Android Google Karte, wie um zu prüfen, ob die gps-Position innerhalb des Kreises

Ich lief nur den aktualisierten code und herausgefunden, was das Hauptproblem ist.

Sollten Sie mit Hilfe der Location ging in die onMyLocationChange() Rückruf, so dass Sie verwendet Ihre aktuelle Position zu sagen, wenn sich das Gerät im Kreis, oder nicht:

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();
                    }

                }
            });

Hier ist das komplette Beispiel, dass ich lief, es ist eine abgespeckte version Ihrer ursprünglichen code:

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();
    }


}

Ergebnisse Innerhalb des Kreises:

Ergebnisse von außerhalb des Kreises:

InformationsquelleAutor Daniel Nugent

Hallo ich habe mir richtig funktioniert mit diesem code

//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();
    }

}

Innerhalb des Kreises

Außerhalb des Kreises

InformationsquelleAutor matthewoak