一、实现效果

二、引入依赖

在app的build.gradle在添加以下代码
1、implementation 'com.github.CymChad:BaseRecyclerViewAdapterHelper:3.0.6'，这个里面带的适配器，直接调用就即可

BaseRecyclerViewAdapterHelper简称BRVAH

Android SDK	是否支持BaseRecyclerViewAdapterHelper:3.0.6
android compileSdkVersion 29	是
android compileSdkVersion 30	是
android compileSdkVersion 31	是
android compileSdkVersion 32	是
android compileSdkVersion 33	是

这依赖包还需要得到要添加，在Project的build.gradle在添加以下代码，不添加就不行

allprojects {
    repositories {
        ...
        maven { url "https://jitpack.io" }//加上
    }
}

三、实现源码

1、文字变色工具类

KeyWordUtil.kt

package com.example.myapplication3.util

import android.text.SpannableString
import android.text.Spanned
import android.text.TextUtils
import android.text.style.ForegroundColorSpan
import java.util.regex.Matcher
import java.util.regex.Pattern


object KeyWordUtil {
    /**
     * 关键字高亮变色
     *
     * @param color   变化的色值
     * @param text    文字
     * @param keyword 文字中的关键字
     * @return 结果SpannableString
     */
    fun matcherSearchTitle(color: Int, text: String, keyword: String): SpannableString {
        var text = text
        var keyword = keyword
        val s = SpannableString(text)
        keyword = escapeExprSpecialWord(keyword)
        text = escapeExprSpecialWord(text)
        if (text.contains(keyword) && !TextUtils.isEmpty(keyword)) {
            try {
                val p: Pattern = Pattern.compile(keyword)
                val m: Matcher = p.matcher(s)
                while (m.find()) {
                    val start: Int = m.start()
                    val end: Int = m.end()
                    s.setSpan(
                        ForegroundColorSpan(color),
                        start,
                        end,
                        Spanned.SPAN_EXCLUSIVE_EXCLUSIVE
                    )
                }
            } catch (e: Exception) {
            }
        }
        return s
    }

    /**
     * 转义正则特殊字符 （$()*+.[]?\^{},|）
     *
     * @param keyword
     * @return keyword
     */
    private fun escapeExprSpecialWord(keyword: String): String {
        var keyword = keyword
        if (!TextUtils.isEmpty(keyword)) {
            val fbsArr =
                arrayOf("\\", "$", "(", ")", "*", "+", ".", "[", "]", "?", "^", "{", "}", "|")
            for (key in fbsArr) {
                if (keyword.contains(key)) {
                    keyword = keyword.replace(key, "\\" + key)
                }
            }
        }
        return keyword
    }
}

2、实体类

User.java

package com.example.myapplication3.Bean;

public class User {
    Integer id;   //Id
    String number;//账号
    String nick;  //昵称

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getNumber() {
        return number;
    }

    public void setNumber(String number) {
        this.number = number;
    }

    public String getNick() {
        return nick;
    }

    public void setNick(String nick) {
        this.nick = nick;
    }

    public User() {
        super();
    }

    public User(Integer id, String number, String nick) {
        super();
        this.id = id;
        this.number = number;
        this.nick = nick;
    }
}

3、适配器

搜索的列表适配器SearchRvAdapter.kt

package com.example.myapplication3.adapter

import com.chad.library.adapter.base.BaseQuickAdapter
import com.chad.library.adapter.base.viewholder.BaseViewHolder
import com.example.myapplication3.Bean.User
import com.example.myapplication3.R

class SearchRvAdapter(layoutResId: Int = R.layout.search_rv_item) : BaseQuickAdapter<User, BaseViewHolder>(layoutResId) {

    override fun convert(holder: BaseViewHolder, item: User) {

        if (mCallBack != null) {
            mCallBack!!.convert(holder, item);
        }
    }

