Android MapView从searchView加载位置

Question

当用户在searchView中单击按钮或提交搜索时，是否可以在mapView中加载标记。当用户提交数据时，我在获取要显示的标记位置时遇到问题。当用户提交信息时，它会提取纬度和经度，但不会立即更新视图模型中的位置。

public class SearchFragment extends Fragment implements OnMapReadyCallback {
private static final String TAG = "SearchFragment";
private SearchViewModel searchViewModel;
private LatLng location;
private Marker marker;
//UI
private MapView mapView;
private SearchView searchView;
private TextView cityTv, countryTv, regionTv, ispTv, timezoneTv, postalTv, countryCallingCodeTv;
private static final String MAPVIEW_BUNDLE = "MAPVIEW_BUNDLE";

public View onCreateView(@NonNull LayoutInflater inflater,
ViewGroup container, final Bundle savedInstanceState) {
Log.d(TAG, "onCreateView: ");
final View view = inflater.inflate(R.layout.fragment_search, container, false);
searchView = view.findViewById(R.id.search_searchview);
cityTv = view.findViewById(R.id.city_input_textview);
countryTv = view.findViewById(R.id.country_input_textview);
regionTv = view.findViewById(R.id.region_input_textview);
ispTv = view.findViewById(R.id.isp_input_textview);
timezoneTv = view.findViewById(R.id.timezone_input_textview);
postalTv = view.findViewById(R.id.postal_input_textview);
countryCallingCodeTv = view.findViewById(R.id.countrycallingcode_input_textview);

Bundle mapViewBundle = null;
if (savedInstanceState != null) {
mapViewBundle = savedInstanceState.getBundle(MAPVIEW_BUNDLE);
}
mapView = view.findViewById(R.id.location_mapview);
mapView.onCreate(mapViewBundle);

searchViewModel = ViewModelProviders.of(this).get(SearchViewModel.class);

searchView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(final View view) {
searchView.setIconified(false);
//returns result from search view
getSearchViewResults(view);
}
});
return view;
}
@Override
public void onSaveInstanceState(@NonNull Bundle outState) {
super.onSaveInstanceState(outState);
Bundle mapViewBundle = outState.getBundle(MAPVIEW_BUNDLE);
if (mapViewBundle == null) {
mapViewBundle = new Bundle();
outState.putBundle(MAPVIEW_BUNDLE, mapViewBundle);
}
mapView.onSaveInstanceState(mapViewBundle);
}

//retrieves the search results from searchView and passes information to searchviewmodel
public void getSearchViewResults(final View view) {
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String query) {
Log.d(TAG, "onQueryTextSubmit: ");
//TODO: add input validation to make sure addres is correct
//TODO: if incorrect display toast message saying input is invalid
searchViewModel.getIpAddress(query);
//observer to observe data change and display search results in textview
observeSearchView();
mapView.getMapAsync(SearchFragment.this);

return false;
}
@Override
public boolean onQueryTextChange(String newText) {
return false;
}
});
}

private void observeSearchView() {
searchViewModel.getIpLocation().observe(SearchFragment.this, new Observer<IPLocation>() {
@Override
public void onChanged(IPLocation ipLocation) {
cityTv.setText(ipLocation.getCity());
countryTv.setText(ipLocation.getCountry());
regionTv.setText(ipLocation.getRegion());
ispTv.setText(ipLocation.getOrg());
timezoneTv.setText(ipLocation.getTimezone());
countryCallingCodeTv.setText(ipLocation.getCountryCallingCode());
postalTv.setText(ipLocation.getPostal());
location = new LatLng(ipLocation.getLatitude(), ipLocation.getLongitude());
//  Toast.makeText(getContext(), "Lat: " + location, Toast.LENGTH_SHORT).show();

}
});
}

//displays the lat/lon of entered address
@Override
public void onMapReady(GoogleMap googleMap) {
Log.d(TAG, "onMapReady: ");

//test adds marker in sydney and moves the camera to location
if (searchViewModel.getResult()) {

try {
marker = googleMap.addMarker(new MarkerOptions().position(location).title("Location"));
marker.setPosition(location);
googleMap.moveCamera(CameraUpdateFactory.newLatLng(location));
googleMap.getMinZoomLevel();
} catch (Exception e) {
Toast.makeText(getContext(), "Exception: " + e, Toast.LENGTH_SHORT).show();
}
} else {
Toast.makeText(getContext(), "FALSE", Toast.LENGTH_SHORT).show();
}
}

