Android Open Source - yousense-android-tracker Wifi Fingerprint

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Back to project page yousense-android-tracker.

License

The source code is released under:

Energy-efficent motion and location tracker for Android. Based on Mattias's power and tracking work. I plan to release it as GPL, once I have a paper published that goes with it. Might also release i...

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Java Source Code

package com.linnap.locationtracker.wifi;
/*from   ww  w. j av a  2s  . co m*/
import java.util.HashSet;
import java.util.List;

import com.linnap.locationtracker.SensorConfig;

import android.net.wifi.ScanResult;
import com.linnap.locationtracker.Sets;

public class WifiFingerprint {

  HashSet<String> binnedBssids;
  
  public WifiFingerprint(List<ScanResult> results) {
    binnedBssids = new HashSet<String>();
    for (ScanResult result : results)
      binnedBssids.add(binnedBssid(result));
  }
  
  /**
   * Returns similarity to other fingerprint within range [0,1].
   * High value: probably same place.
   * Low value: probably different place.
   * 
   * If both fingerprints are empty sets, returns 0.0, as there is no way to tell for sure.
   */
  public double similarity(WifiFingerprint other) {
    if (binnedBssids.size() == 0 && other.binnedBssids.size() == 0)
      return 0.0;
    else
      return Sets.tanimotoSimilarity(binnedBssids, other.binnedBssids);
  }
  
  private static String binnedBssid(ScanResult result) {
    return (result.level > SensorConfig.WIFI_MIN_STRONG_RSSI ? "strong_" : "weak_") + result.BSSID;
  }
}

Java Source Code List