    //回调
    private var mCallBack: ItemSelectedCallBack? = null

    fun setItemSelectedCallBack(CallBack: ItemSelectedCallBack?) {
        mCallBack = CallBack
    }

    interface ItemSelectedCallBack {
        fun convert(holder: BaseViewHolder?, item:User)
    }
}

item布局search_rv_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
    <TextView
        android:id="@+id/search_rv_item_tv_userNumber"
        android:layout_width="wrap_content"
        android:layout_height="30dp"
        android:layout_marginLeft="20dp"
        android:gravity="center"
        android:text="123456"
        android:textColor="#666"
        android:textSize="16sp" />

    <TextView
        android:id="@+id/search_rv_item_tv_userNick"
        android:layout_width="wrap_content"
        android:layout_height="30dp"
        android:layout_marginLeft="20dp"
        android:gravity="center"
        android:textColor="#666"
        android:textSize="16sp"
        android:text="小彬"/>
    </LinearLayout>

    <View
        android:layout_width="match_parent"
        android:layout_height="0.5dp"
        android:background="@color/red" />
</LinearLayout>

4、实现视图

MainActivity.kt

package com.example.myapplication3

import android.content.Context
import android.graphics.Color
import android.os.Bundle
import android.text.SpannableString
import android.view.inputmethod.InputMethodManager
import androidx.appcompat.app.AppCompatActivity
import androidx.recyclerview.widget.LinearLayoutManager
import com.chad.library.adapter.base.viewholder.BaseViewHolder
import com.example.myapplication3.Bean.User
import com.example.myapplication3.adapter.SearchRvAdapter
import com.example.myapplication3.util.KeyWordUtil
import kotlinx.android.synthetic.main.activity_main.*
import kotlinx.android.synthetic.main.search_rv_item.view.*


class MainActivity : AppCompatActivity() {

    private val mAdapter by lazy {
        SearchRvAdapter()
    }

    //用户输入的搜索内容
    private var searchContent = ""

    //用户集合
    private var mUserList: MutableList<User> = ArrayList()

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

    private fun init() {
        val layoutManager = LinearLayoutManager(this@MainActivity)
        layoutManager.orientation = LinearLayoutManager.VERTICAL
        recyclerview.layoutManager = layoutManager
        recyclerview.adapter = mAdapter

        mAdapter.setItemSelectedCallBack(object : SearchRvAdapter.ItemSelectedCallBack {

            override fun convert(holder: BaseViewHolder?, item: User) {

                //设置控件的值
                //搜索高亮显示
                if (item.number != null && item.number.length > 0) {

                    val number: SpannableString = KeyWordUtil.matcherSearchTitle(
                        Color.parseColor("#F44336"),
                        item.number + "",
                        searchContent
                    )

                    holder!!.itemView.run { search_rv_item_tv_userNumber.text = number }
                }
                if (item.nick != null && item.nick.length > 0) {
                    val nick: SpannableString = KeyWordUtil.matcherSearchTitle(
                        Color.parseColor("#F44336"),
                        item.nick,
                        searchContent
                    )
                    holder!!.itemView.run { search_rv_item_tv_userNick.text = nick }
                }
            }
        })

        //点击搜索框
        search_editText_searchContent.setOnClickListener {
            search_editText_searchContent.isFocusable = true;
            search_editText_searchContent.isFocusableInTouchMode = true;
            search_editText_searchContent.requestFocus();
            val imm = getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
            imm.showSoftInput(search_editText_searchContent, 0);
        }

        //点击搜索
        btn_search.setOnClickListener {

            if (mAdapter.data.size > 0) {
                mUserList.clear()
            }

            //获取用户搜索的内容
            searchContent = search_editText_searchContent.text.toString()
            mAdapter.notifyDataSetChanged()

            //初始化一些数据（实际开发中，是去数据库中读取）
            val u1 = User(1, "4473983", "小红");
            mUserList.add(u1);
            val u2 = User(2, "8493940", "小李");
            mUserList.add(u2);
            val u3 = User(3, "0907443", "小彬");
            mUserList.add(u3);
            val u4 = User(4, "8949344", "张小");
            mUserList.add(u4)
            mAdapter.setList(mUserList)
        }
    }
}

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <EditText
            android:id="@+id/search_editText_searchContent"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1" />

        <Button
            android:id="@+id/btn_search"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:text="搜索" />
    </LinearLayout>

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerview"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
</LinearLayout>