我正在尝试编写一个在加载应用程序时将地图缩放到当前位置的代码。
这是我用来缩放地图的代码。
//Zoom to the current location
public Location getMyLocation() {
LocationManager locationManager = (LocationManager) getActivity().getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
Location location = locationManager.getLastKnownLocation(locationManager.getBestProvider(criteria, false));
if (location != null)
{
map.animateCamera(CameraUpdateFactory.newLatLngZoom(
new LatLng(location.getLatitude(), location.getLongitude()), 13));
CameraPosition cameraPosition = new CameraPosition.Builder()
.target(new LatLng(location.getLatitude(), location.getLongitude())) // Sets the center of the map to location user
.zoom(17) // Sets the zoom
.bearing(90) // Sets the orientation of the camera to east
.tilt(40) // Sets the tilt of the camera to 30 degrees
.build(); // Creates a CameraPosition from the builder
map.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));
}
return location;
}
然后我在Fragment的
onCreateView中调用了该方法。这是代码。
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
if(!isGooglePlayServiceAvailable())
{
return null;
}
if(rootView != null)
{
ViewGroup parent = (ViewGroup)rootView.getParent();
if(parent != null)
{
parent.removeView(rootView);
}
}
else
{
rootView = inflater.inflate(R.layout.google_maps, container, false);
map = ((SupportMapFragment) getChildFragmentManager().findFragmentById(R.id.map))
.getMap();
map.addMarker(new MarkerOptions().position(new LatLng(0, 0)).title("Marker").snippet("Snippet"));
LocationManager locationManager = (LocationManager) getActivity().getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
String bestProvider = locationManager.getBestProvider(criteria, false);
if(bestProvider != null)
{
Location location = locationManager.getLastKnownLocation(bestProvider);
if(location != null)
{
onLocationChanged(location);
}
locationManager.requestLocationUpdates(bestProvider, 20000, 0, this);
}
}
return rootView;
}
但是，我的代码似乎没有执行此缩放部分。
我是Android的新手，这是我在片段中使用的第一个代码（我之所以这样说是因为这对高级人员来说可能是一个低级的问题）。那么，有人可以告诉我是否有实现片段的任何特定方法？
提前致谢。 :)
-编辑-
这是我的
GoogleMapsFragment.javapublic class GoogleMapsFragment extends android.support.v4.app.Fragment implements LocationListener {
View rootView;
static final LatLng HAMBURG = new LatLng(53.558, 9.927);
private GoogleMap map;
public GoogleMapsFragment()
{
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
if(!isGooglePlayServiceAvailable())
{
return null;
}
if(rootView != null)
{
ViewGroup parent = (ViewGroup)rootView.getParent();
if(parent != null)
{
parent.removeView(rootView);
}
}
else
{
rootView = inflater.inflate(R.layout.google_maps, container, false);
map = ((SupportMapFragment) getChildFragmentManager().findFragmentById(R.id.map))
.getMap();
map.addMarker(new MarkerOptions().position(new LatLng(0, 0)).title("Marker").snippet("Snippet"));
LocationManager locationManager = (LocationManager) getActivity().getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
String bestProvider = locationManager.getBestProvider(criteria, false);
if(bestProvider != null)
{
Location location = locationManager.getLastKnownLocation(bestProvider);
if(location != null)
{
onLocationChanged(location);
}
locationManager.requestLocationUpdates(bestProvider, 20000, 0, this);
}
}
return rootView;
}
//Zoom to the current location
public Location getMyLocation() {
LocationManager locationManager = (LocationManager) getActivity().getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
Location location = locationManager.getLastKnownLocation(locationManager.getBestProvider(criteria, false));
if (location != null)
{
map.animateCamera(CameraUpdateFactory.newLatLngZoom(
new LatLng(location.getLatitude(), location.getLongitude()), 13));
CameraPosition cameraPosition = new CameraPosition.Builder()
.target(new LatLng(location.getLatitude(), location.getLongitude())) // Sets the center of the map to location user
.zoom(17) // Sets the zoom
.bearing(90) // Sets the orientation of the camera to east
.tilt(40) // Sets the tilt of the camera to 30 degrees
.build(); // Creates a CameraPosition from the builder
map.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));
}
return location;
}
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
map.setMyLocationEnabled(true); // Identify the current location of the device
Location currentLocation = getMyLocation(); // Calling the getMyLocation method
}
@Override
public void onLocationChanged(Location location) {
double latitude = location.getLatitude();
double longitude = location.getLongitude();
LatLng latLng = new LatLng(latitude, longitude);
map.addMarker(new MarkerOptions().position(latLng));
map.moveCamera(CameraUpdateFactory.newLatLng(latLng));
map.animateCamera(CameraUpdateFactory.zoomTo(15));
}
@Override
public void onStatusChanged(String s, int i, Bundle bundle) {
}
@Override
public void onProviderEnabled(String s) {
}
@Override
public void onProviderDisabled(String s) {
}
private boolean isGooglePlayServiceAvailable()
{
int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(getActivity());
if(ConnectionResult.SUCCESS == status)
{
return true;
}
else
{
GooglePlayServicesUtil.getErrorDialog(status, getActivity(), 0).show();
return false;
}
}
}
最佳答案
1.实现接口
implements OnMapReadyCallback, GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener
2.添加
private GoogleApiClient mGoogleApiClient;
private GoogleMap mMap;
private LatLng latlng;
3.在
onCreateView方法中添加此代码SupportMapFragment mapFragment = (SupportMapFragment) getChildFragmentManager()
.findFragmentById(R.id.map);
if (mapFragment != null)
mapFragment.getMapAsync(this);
if (mGoogleApiClient == null) {
mGoogleApiClient = new GoogleApiClient.Builder(getActivity())
.addApi(LocationServices.API).addConnectionCallbacks(this)
.addOnConnectionFailedListener(this).build();
mGoogleApiClient.connect();
}
4.
OnMapReady方法 @Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
mMap.addMarker(new MarkerOptions().position(latlng).title("")
.icon(BitmapDescriptorFactory.fromResource(R.drawable.ic_launcher)));
mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
// // Zoom in, animating the camera.
mMap.animateCamera(CameraUpdateFactory.zoomTo(15), 3000, null);
mMap.getUiSettings().setZoomControlsEnabled(false);
mMap.getUiSettings().setCompassEnabled(false);
mMap.getUiSettings().setMyLocationButtonEnabled(true);
}
5.
Override方法onConnected @Override
public void onConnected(@Nullable Bundle bundle) {
if (ContextCompat.checkSelfPermission(mActivity,
android.Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED && ContextCompat.checkSelfPermission(mActivity, android.Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
Location mLastLocation = LocationServices.FusedLocationApi.getLastLocation(
mGoogleApiClient);
if (mLastLocation != null)
latlng = new LatLng(location.getLatitude(),location.getLongitude());
return;
}
//call onMapReady override method
onMapReady(mMap);
}
6。
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
if (mGoogleApiClient != null) {
mGoogleApiClient.connect();
}
}