title: How to change a part of layout with a button without using tabHost?
body: <p>The main layout of my program has three sections: top, mid and the bottom. By clicking buttons, I want the only mid-section of the screen change with other two parts remained the same. So it's similar with tab layout but without using tabHost I would like to change mid-section screen by imageview.</p>
  
  <p>I tried to start a new activity contained in a view, but failed. Also tried to load entirely new layout containing all three sections, but also failed due to memory issues.</p>
  
  <p>Thanks for advance!</p>