Android – Log network SSID’s and DBM

Technically, this could be used to trilaterate over time and heatmap where associates spend their time, as well as what activity occurs where. To do this, we would need the coordinates of all AP’s in the given store.

The endpoint was an AWS Lambda function which pushed the data into an AWS dynamodb table.

Main Activity

package com.appcrawler.networklogger;

import android.support.v7.app.AppCompatActivity;
import android.support.v4.app.ActivityCompat;
import android.os.Bundle;
import java.util.HashMap;
import java.util.ArrayList;
import java.util.List;
import android.util.Log;
import android.widget.TextView;

import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.NameValuePair;
import org.apache.http.HttpResponse;
import org.apache.http.impl.client.DefaultHttpClient;

public class MainActivity extends AppCompatActivity {

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    boolean permissionGranted = ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) == android.content.pm.PackageManager.PERMISSION_GRANTED;
    ActivityCompat.requestPermissions(this, new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION}, 200);
    setContentView(R.layout.activity_main);
    final WifiReceiver LocalWireless = new WifiReceiver(this.getApplicationContext());


    try {

      while (true) {
        Thread.sleep(15000);
        HashMap wireless = LocalWireless.getWifiStrength();
        for (String key : wireless.keySet()) {
          Log.d("NETWORKLOGGER",key + " " +wireless.get(key));
          String[] s = {key, wireless.get(key).toString()};
          new PostNetwork().execute(s);
        }
      }
    }
    catch (Exception e) {
      Log.d("ERROR",e.getMessage());
    }
  }
}

The wifi receiver

package com.appcrawler.networklogger;

import android.content.Context;
import android.net.wifi.WifiManager;
import android.net.wifi.ScanResult;
import java.util.HashMap;
import java.util.List;
import android.util.Log;

class WifiReceiver {
    Context cxt=null;
    public WifiReceiver(Context c){
        this.cxt=c;
    }

    public HashMap getWifiStrength(){
        WifiManager wifiManager = (WifiManager) cxt.getSystemService(Context.WIFI_SERVICE);
        List wifiList = wifiManager.getScanResults();
        Log.d("WIFI",wifiList.toString());

        HashMap wireless=new HashMap();

        for(int i=0; i< wifiList.size() ;i++) {
            ScanResult scanResult= wifiList.get(i);
            //int level = WifiManager.calculateSignalLevel(scanResult.level, 500);
            int level = wifiList.get(i).level;

            String SSID = scanResult.SSID;
            wireless.put(SSID,level);
        }
        return wireless;
    }
}

The async class

package com.appcrawler.networklogger;

import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.entity.StringEntity;
import org.json.JSONObject;
import android.os.AsyncTask;
import java.util.ArrayList;
import java.util.List;
import android.util.Log;
import java.io.BufferedReader;
import java.io.InputStreamReader;

public class PostNetwork  extends AsyncTask{

  @Override
  public String doInBackground(String... params) {
      HttpClient httpclient = new DefaultHttpClient();
      HttpPost httppost = new HttpPost("https://your_api_endpoint_to_which_you_post_the_json_below");
      httppost.addHeader("content-type", "application/json");
      HttpResponse response = null;
      StringBuilder str = new StringBuilder();
      try {
          JSONObject json = new JSONObject();
          json.put("network", params[0]);
          json.put("dbm", params[1]);
          StringEntity param = new StringEntity(json.toString());
          httppost.setEntity(param);
          response = httpclient.execute(httppost);
          BufferedReader reader = new BufferedReader(new InputStreamReader(response.getEntity().getContent(), "UTF-8"));

          String line = null;
          try {
              while ((line = reader.readLine()) != null) {
                  str.append(line + "\n");
              }
          } catch (Exception e) {
              throw e;
          }
          Log.d("RESPONSE",str.toString());
      }
      catch (Exception e) {
        Log.d("ERROR",e.getMessage());
      }
      return response.toString();
  }

  @Override
  protected void onPostExecute(String result) {}

  @Override
  protected void onPreExecute() {}

  @Override
  protected void onProgressUpdate(String... text) {}

}

The android manifest

The build.gradle for the app

apply plugin: 'com.android.application'

android {
    compileSdkVersion 26
    useLibrary 'org.apache.http.legacy'
    defaultConfig {
        applicationId "com.appcrawler.networklogger"
        minSdkVersion 26
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        multiDexEnabled true
    }
    dependencies {
        compile 'org.apache.httpcomponents:httpcore:4.4.1'
        compile 'org.apache.httpcomponents:httpclient:4.5'
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }

    packagingOptions {
      exclude 'META-INF/DEPENDENCIES'
    }
}


dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:26.1.0'
    implementation 'com.android.support.constraint:constraint-layout:1.0.2'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.1'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
}