Android Google Map如何检查gps位置是否在圆圈内

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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:

原文链接:https://www.f2er.com/android/312477.html

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