title: moveTaskToBack(true) returns false always
body: <p>I know this has been asked earlier <a href="https://stackoverflow.com/questions/11495188/how-to-put-application-to-background" title="here">here</a> &amp; <a href="https://stackoverflow.com/questions/5312334/how-to-handle-back-button-in-activity/5312426#5312426">here too</a>.They are not answered properly (or not answered at all).But,i don't know why <code>moveTaskToBack(true);</code> always returns false for me .Can anyone tell me why and how could i solve the issue? Thanks in advance.</p>
  
  <pre><code>public void onBackPressed() {       
      boolean r=  moveTaskToBack(true);
      //r is false !! using API LEVEL 8
  }
  </code></pre>
  
  <p>Note:The activity from which i am calling it is a child <code>Activity</code> included in a <code>tabActivity</code> and neither of this is a <strong>MAIN</strong> or <strong>LAUNCHER</strong> activity.I don't know if that makes a difference.</p>
  
  <p><strong>EDIT:</strong>
  and as a result the application does'nt go to background.I want it to go to background just as if the hardware HOME is pressed</p>