Android Open Source - Rejsekort-Reminder Cell Sensor

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License

The source code is released under:
GNU General Public License
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Java Source Code

package com.example.publictransportation.sensors;
// w  ww  .  jav  a2s  .c o m
import android.content.Context;
import android.telephony.CellLocation;
import android.telephony.PhoneStateListener;
import android.telephony.SignalStrength;
import android.telephony.TelephonyManager;
import android.telephony.gsm.GsmCellLocation;
import android.util.Log;

import com.example.publictransportation.modes.AbstractMode;

/*
 * This mode either outputs the connected cell id or NOTHING_FOUND.
 * 
 */
public class CellSensor extends AbstractSensor {

  TelephonyManager telephonyManager;
  CellListener listener;
  int[] whitelistedCells;
  int[] blacklistedCells;
  String area;

  final int SIGNAL_STRENGTH_LIMIT = -95;
  int cellSignalstrength;

  public static final String NOTHING_FOUND = "NOTHING_FOUND";

  public CellSensor(AbstractMode parentMode, int[] whitelistedCells, int[] blacklistedCells, String area) {
    super(parentMode);

    this.whitelistedCells = whitelistedCells;
    this.blacklistedCells = blacklistedCells;
    this.area = area;

    // registers a new listener for cell location
    telephonyManager = (TelephonyManager) parentMode.getContext().getSystemService(Context.TELEPHONY_SERVICE);
    listener = new CellListener();
    telephonyManager.listen(listener, PhoneStateListener.LISTEN_CELL_LOCATION | PhoneStateListener.LISTEN_SIGNAL_STRENGTHS);
  }

  @Override
  public void kill() {
    // deregister the listener
    telephonyManager.listen(listener, PhoneStateListener.LISTEN_NONE);
  }

  // accesses the phone location info to listen for cell location changes
  // upon each change, output() is called
  class CellListener extends PhoneStateListener {

    @Override
    public void onCellLocationChanged(CellLocation location) {

      // use correct subclass (GSM is used in Europe)
      GsmCellLocation gsmLocation = (GsmCellLocation) location;

      if (cellSignalstrength > SIGNAL_STRENGTH_LIMIT) {
        // save the current cell id and check it
        checkCellId(gsmLocation.getCid());
        Log.i("Signal Strength","Cell signal:"+cellSignalstrength);
      }
    }

    @Override
    public void onSignalStrengthsChanged(SignalStrength signalStrength) {
      cellSignalstrength = getSignalStrength(signalStrength);
    }
  }

  // Returns 3G or 4G signal strength
  protected int getSignalStrength(SignalStrength signal) {

    String ssignal = signal.toString();
    String[] parts = ssignal.split(" ");

    int dB = -120; // No Signal Measured when returning -120 dB

    // If LTE 
    if (telephonyManager.getNetworkType() == TelephonyManager.NETWORK_TYPE_LTE){

      int ltesignal = Integer.parseInt(parts[9]);

      // check to see if it get's the right signal in dB, a signal below -2
      if(ltesignal < -2) {
        dB = ltesignal;
      }
    }
    // Else 3G
    else {

      if (signal.getGsmSignalStrength() != 99) {

        int strengthInteger = -113 + 2 * signal.getGsmSignalStrength();
        dB = strengthInteger;  
      }
    }

    return dB;
  }

  // check some cell against the list of whitelisted cells
  // and blacklisted cells
  private void checkCellId(int cellId) {

    Boolean foundBlacklistedCell = false;

    // ignore blacklisted cells
    for (int i = 0; i < blacklistedCells.length; i++) {
      if (cellId == blacklistedCells[i]) {
        foundBlacklistedCell = true;
        break;
      }
    }
    
    // only output something if cell was not in blacklist
    if (!foundBlacklistedCell) {
      
      String cell = "";
      
      for (int i = 0; i < whitelistedCells.length; i++) {
        if (cellId == whitelistedCells[i]) {
          cell = cellId+"";
          break;
        }
      }

      if (cell.isEmpty()) {
        output(NOTHING_FOUND);
      }
      else {
        output(cell);
      }
    }
  }

  @Override
  public SensorTypes getType() {
    return SensorTypes.CELL;
  }

  @Override
  public String getLabel() {
    return area;
  }

}
Java Source Code List
