如何解决MapView在Android mvvm数据绑定中不显示Google地图[已解决]
我正在尝试使用具有数据绑定功能的mapView设置google地图,并在地图上设置一些标记。当我对“ latlngs”进行硬编码时,我的地图工作正常,但是当我尝试设置从服务器获取的“ latlngs”时,地图不会显示。显示了标记,数据和设置标记没有问题,只有地图不起作用。还有Google徽标,以防您怀疑我的API密钥是否有效。这是我的代码。
这是片段
<input type="time" class="form-control" id="uhrzeit_beginn" name="uhrzeit_beginn" required>
这是我的viewModel:
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();
}
xml中的地图就像这样
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()));
}
}
和服务器响应
<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" />
我找到了解决方案
问题是在响应调用上再次设置了“位置” mutableLiveData,并且再次调用了getMapAsync,我需要在该方法内添加mapView.onResume。
[{
"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","RecordedAt": "2020-09-30T10:34:04"}]
解决方法
您需要在Fragment中而不是在ViewModel中加载地图。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));
}
});
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