Compose,消息列表和动画（点击item的时候，就会删除）

package com.example.mycompose08import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Surface
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier
import androidx.compose.ui.tooling.preview.Preview
import com.example.mycompose08.ui.theme.MyApplicationThemeimport androidx.compose.animation.*
import androidx.compose.foundation.clickable
import androidx.compose.foundation.layout.*
import androidx.compose.foundation.lazy.*
import androidx.compose.material3.*
import androidx.compose.material3.Card
import androidx.compose.runtime.*
import androidx.compose.ui.*
import androidx.compose.ui.unit.*class MainActivity : ComponentActivity() {override fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)setContent {MyApplicationTheme {// A surface container using the 'background' color from the themeSurface(modifier = Modifier.fillMaxSize(),color = MaterialTheme.colorScheme.background) {AnimatedList()}}}}
}// 定义一个可组合函数，用于显示一个列表
@Composable
fun AnimatedList() {// 创建一个状态变量，用于存储列表的数据val list = remember { mutableStateListOf("Apple", "Banana", "Cherry","先天下之优而优","后天下之乐而乐") }// 创建一个懒加载列表，用于显示列表的每一项LazyColumn(modifier = Modifier.fillMaxSize(),contentPadding = PaddingValues(16.dp)) {// 遍历列表的数据，为每一项创建一个可组合函数items(list) { item ->// 使用AnimatedVisibility函数，根据列表项是否可见来添加淡入淡出的动画效果AnimatedVisibility(visible = list.contains(item),enter = fadeIn(),exit = fadeOut()) {// 使用Card函数，创建一个卡片样式的列表项Card(modifier = Modifier.fillMaxWidth().padding(8.dp).clickable {// 点击卡片时，从列表中移除该项list.remove(item)},//elevation = 4.dp
//                    shadowElevation = 4.dp) {// 在卡片中显示列表项的文本内容Text(text = item,modifier = Modifier.padding(16.dp),fontSize = 24.sp)}}}}
}@Preview(showBackground = true)
@Composable
fun GreetingPreview() {MyApplicationTheme {AnimatedList()}
}