Android Programming: Send data via HTTP POST request
Tutorial by Progger99 | 2012-11-20 at 22:43
Android makes it easy for us to send data via HTTP POST to any website on the net. In this small tutorial, I will show you how to do it.
First, we need to get the necessary permissions. For that, we are writing the following line in the AndroidManifest.xml:
<uses-permission android:name="android.permission.INTERNET" />
Without this line, our app can not access the internet later.
Next, we need two objects, a "client" and our "post". As a parameter, we pass the address of the script to our "post", to which the data should be sent later:
HttpClient client = new DefaultHttpClient(); HttpPost post = new HttpPost("http://www.example.com/script.php");
Before we start, we need a list containing our data, we would like to send. We take a "NameValuePair" list for that, so that we can define the names and the applicable related values.
List<NameValuePair> postlist = new ArrayList<NameValuePair>(); postlist.add(new BasicNameValuePair("key1", "value1")); postlist.add(new BasicNameValuePair("key2", "value2"));
Next, we are using setEnitity() and UrlEncodedFormEntity to assign the list to our "post" in the right form.
try { post.setEntity(new UrlEncodedFormEntity(postlist)); } catch (UnsupportedEncodingException e) { throw new AssertionError("Encoding Error"); // or Toast.makeText(this, e.toString(), Toast.LENGTH_LONG).show(); }
Finally, we only need to run the POST request. We use the following line fot that:
try { HttpResponse response = client.execute(post); } catch (ClientProtocolException e) { throw new AssertionError("Client Protocol Error"); // or Toast.makeText(this, e.toString(), Toast.LENGTH_LONG).show(); } catch (IOException e) { throw new AssertionError("IO Error"); // or Toast.makeText(this, e.toString(), Toast.LENGTH_LONG).show(); }
We get back a HTTP response object that contains our response of the script. If we want, of course, we can also process and analyze this return object to get a feedback about the query.
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