In android Google Map , I want to draw a path between two places.

When Iam Using Hardcoded latitude and Longitude Showing Perfectly.

Problem-1

But Latitude and Longitude Getting from other Intent Showing Blue Screen in Map

Then closing that page again opening its Showing path Between Two Points.

Problem-2

then Iam Changing the Latitude and longitude of Both Locations its Showing Previous Location Path.

Here Latitute and Longitude values Iam getting from Previous intent.

How to resolve it. I Have Added my Code

MainActivity .java

    public class MainActivity extends FragmentActivity implements OnInfoWindowClickListener{


        public double Latitude1_Current_double,Longitutde1_Current_double,Latitude1_Center_double,Longitude1_Center_double;

         private int zoomLevel = 11;

         LatLng origin1 = new LatLng(Latitude1_Current_double, Longitutde1_Current_double);
            LatLng dest1 = new LatLng(Latitude1_Service_double,Longitude1_Service_double);

            double lat1=Latitude1_Current_double;
            double lang1=Longitutde1_Current_double;
            double lat2=Latitude1_Center_double;
            double lang2=Longitude1_Center_double;


            GoogleMap map;
            ArrayList<LatLng> markerPoints;

             /*private int zoomLevel1 = 14;
             private int zoomLevel2 = 11;*/

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);

            Bundle extras = getIntent().getExtras();


            String Latitude1_Current_String=extras.getString("STRING_I_NEED_LATITUDE_Current");
            String Longitutde1_Current_String =extras.getString("STRING_I_NEED_LONGITUDE_Current");
            String Latitude1_ServiceCenter_String =extras.getString("STRING_I_NEED_LATITUDE_ServiceCenter");
            String Longitude1_ServiceCenter_String =extras.getString("STRING_I_NEED_LONGITUDE_ServiceCenter");

                Latitude1_Current_double = Double.parseDouble(Latitude1_Current_String);
                Longitutde1_Current_double = Double.parseDouble(Longitutde1_Current_String);
                Latitude1_ServiceCenter_double = Double.parseDouble(Latitude1_ServiceCenter_String);
                Longitude1_ServiceCenter_double = Double.parseDouble(Longitude1_ServiceCenter_String);


            Toast.makeText(getApplicationContext(), "Get Direction"+Latitude1_Current_double+","+Longitutde1_Current_double+
                    Latitude1_Center_double+","+Longitude1_Center_double,Toast.LENGTH_SHORT).show();



            // Initializing 
            markerPoints = new ArrayList<LatLng>();

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

            // Getting reference to Button
        //  Button btnDraw = (Button)findViewById(R.id.btn_draw);       

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

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



             map.addMarker(new MarkerOptions().position(origin1)
                     .title("User Current Location")
                     .snippet("LatLng"+"("+lat1+","+lang1+")")
                     .icon(BitmapDescriptorFactory
                        .defaultMarker(BitmapDescriptorFactory.HUE_GREEN)));

             map.addMarker(new MarkerOptions().position(dest1)
                     .title("Service Center Destination Location")
                     .snippet("LatLng"+"("+lat2+","+lang2+")")
                     .icon(BitmapDescriptorFactory
                      .defaultMarker(BitmapDescriptorFactory.HUE_RED)));


            map.moveCamera(CameraUpdateFactory.newLatLngZoom(origin1, zoomLevel));
            map.moveCamera(CameraUpdateFactory.newLatLngZoom(dest1, zoomLevel));

            markerPoints.add(origin1);
            markerPoints.add(dest1);


            // Getting URL to the Google Directions API
            String url = getDirectionsUrl(origin1, dest1);              

            DownloadTask downloadTask = new DownloadTask();

            // Start downloading json data from Google Directions API
            downloadTask.execute(url);




            // The map will be cleared on long click
            map.setOnMapLongClickListener(new OnMapLongClickListener() {

                @Override
                public void onMapLongClick(LatLng point) {
                    // Removes all the points from Google Map
                    map.clear();

                    // Removes all the points in the ArrayList
                    markerPoints.clear();

