Android Open Source - mitlocate M I T Location Service

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Back to project page mitlocate.

License

The source code is released under:

MIT License

Java Source Code

package edu.mit.locate;
//from   w  w w . ja  v a2s. co  m
import java.io.UnsupportedEncodingException;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.SharedPreferences;
import android.net.wifi.ScanResult;
import android.net.wifi.WifiManager;
import android.os.Handler;
import android.os.IBinder;
import android.support.v4.content.LocalBroadcastManager;
import android.util.Log;
import android.widget.Toast;

public class MITLocationService extends Service {
  private WifiManager wifi;
  private SharedPreferences prefs;
  public static final String BROADCAST_LOCATOR = "edu.mit.locate.locator";
  static final String BROADCAST_ADDLOCATION = "edu.mit.locate.addlocation";
  private final Handler handler = new Handler();
  protected Intent broadcastIntent;
  private PendingIntent pi;
  private AlarmManager am;
  private boolean add = false;
  private final String TAG = "MITLocationService";
  private String building, desc;

  @Override
  public void onCreate() {
    super.onCreate();
    wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);
    prefs = getSharedPreferences("MITLOCATE", 0);
    Intent MITLocationServiceIntent = new Intent(this, MITLocationService.class);
    pi = PendingIntent.getService(this, 1, MITLocationServiceIntent, PendingIntent.FLAG_UPDATE_CURRENT);
    registerReceiver(WiFiScanBR, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
  }

  @Override
  public int onStartCommand(Intent intent, int flags, int startId) {
    if(prefs.getInt("Authorization",0)<1)
      stopSelf();
    //am.setInexactRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP,10*1000,prefs.getInt("UpdateFrequency",5)*60*1000,pi);
    if(intent != null && intent.getBooleanExtra("add",false)){ //NPE here
      add=true;
      broadcastIntent = new Intent(BROADCAST_ADDLOCATION);
      building = intent.getStringExtra("building");
      desc = intent.getStringExtra("desc");
    } else
      broadcastIntent = new Intent(BROADCAST_LOCATOR);
    handler.removeCallbacks(getLocation);
    handler.post(getLocation);
    return super.onStartCommand(intent, flags, startId);
  }

  private Runnable getLocation = new Runnable() {
    public void run() {
      wifi.startScan();
    }
  };

  //Processes the scan results from WiFiManager, hands them over to MITHttpsClient for analysis
  final BroadcastReceiver WiFiScanBR = new BroadcastReceiver() {
    public void onReceive(Context c, Intent intent) {
      List<ScanResult> results = wifi.getScanResults();
      JSONObject params = new JSONObject();
      JSONArray aps = new JSONArray();
      try {
        params.put("UUID", prefs.getString("DeviceID",null));
        for(int i = 0;i < results.size();i++){
          final ScanResult result = results.get(i);
          JSONObject ap = new JSONObject();
          ap.put("bssid", result.BSSID.replace(":", ""));
          ap.put("signal", Integer.toString(-result.level));
          ap.put("ssid", result.SSID);
          aps.put(ap);
        }
        params.put("aps", aps);
        if(aps.length()>0){
          params.put("aps", aps);
          new MITHttpsClient("heartbeat", getApplicationContext(), false){
            @Override
            protected void onPostExecute(JSONObject response){
              if(response!=null){
                broadcastIntent.putExtra("response", response.toString());
                LocalBroadcastManager.getInstance(getApplicationContext()).sendBroadcast(broadcastIntent);
                stopSelf();
              }
            }
          }.execute(params);
        }
      } catch (JSONException je){
        Log.e(TAG, "JSONException in WiFiScanBR");
      }
    }
  };

  protected void beam(JSONObject jsonParams) throws JSONException, UnsupportedEncodingException {
    if(add){
      jsonParams.put("building", building);
      jsonParams.put("desc", desc);
      new MITHttpsClient("add", getApplicationContext(), false){
        @Override
        protected void onPostExecute(JSONObject response){
          if(response!=null){
            broadcastIntent.putExtra("response", response.toString());
            LocalBroadcastManager.getInstance(getApplicationContext()).sendBroadcast(broadcastIntent);
            stopSelf();
          } else {
            Toast.makeText(MITLocationService.this, response.toString(), Toast.LENGTH_SHORT).show();
          }
        }
      }.execute(jsonParams);
      //      new MITHttpsClient(this.getApplicationContext(), "add/", jsonParams, new JsonHttpResponseHandler() {
      //        @Override
      //        public void onSuccess(String response) {
      //          broadcastIntent.putExtra("response", response);
      //        }
      //        @Override
      //        public void onFailure(Throwable e, String response) {
      //          broadcastIntent.putExtra("response", "failed");
      //        }
      //        @Override
      //        public void onFinish() {
      //          Log.e(TAG,"FINISHED");
      //          
      //        }
      //      });

    }
  }

  //Processes the location result from MITHttpsClient (broadcasts to LocationServiceBR in MainActivity)
  //  final BroadcastReceiver HTTPResponseProcessorBR = new BroadcastReceiver() {
  //    public void onReceive(Context context, Intent intent) {
  //      String response = intent.getStringExtra("response");
  //      int responseCode = intent.getIntExtra("responseCode",404);
  //      String failure = intent.getStringExtra("failure");
  //      if(failure!=null){
  //        Log.e(TAG, "A fail: "+failure);
  //      }else if(responseCode==200){
  //        BroadcastIntent.putExtra("location", response);
  //      } else {
  //        BroadcastIntent.putExtra("location", "Non-200 HTTP Response");
  //        Log.w(TAG,"HTTP error "+responseCode);
  //      }
  //      Log.d(TAG,response);
  //      LocalBroadcastManager.getInstance(context).sendBroadcast(BroadcastIntent);
  //      stopSelf();
  //    }
  //  };

  @Override
  public IBinder onBind(Intent intent) {
    return null;
  }

  @Override
  public void onDestroy() {
    unregisterReceiver(WiFiScanBR);
    handler.removeCallbacks(getLocation);
    super.onDestroy();
  }
}

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