NetworkInfo.isConnected() 的替代方法（在 API 23 中弃用）用于网络对象

Question

I want to use ConnectivityManager to check if an active.network can access the inte.net or not ie. getActiveNetworkInfo().isConnected() .

I read that we can still use getActiveNetwork() to get an active.network, but there doesn't seem to be a similar method like isConnected for Network objects. How to workaround?

The deprecated code is found here: https://codelabs.developers.google.com/codelabs/android-training-asynctask-asynctaskloader/index.html?index=..%2F..%2Fandroid-training#4

Answer 1

You can use this method to check the connectivity. connectivityManager.getActiveNetwork() is added in SDK 29.

public static boolean isNetworkAvailable(Context context) {
    if (context == null) return false;

    ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

    if (connectivityManager != null) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
            NetworkCapabilities capabilities = connectivityManager.getNetworkCapabilities(connectivityManager.getActiveNetwork());
            if (capabilities != null) {
                if (capabilities.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR)) {
                    return true;
                }
                if (capabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)) {
                    return true;
                }
                return capabilities.hasTransport(NetworkCapabilities.TRANSPORT_ETHERNET);
            } else {
                return false;
            }
        } else {
            NetworkInfo info = connectivityManager.getActiveNetworkInfo();
            return info != null && info.isConnected();
        }
    }
    return false;
}

Answer 2

In kotlin:

val Context.isNetworkConnected: Boolean
    get() {
        val manager = getSystemService(CONNECTIVITY_SERVICE) as ConnectivityManager
        return if (SDK_INT >= Q)
            manager.getNetworkCapabilities(manager.activeNetwork)?.let {
                it.hasTransport(TRANSPORT_WIFI) || it.hasTransport(TRANSPORT_CELLULAR) ||
                        it.hasTransport(TRANSPORT_BLUETOOTH) ||
                        it.hasTransport(TRANSPORT_ETHERNET) ||
                        it.hasTransport(TRANSPORT_VPN)
            } ?: false
        else
            @Suppress("DEPRECATION")
            manager.activeNetworkInfo?.isConnected == true
    }

Answer 3

NetworkInfo deprecated:https://developer.android.com/reference/android.net/NetworkInfo

• getActiveNetworkInfo deprecated on API 29.
• getAllNetworkInfo deprecated on API 23.

You should use this code.

   private fun isAvailableNetwork(context: Context): Boolean {
        val connectivityManager =
            context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
        val network = connectivityManager.activeNetwork ?: return false
        val networkCapabilities =
            connectivityManager.getNetworkCapabilities(network) ?: return false
        return when {
            networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI) -> true
            networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR) -> true
            networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_ETHERNET) -> true
            networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_BLUETOOTH) -> true
            else -> false
        }
    }