                }
            });




        }

        private String getDirectionsUrl(LatLng origin,LatLng dest){

            // Origin of route
            String str_origin = "origin="+origin.latitude+","+origin.longitude;

            // Destination of route
            String str_dest = "destination="+dest.latitude+","+dest.longitude;      

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

            // Waypoints
            String waypoints = "";

            for(int i=2;i<markerPoints.size();i++)
            {
                LatLng point  = (LatLng) markerPoints.get(i);
                if(i==2)
                waypoints = "waypoints=";
                waypoints += point.latitude + "," + point.longitude + "|";
            }


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

            // Output format
            String output = "json";

            // Building the url to the web service
            String url = "https://maps.googleapis.com/maps/api/directions/"+output+"?"+parameters;


            return url;
        }

        /** A method to download json data from url */
        private String downloadUrl(String strUrl) throws IOException{
            String data = "";
            InputStream iStream = null;
            HttpURLConnection urlConnection = null;
            try{
                    URL url = new URL(strUrl);

                    // Creating an http connection to communicate with url 
                    urlConnection = (HttpURLConnection) url.openConnection();

                    // Connecting to url 
                    urlConnection.connect();

                    // Reading data from url 
                    iStream = urlConnection.getInputStream();

                    BufferedReader br = new BufferedReader(new InputStreamReader(iStream));

                    StringBuffer sb  = new StringBuffer();

                    String line = "";
                    while( ( line = br.readLine())  != null){
                            sb.append(line);
                    }

                    data = sb.toString();

                    br.close();

            }catch(Exception e){
                    Log.d("Exception while downloading url", e.toString());
            }finally{
                    iStream.close();
                    urlConnection.disconnect();
            }
            return data;
         }



        // Fetches data from url passed
        private class DownloadTask extends AsyncTask<String, Void, String>{         

            // Downloading data in non-ui thread
            @Override
            protected String doInBackground(String... url) {

                // For storing data from web service
                String data = "";

                try{
                    // Fetching the data from web service
                    data = downloadUrl(url[0]);
                }catch(Exception e){
                    Log.d("Background Task",e.toString());
                }
                return data;        
            }

            // Executes in UI thread, after the execution of
            // doInBackground()
            @Override
            protected void onPostExecute(String result) 
            {           
                super.onPostExecute(result);            

                try
                {
                ParserTask parserTask = new ParserTask();

                // Invokes the thread for parsing the JSON data
                parserTask.execute(result);

            } 
            catch (Exception e)
            {
                e.printStackTrace();
                Log.i("Exceptoin in DownloadTask onPostExecute", "Errroor");
            }

            }       
        }

        /** A class to parse the Google Places in JSON format */
        private class ParserTask extends AsyncTask<String, Integer, List<List<HashMap<String,String>>> >{

            // Parsing the data in non-ui thread        
            @Override
            protected List<List<HashMap<String, String>>> doInBackground(String... jsonData) {

                JSONObject jObject; 
                List<List<HashMap<String, String>>> routes = null;                     

                try{
                    jObject = new JSONObject(jsonData[0]);
                    DirectionsJSONParser parser = new DirectionsJSONParser();

                    // Starts parsing data
                    routes = parser.parse(jObject);    
                }catch(Exception e){
                    e.printStackTrace();
                }
                return routes;
            }

            // Executes in UI thread, after the parsing process
            @Override
            protected void onPostExecute(List<List<HashMap<String, String>>> result)
            {

                try
                {

                ArrayList<LatLng> points = null;
                PolylineOptions lineOptions = null;

                // Traversing through all the routes
                for(int i=0;i<result.size();i++){
                    points = new ArrayList<LatLng>();
                    lineOptions = new PolylineOptions();

                    // Fetching i-th route
                    List<HashMap<String, String>> path = result.get(i);

                    // Fetching all the points in i-th route
                    for(int j=0;j<path.size();j++){
                        HashMap<String,String> point = path.get(j);                 

