title: onStartListening when is it called?
body: <p>I'm working on an android application which is basically a service to convert speech in to text as a background process, I'm getting help from <a href="https://stackoverflow.com/questions/9997720/how-to-register-a-custom-speech-recognition-service">How to register a custom speech recognition service?</a> but I'm unable to know when <code>onStartListening()</code> is called.</p>
  
  <p>Signature:</p>
  
  <pre><code>protected void onStartListening(Intent recognizerIntent, Callback listener)
  </code></pre>
  
  <p>Can any one can help or help me add more statements in the code given in that link so that I can recognize the speech in to text and show it in the toast?</p>