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ScaleBarActivity.kt
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ScaleBarActivity.kt
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// Copyright 2022 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.animation.AnimatedVisibility
import androidx.compose.animation.EnterTransition
import androidx.compose.animation.fadeOut
import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.wrapContentSize
import androidx.compose.material.CircularProgressIndicator
import androidx.compose.material.MaterialTheme
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.widgets.DisappearingScaleBar
import com.google.maps.android.compose.widgets.ScaleBar
private const val TAG = "ScaleBarActivity"
private const val zoom = 8f
class ScaleBarActivity : ComponentActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContent {
var isMapLoaded by remember { mutableStateOf(false) }
// To control and observe the map camera
val cameraPositionState = rememberCameraPositionState {
position = defaultCameraPosition
}
Box(Modifier.fillMaxSize()) {
GoogleMap(
modifier = Modifier.matchParentSize(),
cameraPositionState = cameraPositionState,
onMapLoaded = {
isMapLoaded = true
}
)
DisappearingScaleBar(
modifier = Modifier
.padding(top = 5.dp, start = 10.dp)
.align(Alignment.TopStart),
cameraPositionState = cameraPositionState
)
ScaleBar(
modifier = Modifier
.padding(top = 5.dp, end = 15.dp)
.align(Alignment.TopEnd),
cameraPositionState = cameraPositionState
)
if (!isMapLoaded) {
AnimatedVisibility(
modifier = Modifier
.matchParentSize(),
visible = !isMapLoaded,
enter = EnterTransition.None,
exit = fadeOut()
) {
CircularProgressIndicator(
modifier = Modifier
.background(MaterialTheme.colors.background)
.wrapContentSize()
)
}
}
}
}
}
}