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我想从handleNewLocation方法存储在变量中的用户位置，并计算变量x的距离。我一直在寻找全局变量，但似乎没有任何工作。需要帮助计算用户和位置之间的距离android
/*
* Define a request code to send to Google Play services
* This code is returned in Activity.onActivityResult
*/
private final static int CONNECTION_FAILURE_RESOLUTION_REQUEST = 9000;
private GoogleMap mMap; // Might be null if Google Play services APK is not available
private GoogleApiClient mGoogleApiClient;
private LocationRequest mLocationRequest;
public double currentLatitude;
public double currentLongitude;
private LatLng userLocation = new LatLng(currentLatitude,currentLongitude);
public LatLng Besabella= new LatLng(10.351763, 123.953683);
private LatLng StPeter= new LatLng(10.351910, 123.952619);
private double x = CalculationByDistance(userLocation,Besabella);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
setUpMapIfNeeded();
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
// Create a LocationRequest object
mLocationRequest = LocationRequest.create()
.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY)
.setInterval(10 * 1000) // 10 seconds, in milliseconds
.setFastestInterval(1 * 1000); // 1 second, in milliseconds
}
@Override
protected void onResume() {
super.onResume();
setUpMapIfNeeded();
mGoogleApiClient.connect();
}
@Override
protected void onPause() {
super.onPause();
if (mGoogleApiClient.isConnected()) {
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
mGoogleApiClient.disconnect();
}
}
public double CalculationByDistance(LatLng StartP, LatLng EndP) {
int Radius = 6371;// radius of earth in Kilometers
double lat1 = StartP.latitude;
double lat2 = EndP.latitude;
double lon1 = StartP.longitude;
double lon2 = EndP.longitude;
double dLat = Math.toRadians(lat2 - lat1);
double dLon = Math.toRadians(lon2 - lon1);
double a = Math.sin(dLat/2) * Math.sin(dLat/2)
+ Math.cos(Math.toRadians(lat1))
* Math.cos(Math.toRadians(lat2)) * Math.sin(dLon/2)
* Math.sin(dLon/2);
double c = 2 * Math.asin(Math.sqrt(a));
double valueResult = Radius * c;
double km = valueResult/1;
DecimalFormat newFormat = new DecimalFormat("####");
int kmInDec = Integer.valueOf(newFormat.format(km));
double meter = valueResult % 1000;
int meterInDec = Integer.valueOf(newFormat.format(meter));
Log.i("Radius Value", "" + valueResult + " KM " + kmInDec
+ " Meter " + meterInDec);
return Radius * c;
}
private void setUpMapIfNeeded() {
// Do a null check to confirm that we have not already instantiated the map.
if (mMap == null) {
// Try to obtain the map from the SupportMapFragment.
mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map))
.getMap();
// Check if we were successful in obtaining the map.
if (mMap != null) {
setUpMap();
}
}
}
private void setUpMap() {
mMap.addMarker(new MarkerOptions()
.position(new LatLng(10.351763, 123.953683))
.title("Besabella Parking Lot")
.snippet("Distance : " + x + " KM ")
.icon(BitmapDescriptorFactory.fromBitmap(resizeMapIcons("p_icon", 100, 100))));
mMap.addMarker(new MarkerOptions()
.position(new LatLng(10.351910, 123.952619))
.title("St. Peter Agrivet Pay Parking")
.icon(BitmapDescriptorFactory.fromBitmap(resizeMapIcons("p_icon",100,100))));
mMap.addMarker(new MarkerOptions()
.position(new LatLng(10.352203, 123.957021))
.title("Norbads Parking Lot")
.icon(BitmapDescriptorFactory.fromBitmap(resizeMapIcons("p_icon",100,100))));
mMap.addMarker(new MarkerOptions()
.position(new LatLng(10.329674, 123.943967))
.title("Accu-Carwash and Pay Parking")
.icon(BitmapDescriptorFactory.fromBitmap(resizeMapIcons("p_icon", 100, 100))));
mMap.addMarker(new MarkerOptions()
.position(new LatLng(10.340262, 123.941552))
.title("Entica pay parking")
.icon(BitmapDescriptorFactory.fromBitmap(resizeMapIcons("p_icon", 100, 100))));
mMap.addMarker(new MarkerOptions()
.position(new LatLng(10.345590, 123.959633))
.title("Bongo's pay parking")
.icon(BitmapDescriptorFactory.fromBitmap(resizeMapIcons("p_icon", 100, 100))));
mMap.addMarker(new MarkerOptions()
.position(new LatLng(10.341577, 123.913261))
.title("EDSHAI HOMEOWNERS")
.icon(BitmapDescriptorFactory.fromBitmap(resizeMapIcons("p_icon", 100, 100))));
}
private void handleNewLocation(Location location) {
Log.d(TAG, location.toString());
currentLatitude = location.getLatitude();
currentLongitude = location.getLongitude();
LatLng userLocation= new LatLng(currentLatitude, currentLongitude);
//mMap.addMarker(new MarkerOptions().position(new LatLng(currentLatitude, currentLongitude)).title("Current Location"));
MarkerOptions options = new MarkerOptions()
.position(userLocation)
.title("YOU ARE HERE")
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_AZURE));
mMap.addMarker(options);
// Move the camera instantly to location with a zoom of 15.
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(userLocation, 15));
// Zoom in, animating the camera.
mMap.animateCamera(CameraUpdateFactory.zoomTo(14), 2000, null);
addCircleToMap(currentLatitude, currentLongitude);
}
@Override
public void onConnected(Bundle bundle) {
Location location = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
if (location == null) {
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
}
else {
handleNewLocation(location);
}
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
/*
* Google Play services can resolve some errors it detects.
* If the error has a resolution, try sending an Intent to
* start a Google Play services activity that can resolve
* error.
*/
if (connectionResult.hasResolution()) {
try {
// Start an Activity that tries to resolve the error
connectionResult.startResolutionForResult(this, CONNECTION_FAILURE_RESOLUTION_REQUEST);
/*
* Thrown if Google Play services canceled the original
* PendingIntent
*/
} catch (IntentSender.SendIntentException e) {
// Log the error
e.printStackTrace();
}
} else {
/*
* If no resolution is available, display a dialog to the
* user with the error.
*/
Log.i(TAG, "Location services connection failed with code " + connectionResult.getErrorCode());
}
}
@Override
public void onLocationChanged(Location location) {
handleNewLocation(location);
}
public void addCircleToMap(double lat, double longi) {
// circle settings
int radiusM = 1000; // your radius in meters
double latitude2 = lat; // your center latitude
double longitude2 = longi; // your center longitude
LatLng latLng = new LatLng(latitude2,longitude2);
// draw circle
int d = 500; // diameter
Bitmap bm = Bitmap.createBitmap(d, d, Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(bm);
Paint p = new Paint();
p.setColor(getResources().getColor(R.color.wallet_holo_blue_light));
c.drawCircle(d/2, d/2, d/2, p);
// generate BitmapDescriptor from circle Bitmap
BitmapDescriptor bmD = BitmapDescriptorFactory.fromBitmap(bm);
// mapView is the GoogleMap
mMap.addGroundOverlay(new GroundOverlayOptions().
image(bmD).
position(latLng,radiusM*2,radiusM*2).
transparency(0.4f));
}
}