Scanning for wifi signals only in 2.4Ghz band

Question

I need to scan for available Wi-Fi signals and their strengths. I\'m using wifiManager.startScan(); and asynchronous wifiManager.getScanResult();.

Answer 1

NOTE: These api's are removed from Android Nogut version. Applicable till Mashmallow

/**
 * Auto settings in the driver. The driver could choose to operate on both
 * 2.4 GHz and 5 GHz or make a dynamic decision on selecting the band.
 * @hide
 */
public static final int WIFI_FREQUENCY_BAND_AUTO = 0;

/**
 * Operation on 5 GHz alone
 * @hide
 */
public static final int WIFI_FREQUENCY_BAND_5GHZ = 1;

/**
 * Operation on 2.4 GHz alone
 * @hide
 */
public static final int WIFI_FREQUENCY_BAND_2GHZ = 2;

Use above constants part of WifiManager.java, to set the required frequency bands. And we can set frequency with API setFrequencyBand(int mode, boolean persist). These are hidden API's.

code snippet:

WifiManager wm = (WifiManager)getSystemService(Context.WIFI_SERVICE);

// To scan only 2.4 GHz Frequency band

// true, if this needs to be remembered

wm.setFrequencyBand(2, false);

// Start scan.

wm.startScan();

// To get the frequency band used.

int band = wm.getFrequncyBand();