Android 谷歌地图在移动时绘制路径

Question

您好，我正在使用带有LocationListener 的谷歌地图。我可以使用 Fused API

在点之间绘制路径

    protected void createLocationRequest() {
        mLocationRequest = new LocationRequest();
        mLocationRequest.setInterval(1000 * 60 * 1);
        mLocationRequest.setFastestInterval(1000 * 60 * 1);
                                            }
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);

我在这里画了路径：

    public void onLocationChanged(Location location) {
        LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());

                MarkerOptions markerOptions = new MarkerOptions();
                markerOptions.position(latLng);
                routePoints.add(latLng);
                Polyline route = mGoogleMap.addPolyline(new PolylineOptions()
                        .width(5)
                        .color(Color.BLUE)
                        .geodesic(false)
                        .zIndex(3));
                route.setPoints(routePoints);

                                            }

关键是，无论LocationRequest的间隔时间如何，我都需要在用户移动时绘制实时路径，并在用户停止时停止。

Answer 1

试试这个方法，这样您就可以根据需要决定和更改值。调用这个方法需要多少时间间隔和多少最小距离。也可以在没有互联网的情况下使用。

    private LocationManager locationManager;
    private android.location.LocationListener myLocationListener;

    public void checkLocation() {

        String serviceString = Context.LOCATION_SERVICE;
        locationManager = (LocationManager) getSystemService(serviceString);


        if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            return;
        }


        myLocationListener = new android.location.LocationListener() {
            public void onLocationChanged(Location locationListener) {

                if (isGPSEnabled(YourActivityName.this)) {
                    if (locationListener != null) {
                        if (ActivityCompat.checkSelfPermission(YourActivityName.this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(YourActivityName.this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                            return;
                        }

                        if (locationManager != null) {
                            location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
                            if (location != null) {
                                latitude = location.getLatitude();
                                longitude = location.getLongitude();
                            }
                        }
                    }
                } else if (isInternetConnected(YourActivityName.this)) {
                    if (locationManager != null) {
                        location = locationManager
                                .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                        if (location != null) {
                            latitude = location.getLatitude();
                            longitude = location.getLongitude();
                        }
                    }
                }



            }

            public void onProviderDisabled(String provider) {

            }

            public void onProviderEnabled(String provider) {

            }

            public void onStatusChanged(String provider, int status, Bundle extras) {

            }
        }; 

locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 1, myLocationListener);  //  here the min time interval and min distance 
}

isInternetConnected 方法

public static boolean isInternetConnected(Context ctx) {
        ConnectivityManager connectivityMgr = (ConnectivityManager) ctx
                .getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo wifi = connectivityMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
        NetworkInfo mobile = connectivityMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
        // Check if wifi or mobile network is available or not. If any of them is
        // available or connected then it will return true, otherwise false;
        if (wifi != null) {
            if (wifi.isConnected()) {
                return true;
            }
        }
        if (mobile != null) {
            if (mobile.isConnected()) {
                return true;
            }
        }
        return false;
    }

isGpsEnabled 方法

  public boolean isGPSEnabled(Context mContext) {
        LocationManager locationManager = (LocationManager) mContext.getSystemService(Context.LOCATION_SERVICE);
        return locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
    }

逻辑：通过保留变量检查lastlocation 是否为currantLocation，如果是，则表示如果没有绘制路径，则不会移动

Answer 2

在你的课堂上定义这个 google api 方法：

private GoogleMap.OnMyLocationChangeListener myLocationChangeListener = new GoogleMap.OnMyLocationChangeListener() {
    @Override
    public void onMyLocationChange(Location location) {
     // make your code to draw path , and refresh the map to not hve a ot of path .

     }

更多详情请看here