title: Android tabHost accessing specific tabs
body: <p>I have a tabHost with tree tabs. How can I access a specific tab from the tabHost activity when this tab is not active at the moment.
  And a second question to this topic... How can I access the activity of a tab from another tab?</p>
  
  <p>I need this, because I have to update the second tab when something changes on the first tab.</p>
  
  <p>Thank you</p>