Android - Programmatically check internet connection and display dialog if notConnected

Question

I am working on a live project. and when user click on the app. the welcome screen appears(there is a webview on that screen). and if the internet is not connected then the

Answer 1

This cup of code helps you to check internet connection available or not from the API level 16 to 30

@SuppressWarnings("deprecation")
public static boolean isInternetAvailable(Activity activity) {
    ConnectivityManager conMgr = (ConnectivityManager) activity.getSystemService(Context.CONNECTIVITY_SERVICE);

    if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        Network network = conMgr.getActiveNetwork();
        NetworkCapabilities networkCapabilities = conMgr.getNetworkCapabilities(network);
        if (networkCapabilities != null) {
            return networkCapabilities.hasCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET);
        } else return false;
    } else {
        // below API Level 23
        return conMgr.getActiveNetworkInfo() != null
                && conMgr.getActiveNetworkInfo().isAvailable()
                && conMgr.getActiveNetworkInfo().isConnected();
    }
}

Answer 2

I've tried different methods described above, besides it I've been caught in some cases. So finally, I'm using below code snippet to make a network call...

try {
    InetAddress address = InetAddress.getByName("www.stackoverflow.com");
    //Connected to working internet connection
} catch (UnknownHostException e) {
    e.printStackTrace();
    //Internet not available
}

This can be useful in many perspectives. If something is not fine in this approach, please let me know.

Answer 3

if (InternetConnection.checkConnection(context)) {
    // Internet Available...
} else {
    // Internet Not Available...
}

just copy below class

public class InternetConnection {

    /** CHECK WHETHER INTERNET CONNECTION IS AVAILABLE OR NOT */
    public static boolean checkConnection(Context context) {
        final ConnectivityManager connMgr = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

        NetworkInfo activeNetworkInfo = connMgr.getActiveNetworkInfo();

        if (activeNetworkInfo != null) { // connected to the internet
            Toast.makeText(context, activeNetworkInfo.getTypeName(), Toast.LENGTH_SHORT).show();

            if (activeNetworkInfo.getType() == ConnectivityManager.TYPE_WIFI) {
                // connected to wifi
                return true;
            } else if (activeNetworkInfo.getType() == ConnectivityManager.TYPE_MOBILE) {
                // connected to the mobile provider's data plan
                return true;
            }
        }
        return false;
    }
}

Give following permission to manifest

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />

Answer 4

Internet connection also check either in onCreate() or onResume() method. There is no need to call inside the AsyncTask.

or You can call before call the AsyncTask execute() method

if(isOnline)
{
   MyAsyncTask task=new MyAMyAsyncTask();
   task.execute();

}

else
{
// no internet connection
}

Answer 5

Check internet connection

 ConnectivityManager mgr = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
 NetworkInfo netInfo = mgr.getActiveNetworkInfo();

        if (netInfo != null) {
            if (netInfo.isConnected()) {
                // Internet Available
            }else {
               //No internet
            }
        } else {
            //No internet
        }

Answer 6

doInBackground runs on a different Thread than the main UI, so you can't create a show a dialog here. Instead, override onPreExecute in your AsyncTask, and do the test there.