特定的代码段或更多信息。请帮我。预先感谢

class FragmentDiagnosticsTableViewController : Fragment(), SwipeRefreshLayout.OnRefreshListener {

lateinit var mSwipeRefreshLayout: SwipeRefreshLayout
lateinit var elementList: ListView
lateinit var elementListAdapter: ElementAdapter

override fun onRefresh() {

    try {

        if (connected) {

            MaintenanceTableViewController().diagnosticSend()
            while (!csvOkey) {

            }
            saveFile()

            elementListAdapter = ElementAdapter(context!!, totalDiagnosticEntries)

            elementList.adapter = elementListAdapter

            csvOkey = false

        } else {

            try {

                DiagnosticsTableViewController().loadFileCsv(mContext)
                mSwipeRefreshLayout.setRefreshing(false)
                elementListAdapter = ElementAdapter(context!!, totalDiagnosticEntries)
                elementList.adapter = elementListAdapter

            } catch (e: Exception) {
                Toast.makeText(activity, "Impossible to refresh", Toast.LENGTH_SHORT).show()
                mSwipeRefreshLayout.setRefreshing(false)

            }
        }
    } catch (e: Exception) {

        Toast.makeText(activity, "Impossible to refresh", Toast.LENGTH_SHORT).show()
        mSwipeRefreshLayout.setRefreshing(false)

    }
}


companion object {

    fun newInstance(): Fragment {
        var fb: FragmentDiagnosticsTableViewController = FragmentDiagnosticsTableViewController()
        return fb
    }
}

override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {

    val rootView = inflater!!.inflate(R.layout.fragment_diagnostic, container,
            false)

    var builder = StrictMode.VmPolicy.Builder()
    StrictMode.setVmPolicy(builder.build())

    mContext = activity as MaintenanceTableViewController
    mSwipeRefreshLayout = rootView.findViewById<SwipeRefreshLayout>(R.id.swipeRefresh)
    mSwipeRefreshLayout.setOnRefreshListener(this)
    elementList = rootView.findViewById<ListView>(R.id.elementList)


    (activity as AppCompatActivity).supportActionBar?.title = "Diagnostics"
    setHasOptionsMenu(true)
    return rootView

}

override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {

    inflater.inflate(R.menu.men_search, menu)

    val searchItem = menu.findItem(R.id.action_search)
    val searchView = searchItem.actionView as SearchView
    searchView.setQueryHint("Search View Hint")



    searchView.setOnQueryTextListener(object : SearchView.OnQueryTextListener {


        override fun onQueryTextSubmit(query: String): Boolean {
            //Task HERE
            return false
        }

        override fun onQueryTextChange(newText: String): Boolean {


            if (TextUtils.isEmpty(newText)) {
                elementListAdapter.filter("")
                elementList.clearTextFilter()


            } else {
                elementListAdapter.filter(newText)

            }

            return true
        }


    })

}

override fun onOptionsItemSelected(item: MenuItem): Boolean {

    try {
        if (item.itemId == R.id.shareButton) {
            var intentShareFile = Intent(Intent.ACTION_SEND)
            val fileWithinMyDir = filePathMessageLogger
            try {
                if (fileWithinMyDir != null) {
                    if (fileWithinMyDir.exists()) {
                        intentShareFile.setType("text/plain")
                        val fileURI = FileProvider.getUriForFile(activity!!, "com.example.saradalmonte.pocketserviceandroid", fileWithinMyDir!!)
                        intentShareFile.putExtra(Intent.EXTRA_STREAM, fileURI)
                        intentShareFile.putExtra(Intent.EXTRA_TEXT, "File Csv")
                        startActivity(Intent.createChooser(intentShareFile, "Share file"))
                        return true
                    } else {
                        Toast.makeText(activity, "Error File not Exist", Toast.LENGTH_SHORT).show()
                    }
                }
            } catch (e: Exception) {
                Toast.makeText(activity, "Error File not Exist", Toast.LENGTH_SHORT).show()
            }
        }


    } catch (e: Exception) {
        Toast.makeText(activity, "Error File not present", Toast.LENGTH_SHORT).show()
    }
    return true
}

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

    if (view != null) {
        super.onViewCreated(view, savedInstanceState)

        elementListAdapter = ElementAdapter(context!!, totalDiagnosticEntries)
        elementList.adapter = elementListAdapter

    }
}

fun saveFile() {
    val ma = activity as MaintenanceTableViewController
    ma.saveFileDiagnostic()
}

class ElementAdapter : BaseAdapter {

    var totalDiagnosticEntries = mutableListOf<DiagnosticsEntry>()
    var filteredDiagnosticsEntry = arrayListOf<DiagnosticsEntry>()
    var mcontext: Context? = null
    lateinit var inflater: LayoutInflater


    constructor(context: Context, totalDiagnosticEntries: MutableList<DiagnosticsEntry>) : super() {
        this.totalDiagnosticEntries = totalDiagnosticEntries
        this.mcontext = context
    }

    fun listViewAdapter(context: Context, totalDiagnosticEntries: MutableList<DiagnosticsEntry>) {

        mcontext = context
        this.totalDiagnosticEntries = totalDiagnosticEntries
        inflater = LayoutInflater.from(context)
        this.filteredDiagnosticsEntry.addAll(totalDiagnosticEntries)

