地图视图在安卓中不显示谷歌地图 mvvm 数据绑定 [已解决]

Question

我正在尝试使用带有数据绑定的mapView设置谷歌地图，并在地图上设置一些标记。当我硬编码"；latlngs"；，但是当我试图设置"；latlngs"；我从服务器上得到的，地图没有显示。显示了标记，数据和设置标记没有问题，只有地图不起作用。谷歌标志在那里，以防你怀疑我的API密钥是否有效。这是我的密码。

这是碎片

private MapView google_map;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(@NotNull LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
FragmentMapBinding binding = DataBindingUtil.inflate(inflater, R.layout.fragment_map, container, false);
MapFragmentViewModel viewModel = new ViewModelProvider(this, new MapFragmentViewModelFactory()).get(MapFragmentViewModel.class);
binding.setLifecycleOwner(this);
binding.setViewModel(viewModel);

google_map = binding.googleMap;
viewModel.getLocations();
viewModel.locationsResponse().observe(getViewLifecycleOwner(), apiResponseObject -> {
switch (apiResponseObject.status) {
case SUCCESS:
ViewUtils.hideProgressDialog();
break;
case LOADING:
ViewUtils.showProgressDialog(requireContext());
break;
case ERROR:
ViewUtils.hideProgressDialog();
ViewUtils.showToastMessage(requireContext(), apiResponseObject.error);
}
});
setTypeFace(binding.getRoot(), requireContext());
languageSetup(requireContext());
return binding.getRoot();
}
@Override
public void onResume() {
super.onResume();
google_map.onResume();
}
@Override
public void onPause() {
super.onPause();
google_map.onPause();
}
@Override
public void onDestroy() {
super.onDestroy();
google_map.onDestroy();
}
@Override
public void onLowMemory() {
super.onLowMemory();
google_map.onLowMemory();
}
@Override
public void onStop() {
super.onStop();
google_map.onStop();
}

这是我的视图型号：

private MutableLiveData<ApiResponseObject> responseLiveData = new MutableLiveData<>();
private CompositeDisposable disposables;
private ApiCallsRepository apiCallsRepository;
public MapFragmentViewModel() {
apiCallsRepository = new ApiCallsRepository();
disposables = new CompositeDisposable();
}
void getLocations() {
disposables.add(apiCallsRepository.getLocations(SharedPrefUtils.getUserId())
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.doOnSubscribe(disposable -> responseLiveData.setValue(ApiResponseObject.loading()))
.subscribe(this::setLocations, this::handleError));
}
LiveData<ApiResponseObject> locationsResponse() {
return responseLiveData;
}
public MutableLiveData<List<LatLng>> locations = new MutableLiveData<>();
@BindingAdapter("initMap")
public static void initMap(final MapView mapView, final List<LatLng> locations) {
if (mapView != null) {
mapView.onCreate(new Bundle());
mapView.getMapAsync(googleMap -> {
if (locations != null) {
for (LatLng latLng : locations)
googleMap.addMarker(new MarkerOptions().position(latLng));
}
});
}
}
public void setLocations(List<LocationsResponse> mLocationsResponses) {
List<LatLng> latLngs = new ArrayList<>();
for (LocationsResponse locationsResponse : mLocationsResponses)
latLngs.add(new LatLng(Double.parseDouble(locationsResponse.getLongitude()), 
Double.parseDouble(locationsResponse.getLatitude())));
locations.setValue(latLngs);
responseLiveData.setValue(ApiResponseObject.success(null));
}
private void handleError(Throwable throwable) {
if (throwable instanceof HttpException) {
HttpException httpException = (HttpException) throwable;
Response<?> response = httpException.response();
responseLiveData.setValue(ApiResponseObject.error(getErrorMessage(response)));
} else if (throwable instanceof IOException) {
responseLiveData.setValue(ApiResponseObject.error(UNEXPECTED_ERROR));
} else {
responseLiveData.setValue(ApiResponseObject.error(throwable.getMessage()));
}
}

xml中的映射类似于

<com.google.android.gms.maps.MapView
android:id="@+id/google_map"
android:name="com.google.android.gms.maps.MapFragment"
android:layout_width="0dp"
android:layout_height="0dp"
app:initMap="@{viewModel.locations}"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/tvTextWarning" />

和服务器响应

[{
"Latitude": "19.8164793",
"Longitude": "45.2628729",
"Elevation": "128.6999969482422",
"RecordedAt": "2020-09-30T09:32:56"},{
"Latitude": "19.8164799",
"Longitude": "45.2628755",
"Elevation": "129.60000610351562",
"RecordedAt": "2020-09-30T10:35:42"},{
"Latitude": "19.8164801",
"Longitude": "45.262874",
"Elevation": "129.60000610351562",
"RecordedAt": "2020-09-30T10:34:04"}]

我找到了解决方案

问题是"；位置"；mutableLiveData在响应调用中被再次设置，并且再次调用getMapAsync，我需要在该方法中添加mapView.onSume。

@BindingAdapter("initMap")
public static void initMap(final MapView mapView, final List<LatLng> locations) {
if (mapView != null) {
mapView.onCreate(new Bundle());
mapView.getMapAsync(googleMap -> {
if (locations != null) {
mapView.onResume();
for (LatLng latLng : locations)
googleMap.addMarker(new MarkerOptions().position(latLng));
}
});
}
}

Answer 1

您需要在Fragment中加载映射，而不是在ViewModel中。将此代码移动到片段的onViewCreated

mapView.getMapAsync(googleMap -> {
if (locations != null) {
for (LatLng latLng : locations)
googleMap.addMarker(new MarkerOptions().position(latLng));
}
});