Android Compose 实现PopupMenu

package com.example.compose_menu_pop

import androidx.compose.foundation.LocalIndication
import androidx.compose.foundation.gestures.detectTapGestures
import androidx.compose.foundation.indication
import androidx.compose.foundation.interaction.MutableInteractionSource
import androidx.compose.foundation.interaction.PressInteraction
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.padding
import androidx.compose.material3.*
import androidx.compose.runtime.Composable
import androidx.compose.runtime.*
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.ui.Modifier
import androidx.compose.ui.input.pointer.pointerInput
import androidx.compose.ui.layout.onSizeChanged
import androidx.compose.ui.platform.LocalDensity
import androidx.compose.ui.unit.DpOffset
import androidx.compose.ui.unit.dp


data class DropDownItem(
    val text: String
)

@OptIn(ExperimentalMaterial3Api::class)
@Composable
fun PersonItem(
    personName: String,
    dropDownItems: List,
    modifier: Modifier = Modifier,
    onItemClick: (DropDownItem) -> Unit
) {
    var isContextMenuVisible by rememberSaveable {
        mutableStateOf(false)
    }

    var pressOffset by remember {
        mutableStateOf(DpOffset.Zero)
    }

    var itemHeight by remember {
        mutableStateOf(0.dp)
    }

    val interactionSource = remember {
        MutableInteractionSource()
    }

    val density = LocalDensity.current

    Card(elevation = CardDefaults.cardElevation(defaultElevation = 4.dp),
        modifier = modifier.onSizeChanged {
            itemHeight = with(density) { it.height.toDp() }
        }) {
        Box(modifier = Modifier
            .fillMaxWidth()
            .indication(interactionSource, LocalIndication.current)
            .pointerInput(true) {
                detectTapGestures(onLongPress = {
                    isContextMenuVisible = true
                    pressOffset = DpOffset(it.x.toDp(), it.y.toDp())

                }, onPress = {
              
//                    水波纹的点击没了。为了还原水波纹的点击
                    val press = PressInteraction.Press(it)
                    interactionSource.emit(press)
                    tryAwaitRelease()
                    interactionSource.emit(PressInteraction.Release(press))
                })
            }
            .padding(16.dp)) {

            Text(text = personName)

        }

        DropdownMenu(expanded = isContextMenuVisible,
            offset = pressOffset.copy(y = pressOffset.y - itemHeight),
            onDismissRequest = {
                isContextMenuVisible = false
            }) {

            dropDownItems.forEach { item ->
                DropdownMenuItem(text = {
                    Text(item.text)
                }, onClick = {
                    onItemClick(item)
                    isContextMenuVisible = false
                })
            }

        }

    }


}

长按这里就会弹出来 也可以根据自己的需求 换成单机 或者没有条目

package com.example.compose_menu_pop

import android.os.Bundle
import android.widget.Toast
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.foundation.lazy.items
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 androidx.compose.ui.unit.dp
import com.example.compose_menu_pop.ui.theme.Compose_menu_popTheme

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            Compose_menu_popTheme {
                LazyColumn(
                    modifier = Modifier.fillMaxSize(),
                    verticalArrangement = Arrangement.spacedBy(16.dp)
                ) {
                    items(listOf("Phild", "Jaca", "djlkasjd", "asd")) { name ->
                        PersonItem(personName = name, dropDownItems = listOf(
                            DropDownItem("Item1"),
                            DropDownItem("Item2"),
                            DropDownItem("Item3"),
                        ), onItemClick = {
                            Toast.makeText(applicationContext, it.text, Toast.LENGTH_LONG).show()
                        })

                    }
                }
            }
        }
    }
}