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BasicMapActivity.kt
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BasicMapActivity.kt
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// Copyright 2021 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 android.util.Log
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.animation.AnimatedVisibility
import androidx.compose.animation.EnterTransition
import androidx.compose.animation.fadeOut
import androidx.compose.foundation.ScrollState
import androidx.compose.foundation.background
import androidx.compose.foundation.horizontalScroll
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.wrapContentSize
import androidx.compose.material.Button
import androidx.compose.material.ButtonDefaults
import androidx.compose.material.CircularProgressIndicator
import androidx.compose.material.MaterialTheme
import androidx.compose.material.Switch
import androidx.compose.material.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.rememberCoroutineScope
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.platform.testTag
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp
import com.google.android.gms.maps.CameraUpdateFactory
import com.google.android.gms.maps.model.BitmapDescriptorFactory
import com.google.android.gms.maps.model.CameraPosition
import com.google.android.gms.maps.model.LatLng
import com.google.android.gms.maps.model.Marker
import com.google.maps.android.compose.theme.MapsComposeSampleTheme
import kotlinx.coroutines.launch
private const val TAG = "BasicMapActivity"
val singapore = LatLng(1.35, 103.87)
val singapore2 = LatLng(1.40, 103.77)
val singapore3 = LatLng(1.45, 103.77)
val defaultCameraPosition = CameraPosition.fromLatLngZoom(singapore, 11f)
class BasicMapActivity : ComponentActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContent {
var isMapLoaded by remember { mutableStateOf(false) }
// Observing and controlling the camera's state can be done with a CameraPositionState
val cameraPositionState = rememberCameraPositionState {
position = defaultCameraPosition
}
Box(Modifier.fillMaxSize()) {
GoogleMapView(
modifier = Modifier.matchParentSize(),
cameraPositionState = cameraPositionState,
onMapLoaded = {
isMapLoaded = true
},
)
if (!isMapLoaded) {
AnimatedVisibility(
modifier = Modifier
.matchParentSize(),
visible = !isMapLoaded,
enter = EnterTransition.None,
exit = fadeOut()
) {
CircularProgressIndicator(
modifier = Modifier
.background(MaterialTheme.colors.background)
.wrapContentSize()
)
}
}
}
}
}
}
@Composable
fun GoogleMapView(
modifier: Modifier = Modifier,
cameraPositionState: CameraPositionState = rememberCameraPositionState(),
onMapLoaded: () -> Unit = {},
content: @Composable () -> Unit = {}
) {
val singaporeState = rememberMarkerState(position = singapore)
val singapore2State = rememberMarkerState(position = singapore2)
val singapore3State = rememberMarkerState(position = singapore3)
var circleCenter by remember { mutableStateOf(singapore) }
if (singaporeState.dragState == DragState.END) {
circleCenter = singaporeState.position
}
var uiSettings by remember { mutableStateOf(MapUiSettings(compassEnabled = false)) }
var shouldAnimateZoom by remember { mutableStateOf(true) }
var ticker by remember { mutableStateOf(0) }
var mapProperties by remember {
mutableStateOf(MapProperties(mapType = MapType.NORMAL))
}
var mapVisible by remember { mutableStateOf(true) }
if (mapVisible) {
GoogleMap(
modifier = modifier,
cameraPositionState = cameraPositionState,
properties = mapProperties,
uiSettings = uiSettings,
onMapLoaded = onMapLoaded,
onPOIClick = {
Log.d(TAG, "POI clicked: ${it.name}")
}
) {
// Drawing on the map is accomplished with a child-based API
val markerClick: (Marker) -> Boolean = {
Log.d(TAG, "${it.title} was clicked")
cameraPositionState.projection?.let { projection ->
Log.d(TAG, "The current projection is: $projection")
}
false
}
MarkerInfoWindowContent(
state = singaporeState,
title = "Zoom in has been tapped $ticker times.",
onClick = markerClick,
draggable = true,
