判断WiFi是2.4GHZ还是5GHZ

WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
WifiInfo wifiInfo = wifiManager.getConnectionInfo();
String tempSsidString = wifiInfo.getSSID();
if (tempSsidString != null && tempSsidString.length() > 2) {
String wifiSsid = tempSsidString.substring(1, tempSsidString.length() - 1);
List<ScanResult> scanResults=wifiManager.getScanResults();
for(ScanResult scanResult:scanResults){
if(scanResult.SSID.equals(wifiSsid)){
//返回4个数字，2开头的话就是2.4G,5开头的话就是5G
int frequency = scanResult.frequency;
break;
}
}
}

WifiManager wifiManager = (WifiManager) mContext.getSystemService(Context.WIFI_SERVICE);
List<ScanResult> scanResults=wifiManager.getScanResults();
for(ScanResult scanResult:scanResults){
if(scanResult.SSID.equals(ssid)){//ssid  当前连接的wifi
//返回4个数字，2开头的话就是2.4G,5开头的话就是5G
int frequency = scanResult.frequency;
if((frequency+"").startsWith("2")){  //2.4G
//2.4G TODO
}else if((frequency+"").startsWith("5")){
//5G  TODO
}
}
}