Android kotlin 用RecyclerView(androidx+BRVAH3.0.6)实现仿微信长按列表弹出菜单功能

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
    }
}

2、弹出菜单：implementation 'com.noober.floatmenu:common:1.0.4'

三、实现源码

1、适配器

RvAdapter.kt

package com.example.myapplication3.adapter

import com.chad.library.adapter.base.BaseQuickAdapter
import com.chad.library.adapter.base.viewholder.BaseViewHolder
import com.noober.floatmenu.R
import kotlinx.android.synthetic.main.item.view.*

class RvAdapter(layoutResId: Int = R.layout.item) :
    BaseQuickAdapter<String, BaseViewHolder>(layoutResId) {
    override fun convert(holder: BaseViewHolder, item: String) {
        holder.itemView.run {
            tv_content.text = item
        }
    }
}

item布局item.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/swipe_menu_layout"
    android:layout_width="match_parent"
    android:layout_height="50dp"
    android:background="@drawable/item_bg"
    android:gravity="center">

    <TextView
        android:id="@+id/tv_content"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="菜单" />
LinearLayout>

item样式item_bg.xml，点住前后item的颜色不同

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true">
        <shape android:shape="rectangle">
            <stroke android:width="1.0px" android:color="@color/line" />

            <gradient android:angle="270.0" android:endColor="#ffe8ecef" android:startColor="#ffe8ecef" />
        shape>
    item>

    <item android:state_focused="true">
        <shape android:shape="rectangle">
            <gradient android:angle="270.0" android:endColor="#ffe8ecef" android:startColor="#ffe8ecef" />

            <stroke android:width="1.0px" android:color="@color/line" />
        shape>
    item>

    <item>
        <shape android:shape="rectangle">
            <gradient android:angle="270.0" android:endColor="#ffffffff" android:startColor="#ffffffff" />

            <stroke android:width="1.0px" android:color="@color/line" />
        shape>
    item>

selector>

2、实现视图

MainActivity.kt

package com.noober.floatmenu

import android.graphics.Point
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import com.noober.menu.FloatMenu
import android.widget.Toast
import android.view.MotionEvent
import androidx.recyclerview.widget.LinearLayoutManager
import com.chad.library.adapter.base.BaseQuickAdapter
import com.chad.library.adapter.base.listener.OnItemLongClickListener
import com.example.myapplication3.adapter.RvAdapter
import java.util.ArrayList
import kotlinx.android.synthetic.main.activity_main.*;

class MainActivity : AppCompatActivity(), OnItemLongClickListener {

    private val point = Point()

    private val mAdapter by lazy {
        RvAdapter().apply {
            setOnItemLongClickListener(this@MainActivity)
        }
    }

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

    private fun init() {
        val itemList: MutableList<String> = ArrayList()
        for (i in 0..19) {
            itemList.add("菜单$i")
        }
        val layoutManager = LinearLayoutManager(this@MainActivity)
        layoutManager.orientation = LinearLayoutManager.VERTICAL
        recyclerView.layoutManager = layoutManager
        recyclerView.adapter = mAdapter
        mAdapter.setList(itemList)
    }

    override fun dispatchTouchEvent(ev: MotionEvent): Boolean {
        if (ev.action == MotionEvent.ACTION_DOWN) {
            point.x = ev.rawX.toInt()
            point.y = ev.rawY.toInt()
        }
        return super.dispatchTouchEvent(ev)
    }

    override fun onItemLongClick(adapter: BaseQuickAdapter<*, *>, view: View, position: Int): Boolean {
        val floatMenu = FloatMenu(this@MainActivity)
        floatMenu.items("菜单1", "菜单2", "菜单3")
        floatMenu.show(point)
        floatMenu.setOnItemClickListener { v, position ->
            Toast.makeText(this@MainActivity,"$position", Toast.LENGTH_SHORT).show()
        }
        return true
    }
}

activity_main.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

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