Jetpack Compose集成Google Map时标记与相机位置无法显示问题求助

我在Android上使用Jetpack Compose开发地图功能时，遇到了地图标记和相机位置无法正常显示的问题。

我严格遵循了官方文档的教程步骤，但始终无法让功能正常工作——我完全照着教程里的内容来写，实在摸不清问题出在哪。

目前的情况是：地图上看不到设置的标记，相机也没有定位到指定的位置。我觉得应该不是API密钥的问题，因为没有收到任何相关的警告或错误提示。

以下是我的代码：

import android.content.Context
import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.material.MaterialTheme
import androidx.compose.material.Surface
import androidx.compose.material.Switch
import androidx.compose.runtime.*
import androidx.compose.ui.Modifier
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.tooling.preview.Preview
import com.example.citylife.ui.theme.CityLifeTheme
import com.google.android.gms.maps.model.CameraPosition
import com.google.android.gms.maps.model.LatLng
import com.google.maps.android.compose.*

class MapActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            CityLifeTheme {
                // A surface container using the 'background' color from the theme
                Surface(modifier = Modifier.fillMaxSize(), color = MaterialTheme.colors.background) {
                    MapElement(applicationContext)
                }
            }
        }
    }
}

@Composable
fun MapElement(context: Context) {
    val singapore = LatLng(1.35, 103.87)
    val singaporeState = MarkerState(position = singapore)
    val cameraPositionState = rememberCameraPositionState {
        position = CameraPosition.fromLatLngZoom(singapore, 10f)
    }

    GoogleMap(
        modifier = Modifier.fillMaxSize(),
        cameraPositionState = cameraPositionState
    ) {
        Marker(
            state = singaporeState,
            title = "Singapore",
            snippet = "Marker for singapore"
        )
    }

    var uiSettings by remember { mutableStateOf(MapUiSettings()) }
    val properties by remember {
        mutableStateOf(MapProperties(mapType = MapType.NORMAL))
    }

    Box(Modifier.fillMaxSize()) {
        GoogleMap(
            modifier = Modifier.matchParentSize(),
            properties = properties,
            uiSettings = uiSettings
        )
        Switch(
            checked = uiSettings.zoomControlsEnabled,
            onCheckedChange = {
                uiSettings = uiSettings.copy(zoomControlsEnabled = it)
            }
        )
    }
}

有没有大佬能给我一些排查的建议？提前谢谢大家了！

备注：内容来源于stack exchange，提问作者Andrea Catani