    }


    override fun getItem(p0: Int): Any {
        return totalDiagnosticEntries[p0]
    }

    override fun getItemId(p0: Int): Long {
        return p0.toLong()
    }

    override fun getCount(): Int {
        return totalDiagnosticEntries.size
    }


    override fun getView(p0: Int, p1: View?, p2: ViewGroup?): View {

        val element = totalDiagnosticEntries[p0]
        var inflator = mcontext!!.getSystemService(Context.LAYOUT_INFLATER_SERVICE) as LayoutInflater
        var myView = inflator.inflate(R.layout.element_diagnostic, null)

        myView.text_No.text = element.No!!
        myView.text_TimeStamp.text = element.Timestamp!!
        myView.text_errorCode.text = element.Code!!

        if (element.Message1 == "") {
            myView.text_Message1.visibility = View.INVISIBLE
        } else {
            myView.text_Message1.visibility = (View.VISIBLE)
            myView.text_Message1.text = element.Message1!!
        }
        if (element.Message2 == "") {

            myView.text_Message2.visibility = View.INVISIBLE

        } else {
            myView.text_Message2.visibility = (View.VISIBLE)
            myView.text_Message2.text = element.Message2!!
        }

        val type = element.Type

        if (type == "8002") {

            val colorBar = myView.findViewById<View>(R.id.color_bar)
            val color = ContextCompat.getColor(mcontext!!, R.color.greenSE)
            colorBar.setBackgroundColor(color)
        } else if (type == "2") {
            val colorBar = myView.findViewById<View>(R.id.color_bar)
            val color = ContextCompat.getColor(mcontext!!, R.color.Yellow)
            colorBar.setBackgroundColor(color)

        } else if (type == "3") {
            val colorBar = myView.findViewById<View>(R.id.color_bar)
            val color = ContextCompat.getColor(mcontext!!, R.color.Orange)
            colorBar.setBackgroundColor(color)

        } else if (type == "4") {
            val colorBar = myView.findViewById<View>(R.id.color_bar)
            val color = ContextCompat.getColor(mcontext!!, R.color.Red)
            colorBar.setBackgroundColor(color)
        } else {
            val colorBar = myView.findViewById<View>(R.id.color_bar)
            val color = ContextCompat.getColor(mcontext!!, R.color.Grey)
            colorBar.setBackgroundColor(color)
        }

        myView.color_bar.setOnClickListener {

            val intent = Intent(mcontext!!, DiagnosticsEntryDetailTableViewCell::class.java)
            intent.putExtra("text_No", element.No)
            intent.putExtra("text_TimeStamp", element.Timestamp)
            intent.putExtra("text_Type", element.Type)
            intent.putExtra("text_Object", element.Object)
            intent.putExtra("text_Istance", element.Instance)

            intent.putExtra("text_Object", element.Object)
            intent.putExtra("text_Code", element.Code)
            intent.putExtra("text_Message1", element.Message1)
            intent.putExtra("text_Message2", element.Message2)
            mContext!!.startActivity(intent)
        }
        return myView
    }

    fun filter(charText: String) {

        var charText = charText
        charText = charText.toLowerCase(Locale.getDefault())
        filteredDiagnosticsEntry.clear()
        if (charText.length == 0) {
            filteredDiagnosticsEntry.addAll(totalDiagnosticEntries)
        } else {
            for (wp: DiagnosticsEntry in totalDiagnosticEntries) {
                if (wp.No!!.contains(charText) || wp.Object!!.contains(charText) || wp.Instance!!.contains(charText) || wp.Message1!!.contains(charText)
                        || wp.Message2!!.contains(charText)) {


                    filteredDiagnosticsEntry.add(wp)
                }
            }
        }

        this.notifyDataSetChanged()
    }
}

Answer 1

您过滤诊断条目并将其放入filteredDiagnosticsEntry，但是在方法getView(...)的适配器中，您仍然使用totalDiagnosticEntries。

在方法totalDiagnosticEntries，filteredDiagnosticsEntry，getItem()中以及在代码的其他片段中，尝试用getCount()替换getView()。请检查BaseAdapter的文档。

例如：

getCount（）

此适配器表示的数据集中有多少个项目。

这意味着您要通过此适配器在ListView上显示多少个元素。如果您提供totalDiagnosticEntries的大小，则适配器将尝试显示与totalDiagnosticEntries包含的项目一样多-为每个项目调用getView。

notifyDataSetChanged（）对我的listView不起作用

1 个答案: