无法在 Fragment activity（抽屉菜单）中实现 Google 地图
Cannot implement Google maps in Fragment activity (Drawer Menu)
我试图让这段代码在菜单抽屉的 fragment 中工作，但似乎不可能。有人可以帮助我吗？
public class HomeFragment extends Fragment implements OnMapReadyCallback {
private HomeViewModel homeViewModel;
private GoogleMap mMap;
LocationManager locationManager;
LocationListener locationListener;
DrawerLayout drawer;
ProgressDialog dialog;
double[][] cords;
LatLonCoordinate[] arrayCords;
JSONArray arr;
ImageView recentreLoc;
ImageView getInfo;
ImageView burger;
ImageView car;
FragmentActivity fragAct;
public View onCreateView(@NonNull LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState) {
//homeViewModel =
//
// ViewModelProviders.of(this).get(HomeViewModel.class);
View root = inflater.inflate(R.layout.fragment_home, container, false);
// 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);
recentreLoc = (ImageView) findViewById(R.id.icon_me);
getInfo = (ImageView) findViewById(R.id.icon_info);
return root;
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == 1) {
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED)
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
}
}
}
public void openDrawer(View view){
drawer.openDrawer(Gravity.LEFT);
//drawer.openDrawer(1,true);
}
public void recentreLocation(View view){
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,0,0,locationListener);
//setting last known location
Location lastKnownLocation = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
//
LatLng me = new LatLng(lastKnownLocation.getLatitude(),lastKnownLocation.getLongitude());
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(me, 16f));
}
/**
* 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(final GoogleMap googleMap) {
mMap = googleMap;
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
locationListener = new LocationListener() {
@Override
public void onLocationChanged(Location location) {
//Toast.makeText(MapsActivity.this,location.toString(),Toast.LENGTH_LONG).show();
//mMap.clear();
LatLng me = new LatLng(location.getLatitude(), location.getLongitude());
mMap.addMarker(new MarkerOptions().position(me).title("Your location"));
//mMap.moveCamera(CameraUpdateFactory.newLatLng(me));
Geocoder geocoder = new Geocoder(getApplicationContext(), Locale.getDefault());
try {
//getting info about location
List<Address> listaddresses = geocoder.getFromLocation(location.getLatitude(), location.getLongitude(), 1); //1 - show the best match (result)
if (listaddresses != null && listaddresses.size() > 0) {
//Log.i("Place", listaddresses.get(0).toString());
//Deriving useful info
String a = "";
if (listaddresses.get(0).getAdminArea() != null) {
a += listaddresses.get(0).getAdminArea() + " ";
}
if (listaddresses.get(0).getLocality() != null) {
a += listaddresses.get(0).getLocality() + " ";
}
if (listaddresses.get(0).getThoroughfare() != null) {
a += listaddresses.get(0).getThoroughfare();
}
//Toast.makeText(getApplicationContext(), a, Toast.LENGTH_LONG).show();
}
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
};
if (Build.VERSION.SDK_INT < 23) {
if (checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// Activity#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 Activity#requestPermissions for more details.
return;
}
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
} else {
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 1);
} else {
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
//setting last known location
Location lastKnownLocation = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
//
mMap.clear();
if(lastKnownLocation!= null) {
LatLng me = new LatLng(lastKnownLocation.getLatitude(), lastKnownLocation.getLongitude());
//BitmapDescriptor icon = BitmapDescriptorFactory.fromResource(R.drawable.defaultphoto);
int height = 100;
int width = 100;
BitmapDrawable bitmapdraw=(BitmapDrawable)getResources().getDrawable(R.drawable.defaultphoto);
Bitmap b=bitmapdraw.getBitmap();
Bitmap smallMarker = Bitmap.createScaledBitmap(b, width, height, false);
mMap.addMarker(new MarkerOptions().position(me).icon(BitmapDescriptorFactory.fromBitmap(smallMarker)).title("Your location"));
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(me, 16f));
}
}
}
InputStream inputStream = getApplicationContext().getResources().openRawResource(R.raw.hdb_carpark_information);
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, Charset.forName("UTF-8")));
String line = "";
ArrayList<String> arrayList;
//double [] cords ;
cords = new double[2113][2];
arrayCords = new LatLonCoordinate[2113];
int i=0;
try {
//dialog.show();
//dialog = ProgressDialog.show(MapsActivity.this, "",
// "Connecting. Please wait...", true);
reader.readLine();
while ((line = reader.readLine()) != null) {
arrayList = new ArrayList<>();
//Log.i("line", line);
String[] splitted = line.split("\",\"");
Log.i("cords",splitted[2]+" "+splitted[3]);
cords[i][0] = Double.parseDouble(splitted[2]);
cords[i][1] = Double.parseDouble(splitted[3]);
SVY21Coordinate svy21Coordinate = new SVY21Coordinate(cords[i][1],cords[i][0]);
arrayCords[i] = SVY21.computeLatLon(svy21Coordinate);
mMap.addMarker(new MarkerOptions().position(new LatLng(arrayCords[i].getLatitude(),arrayCords[i].getLongitude()))
.title(splitted[1])
.snippet(splitted[4]+"\n"+splitted[5]+"\n"+splitted[6]+"\n"+splitted[7]+"\n"+splitted[8]));
i++;
}
//dialog.dismiss();
}catch (Exception e){
e.printStackTrace();
}
}
}
Screenshot of Error screen
错误：
cannot find symbol method getSupportFragmentManager()
cannot find symbol method findViewById(int)
error: cannot find symbol method findViewById(int)
error: incompatible types: HomeFragment cannot be converted to Context
error: cannot find symbol method getSystemService(String)
error: cannot find symbol method getApplicationContext()
error: cannot find symbol method checkSelfPermission(String)
error: cannot find symbol method checkSelfPermission(String)
error: incompatible types: HomeFragment cannot be converted to Context
error: incompatible types: HomeFragment cannot be converted to Activity
error: cannot find symbol method getApplicationContext()
你必须修改你的onCreateView方法
public class HomeFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.location_fragment, container, false);
mMapView = (MapView) rootView.findViewById(R.id.mapView);
mMapView.onCreate(savedInstanceState);
mMapView.onResume(); // needed to get the map to display immediately
try {
MapsInitializer.initialize(getActivity().getApplicationContext());
} catch (Exception e) {
e.printStackTrace();
}
mMapView.getMapAsync(new OnMapReadyCallback() {
@Override
public void onMapReady(GoogleMap mMap) {
googleMap = mMap;
// For showing a move to my location button
googleMap.setMyLocationEnabled(true);
// For dropping a marker at a point on the Map
LatLng sydney = new LatLng(-34, 151);
googleMap.addMarker(new MarkerOptions().position(sydney).title("Marker Title").snippet("Marker Description"));
// For zooming automatically to the location of the marker
CameraPosition cameraPosition = new CameraPosition.Builder().target(sydney).zoom(12).build();
googleMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));
}
});
return rootView;
}
@Override
public void onResume() {
super.onResume();
mMapView.onResume();
}
@Override
public void onPause() {
super.onPause();
mMapView.onPause();
}
@Override
public void onDestroy() {
super.onDestroy();
mMapView.onDestroy();
}
@Override
public void onLowMemory() {
super.onLowMemory();
mMapView.onLowMemory();
}
}
我试图让这段代码在菜单抽屉的 fragment 中工作，但似乎不可能。有人可以帮助我吗？
public class HomeFragment extends Fragment implements OnMapReadyCallback {
private HomeViewModel homeViewModel;
private GoogleMap mMap;
LocationManager locationManager;
LocationListener locationListener;
DrawerLayout drawer;
ProgressDialog dialog;
double[][] cords;
LatLonCoordinate[] arrayCords;
JSONArray arr;
ImageView recentreLoc;
ImageView getInfo;
ImageView burger;
ImageView car;
FragmentActivity fragAct;
public View onCreateView(@NonNull LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState) {
//homeViewModel =
//
// ViewModelProviders.of(this).get(HomeViewModel.class);
View root = inflater.inflate(R.layout.fragment_home, container, false);
// 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);
recentreLoc = (ImageView) findViewById(R.id.icon_me);
getInfo = (ImageView) findViewById(R.id.icon_info);
return root;
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == 1) {
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED)
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
}
}
}
public void openDrawer(View view){
drawer.openDrawer(Gravity.LEFT);
//drawer.openDrawer(1,true);
}
public void recentreLocation(View view){
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,0,0,locationListener);
//setting last known location
Location lastKnownLocation = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
//
LatLng me = new LatLng(lastKnownLocation.getLatitude(),lastKnownLocation.getLongitude());
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(me, 16f));
}
/**
* 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(final GoogleMap googleMap) {
mMap = googleMap;
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
locationListener = new LocationListener() {
@Override
public void onLocationChanged(Location location) {
//Toast.makeText(MapsActivity.this,location.toString(),Toast.LENGTH_LONG).show();
//mMap.clear();
LatLng me = new LatLng(location.getLatitude(), location.getLongitude());
mMap.addMarker(new MarkerOptions().position(me).title("Your location"));
//mMap.moveCamera(CameraUpdateFactory.newLatLng(me));
Geocoder geocoder = new Geocoder(getApplicationContext(), Locale.getDefault());
try {
//getting info about location
List<Address> listaddresses = geocoder.getFromLocation(location.getLatitude(), location.getLongitude(), 1); //1 - show the best match (result)
if (listaddresses != null && listaddresses.size() > 0) {
//Log.i("Place", listaddresses.get(0).toString());
//Deriving useful info
String a = "";
if (listaddresses.get(0).getAdminArea() != null) {
a += listaddresses.get(0).getAdminArea() + " ";
}
if (listaddresses.get(0).getLocality() != null) {
a += listaddresses.get(0).getLocality() + " ";
}
if (listaddresses.get(0).getThoroughfare() != null) {
a += listaddresses.get(0).getThoroughfare();
}
//Toast.makeText(getApplicationContext(), a, Toast.LENGTH_LONG).show();
}
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
};
if (Build.VERSION.SDK_INT < 23) {
if (checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// Activity#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 Activity#requestPermissions for more details.
return;
}
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
} else {
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 1);
} else {
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
//setting last known location
Location lastKnownLocation = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
//
mMap.clear();
if(lastKnownLocation!= null) {
LatLng me = new LatLng(lastKnownLocation.getLatitude(), lastKnownLocation.getLongitude());
//BitmapDescriptor icon = BitmapDescriptorFactory.fromResource(R.drawable.defaultphoto);
int height = 100;
int width = 100;
BitmapDrawable bitmapdraw=(BitmapDrawable)getResources().getDrawable(R.drawable.defaultphoto);
Bitmap b=bitmapdraw.getBitmap();
Bitmap smallMarker = Bitmap.createScaledBitmap(b, width, height, false);
mMap.addMarker(new MarkerOptions().position(me).icon(BitmapDescriptorFactory.fromBitmap(smallMarker)).title("Your location"));
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(me, 16f));
}
}
}
InputStream inputStream = getApplicationContext().getResources().openRawResource(R.raw.hdb_carpark_information);
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, Charset.forName("UTF-8")));
String line = "";
ArrayList<String> arrayList;
//double [] cords ;
cords = new double[2113][2];
arrayCords = new LatLonCoordinate[2113];
int i=0;
try {
//dialog.show();
//dialog = ProgressDialog.show(MapsActivity.this, "",
// "Connecting. Please wait...", true);
reader.readLine();
while ((line = reader.readLine()) != null) {
arrayList = new ArrayList<>();
//Log.i("line", line);
String[] splitted = line.split("\",\"");
Log.i("cords",splitted[2]+" "+splitted[3]);
cords[i][0] = Double.parseDouble(splitted[2]);
cords[i][1] = Double.parseDouble(splitted[3]);
SVY21Coordinate svy21Coordinate = new SVY21Coordinate(cords[i][1],cords[i][0]);
arrayCords[i] = SVY21.computeLatLon(svy21Coordinate);
mMap.addMarker(new MarkerOptions().position(new LatLng(arrayCords[i].getLatitude(),arrayCords[i].getLongitude()))
.title(splitted[1])
.snippet(splitted[4]+"\n"+splitted[5]+"\n"+splitted[6]+"\n"+splitted[7]+"\n"+splitted[8]));
i++;
}
//dialog.dismiss();
}catch (Exception e){
e.printStackTrace();
}
}
}
Screenshot of Error screen
错误：
cannot find symbol method getSupportFragmentManager()
cannot find symbol method findViewById(int)
error: cannot find symbol method findViewById(int)
error: incompatible types: HomeFragment cannot be converted to Context
error: cannot find symbol method getSystemService(String)
error: cannot find symbol method getApplicationContext()
error: cannot find symbol method checkSelfPermission(String)
error: cannot find symbol method checkSelfPermission(String)
error: incompatible types: HomeFragment cannot be converted to Context
error: incompatible types: HomeFragment cannot be converted to Activity
error: cannot find symbol method getApplicationContext()
你必须修改你的onCreateView方法
public class HomeFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.location_fragment, container, false);
mMapView = (MapView) rootView.findViewById(R.id.mapView);
mMapView.onCreate(savedInstanceState);
mMapView.onResume(); // needed to get the map to display immediately
try {
MapsInitializer.initialize(getActivity().getApplicationContext());
} catch (Exception e) {
e.printStackTrace();
}
mMapView.getMapAsync(new OnMapReadyCallback() {
@Override
public void onMapReady(GoogleMap mMap) {
googleMap = mMap;
// For showing a move to my location button
googleMap.setMyLocationEnabled(true);
// For dropping a marker at a point on the Map
LatLng sydney = new LatLng(-34, 151);
googleMap.addMarker(new MarkerOptions().position(sydney).title("Marker Title").snippet("Marker Description"));
// For zooming automatically to the location of the marker
CameraPosition cameraPosition = new CameraPosition.Builder().target(sydney).zoom(12).build();
googleMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));
}
});
return rootView;
}
@Override
public void onResume() {
super.onResume();
mMapView.onResume();
}
@Override
public void onPause() {
super.onPause();
mMapView.onPause();
}
@Override
public void onDestroy() {
super.onDestroy();
mMapView.onDestroy();
}
@Override
public void onLowMemory() {
super.onLowMemory();
mMapView.onLowMemory();
}
}