Android 检查是否有网络

    @Suppress("DEPRECATION")
    private fun checkIfOnline(): Boolean {
        val cm = getSystemService(context, ConnectivityManager::class.java)

        return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            val capabilities = cm?.getNetworkCapabilities(cm.activeNetwork) ?: return false
            capabilities.hasCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET) &&
                capabilities.hasCapability(NetworkCapabilities.NET_CAPABILITY_VALIDATED)
        } else {
            cm?.activeNetworkInfo?.isConnectedOrConnecting == true
        }
    }