) {
Text(it.title ?: "Title", color = Color.Red)
}
MarkerInfoWindowContent(
state = singapore2State,
title = "Marker with custom info window.\nZoom in has been tapped $ticker times.",
icon = BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_BLUE),
onClick = markerClick,
) {
Text(it.title ?: "Title", color = Color.Blue)
}
Marker(
state = singapore3State,
title = "Marker in Singapore",
onClick = markerClick
)
Circle(
center = circleCenter,
fillColor = MaterialTheme.colors.secondary,
strokeColor = MaterialTheme.colors.secondaryVariant,
radius = 1000.0,
)
content()
}
}
Column {
MapTypeControls(onMapTypeClick = {
Log.d("GoogleMap", "Selected map type $it")
mapProperties = mapProperties.copy(mapType = it)
})
Row {
MapButton(
text = "Reset Map",
onClick = {
mapProperties = mapProperties.copy(mapType = MapType.NORMAL)
cameraPositionState.position = defaultCameraPosition
singaporeState.position = singapore
singaporeState.hideInfoWindow()
}
)
MapButton(
text = "Toggle Map",
onClick = { mapVisible = !mapVisible },
modifier = Modifier.testTag("toggleMapVisibility"),
)
}
val coroutineScope = rememberCoroutineScope()
ZoomControls(
shouldAnimateZoom,
uiSettings.zoomControlsEnabled,
onZoomOut = {
if (shouldAnimateZoom) {
coroutineScope.launch {
cameraPositionState.animate(CameraUpdateFactory.zoomOut())
}
} else {
cameraPositionState.move(CameraUpdateFactory.zoomOut())
}
},
onZoomIn = {
if (shouldAnimateZoom) {
coroutineScope.launch {
cameraPositionState.animate(CameraUpdateFactory.zoomIn())
}
} else {
cameraPositionState.move(CameraUpdateFactory.zoomIn())
}
ticker++
},
onCameraAnimationCheckedChange = {
shouldAnimateZoom = it
},
onZoomControlsCheckedChange = {
uiSettings = uiSettings.copy(zoomControlsEnabled = it)
}
)
DebugView(cameraPositionState, singaporeState)
}
}
@Composable
private fun MapTypeControls(
onMapTypeClick: (MapType) -> Unit
) {
Row(
Modifier
.fillMaxWidth()
.horizontalScroll(state = ScrollState(0)),
horizontalArrangement = Arrangement.Center
) {
MapType.values().forEach {
MapTypeButton(type = it) { onMapTypeClick(it) }
}
}
}
@Composable
private fun MapTypeButton(type: MapType, onClick: () -> Unit) =
MapButton(text = type.toString(), onClick = onClick)
@Composable
private fun ZoomControls(
isCameraAnimationChecked: Boolean,
isZoomControlsEnabledChecked: Boolean,
onZoomOut: () -> Unit,
onZoomIn: () -> Unit,
onCameraAnimationCheckedChange: (Boolean) -> Unit,
onZoomControlsCheckedChange: (Boolean) -> Unit,
) {
Row(Modifier.fillMaxWidth(), horizontalArrangement = Arrangement.Center) {
MapButton("-", onClick = { onZoomOut() })
MapButton("+", onClick = { onZoomIn() })
Column(verticalArrangement = Arrangement.Center) {
Text(text = "Camera Animations On?")
Switch(
isCameraAnimationChecked,
onCheckedChange = onCameraAnimationCheckedChange,
modifier = Modifier.testTag("cameraAnimations"),
)
Text(text = "Zoom Controls On?")
Switch(
isZoomControlsEnabledChecked,
onCheckedChange = onZoomControlsCheckedChange
)
}
}
}
@Composable
private fun MapButton(text: String, onClick: () -> Unit, modifier: Modifier = Modifier) {
Button(
modifier = modifier.padding(4.dp),
colors = ButtonDefaults.buttonColors(
backgroundColor = MaterialTheme.colors.onPrimary,
contentColor = MaterialTheme.colors.primary
),
onClick = onClick
) {
Text(text = text, style = MaterialTheme.typography.body1)
}
}
@Composable
private fun DebugView(
cameraPositionState: CameraPositionState,
markerState: MarkerState
) {
Column(
Modifier
.fillMaxWidth(),
verticalArrangement = Arrangement.Center
) {
val moving =
if (cameraPositionState.isMoving) "moving" else "not moving"
Text(text = "Camera is $moving")
Text(text = "Camera position is ${cameraPositionState.position}")
Spacer(modifier = Modifier.height(4.dp))
val dragging =
if (markerState.dragState == DragState.DRAG) "dragging" else "not dragging"
Text(text = "Marker is $dragging")
Text(text = "Marker position is ${markerState.position}")
}
}
@Preview
@Composable
fun GoogleMapViewPreview() {
MapsComposeSampleTheme {
GoogleMapView(Modifier.fillMaxSize())
}
}