Android Google Map gps konumunun çemberin içinde olup olmadığını nasıl kontrol edelim

Question

Kullanıcıların gps konumlarını kullanarak bir kullanıcının bir İşaretçinin yarıçapında olup olmadığını tespit etmeye çalışıyorum. İşaretçinin koordinatlarını aldım, ancak kullanıcının alanda olup olmadığını nasıl hesaplayacağımı bilmiyorum. Aşağıdakileri kullanmayı denedim, ancak geçerli konum çemberin içinde olduğunda bile "dış" mesajı almaya devam ediyorum.

public class MapaEscola extends FragmentActivity { 

    private GoogleMap googleMap; 
    private Serializable escolas; 
    private ProgressDialog dialog; 
    private Circle mCircle; 
    private Marker mMarker; 



    @TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH) 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

     getActionBar().setDisplayHomeAsUpEnabled(true); 
     getActionBar().setHomeButtonEnabled(true); 

     setContentView(R.layout.maps); 

     // Loading map 
     initilizeMap(); 

     // Changing map type 
     googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL); 

     // Showing/hiding your current location 
     googleMap.setMyLocationEnabled(true); 

     // Enable/Disable zooming controls 
     googleMap.getUiSettings().setZoomControlsEnabled(true); 

     // Enable/Disable my location button 
     googleMap.getUiSettings().setMyLocationButtonEnabled(true); 

     // Enable/Disable Compass icon 
     googleMap.getUiSettings().setCompassEnabled(true); 

     // Enable/Disable Rotate gesture 
     googleMap.getUiSettings().setRotateGesturesEnabled(true); 

     // Enable/Disable zooming functionality 
     googleMap.getUiSettings().setZoomGesturesEnabled(true); 

     Bundle extra = getIntent().getBundleExtra("extra"); 
     ArrayList<Escolas> objects = (ArrayList<Escolas>) extra.getSerializable("array"); 


     try { 

      for(int i = 0; i < objects.size(); i ++) { 
       System.out.println(" escolas " + objects.get(i).getLatitude() + " " + objects.get(i).getLongitude()); 

       float latitude = objects.get(i).getLatitude(); 
       float longitude = objects.get(i).getLongitude(); 

       googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(-23.316281, -51.155528), 15)); 

       MarkerOptions options = new MarkerOptions(); 

       // Setting the position of the marker 

       options.position(new LatLng(latitude, longitude)); 

       googleMap = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap(); 

       LatLng latLng = new LatLng(latitude, longitude); 
       drawMarkerWithCircle(latLng); 


       googleMap.setOnMyLocationChangeListener(new GoogleMap.OnMyLocationChangeListener() { 
        @Override 
        public void onMyLocationChange(Location location) { 
         float[] distance = new float[2]; 

         Location.distanceBetween(mMarker.getPosition().latitude, mMarker.getPosition().longitude, 
           mCircle.getCenter().latitude, mCircle.getCenter().longitude, distance); 

         if(distance[0] > (mCircle.getRadius()/2) ){ 
          Toast.makeText(getBaseContext(), "Outside", Toast.LENGTH_LONG).show(); 
         } else { 
          Toast.makeText(getBaseContext(), "Inside", Toast.LENGTH_LONG).show(); 
         } 

        } 
       }); 




      } 



     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
    } 


    private void drawMarkerWithCircle(LatLng position){ 
     double radiusInMeters = 500.0; 
     int strokeColor = 0xffff0000; //red outline 
     int shadeColor = 0x44ff0000; //opaque red fill 

     CircleOptions circleOptions = new CircleOptions().center(position).radius(radiusInMeters).fillColor(shadeColor).strokeColor(strokeColor).strokeWidth(8); 
     mCircle = googleMap.addCircle(circleOptions); 

