When Getting GPS Location, load another URL..

Question

Hello :)

I have a little problem... I have made an Android application which extends the webview. The webview Html page with a map on like this: Map example, it was also here I got my inspiration. My onCreate method looks like this:

super.onCreate(savedInstanceState);

         //Removes the title bar in the application
         requestWindowFeature(Window.FEATURE_NO_TITLE);
         setContentView(R.layout.main);

         //Creation of the Webview found in the XML Layout file
         browserView = (WebView)findViewById(R.id.webkit);

         //Removes both vertical and horizontal scroll bars 
         browserView.setVerticalScrollBarEnabled(false);
         browserView.setHorizontalScrollBarEnabled(false);


         myLocationManager=(LocationManager)getSystemService(Context.LOCATION_SERVICE);
         //Enable Javascripts

         url = "http://www.my-homepage.dk/map_example.html";

         browserView.getSettings().setJavaScriptEnabled(true);


         //The website which is wrapped to the webview

         browserView.loadUrl(url);

So when My application gets a GPS location, it invokes this method:

LocationListener onLocationChange=new LocationListener() {


  public void onLocationChanged(Location location) {


 StringBuilder buf=new StringBuilder(url);

 buf.append("?");
 buf.append("lon=");
 buf.append(String.valueOf(location.getLongitude()));
 buf.append("&");
 buf.append("lat=");
 buf.append(String.valueOf(location.getLatitude()));

    browserView.loadUrl(buf.toString());

 }

So it basically just loads another URL.... But, my problem is, 1. it keeps the orignal website "map image", i imagined it would "unload" the page, and 2. When the second url is loaded, it takes quite a long time before it is finished, and when i am testing on my HTC Desire, it sometimes doesnt show the second loaded page (the map with location) before it turns the screen off and lock, or if i go out and in the application, that sometimes helps too...

Hope you can help :)

Answer 1

Here is the solution... The GPS listener apparently broadcast more than once ;) so, when the GPS finds a location it loads the url and then stops broadcasting.

So the problem before was, that it sent loads of URL's to the html page, and therefore never just loaded 1 single url. And i just simplified the onLocationChanged a bit.

   public void locationFound(){

        myLocationManager.removeUpdates(this);

    }

        @Override
        public void onLocationChanged(Location location) {

            String lon = "lon="+String.valueOf(location.getLongitude());
            String lat = "lat="+String.valueOf(location.getLatitude());


            browserView.loadUrl(url+"?"+lon+"&"+lat);
            locationFound();
        }

Here is the SourceCode for the application:

package com.webview;



import android.app.Activity;
import android.content.Context;

import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.util.Log;
import android.view.Window;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;




public class WebViewTest extends Activity implements LocationListener{

    private WebView browserView;
     private static String PROVIDER="gps";
     private LocationManager myLocationManager=null;
     private String url;
     private boolean LocFound = false;


    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);

         //Removes the title bar in the application
         requestWindowFeature(Window.FEATURE_NO_TITLE);
         setContentView(R.layout.main);

         //Creation of the Webview found in the XML Layout file
         browserView = (WebView)findViewById(R.id.webkit);

         //Removes both vertical and horizontal scroll bars 
         browserView.setVerticalScrollBarEnabled(false);
         browserView.setHorizontalScrollBarEnabled(false);


         myLocationManager=(LocationManager)getSystemService(Context.LOCATION_SERVICE);
         //Enable Javascripts

         url = "http://www.test.dk/test.html";

         browserView.getSettings().setJavaScriptEnabled(true);


         //The website which is wrapped to the webview

        browserView.loadUrl(url);


          }

    @Override
    public void onResume() {
    super.onResume();
    myLocationManager.requestLocationUpdates(PROVIDER, 0,
    0,
    this);
    }

    @Override
    public void onPause() {
    super.onPause();
    myLocationManager.removeUpdates(this);
    }

    public void locationFound(){

        myLocationManager.removeUpdates(this);

    }

        @Override
        public void onLocationChanged(Location location) {

            String lon = "lon="+String.valueOf(location.getLongitude());
            String lat = "lat="+String.valueOf(location.getLatitude());


            browserView.loadUrl(url+"?"+lon+"&"+lat);
            locationFound();
        }

        @Override
        public void onProviderDisabled(String provider) {
            // TODO Auto-generated method stub

        }

        @Override
        public void onProviderEnabled(String provider) {
            // TODO Auto-generated method stub

        }

        @Override
        public void onStatusChanged(String provider, int status, Bundle extras) {
            // TODO Auto-generated method stub

        }

    }