How to get the WiFi noise level in Android?

Question

     I want to implement an app which measures the quality of the WiFi signal from an indoor environment. From my research I found that the best way to get an accurate measurement is not to get only the RSSI but instead to use the SNR (Signal to Noise Ratio).

How can I obtain the noise level from the Android SDK? As I heard, there is no API available for this. However, I've found a method which provides the SNR (getEvdoSnr()). Unfortunately, this one works only for a GSM/CDMA signal and not for a WiFi connection.

Is anything possible to calculate the SNR in Android? I believe that's doable because I've found an app on Play store (called WiFi SNR) which successfully measures this ratio.

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NOTE: The Android ScanResult doesn't provide the noise level, even if it's specified in the official documentation:

Describes information about a detected access point. In addition to the attributes described here, the supplicant keeps track of quality, noise, and maxbitrate attributes, but does not currently report them to external clients.

Answer 1

Use https://developer.android.com/reference/android/net/wifi/ScanResult.html.

Describes information about a detected access point. In addition to the attributes described here, the supplicant keeps track of quality, noise, and maxbitrate attributes, but does not currently report them to external clients.

I bet something like this will give to you desired information:

WifiManager manager = (WifiManager) getApplication().getSystemService(Context.WIFI_SERVICE);
for (ScanResult result : wifiManager.getScanResults()) {
   // do your stuff
}