     MarkerOptions markerOptions = new MarkerOptions().position(position); 
     mMarker = googleMap.addMarker(markerOptions); 
    } 



    private void initilizeMap() { 

     if (googleMap == null) { 
      googleMap = ((MapFragment) getFragmentManager().findFragmentById(
        R.id.map)).getMap(); 

      // check if map is created successfully or not 
      if (googleMap == null) { 
       Toast.makeText(getApplicationContext(), 
         "Não foi possível carregar o mapa", Toast.LENGTH_SHORT) 
         .show(); 
      } 
     } 
    } 

    @TargetApi(Build.VERSION_CODES.HONEYCOMB) 
    @Override 
    public void onBackPressed() { 

     super.onBackPressed(); 
     finish(); 

    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // TODO Auto-generated method stub 
     MenuInflater inflater = getMenuInflater(); 
     inflater.inflate(R.menu.menu_main, menu); 

     return super.onCreateOptionsMenu(menu); 
    } 

    @TargetApi(Build.VERSION_CODES.HONEYCOMB) 
    public boolean onOptionsItemSelected(MenuItem item) { 


     switch (item.getItemId()) { 

      case android.R.id.home: 
       super.onBackPressed(); 
       finish(); 

       return true; 


     } 

     return true; 

    } 

    @Override 
    protected void onResume() { 
     super.onResume(); 
     initilizeMap(); 
    } 


} 

Answer 1

Güncelleştirilmiş kodu çalıştırdım ve ana sorunun ne olduğunu anladım.

Cihaz çemberin ya da değil içindeyse o anki konumunuzu kullanır, böylece söylemek gerekirse onMyLocationChange() callback'inde geçti Location kullanarak edilmelidir: Burada

googleMap.setOnMyLocationChangeListener(new GoogleMap.OnMyLocationChangeListener() { 
       @Override 
       public void onMyLocationChange(Location location) { 
        float[] distance = new float[2]; 

        /* 
        Location.distanceBetween(mMarker.getPosition().latitude, mMarker.getPosition().longitude, 
          mCircle.getCenter().latitude, mCircle.getCenter().longitude, distance); 
          */ 

        Location.distanceBetween(location.getLatitude(), location.getLongitude(), 
          mCircle.getCenter().latitude, mCircle.getCenter().longitude, distance); 

        if(distance[0] > mCircle.getRadius()){ 
         Toast.makeText(getBaseContext(), "Outside, distance from center: " + distance[0] + " radius: " + mCircle.getRadius(), Toast.LENGTH_LONG).show(); 
        } else { 
         Toast.makeText(getBaseContext(), "Inside, distance from center: " + distance[0] + " radius: " + mCircle.getRadius() , Toast.LENGTH_LONG).show(); 
        } 

       } 
      }); 

tam çalışma örnek olduğunu ben Inside

public class MainActivity extends ActionBarActivity { 

    private GoogleMap googleMap; 
    private Serializable escolas; 
    private ProgressDialog dialog; 
    private Circle mCircle; 
    private Marker mMarker; 



    @TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH) 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

     getSupportActionBar().setDisplayHomeAsUpEnabled(true); 
     getSupportActionBar().setHomeButtonEnabled(true); 

     setContentView(R.layout.activity_main); 

     // Loading map 
     initilizeMap(); 

     // Changing map type 
     googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL); 

     // Showing/hiding your current location 
     googleMap.setMyLocationEnabled(true); 

     // Enable/Disable zooming controls 
     googleMap.getUiSettings().setZoomControlsEnabled(true); 

     // Enable/Disable my location button 
     googleMap.getUiSettings().setMyLocationButtonEnabled(true); 

     // Enable/Disable Compass icon 
     googleMap.getUiSettings().setCompassEnabled(true); 

     // Enable/Disable Rotate gesture 
     googleMap.getUiSettings().setRotateGesturesEnabled(true); 

     // Enable/Disable zooming functionality 
     googleMap.getUiSettings().setZoomGesturesEnabled(true); 

