问在自定义listView中搜索，从工具栏- Kotlin

EN

override fun onCreate(savedInstanceState: Bundle?) {
        ...
        setSupportActionBar(toolbar)
        supportActionBar!!.setDisplayHomeAsUpEnabled(true)

        var listView = findViewById<ListView>(R.id.listView)
        val customAdptor = CustomAdapterListView(this)
        listView.adapter=customAdptor
    }

class CustomAdapterBJCP(private val context: Activity): BaseAdapter(){

    var db = DataBaseHandler(context)
    var data = db.DataExample()

    override fun getView(p0: Int, p1: View?, p2: ViewGroup?): View {
        val inflater = context.layoutInflater
        val view1 = inflater.inflate(R.layout.CustomList,null)
        var fName= view1.findViewById<TextView>(R.id.txtOne)
        var FDetail= view1.findViewById<TextView>(R.id.txtTwo)
        var fCount = view1.findViewById<TextView>(R.id.txtThree)

        fName.text = data[p0].name
        FDetail.text = data[p0].detail
        fCount .text= data[p0].count
        return view1
    }

    override fun getItem(p0: Int): Any {
        return data.get(p0).name
    }

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

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


    }

<menu...>
<item android:id="@+id/action_search"
          android:title="Search"
          app:showAsAction="always|collapseActionView"
          android:icon="@android:drawable/ic_menu_search"
          app:actionViewClass="android.support.v7.widget.SearchView"  />
</menu>

...
 override fun onCreateOptionsMenu(menu: Menu): Boolean {

        menuInflater.inflate(R.menu.menu_main,menu)
        val searchItem = menu.findItem(R.id.action_search)
        if(searchItem!=null){
            val searchView=searchItem.actionView as SearchView
            searchView.setOnQueryTextListener(object : SearchView.OnQueryTextListener{
                override fun onQueryTextSubmit(query: String?): Boolean {
                    return true
                }
                override fun onQueryTextChange(newText: String?): Boolean {
                    return true
                }

            })
        }
        return super.onCreateOptionsMenu(menu)
    }
...