title: Constraint Layout instead of Relative Layout
body: <p>In new <a href="http://android-developers.blogspot.com/2016/09/android-studio-2-2.html" rel="noreferrer">Android Studio 2.2</a> the Constraint Layout is introduced, I had searched and read about this new layout <a href="https://developer.android.com/training/constraint-layout/index.html?utm_campaign=android%20studio_launch_2.2_091916&amp;utm_source=anddev&amp;utm_medium=blog" rel="noreferrer">here</a> and <a href="https://codelabs.developers.google.com/codelabs/constraint-layout/index.html?index=..%2F..%2F#0" rel="noreferrer">here</a>. and in <a href="https://stackoverflow.com/a/37324703/6643219">this link</a> I had read about differences between Constraint and Relative layouts, but still some questions remain:</p>
  
  <ol>
  <li>Can we replace <code>RelativeLayout</code> with <code>ConstraintLayout</code> completly, as mentioned <a href="https://stackoverflow.com/questions/37349058/when-to-use-constraint-layout-how-to-use-it-efficiently#comment62251679_37351469">here</a>?</li>
  <li>Do devices with old versions can support <code>ConstraintLayout</code>?</li>
  <li>For designing apps with <code>ConstraintLayout</code> we have to update to Android Studio 2.2?</li>
  <li>with using <code>ConstraintLayout</code> we don't need to write many dimens.xml for all screen resolution to have a responsive app? </li>
  </ol>