                        double lat = Double.parseDouble(point.get("lat"));
                        double lng = Double.parseDouble(point.get("lng"));
                        LatLng position = new LatLng(lat, lng); 

                        points.add(position);                       
                    }

                    // Adding all the points in the route to LineOptions
                    lineOptions.addAll(points);
                    lineOptions.width(5);
                    lineOptions.color(Color.BLUE);              
                }

                // Drawing polyline in the Google Map for the i-th route
                map.addPolyline(lineOptions);   

            } 
            catch (Exception e)
            {
                e.printStackTrace();
                Log.i("Exceptoin in  parsing process onPostExecute", "Errroor");
            }

            }           
        }   


        @Override
        public boolean onCreateOptionsMenu(Menu menu) {
            // Inflate the menu; this adds items to the action bar if it is present.
            getMenuInflater().inflate(R.menu.main, menu);
            return true;
        }

        @Override
        public void onInfoWindowClick(Marker marker)
        {

            Intent intent = new Intent(this, NewActivity.class);
            intent.putExtra("snippet", marker.getSnippet());
            intent.putExtra("title", marker.getTitle());
            intent.putExtra("position", marker.getPosition());
            startActivity(intent);

        }   
    }

DirectionsJSONParser.java

import com.google.android.gms.maps.model.LatLng;

public class DirectionsJSONParser {

    /** Receives a JSONObject and returns a list of lists containing latitude and longitude */
    public List<List<HashMap<String,String>>> parse(JSONObject jObject){

        List<List<HashMap<String, String>>> routes = new ArrayList<List<HashMap<String,String>>>();
        JSONArray jRoutes = null;
        JSONArray jLegs = null;
        JSONArray jSteps = null;    

        try {

            jRoutes = jObject.getJSONArray("routes");

            /** Traversing all routes */
            for(int i=0;i<jRoutes.length();i++){        
                jLegs = ( (JSONObject)jRoutes.get(i)).getJSONArray("legs");
                List path = new ArrayList<HashMap<String, String>>();

                /** Traversing all legs */
                for(int j=0;j<jLegs.length();j++){
                    jSteps = ( (JSONObject)jLegs.get(j)).getJSONArray("steps");

                    /** Traversing all steps */
                    for(int k=0;k<jSteps.length();k++){
                        String polyline = "";
                        polyline = (String)((JSONObject)((JSONObject)jSteps.get(k)).get("polyline")).get("points");
                        List<LatLng> list = decodePoly(polyline);

                        /** Traversing all points */
                        for(int l=0;l<list.size();l++){
                            HashMap<String, String> hm = new HashMap<String, String>();
                            hm.put("lat", Double.toString(((LatLng)list.get(l)).latitude) );
                            hm.put("lng", Double.toString(((LatLng)list.get(l)).longitude) );
                            path.add(hm);                       
                        }                               
                    }
                    routes.add(path);
                }
            }

        } catch (JSONException e) {         
            e.printStackTrace();
        }catch (Exception e){           
        }


        return routes;
    }   


    /**
     * Method to decode polyline points 
     * Courtesy : jeffreysambells.com/2010/05/27/decoding-polylines-from-google-maps-direction-api-with-java 
     * */
    private List<LatLng> decodePoly(String encoded) {

        List<LatLng> poly = new ArrayList<LatLng>();
        int index = 0, len = encoded.length();
        int lat = 0, lng = 0;

        while (index < len) {
            int b, shift = 0, result = 0;
            do {
                b = encoded.charAt(index++) - 63;
                result |= (b & 0x1f) << shift;
                shift += 5;
            } while (b >= 0x20);
            int dlat = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
            lat += dlat;

            shift = 0;
            result = 0;
            do {
                b = encoded.charAt(index++) - 63;
                result |= (b & 0x1f) << shift;
                shift += 5;
            } while (b >= 0x20);
            int dlng = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
            lng += dlng;

            LatLng p = new LatLng((((double) lat / 1E5)),
                    (((double) lng / 1E5)));
            poly.add(p);
        }

        return poly;
    }
}