Android Google Map如何检查gps位置是否在圆圈内

概述我正在尝试使用用户gps位置来检测用户是否位于标记的半径.我有标记的坐标,但我不知道如何计算用户是否在该区域.我试图使用以下内容,但即使当前位置在圈子内,我仍然会收到“外部”消息. public class MapaEscola extends FragmentActivity { private GoogleMap googleMap; private Serializable 我正在尝试使用用户gps位置来检测用户是否位于标记的半径.我有标记的坐标,但我不知道如何计算用户是否在该区域.我试图使用以下内容,但即使当前位置在圈子内,我仍然会收到“外部”消息.

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();    }}

解决方法 我刚刚运行更新的代码,并找出主要问题是什么.

您应该使用传入onMyLocationChange()回调的位置,以便它使用您当前的位置来判断设备是否在圆圈内：

GoogleMap.setonMyLocationchangelistener(new GoogleMap.OnMyLocationchangelistener() {                @OverrIDe                public voID onMyLocationChange(Location location) {                    float[] distance = new float[2];                    /*                    Location.distanceBetween( mMarker.getposition().latitude,distance);                            */                    Location.distanceBetween( location.getLatitude(),location.getLongitude(),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,Toast.LENGTH_LONG).show();                    }                }            });

以下是我运行的全部工作示例,它是您的原始代码的缩减版本：

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,distance);                                */                        Location.distanceBetween( location.getLatitude(),distance);                        if( distance[0] > mCircle.geTradius()  ){                            Toast.makeText(getBaseContext(),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(),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();    }}

圈内结果：

圆圈外的结果：

总结

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