Issue with WifiManager.calculateSignalLevel(RSSI, 5)

Question

I am trying to use the Wifimanager to calculate the Signal Level of the access points found during a scan.

I am using the following method:

WifiManager.calculateSignalLevel(int, int)

But it appears to always return the same int no matter what the RSSI level is.

Here is my code:

---

public int calculateQoS(int aRSSI){

    signalLevel = WifiManager.calculateSignalLevel(RSSI, 5);

    return signalLevel;

}

---

public void testCalculateQoS(){

            Log.d("signal", "signal = : "
                    + connMonitor.calculateQoS(-44)
                    + " " + connMonitor.calculateQoS(-80)
                    + " " + connMonitor.calculateQoS(-120)
                    + " " + connMonitor.calculateQoS(-20));

        }

The logging outputs 1 for all the test cases for calculateQoS(int).

Am I missing something simple here? Why is the SignalLevel always 1?

Answer 1

It seems that calculateSignalLevel is implemented this way:

public static int calculateSignalLevel(int rssi, int numLevels) {
  if (rssi <= MIN_RSSI) {
      return 0;
  } else if (rssi >= MAX_RSSI) {
      return numLevels - 1;
  } else {
      int partitionSize = (MAX_RSSI - MIN_RSSI) / (numLevels - 1);
      return (rssi - MIN_RSSI) / partitionSize;
  }
}

Maybe this code snippet can explain your problem. Also note:

http://code.google.com/p/android/issues/detail?id=2555