NetworkUtils.java

package com.mobyta.common;

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.support.annotation.NonNull;

import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;

/**
 * A network utility class to check for Internet access and connectivity
 */

public class NetworkUtils {
    /**
     * Check for Network connection status, if boolean is true it will also check for Internet access
     *
     * @param context
     * @param networkListener
     */
    public static void checkInternetConnection(@NonNull Context context, @NonNull NetworkListener networkListener, @NonNull boolean checkForInternetAccess) {
        boolean isConnectToInternet = isNetworkConnected(context);
        if (checkForInternetAccess && isConnectToInternet) {
            hasInternetAccess(networkListener);
        } else {
            networkListener.updateNetworkState(isConnectToInternet);
        }
    }

    private static boolean isNetworkConnected(Context context) {
        ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
        return (networkInfo != null && networkInfo.isConnectedOrConnecting());
    }

    private static void hasInternetAccess(final NetworkListener networkListener) {
        new Thread() {
            public void run() {
                try {
                    HttpURLConnection urlc = (HttpURLConnection)
                            (new URL("http://clients3.google.com/generate_204")
                                    .openConnection());
                    urlc.setRequestProperty("User-Agent", "Android");
                    urlc.setRequestProperty("Connection", "close");
                    urlc.setConnectTimeout(1500);
                    urlc.connect();
                    if ((urlc.getResponseCode() == 204 &&
                            urlc.getContentLength() == 0)) {
                        networkListener.updateNetworkState(true);
                    } else {
                        networkListener.updateNetworkState(false);
                    }
                } catch (IOException e) {
                    networkListener.updateNetworkState(false);
                }
            }
        }.start();
    }

    public interface NetworkListener {
        void updateNetworkState(boolean status);
    }
}