我試圖在谷歌地圖中實作一個簡單的搜索欄，將地圖的相機指向在搜索框中輸入的位置，我已經附加了代碼，但是每當我運行它時，應用程式最終都會崩潰。代碼如下。（我也是Android開發的新手，請幫幫我）。
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {
private static final int REQUEST_LOCATION_PERMISSION = 1009;
private GoogleMap mMap;
private ActivityMapsBinding binding;
private FusedLocationProviderClient mFusedLocationClient;
//These Clusters were used to manage the marker Clusters that had images on maps too
private ClusterManager mClusterManager;
//Same is the case with these clusters
private MyClusterManagerRenderer myClusterManagerRenderer;
//Instantiating the Firestore Database
FirebaseFirestore db;
// creating a variable
// for search view.
SearchView searchView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// initializing our search view.
searchView = findViewById(R.id.idSearchView);
// initializing our firebase firestore.
db = FirebaseFirestore.getInstance();
binding = ActivityMapsBinding.inflate(getLayoutInflater());
setContentView(binding.getRoot());
//Getting the device location over here
mFusedLocationClient = LocationServices.getFusedLocationProviderClient(this);
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
//***** Searching Part starts from here*********
// adding on query listener for our search view.
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String query) {
// on below line we are getting the
// location name from search view.
String location = searchView.getQuery().toString();
// below line is to create a list of address
// where we will store the list of all address.
List<Address> addressList = null;
// checking if the entered location is null or not.
if (location != null || location.equals("")) {
// on below line we are creating and initializing a geo coder.
Geocoder geocoder = new Geocoder(MapsActivity.this);
try {
// on below line we are getting location from the
// location name and adding that location to address list.
addressList = geocoder.getFromLocationName(location, 1);
} catch (IOException e) {
e.printStackTrace();
}
// on below line we are getting the location
// from our list a first position.
Address address = addressList.get(0);
// on below line we are creating a variable for our location
// where we will add our locations latitude and longitude.
LatLng latLng = new LatLng(address.getLatitude(), address.getLongitude());
// on below line we are adding marker to that position.
mMap.addMarker(new MarkerOptions().position(latLng).title(location));
// below line is to animate camera to that position.
mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(latLng, 10));
}
return false;
}
@Override
public boolean onQueryTextChange(String newText) {
return false;
}
});
// at last we calling our map fragment to update.
mapFragment.getMapAsync(this);
}
private void addMapMarkers(){
}
private void getLastKnownLocation() {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
mFusedLocationClient.getLastLocation().addOnCompleteListener(new OnCompleteListener<Location>() {
@Override
public void onComplete(@NonNull Task<Location> task) {
if(task.isSuccessful()){
Location location = task.getResult();
}
}
});
}
/**
* Manipulates the map once available.
* This callback is triggered when the map is ready to be used.
* This is where we can add markers or lines, add listeners or move the camera. In this case,
* we just add a marker near Sydney, Australia.
* If Google Play services is not installed on the device, the user will be prompted to install
* it inside the SupportMapFragment. This method will only be triggered once the user has
* installed Google Play services and returned to the app.
*/
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
// creating a variable for document reference.
DocumentReference documentReference = db.collection("MapsData").document("7QWDor9vozLaHdFYV9kh");
// calling document reference class with on snap shot listener.
documentReference.addSnapshotListener(new EventListener<DocumentSnapshot>() {
@Override
public void onEvent(@Nullable DocumentSnapshot value, @Nullable FirebaseFirestoreException error) {
if (value != null && value.exists()) {
// below line is to create a geo point and we are getting
// geo point from firebase and setting to it.
GeoPoint geoPoint = value.getGeoPoint("geoPoint");
// getting latitude and longitude from geo point
// and setting it to our location.
LatLng location = new LatLng(geoPoint.getLatitude(), geoPoint.getLongitude());
// adding marker to each location on google maps
mMap.addMarker(new MarkerOptions().position(location).title("Name"));
// below line is use to move camera.
mMap.moveCamera(CameraUpdateFactory.newLatLng(location));
} else {
Toast.makeText(MapsActivity.this, "Error found is " error, Toast.LENGTH_SHORT).show();
}
}
});
//Adding custom maps style over here
//******** THIS PART OF CODE EXCLUSIVELY DESIGNED TO FETCH THE CUSTOM MAPS.JSON TEMPLATE**********
enableMyLocation();
try {
// Customise the styling of the base map using a JSON object defined
// in a raw resource file.
boolean success = googleMap.setMapStyle(
MapStyleOptions.loadRawResourceStyle(
this, R.raw.mapstyle));
if (!success) {
Log.e("MapsActivity", "Style parsing failed.");
}
} catch (Resources. NotFoundException e) {
Log.e("MapsActivity", "Can't find style. Error: ", e);
}
//******** MAP STYLING CODE ENDS OVER HERE **********
// Add a marker in Sydney and move the camera
LatLng sydney = new LatLng(-34, 151);
LatLng islamabad = new LatLng(33.68, 73.04);
mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Islamabad"));
//moving the camera position to Islamabad.
mMap.moveCamera(CameraUpdateFactory.newLatLng(islamabad));
}
//Getting the Users current Location
private void enableMyLocation() {
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
mMap.setMyLocationEnabled(true);
} else {
ActivityCompat.requestPermissions(this, new String[]
{Manifest.permission.ACCESS_FINE_LOCATION},
REQUEST_LOCATION_PERMISSION);
}
}
@Override
public void onRequestPermissionsResult(int requestCode,
@NonNull String[] permissions,
@NonNull int[] grantResults) {
// Check if location permissions are granted and if so enable the
// location data layer.
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
switch (requestCode) {
case REQUEST_LOCATION_PERMISSION:
if (grantResults.length > 0
&& grantResults[0]
== PackageManager.PERMISSION_GRANTED) {
enableMyLocation();
break;
}
}
}
}
uj5u.com熱心網友回復：
不要實作 SearchView，而是在成績檔案中添加來自 google 的 places API，如下所示：
implementation 'com.google.android.libraries.places:places:2.3.0'
并使用 AutocompleteSupportFragment 如下：
try {
if (!Places.isInitialized()) {
Places.initialize(getActivity().getApplicationContext(), GlobalVariables.google_api_key);
}
// Initialize the AutocompleteSupportFragment.
AutocompleteSupportFragment autocompleteFragment = (AutocompleteSupportFragment) getChildFragmentManager().findFragmentById(R.id.place_autocomplete_fragment);
autocompleteFragment.getView().setBackground(ContextCompat.getDrawable(getContext(), R.drawable.bginfo_whit));
autocompleteFragment.setPlaceFields(Arrays.asList(Place.Field.ID, Place.Field.NAME, Place.Field.LAT_LNG));
autocompleteFragment.setCountry("ET");
autocompleteFragment.setMenuVisibility(false);
autocompleteFragment.setOnPlaceSelectedListener(new PlaceSelectionListener() {
@Override
public void onPlaceSelected(Place place) {
// TODO: Get info about the selected place.
LatLng newLatLng = place.getLatLng();
mMap.moveCamera(CameraUpdateFactory.newLatLng(newLatLng));
mMap.animateCamera(CameraUpdateFactory.zoomTo(17));
}
@Override
public void onError(Status status) {
// TODO: Handle the error.
//Log.i(TAG, "An error occurred: " status);
}
});
}
catch (Exception e)
{}
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