title: Android: are there any native/default animations available in android recource?
body: <p>I'm still a starter in Android. And i just wanna set the <code>fade_in</code> <code>fade_out</code> animations with my Fragments.</p>
  
  <p>and i read the <a href="http://developer.android.com/reference/android/R.animator.html" rel="nofollow">android document</a>, which shows that the <code>R.animator.fade_in</code> is available.</p>
  
  <p>but in my Android Studio, when i typed in <code>R.animator</code>, it alerts that "cant resolve animator".</p>
  
  <p>are there any native/default animations available in android recource?</p>