WmsTileOverlayActivity.kt

/*
 * Copyright 2026 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.maps.android.compose

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.padding
import androidx.compose.material3.Button
import androidx.compose.material3.Text
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp
import com.google.android.gms.maps.model.CameraPosition
import com.google.android.gms.maps.model.LatLng
import com.google.maps.android.compose.wms.WmsTileOverlay
import androidx.core.net.toUri

/**
 * This activity demonstrates how to use [WmsTileOverlay] to display a Web Map Service (WMS)
 * layer on a map.
 */
class WmsTileOverlayActivity : ComponentActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            val center = LatLng(39.50, -98.35) // Center of US
            val cameraPositionState = rememberCameraPositionState {
                position = CameraPosition.fromLatLngZoom(center, 4f)
            }
            var mapType by remember { mutableStateOf(MapType.NORMAL) }
            var overlayVisible by remember { mutableStateOf(true) }

            Box(modifier = Modifier.fillMaxSize()) {
                GoogleMap(
                    modifier = Modifier.fillMaxSize(),
                    cameraPositionState = cameraPositionState,
                    properties = MapProperties(mapType = mapType)
                ) {
                // Example: USGS National Map Shaded Relief (WMS)
                WmsTileOverlay(
                    urlFormatter = { xMin, yMin, xMax, yMax, _ ->
                        "https://basemap.nationalmap.gov/arcgis/services/USGSShadedReliefOnly/MapServer/WmsServer".toUri()
                            .buildUpon()
                            .appendQueryParameter("SERVICE", "WMS")
                            .appendQueryParameter("VERSION", "1.1.1")
                            .appendQueryParameter("REQUEST", "GetMap")
                            .appendQueryParameter("FORMAT", "image/png")
                            .appendQueryParameter("TRANSPARENT", "true")
                            .appendQueryParameter("LAYERS", "0")
                            .appendQueryParameter("SRS", "EPSG:3857")
                            .appendQueryParameter("WIDTH", "256")
                            .appendQueryParameter("HEIGHT", "256")
                            .appendQueryParameter("STYLES", "")
                            .appendQueryParameter("BBOX", "$xMin,$yMin,$xMax,$yMax")
                            .build()
                            .toString()
                    },
                    transparency = 0.5f,
                    visible = overlayVisible
                )
            }

            Column(
                modifier = Modifier
                    .align(Alignment.TopEnd)
                    .padding(16.dp),
                verticalArrangement = Arrangement.spacedBy(8.dp)
            ) {
                Button(
                    onClick = {
                        mapType = if (mapType == MapType.NONE) MapType.NORMAL else MapType.NONE
                    }
                ) {
                    Text(if (mapType == MapType.NONE) "Show Base Map" else "Hide Base Map")
                }

                Button(
                    onClick = {
                        overlayVisible = !overlayVisible
                    }
                ) {
                    Text(if (overlayVisible) "Hide WMS Overlay" else "Show WMS Overlay")
                }
            }
        }
    }
    }
}