Check NetworkConnectivity in JAVA

Add This method

public static boolean isNetworkConnected(Context context) {
        ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            android.net.Network network = connectivityManager.getActiveNetwork();
            if (network == null) return false;

            NetworkCapabilities networkCapabilities = connectivityManager.getNetworkCapabilities(network);
            if (networkCapabilities == null) return false;

            if (networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)) {
                return true;
            } else if (networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR)) {
                return true;
            } else if (networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_ETHERNET)) {
                return true;
            }
            return false;
        } else {
            NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
            return networkInfo != null && networkInfo.isConnected();
        }
    }

Add this permission to manifest

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

How you can use that method

 if (isNetworkConnected(context)) {
            // Network is connected
            // Your code here
        } else {
            // Network is not connected
            // Your code here
        }