checkWiFi_in2020.kt

https://stackoverflow.com/a/53243938/6352712

@IntRange(from = 0, to = 3)
fun getConnectionType(context: Context): Int {
    var result = 0 // Returns connection type. 0: none; 1: mobile data; 2: wifi
    val cm = context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager?
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        cm?.run {
            cm.getNetworkCapabilities(cm.activeNetwork)?.run {
                if (hasTransport(NetworkCapabilities.TRANSPORT_WIFI)) {
                    result = 2
                } else if (hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR)) {
                    result = 1
                } else if (hasTransport(NetworkCapabilities.TRANSPORT_VPN)){
                    result = 3
                }
            }
        }
    } else {
        cm?.run {
            cm.activeNetworkInfo?.run {
                if (type == ConnectivityManager.TYPE_WIFI) {
                    result = 2
                } else if (type == ConnectivityManager.TYPE_MOBILE) {
                    result = 1
                } else if(type == ConnectivityManager.TYPE_VPN) {
                    result = 3
                }
            }
        }
    }
    return result
}