Use Connection to a Socket to check for Internet

Question

I came across this code snippet to check for internet access by opening a Socket-

class InternetCheck extends AsyncTask<Void,Void,Boolean> {

private Consumer mConsumer;
public  interface Consumer { void accept(Boolean internet); }

public  InternetCheck(Consumer consumer) { mConsumer = consumer; execute(); }

@Override protected Boolean doInBackground(Void... voids) { try {
    Socket sock = new Socket();
    sock.connect(new InetSocketAddress("8.8.8.8", 53), 1500);
    sock.close();
    return true;
} catch (IOException e) { return false; } }

@Override protected void onPostExecute(Boolean internet) { mConsumer.accept(internet); }
}

But how do I actually use this AsyncTask? In my MainActivity, I call new InternetCheck().execute(); but how to pass the Consumer param to it? PS - I just started with Android so sorry for being a noob here.

It's always a good idea to read [the documentation](https://developer.android.com/reference/android/os/AsyncTask). Android's docs are pretty good too. — TheWanderer, Jan 28 '19 at 13:49
This code is not correct. It treats too many cases as failures. For example, a `ConnectException: connection refused` would indicate that the Internet is accessible. It also leaks sockets in the failure cases. This doesn't do anything more than `InetAddess.isReachable()`. — user207421, Jan 29 '19 at 04:57

Chandan Sharma · Answer 1 · 2019-01-29T04:43:25.857

3

Simply use new InternetCheck(consumer).execute()

new InternetCheck(new InternetCheck.Consumer() {
            @Override
            public void accept(Boolean internet) {
                Log.d("Internet", "Internet Connection" + internet);
            }
        }).execute();

edited Jan 29 '19 at 04:43

answered Jan 28 '19 at 13:46

Chandan Sharma

2,803
1
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1

The class takes in a `Consumer` parameter, how to pass it? – user8587865 Jan 28 '19 at 13:51
2

@user8587865 https://stackoverflow.com/questions/28417262/java-8-supplier-consumer-explanation-for-the-layperson – TheWanderer Jan 28 '19 at 13:54
@TheWanderer, thanks but I am still unable to process how should I pass `Consumer` – user8587865 Jan 28 '19 at 14:01
@ChandanSharma, please explain how to declare `consumer`. Have you tried running this code? Can you share a minimal example? – user8587865 Jan 28 '19 at 16:21
Please check it again you get the internet connection in accept() method. – Chandan Sharma Jan 29 '19 at 04:44

score 1 · Answer 2 · answered Jan 29 '19 at 04:08

You need to pass the instance of Consumer interface inside your InternetCheck AsyncTask

SAMPLE CODE

 new InternetCheck(new Consumer() {
        @Override
         public void accept(Boolean internet) {
             if(internet){
               Log.e("INTENET_STATUS","Intenet is avilable");
             }else {
               Log.e("INTENET_STATUS","Intenet Not avilable");
             }
        }
  }).execute();

score 0 · Answer 3 · answered Jan 28 '19 at 14:40

0

You can pass consumer parameter like this:

new InternetCheck(mConsumer).execute();

answered Jan 28 '19 at 14:40

DB377

403
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Use Connection to a Socket to check for Internet

3 Answers3