如何解决 androidx.appcompat.widget.SearchView 无法转换为 android.widget.SearchView

Question

我知道有很多关于这个错误的问题。尝试了许多解决方案，我意识到我的情况有所不同。有人可以帮忙吗？ 我尝试将searchview 应用到recyclerview，并在reyclerview adapter 中插入filter()，在mainactivity 中插入setOnQueryTextListener。

但我收到以下错误： 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>

我不知道是我的错。我该如何解决这个问题？

Answer 1

在您的导入中，

替换

import android.widget.SearchView

有

import androidx.appcompat.widget.SearchView

Answer 2

在xml中，你使用androidx SearchView

 androidx.appcompat.widget.SearchView

但是在你的 kotlin 代码中你是 android.widget.SearchView

import android.widget.SearchView

这就是为什么不能施放