     // Bundle extra = getIntent().getBundleExtra("extra"); 
     //ArrayList<Escolas> objects = (ArrayList<Escolas>) extra.getSerializable("array"); 


     try { 
       //test outside 
       double mLatitude = 37.77657; 
       double mLongitude = -122.417506; 


       //test inside 
       //double mLatitude = 37.7795516; 
       //double mLongitude = -122.39292; 


       googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(mLatitude, mLongitude), 15)); 

       MarkerOptions options = new MarkerOptions(); 

       // Setting the position of the marker 

       options.position(new LatLng(mLatitude, mLongitude)); 

       //googleMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap(); 

       LatLng latLng = new LatLng(mLatitude, mLongitude); 
       drawMarkerWithCircle(latLng); 


       googleMap.setOnMyLocationChangeListener(new GoogleMap.OnMyLocationChangeListener() { 
        @Override 
        public void onMyLocationChange(Location location) { 
         float[] distance = new float[2]; 

         /* 
         Location.distanceBetween(mMarker.getPosition().latitude, mMarker.getPosition().longitude, 
           mCircle.getCenter().latitude, mCircle.getCenter().longitude, distance); 
           */ 

         Location.distanceBetween(location.getLatitude(), location.getLongitude(), 
           mCircle.getCenter().latitude, mCircle.getCenter().longitude, distance); 

         if(distance[0] > mCircle.getRadius() ){ 
          Toast.makeText(getBaseContext(), "Outside, distance from center: " + distance[0] + " radius: " + mCircle.getRadius(), Toast.LENGTH_LONG).show(); 
         } else { 
          Toast.makeText(getBaseContext(), "Inside, distance from center: " + distance[0] + " radius: " + mCircle.getRadius() , Toast.LENGTH_LONG).show(); 
         } 

        } 
       }); 




     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
    } 


    private void drawMarkerWithCircle(LatLng position){ 
     double radiusInMeters = 500.0; 
     int strokeColor = 0xffff0000; //red outline 
     int shadeColor = 0x44ff0000; //opaque red fill 

     CircleOptions circleOptions = new CircleOptions().center(position).radius(radiusInMeters).fillColor(shadeColor).strokeColor(strokeColor).strokeWidth(8); 
     mCircle = googleMap.addCircle(circleOptions); 

     MarkerOptions markerOptions = new MarkerOptions().position(position); 
     mMarker = googleMap.addMarker(markerOptions); 
    } 



    private void initilizeMap() { 

     if (googleMap == null) { 
      googleMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(
        R.id.map)).getMap(); 

      // check if map is created successfully or not 
      if (googleMap == null) { 
       Toast.makeText(getApplicationContext(), 
         "Não foi possível carregar o mapa", Toast.LENGTH_SHORT) 
         .show(); 
      } 
     } 
    } 

    @TargetApi(Build.VERSION_CODES.HONEYCOMB) 
    @Override 
    public void onBackPressed() { 

     super.onBackPressed(); 
     finish(); 

    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // TODO Auto-generated method stub 
     MenuInflater inflater = getMenuInflater(); 
     inflater.inflate(R.menu.menu_main, menu); 

     return super.onCreateOptionsMenu(menu); 
    } 

    @TargetApi(Build.VERSION_CODES.HONEYCOMB) 
    public boolean onOptionsItemSelected(MenuItem item) { 


     switch (item.getItemId()) { 

      case android.R.id.home: 
       super.onBackPressed(); 
       finish(); 

       return true; 


     } 

     return true; 

    } 

    @Override 
    protected void onResume() { 
     super.onResume(); 
     initilizeMap(); 
    } 


} 

Sonuçları daire:

ran, başlangıçtaki kod kırpılmış versiyonu çemberin dışında bir

Sonuçlar:

Answer 2

@Daniel Nugent: "/2" yanlış böylece imho getRadius() yarıçapı ve çapı dönecektir

@WARpoluido: Konum değiştiğinde mMarker değişkeninin güncellendiğini göremiyorum. Neden onMyLocationChange()'a verilen değeri kullanmıyorsunuz?

