【发布时间】：2017-08-24 12:24:18
【问题描述】：
这不是我在 Stack Overflow 上发布的关于此问题的第一个问题。我真的需要帮助将我的地图片段缩放到当前位置。请不要以为我没有尝试任何事情。我尝试了很多。
我需要将我的地图缩放到当前位置，并且 无论我多么努力地尝试将地图缩放到另一个位置而不是我当前的位置。甚至无法想象这里发生了什么。
这是我的GoogleMapsFragment.java
public class GoogleMapsFragment extends android.support.v4.app.Fragment implements LocationListener, OnMapReadyCallback, GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {
View rootView;
private GoogleApiClient mGoogleApiClient;
private GoogleMap map;
private LatLng latlng;
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();
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();
}
}
return rootView;
}
@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;
}
}
//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 onMapReady(GoogleMap googleMap) {
map = googleMap;
// Zoom in, animating the camera.
map.animateCamera(CameraUpdateFactory.zoomTo(5), 5000, null);
map.getUiSettings().setZoomControlsEnabled(false);
map.getUiSettings().setCompassEnabled(false);
map.getUiSettings().setMyLocationButtonEnabled(true);
}
@Override
public void onConnected(Bundle bundle) {
LocationManager locationManager = (LocationManager) getActivity().getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
Location location = locationManager.getLastKnownLocation(locationManager.getBestProvider(criteria, false));
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
if (mGoogleApiClient != null) {
mGoogleApiClient.connect();
}
}
}
我认为我犯了一个小错误，它会缩放到另一个位置，甚至离我的国家都不近。
这是我缩放位置的图像。
请告诉我如何将我的地图片段缩放到当前位置。
任何形式的帮助都将不胜感激。 :)
~ 为 Gaurav 编辑 ~
在 onMapReady() 中添加了 getMyLocation()
@Override
public void onMapReady(GoogleMap googleMap) {
map = googleMap;
getMyLocation();
// Zoom in, animating the camera.
map.animateCamera(CameraUpdateFactory.zoomTo(5), 5000, null);
map.getUiSettings().setZoomControlsEnabled(false);
map.getUiSettings().setCompassEnabled(false);
map.getUiSettings().setMyLocationButtonEnabled(true);
}
~编辑完整代码~
public class GoogleMapsFragment extends android.support.v4.app.Fragment implements LocationListener, OnMapReadyCallback, GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {
View rootView;
private GoogleApiClient mGoogleApiClient;
private GoogleMap map;
private LatLng latlng;
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();
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();
}
}
return rootView;
}
@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;
}
}
//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 onMapReady(GoogleMap googleMap) {
map = googleMap;
Location myLocation = getMyLocation();
LatLng latLng = new LatLng(myLocation.getLatitude(), myLocation.getLongitude());
map.animateCamera(CameraUpdateFactory.newLatLngZoom(
latLng
, 15));
}
private LocationRequest mLocationRequest;
private static final long INTERVAL = 1000 * 1000;
private static final long FASTEST_INTERVAL = 1000 * 900;
@Override
public void onConnected(Bundle bundle) {
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(INTERVAL);
mLocationRequest.setFastestInterval(FASTEST_INTERVAL);
mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, (com.google.android.gms.location.LocationListener) this);
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
if (mGoogleApiClient != null) {
mGoogleApiClient.connect();
}
}
}
~错误日志~
06-16 11:23:28.180 6647-6647/com.myayubo E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.myayubo, PID: 6647
java.lang.NullPointerException
at com.myayubo.GoogleMapsFragment.onMapReady(GoogleMapsFragment.java:151)
at com.google.android.gms.maps.SupportMapFragment$zza$1.zza(Unknown Source)
at com.google.android.gms.maps.internal.zzl$zza.onTransact(Unknown Source)
at android.os.Binder.transact(Binder.java:361)
at com.google.android.gms.maps.internal.v$a$a.a(:com.google.android.gms.alldynamite:82)
at maps.ei.bu$6.run(Unknown Source)
at android.os.Handler.handleCallback(Handler.java:808)
at android.os.Handler.dispatchMessage(Handler.java:103)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5299)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:829)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:645)
at dalvik.system.NativeStart.main(Native Method)
【问题讨论】：
标签： android google-maps android-fragments