Create your application and "Incoming WebHooks" url with token.
Put "getInstance()"
/* * Made by ShakeJ (shakejj@gmail.com). Send message to slack's channel. Use * 'Incoming WebHooks' http://mnworld.co.kr Search 'ShakeJ' in google play :) */ public class SlackMessageUtil { protected String siteUrl; private volatile static SlackMessageUtil uniqueInstance; private SlackMessageUtil(String incomingWebHookUrl) { this.siteUrl = incomingWebHookUrl; } public static SlackMessageUtil getInstance(Context context, String incomingWebHookUrl) { if (uniqueInstance == null) synchronized (SlackMessageUtil.class) { if (uniqueInstance == null) uniqueInstance = new SlackMessageUtil(incomingWebHookUrl); } return uniqueInstance; } @SuppressWarnings("unchecked") public void sendMessage(String channel, String message, String name) { JSONObject obj = new JSONObject(); try { obj.put("channel", channel); obj.put("username", name); obj.put("text", message); } catch (JSONException e) { e.printStackTrace(); } Listparams = new ArrayList (); params.add(new BasicNameValuePair("payload", obj.toString())); new RequestAsyncTask().execute(params); } private class RequestAsyncTask extends AsyncTask , Integer, Boolean> { @Override protected Boolean doInBackground(List... params) { boolean result = false; try { DefaultHttpClient client = new DefaultHttpClient(); HttpRequestBase requestBase = null; requestBase = new HttpPost(siteUrl); ((HttpPost) requestBase).setHeader("Content-Type", "application/x-www-form-urlencoded"); ((HttpPost) requestBase).setEntity(new UrlEncodedFormEntity(params[0], "UTF-8")); HttpResponse response = client.execute(requestBase); if (response.getStatusLine().getStatusCode() < 400) result = true; else result = false; Log.w("WARN", "Send message to slack result : " + result); } catch (Exception e) { e.printStackTrace(); } return result; } } }