title: addOnPageChangeListener is undefined
body: <p>I have downloaded a code from Github.I can not run the program.The problem is the method <strong>addOnPageChangeListener</strong> is undefined.Here's the error:</p>
  
  <blockquote>
    <p>The method addOnPageChangeListener(TabLayout.TabLayoutOnPageChangeListener) is undefined for the type ViewPager</p>
  </blockquote>
  
  <p>What should i do? Should I use another method? Here's the code:</p>
  
  <pre><code>import android.support.design.widget.CollapsingToolbarLayout;
  import android.support.design.widget.CoordinatorLayout;
  import android.support.design.widget.FloatingActionButton;
  import android.support.design.widget.Snackbar;
  import android.support.design.widget.TabLayout;
  import android.support.v4.app.Fragment;
  import android.support.v4.app.FragmentManager;
  import android.support.v4.app.FragmentStatePagerAdapter;
  import android.support.v4.view.ViewPager;
  import android.support.v4.widget.DrawerLayout;
  import android.support.v7.app.ActionBarDrawerToggle;
  import android.support.v7.app.AppCompatActivity;
  
  import java.util.ArrayList;
  
  
  public class FourthActivity extends AppCompatActivity {
  
  // Need this to link with the Snackbar
  private CoordinatorLayout mCoordinator;
  //Need this to set the title of the app bar
  private CollapsingToolbarLayout mCollapsingToolbarLayout;
  private FloatingActionButton mFab;
  private Toolbar mToolbar;
  private DrawerLayout mDrawerLayout;
  private ActionBarDrawerToggle mDrawerToggle;
  private ViewPager mPager;
  private YourPagerAdapter mAdapter;
  private TabLayout mTabLayout;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_fourth);
      mCoordinator = (CoordinatorLayout) findViewById(R.id.root_coordinator);
  
      mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, mToolbar, R.string.drawer_open, R.string.drawer_close);
      mDrawerLayout.setDrawerListener(mDrawerToggle);
      mDrawerToggle.syncState();
  
      mTabLayout = (TabLayout) findViewById(R.id.tab_layout);
      mAdapter = new YourPagerAdapter(getSupportFragmentManager());
      mPager = (ViewPager) findViewById(R.id.view_pager);
      mPager.setAdapter(mAdapter);
      //Notice how the Tab Layout links with the Pager Adapter
      mTabLayout.setTabsFromPagerAdapter(mAdapter);
  
      //Notice how The Tab Layout adn View Pager object are linked
      mTabLayout.setupWithViewPager(mPager);
      mPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(mTabLayout));
  
  
      mFab.setOnClickListener(new View.OnClickListener() {
          @Override
          public void onClick(View v) {
              //Notice how the Coordinator Layout object is used here
              Snackbar.make(mCoordinator, "FAB Clicked", Snackbar.LENGTH_SHORT).setAction("DISMISS", null).show();
          }
      });
  
      //Notice how the title is set on the Collapsing Toolbar Layout instead of the Toolbar
      mCollapsingToolbarLayout.setTitle(getResources().getString(R.string.title_activity_fourth));
  }
  </code></pre>