title: Fragment add or replace not working
body: <p>I'm using the code from this <a href="http://developer.android.com/guide/components/fragments.html" rel="noreferrer">reference.</a></p>
  
  <p>When I put in that code in my program I get an error as seen in the picture below.
  <img src="https://i.stack.imgur.com/RpgnS.png" alt="enter image description here"></p>
  
  <p>Any reasons for the error?
  <code>The method replace(int, Fragment) in the type FragmentTransaction is not applicable for the arguments (int, ExampleFragments)</code></p>
  
  <p>Code from my main activity:</p>
  
  <pre><code>public void red(View view) {
          android.app.FragmentManager fragmentManager = getFragmentManager();
                  android.app.FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
          ExampleFragments fragment = new ExampleFragments();
          fragmentTransaction.replace(R.id.frag, fragment);
          fragmentTransaction.commit();
      }
  </code></pre>
  
  <p>ExampleFragments.java</p>
  
  <pre><code>package com.example.learn.fragments;
  
  import android.os.Bundle;
  import android.support.v4.app.Fragment;
  import android.view.LayoutInflater;
  import android.view.View;
  import android.view.ViewGroup;
  
  public class ExampleFragments extends Fragment {
      @Override
      public View onCreateView(LayoutInflater inflater, ViewGroup container,
                               Bundle savedInstanceState) {
          // Inflate the layout for this fragment
          return inflater.inflate(R.layout.blue_pill_frag, container, false);
      }
  }
  </code></pre>
  
  <p>Here:</p>
  
  <pre><code>package com.example.learn.fragments;
  
  import android.app.Activity;
  import android.os.Bundle;
  import android.support.v4.app.Fragment;
  import android.support.v4.app.FragmentManager;
  import android.support.v4.app.FragmentTransaction;
  import android.view.LayoutInflater;
  import android.view.Menu;
  import android.view.View;
  import android.view.ViewGroup;
  </code></pre>