Question

Can I increase the accuracy of my starting position？我的marker always catch near position point我的起点而不是凝视点。

以下是我的编码：

@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);

        mgr = (LocationManager) getSystemService(LOCATION_SERVICE);
        Criteria criteria = new Criteria(); // Position Supporter Standard
        bestProvider = mgr.getBestProvider(criteria, true); // Choose the Best
                                                            // Positon
        Location location = mgr.getLastKnownLocation(bestProvider);
        latitude1 = gps.getLatitude(location);
        longitude1 = gps.getLongitude(location);

        // Getting reference to SupportMapFragment of the activity_main
        SupportMapFragment fm = (SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(R.id.map);

        // Getting Map for the SupportMapFragment
        map = fm.getMap();

        // Enable MyLocation Button in the Map
        map.setMyLocationEnabled(true);

    } // OnCreate

    // start from second page
    protected void onStart() {
        super.onStart();
        loadMap();
    }

    // Marker first point
    private void loadMap() {
        // latitude1 = gps.getLatitude(location);
        // longitude1 = gps.getLongitude(location);

        LatLng position = new LatLng(latitude1, longitude1);
        Toast.makeText(getApplicationContext(),
                "LOADlat1:" + latitude1 + " / " + "LOADlog1:" + longitude1,
                Toast.LENGTH_LONG).show();

        // Instantiating MarkerOptions class
        MarkerOptions options = new MarkerOptions();

        // Setting position for the MarkerOptions
        options.position(position);

        // add marker
        map.addMarker(options);
        Log.i("Running+", "Options3: " + String.valueOf(position));
        Log.i("Running+", "Options3: " + String.valueOf(options));

        SupportMapFragment fm = (SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(R.id.map);

        map = fm.getMap();

        map.setMyLocationEnabled(true);

    }

这是我的标记功能问题？有人可以帮我解决这个问题吗？

×××我的位置绘制路径代码×××

LocationListener onLocationChange = new LocationListener(){ 
     @Override
     public void onLocationChanged(Location location) {  
         if (location != null) {
            Toast.makeText(getApplicationContext(), "Location NO EQUAL NULL AND START!", Toast.LENGTH_LONG).show();

            GPSTracker1 gps2;
            gps2 = new GPSTracker1(MainActivity2.this);

            latitude2 = gps2.getLatitude();
            longitude2 = gps2.getLongitude();                   

                str_origin = "origin="+ latitude1 +","+ longitude1;
            //Log.i("Running+", "Origin Status: " + str_origin);

            // Destination of route
            String str_dest2 = "destination="+ latitude2 +","+ longitude2;      
            //Log.i("LOCATION+", "Destination Status: " + latitude2 + ", " + longitude2);



            // Sensor enabled
            String sensor = "sensor=false";         

            // Building the parameters to the web service
            String parameters = str_origin+"&"+str_dest2+"&"+sensor;


                    // Output format
                    String output = "json";


                    // Building the url to the web service
                    String url2 = "https://maps.googleapis.com/maps/api/directions/"+output+"?"+parameters;
                    //Log.i("Running+", "Map Get Location: " + url);
                    DownloadTask downloadTask2 = new DownloadTask();

                    downloadTask2.execute(url2);                                    


                Toast.makeText(getApplicationContext(), "Location Change 123!!", Toast.LENGTH_LONG).show();
                Toast.makeText(getApplicationContext(), "lat1:" + latitude1 + " / " + "log1:" + longitude1, Toast.LENGTH_LONG).show();
                Toast.makeText(getApplicationContext(), "lat2:" + latitude2 + " / " + "log2:" + longitude2, Toast.LENGTH_LONG).show();

                // Getting reference to SupportMapFragment of the activity_main
                SupportMapFragment fm = (SupportMapFragment)getSupportFragmentManager().findFragmentById(R.id.map);

                // Getting Map for the SupportMapFragment
                map = fm.getMap();

                // Enable MyLocation Button in the Map
                map.setMyLocationEnabled(true);     

                Toast.makeText(getApplicationContext(), "Location Change Map!!", Toast.LENGTH_LONG).show();
         }


        }  



        public void onProviderDisabled(String arg0) {  

        }  
        public void onProviderEnabled(String arg0) {  

        }  
        public void onStatusChanged(String arg0, int arg1, Bundle arg2) { 

        }

    };

我可以从两个修复点画出路径，但我想做实时步行并绘制你走路的路径。 Upper是我的onlocation更改绘制路径代码，但它有一些bug。它会画出一半的路径并且不会继续绘制agian？任何人都可以帮助我或建议我更好的方法吗？

Answer 1

与“蓝点”位置完全匹配，使用

map.setOnMyLocationChangeListener(new GoogleMap.OnMyLocationChangeListener() {
    ...
});

使用LocationManager永远不会产生与OnMyLocationChangeListener相同的结果，因为它使用的是其他提供商："gps"或"network"与"fused" }。

如何提高我的起始位置的准确性？

1 个答案: