title: android studio cannot find "Activity" symbol
body: <p>I have tried to create and run <code>hello world</code> new app using <code>Android studio.</code>
  however i cannot compile as it says it's cannot resolve <code>Activity</code> symbol.</p>
  
  <p>and also other basic symbols in the black template.</p>
  
  <p>I suggest adding/configuration the JDK.</p>
  
  <p>I guess I'm doing this wrong, because I have tried to add the <code>JDK</code> and the problem re-occurred.</p>
  
  <p><img src="https://i.stack.imgur.com/2qgD6.png" alt="enter image description here"></p>
  
  <p>how to solve this?</p>
  
  <p><strong>UPDATE1</strong></p>
  
  <p>couldn't find external build</p>
  
  <p><img src="https://i.stack.imgur.com/cUsVQ.png" alt="enter image description here"></p>
  
  <p><img src="https://i.stack.imgur.com/2R2ub.png" alt="enter image description here"></p>
  
  <p>Android studio 0.2.6</p>