title: How to import android native apps in Android studio?
body: <p>I want to import a native app, such as dialer or mms.</p>
  
  <p>but always failed to build. some resource like color etc. not found
  and some class , such as NoNullCursorAsyncQueryHandler, also not resolved.</p>
  
  <p>my step is :
  1. start Android studio 
  2. File->import project
  3. select the source folder
  4. clean &amp; build.</p>
  
  <p>the correct steps ?</p>
  
  <p>Thanks.</p>