CDACians India: Convert cellLocation to real location (Latitude and Longitude), using "http://www.google.com/glm/mmap"

Tuesday 7 August 2012

Convert cellLocation to real location (Latitude and Longitude), using "http://www.google.com/glm/mmap"

The post "Get cell location on a GSM phone, getCellLocation()" get cell id and location area code. It's not a useful info with converted to real location.

"http://www.google.com/glm/mmap" is a non-public API to convert cellLocation to latitude and longitude. Some nice guy developed the method to retrieve location from cellLocation.

We need the following permission in this example:
android.permission.ACCESS_COARSE_LOCATION
android.permission.ACCESS_FINE_LOCATION
android.permission.READ_PHONE_STATE
android.permission.INTERNET

?

package com.AndroidTelephonyManager;

import java.io.DataInputStream;

import java.io.DataOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.net.HttpURLConnection;

import java.net.URL;

import java.net.URLConnection;

import android.app.Activity;

import android.content.Context;

import android.os.Bundle;

import android.telephony.TelephonyManager;

import android.telephony.gsm.GsmCellLocation;

import android.widget.TextView;

public class AndroidTelephonyManager extends Activity {

int myLatitude, myLongitude;

  /** Called when the activity is first created. */

  @Override

  public void onCreate(Bundle savedInstanceState) {

      super.onCreate(savedInstanceState);

      setContentView(R.layout.main);

      TextView textGsmCellLocation = (TextView)findViewById(R.id.gsmcelllocation);

      TextView textCID = (TextView)findViewById(R.id.cid);

      TextView textLAC = (TextView)findViewById(R.id.lac);

      TextView textGeo = (TextView)findViewById(R.id.geo);

      //retrieve a reference to an instance of TelephonyManager

      TelephonyManager telephonyManager = (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);

      GsmCellLocation cellLocation = (GsmCellLocation) telephonyManager.getCellLocation();

      int cid = cellLocation.getCid();

      int lac = cellLocation.getLac();

      textGsmCellLocation.setText(cellLocation.toString());

      textCID.setText("gsm cell id: " + String.valueOf(cid));

      textLAC.setText("gsm location area code: " + String.valueOf(lac));

      if(RqsLocation(cid, lac)){

       textGeo.setText(

            String.valueOf((float)myLatitude/1000000)

            + " : "

            + String.valueOf((float)myLongitude/1000000));

      }else{

       textGeo.setText("Can't find Location!");

      }

  }

  private Boolean RqsLocation(int cid, int lac){

   Boolean result = false;

   String urlmmap = "http://www.google.com/glm/mmap";

      try {

       URL url = new URL(urlmmap);

          URLConnection conn = url.openConnection();

          HttpURLConnection httpConn = (HttpURLConnection) conn;      

          httpConn.setRequestMethod("POST");

          httpConn.setDoOutput(true);

          httpConn.setDoInput(true);

  httpConn.connect();

  OutputStream outputStream = httpConn.getOutputStream();

        WriteData(outputStream, cid, lac);

        InputStream inputStream = httpConn.getInputStream();

        DataInputStream dataInputStream = new DataInputStream(inputStream);

        dataInputStream.readShort();

        dataInputStream.readByte();

        int code = dataInputStream.readInt();

        if (code == 0) {

         myLatitude = dataInputStream.readInt();

         myLongitude = dataInputStream.readInt();

            result = true;

        }

 } catch (IOException e) {

  // TODO Auto-generated catch block

  e.printStackTrace();

 }

 return result;

  }

  private void WriteData(OutputStream out, int cid, int lac)

  throws IOException

  {    

      DataOutputStream dataOutputStream = new DataOutputStream(out);

      dataOutputStream.writeShort(21);

      dataOutputStream.writeLong(0);

      dataOutputStream.writeUTF("en");

      dataOutputStream.writeUTF("Android");

      dataOutputStream.writeUTF("1.0");

      dataOutputStream.writeUTF("Web");

      dataOutputStream.writeByte(27);

      dataOutputStream.writeInt(0);

      dataOutputStream.writeInt(0);

      dataOutputStream.writeInt(3);

      dataOutputStream.writeUTF("");

      dataOutputStream.writeInt(cid);

      dataOutputStream.writeInt(lac);   

      dataOutputStream.writeInt(0);

      dataOutputStream.writeInt(0);

      dataOutputStream.writeInt(0);

      dataOutputStream.writeInt(0);

      dataOutputStream.flush();    

  }

}

?

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

  android:orientation="vertical"

  android:layout_width="fill_parent"

  android:layout_height="fill_parent"

  >

<TextView

  android:layout_width="fill_parent"

  android:layout_height="wrap_content"

  android:text="@string/hello"

  />

<TextView

  android:id="@+id/gsmcelllocation"

  android:layout_width="fill_parent"

  android:layout_height="wrap_content"

  />

<TextView

  android:id="@+id/cid"

  android:layout_width="fill_parent"

  android:layout_height="wrap_content"

  />

<TextView

  android:id="@+id/lac"

  android:layout_width="fill_parent"

  android:layout_height="wrap_content"

  />

<TextView

  android:id="@+id/geo"

  android:layout_width="fill_parent"

  android:layout_height="wrap_content"

  />

</LinearLayout>

akm

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