Couldn't achieve Reverse Geocoding

Question

I am working on GPS system for android. I am able to find the latitude and longitude of my current position, but when I try to convert my latitude and longitude into Physical address my code doesn't work. I have tried several possibilities. I have posted my code here.

Any help is much appreciated. Thanks.

try {

        List<Address> addresses = gc.getFromLocation(latitude, longitude, 1);
        System.out.println(""+latitude);
        StringBuilder sb = new StringBuilder();
        if (addresses.size() > 0) {

        Address address = addresses.get(0);
        for (int i = 0; i < address.getMaxAddressLineIndex(); i++)
        sb.append(address.getAddressLine(i)).append("\n");
        sb.append(address.getLocality()).append("\n");
        sb.append(address.getPostalCode()).append("\n");
        sb.append(address.getCountryName());
        }
        addressString = sb.toString();
        } catch (IOException e) {}
        } else {
        latLongString = "No location found";
        }
        myLocationText.setText("Your Current Position is:\n" +
        latLongString + "\n" + addressString);
        }

My problem is, I couldn't get any value in the List<Address> addresses = gc.getFromLocation(latitude, longitude, 1);. It returns a empty list only. Could anyone tell me what the problem is and how to sort it out...

Sure that your latitude/longitude are correct values? What happens if you give hardcoded values where you are sure that there is a corresponding address? — Vincent Mimoun-Prat, Apr 19 '11 at 13:42
@MarvinLabs I tried hardcoded values too.. But still the list is empty. — Andro Selva, Apr 19 '11 at 14:00
You may already know this, but have you added the INTERNET permissions in the manifest file. — chaitanya, Apr 19 '11 at 14:39
More info and bugs there: http://stackoverflow.com/questions/5205650/geocoder-getfromlocation-throws-ioexception-on-android-emulator/5206936#5206936 — Vincent Mimoun-Prat, Apr 19 '11 at 15:19

score 0 · Answer 1 · answered Apr 19 '11 at 15:00

If the GeoCoder returns an empty list, you need to check if you have a proper GeoCoder implementation available on the device (emulator or real phone).

This can be done using the isPresent() method on the Geocoder object.

http://developer.android.com/reference/android/location/Geocoder.html

Also, when running on an emulator, make sure your AVD image is setup with the Google APIs.

score 0 · Accepted Answer · edited Jun 10 '11 at 09:50

0

Geocoder gc = new Geocoder(ctx, Locale.getDefault());
List<Address> addresses;
addresses = gc.getFromLocation(lat, lng, 1);        
StringBuilder sb = new StringBuilder();
if (addresses.size() > 0) 
{
    Address address = addresses.get(0);
    for (int i = 0; i < address.getMaxAddressLineIndex(); i++)
         sb.append(address.getAddressLine(i)).append(",");
}

This would get a location. But sometimes an exception comes as "Unable to parse the response from server". You need to handle the exception.Also check for the INTERNET permission in the manifest.

edited Jun 10 '11 at 09:50

Andro Selva

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answered Apr 20 '11 at 09:10

Vansi

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6

Hi there.. I have tried this already. I was actually asking for a different approach if exists. – Andro Selva Apr 26 '11 at 09:58
then u can probably call a google webservice and handle the result – Vansi Apr 26 '11 at 11:28
webservice like this.... http://maps.google.com/maps/geo?q=lattitude,longitude&output=csv&sensor=false – Vansi Apr 26 '11 at 11:29
Then handle the result. String url = "http://maps.google.com/maps/geo?q="+lattitude+","+longitude+"&output=csv&sensor=false"; Uri.parse(url); HttpClient mClient= new DefaultHttpClient(); try { HttpResponse res = mClient.execute(get); String msg = EntityUtils.toString(res.getEntity()); String[] addressInfo = msg.split(","); msg =""; for (int i = 2; i < addressInfo.length; i++) { msg = msg+addressInfo[i]; } msg = "Location: " + msg ; The string msg here will contain the address. – Vansi Apr 26 '11 at 11:33
Great idea.. Thanks there.. I will try to use it and will let know how it works. – Andro Selva Apr 27 '11 at 04:34

Couldn't achieve Reverse Geocoding

2 Answers2