Android一个简单带动画的展开收起功能

在Android上，布局的显示和隐藏往往很生硬，给人体验不好，本文使用 android:animateLayoutChanges属性，使得体验效果瞬间提升一个档次。

1、效果如下：

2、具体代码如下：

package com.zw.demo20230928

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.LinearLayout
import android.widget.TextView
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView

class MainActivity : AppCompatActivity() {

    private lateinit var llTitle: LinearLayout
    private lateinit var recyclerView: RecyclerView
    private lateinit var tvTitle: TextView
    private val data =ArrayList<String>()

    private var isClick =false;
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        recyclerView = findViewById(R.id.recyclerView)
        llTitle = findViewById(R.id.ll_title)
        tvTitle = findViewById(R.id.tv_title)
        llTitle.setOnClickListener {
            isClick = !isClick
            if (isClick){
                tvTitle.text = "收起"
                recyclerView.visibility = View.VISIBLE
            }else{
                tvTitle.text = "展开"
                recyclerView.visibility = View.GONE
            }

        }
        var manager=LinearLayoutManager(this)
        manager.orientation =LinearLayoutManager.VERTICAL
        recyclerView.layoutManager =manager
        recyclerView.adapter =object :RecyclerView.Adapter<RecyclerView.ViewHolder>() {
            override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
                val v = LayoutInflater.from(recyclerView.context).inflate(R.layout.item_test, parent, false)
                return object : RecyclerView.ViewHolder(v){
                }
            }

            override fun getItemCount(): Int {
                return data.size
            }

            override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
                holder.itemView.findViewById<TextView>(R.id.tv_name).text = data[position]
            }
        }
        initData()
    }

    private fun initData(){
        data.add("内容----1")
        data.add("内容----2")
        data.add("内容----3")
        data.add("内容----4")
        data.add("内容----5")
        data.add("内容----6")
    }
}
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