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    <p>At first, You put a class like following:</p> <pre><code>public class AsyncHttpPost extends AsyncTask&lt;String, String, String&gt; { interface Listener { void onResult(String result); } private Listener mListener; private HashMap&lt;String, String&gt; mData = null;// post data /** * constructor */ public AsyncHttpPost(HashMap&lt;String, String&gt; data) { mData = data; } public void setListener(Listener listener) { mListener = listener; } /** * background */ @Override protected String doInBackground(String... params) { byte[] result = null; String str = ""; HttpClient client = new DefaultHttpClient(); HttpPost post = new HttpPost(params[0]);// in this case, params[0] is URL try { // set up post data ArrayList&lt;NameValuePair&gt; nameValuePair = new ArrayList&lt;NameValuePair&gt;(); Iterator&lt;String&gt; it = mData.keySet().iterator(); while (it.hasNext()) { String key = it.next(); nameValuePair.add(new BasicNameValuePair(key, mData.get(key))); } post.setEntity(new UrlEncodedFormEntity(nameValuePair, "UTF-8")); HttpResponse response = client.execute(post); StatusLine statusLine = response.getStatusLine(); if(statusLine.getStatusCode() == HttpURLConnection.HTTP_OK){ result = EntityUtils.toByteArray(response.getEntity()); str = new String(result, "UTF-8"); } } catch (UnsupportedEncodingException e) { e.printStackTrace(); } catch (Exception e) { } return str; } /** * on getting result */ @Override protected void onPostExecute(String result) { // something... if (mListener != null) { mListener.onResult(result) } } } </code></pre> <p>Now. You just write some lines like following:</p> <pre><code>HashMap&lt;String, String&gt; data = new HashMap&lt;String, String&gt;(); data.put("key1", "value1"); data.put("key2", "value2"); AsyncHttpPost asyncHttpPost = new AsyncHttpPost(data); asyncHttpPost.setListener(new AsyncHttpPost.Listener(){ @Override public void onResult(String result) { // do something, using return value from network } }); asyncHttpPost.execute("http://example.com"); </code></pre>
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