在自定义listView中搜索，从工具栏- Kotlin

// 导入必要的类
import android.os.Bundle
import android.text.Editable
import android.text.TextWatcher
import android.widget.ArrayAdapter
import android.widget.ListView
import androidx.appcompat.app.AppCompatActivity
import com.google.android.material.textfield.TextInputEditText

class MainActivity : AppCompatActivity() {
    private lateinit var searchEditText: TextInputEditText
    private lateinit var listView: ListView
    private lateinit var adapter: ArrayAdapter<String>
    private lateinit var originalList: ArrayList<String>
    private lateinit var searchList: ArrayList<String>

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        // 初始化控件
        searchEditText = findViewById(R.id.searchEditText)
        listView = findViewById(R.id.listView)

        // 创建原始数据列表
        originalList = ArrayList()
        originalList.add("Apple")
        originalList.add("Banana")
        originalList.add("Cherry")
        originalList.add("Durian")
        originalList.add("Grape")
        originalList.add("Lemon")
        originalList.add("Orange")
        originalList.add("Watermelon")

        // 创建适配器
        adapter = ArrayAdapter(this, android.R.layout.simple_list_item_1, originalList)
        listView.adapter = adapter

        // 创建搜索结果列表
        searchList = ArrayList()

        // 设置搜索框的监听器
        searchEditText.addTextChangedListener(object : TextWatcher {
            override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {}

            override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
                // 清空搜索结果列表
                searchList.clear()

                // 获取用户输入的关键词
                val keyword = s.toString()

                // 遍历原始列表进行搜索
                for (item in originalList) {
                    if (item.contains(keyword, ignoreCase = true)) {
                        searchList.add(item)
                    }
                }

                // 更新ListView的数据源为搜索结果列表
                adapter.clear()
                adapter.addAll(searchList)

                // 刷新ListView
                adapter.notifyDataSetChanged()
            }

            override fun afterTextChanged(s: Editable?) {}
        })
    }
}