官方文档Dialog

package com.demo.composestudy

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.background
import androidx.compose.foundation.layout.*
import androidx.compose.material3.*
import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.tooling.preview.Preview
import com.demo.composestudy.ui.theme.ComposeStudyTheme
import androidx.compose.ui.unit.*
import androidx.compose.runtime.*
import androidx.compose.ui.graphics.*
import androidx.compose.foundation.Image
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.Info
import androidx.compose.ui.platform.LocalContext
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch

import android.util.Log;

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            DialogDemo()
        }

    }
}

@Composable
fun DialogDemo(){
    var showDialog by remember { mutableStateOf(false) }
    Button(
        onClick = {showDialog = !showDialog}){
        Text("显示AlertDialog")
    }
    if(showDialog){
        AlertDialog(
            icon = {
                Icon(Icons.Default.Info, contentDescription = "默认提示图标")
            },

            title = {
                Text(text = "标题")
            },
            text = {
                Text(text = "内容内容内容内容内容内容")
            },

            onDismissRequest = {
                Log.d("MainActivityAlertDialog","关闭对话框时触发")
            },

            confirmButton = {
                TextButton(
                    onClick = {
                        showDialog = false
                    }
                ) {
                    Text("确认")
                }
            },
            dismissButton = {
                TextButton(
                    onClick = {
                        showDialog = false
                    }
                ) {
                    Text("取消")
                }
            }
        )
    }
}