如何解决Android Jetpack撰写:使用Google Map在创建地图时崩溃
我试图在google的帮助下实现google map,在此处撰写示例项目调用 Crane : https://github.com/android/compose-samples/tree/main/Crane
我采用了相同的实现方式,并使用 MapViewUtils 来实现地图的lifeCycler并防止重新编写内容,等等...我将所有android map键以及权限在清单上 但是我的代码在地图开始时崩溃:
这就是我想显示地图的地方:
@Composable
fun MapScreen(latitude: String,longitude: String) {
// The MapView lifecycle is handled by this composable. As the MapView also needs to be updated
// with input from Compose UI,those updates are encapsulated into the MapViewContainer
// composable. In this way,when an update to the MapView happens,this composable won't
// recompose and the MapView won't need to be recreated.
val mapView = rememberMapViewWithLifecycle()
MapViewContainer(mapView,latitude,longitude)
}
@Composable
private fun MapViewContainer(
map: MapView,latitude: String,longitude: String
) {
// var zoom by savedInstanceState { InitialZoom }
AndroidView({ map }) { mapView ->
// Reading zoom so that AndroidView recomposes when it changes. The getMapAsync lambda
mapView.getMapAsync {
val position = LatLng(latitude.toDouble(),longitude.toDouble())
it.addMarker(
MarkerOptions().position(position)
)
it.moveCamera(CameraUpdateFactory.newLatLng(position))
}
}
}
这在Util类中:
@Composable
fun rememberMapViewWithLifecycle(): MapView {
val context = ContextAmbient.current
val mapView = remember {
MapView(context).apply {
id = R.id.map
}
}
// Makes MapView follow the lifecycle of this composable
val lifecycleObserver = rememberMapLifecycleObserver(mapView)
val lifecycle = LifecycleOwnerAmbient.current.lifecycle
onCommit(lifecycle) {
lifecycle.addObserver(lifecycleObserver)
onDispose {
lifecycle.removeObserver(lifecycleObserver)
}
}
return mapView
}
@Composable
private fun rememberMapLifecycleObserver(mapView: MapView): LifecycleEventObserver =
remember(mapView) {
LifecycleEventObserver { _,event ->
when (event) {
Lifecycle.Event.ON_CREATE -> mapView.onCreate(Bundle()) //Crashes here
Lifecycle.Event.ON_START -> mapView.onStart()
Lifecycle.Event.ON_RESUME -> mapView.onResume()
Lifecycle.Event.ON_PAUSE -> mapView.onPause()
Lifecycle.Event.ON_STOP -> mapView.onStop()
Lifecycle.Event.ON_DESTROY -> mapView.onDestroy()
else -> throw IllegalStateException()
}
}
}
我正在崩溃:
2020-11-05 12:16:09.282 2665-3383/com.google.android.gms.persistent E/ModuleIdSetter: exception when setting module id
java.lang.IllegalStateException: Unable to get current module info in ModuleManager created with non-module Context
at com.google.android.chimera.config.ModuleManager.getCurrentModule(:com.google.android.gms@202414022@20.24.14 (040700-319035315):2)
at aewd.a(:com.google.android.gms@202414022@20.24.14 (040700-319035315):4)
at aewg.b(:com.google.android.gms@202414022@20.24.14 (040700-319035315):9)
at aeso.a(Unknown Source:0)
at rpm.a(:com.google.android.gms@202414022@20.24.14 (040700-319035315):0)
at rlv.c(:com.google.android.gms@202414022@20.24.14 (040700-319035315):1)
at rlt.b(:com.google.android.gms@202414022@20.24.14 (040700-319035315):1)
at rok.b(:com.google.android.gms@202414022@20.24.14 (040700-319035315):6)
at rok.c(:com.google.android.gms@202414022@20.24.14 (040700-319035315):6)
at rok.b(:com.google.android.gms@202414022@20.24.14 (040700-319035315):10)
at rok.a(:com.google.android.gms@202414022@20.24.14 (040700-319035315):17)
at rok.g(:com.google.android.gms@202414022@20.24.14 (040700-319035315):3)
at sdr.a(:com.google.android.gms@202414022@20.24.14 (040700-319035315):2)
at scr.a(:com.google.android.gms@202414022@20.24.14 (040700-319035315):10)
at sci.a(:com.google.android.gms@202414022@20.24.14 (040700-319035315):0)
at scl.handleMessage(:com.google.android.gms@202414022@20.24.14 (040700-319035315):28)
at android.os.Handler.dispatchMessage(Handler.java:107)
at aekz.a(:com.google.android.gms@202414022@20.24.14 (040700-319035315):2)
at aekz.dispatchMessage(:com.google.android.gms@202414022@20.24.14 (040700-319035315):14)
at android.os.Looper.loop(Looper.java:214)
at android.os.HandlerThread.run(HandlerThread.java:67)
解决方法
在显示地图之前,您需要征得访问用户位置的许可,并确保拥有 。您可以使用带有 $dt = Carbon::createFromTimestamp(20200611151423)->toDateTimeString();
Carbon::createFromFormat('Y-d-m H:i:s',$dt,'Europe/Amsterdam');
和echo Carbon::createFromTimestamp('20200611151423','Europe/Amsterdam')->format('Y-m-d\TH:i:s.uP');
的变量,该变量会在授予权限后进行更新,这是示例的一部分:
LiveData
ViewModel
您可以在此处获取有关请求权限的更多信息:https://developer.android.com/training/permissions/requesting
,去掉返回类型从“ fun rememberMapViewWithLifecycle(): MapView ”到“ fun rememberMapViewWithLifecycle() ”
很明显,您的可组合函数返回的是 MapView,而它不应该返回类型以被视为可组合函数。 我引用自“ https://developer.android.com/jetpack/compose/mental-model"
""" 该函数不返回任何内容。生成 UI 的组合函数不需要返回任何内容,因为它们描述了所需的屏幕状态,而不是构建 UI 小部件。
"""
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