当我将位置指针拖到另一个位置时更新位置。并在标记标题上显示当前位置。当前，它显示标记标题，但显示标记放置位置。
public class MapActivity extends FragmentActivity implements OnMapReadyCallback,GoogleApiClient.ConnectionCallbacks,GoogleApiClient.OnConnectionFailedListener,
LocationListener, GoogleMap.OnMarkerClickListener, GoogleMap.OnMarkerDragListener {
public static final int MY_PERMISSIONS_REQUEST_LOCATION = 99;
TextView add;
Button button;
GoogleApiClient mGoogleApiClient;
Location mLastLocation;
Marker mCurrLocationMarker;
LocationRequest mLocationRequest;
String getbuildingname,locality,subLocality,current_state,current_country,postal_code;
double longitude,latitude;
double last_longitude,last_latitude;
private GoogleMap mMap;
String addrs;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_map);
button = findViewById(R.id.button);
add = (TextView)findViewById(R.id.current_location);
if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
checkLocationPermission();
}
SupportMapFragment mapFragment = (SupportMapFragment)
getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
add_location();
}
// Map ready method
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
mMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
mMap.getUiSettings().setZoomControlsEnabled(true);
mMap.getUiSettings().setZoomGesturesEnabled(true);
mMap.getUiSettings().setCompassEnabled(true);
//Initialize Google Play Services
if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
buildGoogleApiClient();
mMap.setMyLocationEnabled(true);
}
} else {
buildGoogleApiClient();
mMap.setMyLocationEnabled(true);
}
mMap.setOnMarkerClickListener(this);
mMap.setOnMarkerDragListener(this);
}
protected synchronized void buildGoogleApiClient() {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(MapActivity.this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
mGoogleApiClient.connect();
}
@Override
public void onConnected(Bundle bundle) {
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(1000);
mLocationRequest.setFastestInterval(1000);
mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient,
mLocationRequest, this);
}
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onLocationChanged(Location location) {
mLastLocation = location;
if (mCurrLocationMarker != null) {
mCurrLocationMarker.remove();
}
//Showing Current Location Marker on Map
LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
MarkerOptions markerOptions = new MarkerOptions();
markerOptions.position(latLng);
LocationManager locationManager = (LocationManager)
getSystemService(Context.LOCATION_SERVICE);
assert locationManager != null;
String provider = locationManager.getBestProvider(new Criteria(), true);
if (ActivityCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
return;
}
assert provider != null;
Location locations = locationManager.getLastKnownLocation(provider);
List<String> providerList = locationManager.getAllProviders();
if (null != locations && providerList.size() > 0) {
longitude = locations.getLongitude();
latitude = locations.getLatitude();
// Geo Coder access location via lat and long
Geocoder geocoder = new Geocoder(getApplicationContext(),
Locale.getDefault());
try {
List<Address> listAddresses = geocoder.getFromLocation(latitude,
longitude, 1);
if (null != listAddresses && listAddresses.size() > 0) {
getbuildingname = listAddresses.get(0).getAddressLine(0);
locality = listAddresses.get(0).getLocality();
subLocality = listAddresses.get(0).getSubLocality();
current_state = listAddresses.get(0).getAdminArea();
current_country = listAddresses.get(0).getCountryName();
postal_code = listAddresses.get(0).getPostalCode();
markerOptions.title(""+latLng+","+subLocality+"," + locality + "," +
current_state + "," + current_country + "," + postal_code);
}
} catch (IOException e) {
e.printStackTrace();
}
}
markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_CYAN));
mCurrLocationMarker = mMap.addMarker(markerOptions);
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
mMap.animateCamera(CameraUpdateFactory.zoomTo(18));
if (mGoogleApiClient != null) {
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient,
this);
}
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
}
public boolean checkLocationPermission() {
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
if (ActivityCompat.shouldShowRequestPermissionRationale(this,
Manifest.permission.ACCESS_FINE_LOCATION)) {
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
MY_PERMISSIONS_REQUEST_LOCATION);
} else {
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
MY_PERMISSIONS_REQUEST_LOCATION);
}
return false;
} else {
return true;
}
}
@Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
if (requestCode == MY_PERMISSIONS_REQUEST_LOCATION) {
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
if (mGoogleApiClient == null) {
buildGoogleApiClient();
}
mMap.setMyLocationEnabled(true);
}
} else {
Toast.makeText(this, "permission denied",
Toast.LENGTH_LONG).show();
}
return;
}
}
// Click Listener with data insertion
private void add_location(){
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String lat = String.valueOf(latitude);
String lng = String.valueOf(longitude);
addrs = "Latitude - "+lat+" , "+"Longitude - "+lng+"\nAddress - "+getbuildingname;
add.setText(addrs);
add.setTypeface(null, Typeface.BOLD);
}
});
}
// New Methods
@Override
public boolean onMarkerClick(Marker marker) {
marker.setDraggable(true);
return false;
}
@Override
public void onMarkerDragStart(Marker marker) {
}
@Override
public void onMarkerDrag(Marker marker) {
}
@Override
public void onMarkerDragEnd(Marker marker) {
last_latitude = marker.getPosition().latitude;
last_longitude = marker.getPosition().longitude;
}
我可以获取当前位置并可以拖动标记。
没有错误，但我不知道如何更新位置？
答案 0 :(得分：0)
您应该在marker.getPosition()方法中调用onMarkerDrag，以获取在拖动标记时的当前位置。 （我知道这是您要执行的操作，但是如果出错，请纠正我。）
作为参考，Google在marker drag events上的文档规定：
您可以使用 OnMarkerDragListener 侦听标记上的拖动事件。将此监听器设置为 地图，致电GoogleMap.setOnMarkerDragListener。
拖动标记时，将调用onMarkerDragStart（Marker） 原来。拖动标记时，onMarkerDrag（Marker）是 不断地打电话。在拖动结束时，onMarkerDragEnd（Marker）是 叫。您可以随时通过调用获取标记的位置 Marker.getPosition（）。
希望这对您有所帮助。