@Override
public void onResume() {
Log.d(TAG, "onResume: map ");
super.onResume();
mapView.onResume();
}
@Override
public void onStart() {
Log.d(TAG, "onStart: map");
super.onStart();
mapView.onStart();
}
@Override
public void onStop() {
Log.d(TAG, "onStop: map");
super.onStop();
mapView.onStop();
}
@Override
public void onPause() {
Log.d(TAG, "onPause: map ");
super.onPause();
mapView.onPause();
}
@Override
public void onDestroy() {
Log.d(TAG, "onDestroy: map");
super.onDestroy();
mapView.onDestroy();
}


public class SearchViewModel extends ViewModel {
private static final String TAG = "SearchViewModel";
private Boolean result = false;
private String input;
private ArrayList<IPLocation> ipLocationsList;
private MutableLiveData<IPLocation> ipLocation;
private MutableLiveData<Double> latResult = new MutableLiveData<>();
private MutableLiveData<Double> lonResult = new MutableLiveData<>();

public SearchViewModel() {
Log.d(TAG, "SearchViewModel: ");
ipLocation = new MutableLiveData<>();
ipLocationsList = new ArrayList<>();

}
public void getIpAddress(String ipAdress) {
Log.d(TAG, "getInfo: Start");

Calendar calendar = Calendar.getInstance();
final Date dateNow = calendar.getTime();
final GetDataService[] getDataService = {RetrofitClientInstance.getRetrofit()
.create(GetDataService.class)};
Call<IPLocation> call = getDataService[0].getLocationByIP(ipAdress);
call.enqueue(new Callback<IPLocation>() {
@Override
public void onResponse(Call<IPLocation> call, Response<IPLocation> response) {
Log.d(TAG, "onResponse: Start");
ipLocation.setValue(new IPLocation(0, response.body().getIp(),
response.body().getCity(), response.body().getRegion(),
response.body().getRegionCode(), response.body().getCountry(), response.body().getCountryName(),
response.body().getContinentCode(), response.body().getInEu(), response.body().getPostal(),
response.body().getLatitude(), response.body().getLongitude(), response.body().getTimezone(),
response.body().getUtcOffset(), response.body().getCountryCallingCode(), response.body().getCurrency(),
response.body().getLanguages(), response.body().getAsn(), response.body().getOrg(), dateNow));

latResult.setValue(response.body().getLatitude());
lonResult.setValue(response.body().getLongitude());
setResult(true);

}
@Override
public void onFailure(Call<IPLocation> call, Throwable t) {
Log.d(TAG, "onFailure: Fail");

}
});

}

public Boolean getResult() {
return result;
}
public void setResult(Boolean result) {
this.result = result;
}
public MutableLiveData<IPLocation> getIpLocation() {
return ipLocation;
}
public MutableLiveData<Double> getLatResult() {
return latResult;
}
public void setLatResult(MutableLiveData<Double> latResult) {
this.latResult = latResult;
}
public MutableLiveData<Double> getLonResult() {
return lonResult;
}
public void setLonResult(MutableLiveData<Double> lonResult) {
this.lonResult = lonResult;
}

}

<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:id="@+id/location_title_textview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="@string/location_title"
android:textAlignment="center"
android:textSize="24sp" />
<com.google.android.gms.maps.MapView
android:id="@+id/location_mapview"
android:layout_width="match_parent"
android:layout_height="319dp" />
</LinearLayout>

Answer 1

从onMapReady(GoogleMap-GoogleMap(回调接收到对象后，全局保存您的谷歌地图对象。

在进行API调用并获取结果后，对地图执行类似操作

LatLng latlng = new LatLng(response.body().getLatitude(), response.body().getLongitude());
MarkerOptions markerOption = new MarkerOption();
markerOptions.setPosition(latlng);
markerOptions.setIcon(*PASS_YOUR_BITMAP_FOR_ICON_HERE*);
markerOptions.title("Location")
Marker marker = googleMap.addMarker(markerOption);
googleMap.moveCamera(CameraUpdateFactory.newLatLng(latlng));