Combined GET and POST requests HttpURLConnection

Question

I am looking for some advise about the following, I have a HttpUtil class (util) in which I have my sendGetRequest- and sendPostRequest methods. I use them to perform a successfull login to a website from which I am going to fetch some data. Now, I call these methods in my MainActivity in a Asynctask:

protected Boolean doInBackground(Void... params) { try { //1. GET request util.sendGetRequest(loginURL, null); //2. Post request util.sendPostRequest(loginURL, null); //3. Final GET request util.sendGetRequest(resultURL, null); // Read stream String[] response = util.readMultipleLinesRespone(); for (String line : response) { System.out.println(line); } } catch (InterruptedException e) { return false; } catch (Exception e) { e.printStackTrace(); } }

I am looking for a solution so that one waits for another to finish (1st get then post, finally get), if it`s possible I want to keep this util.class intact and not put everything in the Asynctask (doInBackground). Is this possible or do I have the wrong approach?

Your opinions and advise please.

Thank you in advance.

Eenvincible · Accepted Answer · 2015-12-29 21:22:34Z

The approach I normally use is this:

First, consider using an Event for instance a library like this that will not only decouple your code but also make it so easy to notify your activity when the first HttpGet request is completed.
Next, start your GET request inside doInBackground and then notify your activity once the process is completed - normally inside onPostExecute
When in your activity, assuming you use the EventBus library, you can execute the next AsyncTask which will do your next task like doing a POST request accordingly.

Using this approach should really make your life easier - specifically helps you know when something is completed and so you can proceed with the next task as needed.

Good luck!

Thx Eenvincible, "event" is the keyword indeed, nice library. Thx for the info.
You can take this a notch up by showing a progress dialog whenever an operation is ongoing like inside onPreExecute() and dismiss it onPostExecute - helps users know that something is happening and should wait
That was my intention anyhow, already got a progress dialog in place :)

android_eng · Accepted Answer · 2015-12-29 21:23:02Z

You can have two AsyncTasks. One for get and other for post. First execute get request. Then in onPostExecute of the first AsyncTask execute the second AsyncTask that sends the post request in doInBackground();

Rediska · Accepted Answer · 2015-12-29 21:30:35Z

Your HttpUtil class should somehow signal that the response is received. For example, put this code in HttpUtil to signal end of operation:

synchronized (this) { done = true; notifyAll(); }

and this code will wait for the operation to end:

while(!util.isDone()) { try { synchronized(util) { util.wait(); } } catch(Exception e) { ... } }

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