Get ISO country code for the given latitude longitude using GeoNames Web Service using HttpURLConnection

The GeoNames geographical database covers all countries and contains over eight million placenames that are available for download free of charge. We can get the iso country code for any given latitude/longitude, using GeoNames webservices; api.geonames.org/countryCode?

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CountryCode / reverse geocoding

The iso country code of any given point.
Webservice Type : REST 
Url : api.geonames.org/countryCode?
Parameters : lat,lng, type, lang, radius (buffer in km for closest country in coastal areas, a positive buffer expands the positiv area whereas a negative buffer reduces it);
Result : returns the iso country code for the given latitude/longitude
With the parameter type=xml this service returns an xml document with iso country code and country name. The optional parameter lang can be used to specify the language the country name should be in. JSON output is produced with type=JSON
Example http://api.geonames.org/countryCode?lat=47.03&lng=10.2&username=demo 

Important:

• Do not use the demo account for your app or your tests. It is only meant for the sample links on the documentation pages. Create your own account instead.
• The parameter username needs to be passed with each request. The username for your application can be registered here. You will then receive an email with a confirmation link and after you have confirmed the email you can enable your account for the webservice on your account page
• Dont forget to url encode string parameters containing special characters or spaces. (Faq entry on url encoding)
• ...

read details: http://www.geonames.org/export/web-services.html

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Its a example to get the ISO country code of user entered latitude/longitude.


MainActivity.java

package com.blogspot.android_er.androidgeonames;

import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class MainActivity extends AppCompatActivity {

 EditText latText;
 EditText lonText;
 Button btnFind;
 TextView textResult;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 latText = (EditText)findViewById(R.id.latText);
 lonText = (EditText)findViewById(R.id.lonText);
 btnFind = (Button)findViewById(R.id.find);
 textResult = (TextView)findViewById(R.id.result);

 btnFind.setOnClickListener(new View.OnClickListener(){
 @Override
 public void onClick(View v) {
 String strLat = latText.getText().toString();
 String strLon = lonText.getText().toString();

 new GeoNamesTask(textResult).execute(strLat, strLon);
 }
 });
 }

 private class GeoNamesTask extends AsyncTask<String, Void, String> {
 TextView tResult;

 public GeoNamesTask(TextView vResult){
 tResult = vResult;
 tResult.setText("");
 }

 @Override
 protected String doInBackground(String... params) {

 /*
 Do not use the demo account for your app or your tests.
 It is only meant for the sample links on the documentation pages.
 Create your own account instead.
 */
 String queryString =
 "http://api.geonames.org/countryCode?lat=" + params[0]
 + "&lng=" + params[1] + "&username=demo";

 String s = "";
 try {
 s = sendQuery(queryString);
 } catch (IOException e) {
 e.printStackTrace();
 s = e.getMessage();
 }
 return s;
 }

 @Override
 protected void onPostExecute(String s) {
 tResult.setText(s);
 }


 private String sendQuery(String query) throws IOException {
 String result = "";

 URL searchURL = new URL(query);

 HttpURLConnection httpURLConnection = (HttpURLConnection)searchURL.openConnection();
 if(httpURLConnection.getResponseCode() == HttpURLConnection.HTTP_OK){
 InputStreamReader inputStreamReader = new InputStreamReader(httpURLConnection.getInputStream());
 BufferedReader bufferedReader = new BufferedReader(
 inputStreamReader,
 8192);

 String line = null;
 while((line = bufferedReader.readLine()) != null){
 result += line;
 }

 bufferedReader.close();
 }

 return result;
 }
 }
}

layout/activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
 
 
 android_layout_width="match_parent"
 android_layout_height="match_parent"
 android_padding="16dp"
 android_orientation="vertical"
 tools_context=".MainActivity">

 <TextView
 android_layout_width="wrap_content"
 android_layout_height="wrap_content"
 android_layout_gravity="center_horizontal"
 android_autoLink="web"
 android_text="http://android-er.blogspot.com/"
 android_textStyle="bold" />

 <EditText
 android_id="@+id/latText"
 android_layout_width="match_parent"
 android_layout_height="wrap_content"
 android_inputType="numberSigned|numberDecimal"
 android_hint="Latitude"
 android_text="47.03"/>

 <EditText
 android_id="@+id/lonText"
 android_layout_width="match_parent"
 android_layout_height="wrap_content"
 android_inputType="numberSigned|numberDecimal"
 android_hint="Longitude"
 android_text="10.2"/>

 <Button
 android_id="@+id/find"
 android_layout_width="match_parent"
 android_layout_height="wrap_content"
 android_text="find"/>

 <TextView
 android_id="@+id/result"
 android_layout_width="match_parent"
 android_layout_height="wrap_content" />
</LinearLayout>

Permission of "android.permission.INTERNET" is needed in AndroidManifest.xml

 <uses-permission android_name="android.permission.INTERNET"/>

Next:
GeoNames also provide Java Client for GeoNames Webservices to help developers to easily access the geonames web services with java. Next post "Get ISO country code for the given latitude/longitude, using GeoNames Java Client" show how to use it in Android Studio project.

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