Location.distanceBetween(mCircle.getCenter().latitude, mCircle.getCenter().longitude, location.getLatitude(), location.getLongitude(), distance); 
if(distance[0] > mCircle.getRadius()){ 
... 

Answer 3

Merhaba ben mayın setOnMyLocationChangeListener çünkü artık bu kodu

//Getting current location 
private void getCurrentLocation() { 
    mMap.clear(); 
    //Creating a location object 
    Location location = LocationServices.FusedLocationApi.getLastLocation(googleApiClient); 
    if (location != null) { 
     //Getting longitude and latitude 
     longitude = location.getLongitude(); 
     latitude = location.getLatitude(); 
     //moving the map to location 
     moveMap(); 
    } 

    Circle circle = mMap.addCircle(new CircleOptions() 
        .center(new LatLng(54.773097, -6.557841)) 
        .radius(55) 
        .strokeColor(Color.RED) 
    ); 



    pLong = location.getLongitude(); 
    pLat = location.getLatitude(); 

    float[] distance = new float[2]; 


    Location.distanceBetween(pLat, pLong, 
      circle.getCenter().latitude, circle.getCenter().longitude, distance); 

    if(distance[0] > circle.getRadius() ){ 
     Toast.makeText(getBaseContext(), "You are not in a bunker", Toast.LENGTH_LONG).show(); 
    } else { 
     Toast.makeText(getBaseContext(), "You are inside a bunker", Toast.LENGTH_LONG).show(); 
    } 

} 

Inside the circle

Outside the circle

Answer 4

Daniel Nugent kabul çözümü o kadar iyi değil ile düzgün çalışan var reddedildi şimdi. İşte

fragmanında bunu nasıl geçerli yoludur - değişikliğini getActivity() this ile Aktivitesi:

private boolean mLocationPermissionGranted; 

// The geographical location where the device is currently located. That is, the last-known 
// location retrieved by the Fused Location Provider. 
private Location mLastKnownLocation; 
private long UPDATE_INTERVAL = 10 * 1000; /* 10 secs */ 
private long FASTEST_INTERVAL = 2000; /* 2 sec */ 
private FusedLocationProviderClient mFusedLocationProviderClient; 

private void addLocationChangeListener(){ 
     // Construct a FusedLocationProviderClient. 
     mFusedLocationProviderClient = LocationServices.getFusedLocationProviderClient(getActivity()); 

     // Create the location request to start receiving updates 
     LocationRequest mLocationRequest = new LocationRequest(); 
     mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY); 
     mLocationRequest.setInterval(UPDATE_INTERVAL); 
     mLocationRequest.setFastestInterval(FASTEST_INTERVAL); 
     //mLocationRequest.setMaxWaitTime(0); 
     //mLocationRequest.setSmallestDisplacement(0); 

     // Create LocationSettingsRequest object using location request 
     LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder(); 
     builder.addLocationRequest(mLocationRequest); 
     LocationSettingsRequest locationSettingsRequest = builder.build(); 

     // Check whether location settings are satisfied 
     // https://developers.google.com/android/reference/com/google/android/gms/location/SettingsClient 
     SettingsClient settingsClient = LocationServices.getSettingsClient(getActivity()); 
     settingsClient.checkLocationSettings(locationSettingsRequest); 


     // new Google API SDK v11 uses getFusedLocationProviderClient(this) 
     if (mLocationPermissionGranted) { 
      mFusedLocationProviderClient.requestLocationUpdates(mLocationRequest, 
        new LocationCallback() { 
         @Override 
         public void onLocationResult(LocationResult locationResult) { 
          // do work here 
          Location location = locationResult.getLastLocation(); 
         } 
        }, 
        Looper.myLooper()); 
     } else { 
      getLocationPermission(); 
     } 
    }