How can I solve androidx.appcompat.widget.SearchView cannot be cast to android.widget.SearchView-CodePudding

I know there are a lot of questions about that error. Tried many solutions, I realized something was different in my case. Can anyone please help? I tried to apply searchview to recyclerview, and inserted filter() in reyclerview adapter and setOnQueryTextListener in mainactivity.

But I got the following error: androidx.appcompat.widget.SearchView cannot be cast to android.widget.SearchView

MainActivity.kt

import android.app.Activity
import android.content.Context
import android.content.Intent
import android.graphics.Canvas
import android.graphics.drawable.Drawable
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.*
import androidx.core.content.ContextCompat
import androidx.recyclerview.widget.DividerItemDecoration
import androidx.recyclerview.widget.GridLayoutManager
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import com.example.co_investorux_ui.databinding.ActivityMainBinding
import com.example.co_investorux_ui.databinding.ItemViewBinding
import com.sothree.slidinguppanel.SlidingUpPanelLayout
import java.util.*
import kotlin.collections.ArrayList
import android.app.SearchManager
import android.widget.SearchView
import android.widget.SearchView.OnQueryTextListener

...

val searchview :SearchView = findViewById(R.id.search_view)
        searchview.setOnQueryTextListener(object:SearchView.OnQueryTextListener{
            override fun onQueryTextSubmit(query: String?): Boolean {
                return false
            }

            override fun onQueryTextChange(newText: String?): Boolean {
                adapter.filter.filter(newText)
                return false
            }
        })

...

getFilter()

override fun getFilter(): Filter {
            return object : Filter() {
                override fun performFiltering(charSequence: CharSequence): FilterResults {
                    val charString = charSequence.toString()
                    if (charString.isEmpty()) {
                        searchList = itemList
                    } else {
                        val filteredList = ArrayList<CoinList>()

                        for (coin in itemList) {
                            if (coin.name.contains(charString)) {
                                filteredList.add(coin)
                            }
                        }
                        searchList = filteredList
                    }
                    val filterResults = FilterResults()
                    filterResults.values = searchList
                    return filterResults
                }

                override fun publishResults(
                    charSequence: CharSequence,
                    filterResults: FilterResults
                ) {
                    searchList = filterResults.values as ArrayList<CoinList>
                    notifyDataSetChanged()
                }
            }
        }

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<com.sothree.slidinguppanel.SlidingUpPanelLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@ id/mainFrame"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="bottom"
    app:umanoDragView="@id/slide_layout"
    app:umanoPanelHeight="16dp"
    tools:context=".MainActivity">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:id="@ id/first_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <androidx.appcompat.widget.SearchView
            android:id="@ id/search_view"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:layout_constraintBottom_toTopOf="@id/recyclerview"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/inside_layout"/>

    </androidx.constraintlayout.widget.ConstraintLayout>

</com.sothree.slidinguppanel.SlidingUpPanelLayout>

I don't know what is my fault. How can I solve this?

CodePudding user response：

In your imports,

Replace

import android.widget.SearchView

With

import androidx.appcompat.widget.SearchView

CodePudding user response：

In xml, you use androidx SearchView

 androidx.appcompat.widget.SearchView

but in your kotlin code you android.widget.SearchView

import android.widget.SearchView

That's why can't cast