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private SectionsPagerAdapter mSectionsPagerAdapter;
 
  /**
   * The {@link ViewPager} that will host the section contents.
   */
  private ViewPager mViewPager;
 
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_tab);
 
      Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
      setSupportActionBar(toolbar);
      // Create the adapter that will return a fragment for each of the three
      // primary sections of the activity.
      mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
 
      // Set up the ViewPager with the sections adapter.
      mViewPager = (ViewPager) findViewById(R.id.container);
      mViewPager.setAdapter(mSectionsPagerAdapter);
 
      TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
      tabLayout.setupWithViewPager(mViewPager);
 
      FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
      fab.setOnClickListener(new View.OnClickListener() {
          @Override
          public void onClick(View view) {
              Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                      .setAction("Action", null).show();
          }
      });
 
  }
 
 
  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
      // Inflate the menu; this adds items to the action bar if it is present.
      getMenuInflater().inflate(R.menu.menu_tab, menu);
      return true;
  }
 
  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
      // Handle action bar item clicks here. The action bar will
      // automatically handle clicks on the Home/Up button, so long
      // as you specify a parent activity in AndroidManifest.xml.
      int id = item.getItemId();
 
      //noinspection SimplifiableIfStatement
      if (id == R.id.action_settings) {
          return true;
      }
 
      return super.onOptionsItemSelected(item);
  }
 
  /**
   * A placeholder fragment containing a simple view.
   */
  public static class PlaceholderFragment extends Fragment {
      /**
       * The fragment argument representing the section number for this
       * fragment.
       */
      private static final String ARG_SECTION_NUMBER = "section_number";
 
      public PlaceholderFragment() {
      }
 
      /**
       * Returns a new instance of this fragment for the given section
       * number.
       */
      public static PlaceholderFragment newInstance(int sectionNumber) {
          PlaceholderFragment fragment = new PlaceholderFragment();
          Bundle args = new Bundle();
          args.putInt(ARG_SECTION_NUMBER, sectionNumber);
          fragment.setArguments(args);
          return fragment;
      }
 
      @Override
      public View onCreateView(LayoutInflater inflater, ViewGroup container,
                               Bundle savedInstanceState) {
          View rootView = inflater.inflate(R.layout.fragment_tab, container, false);
          TextView textView = (TextView) rootView.findViewById(R.id.section_label);
          textView.setText(getString(R.string.section_format, getArguments().getInt(ARG_SECTION_NUMBER)));
          return rootView;
      }
  }
 
  /**
   * A {@link FragmentPagerAdapter} that returns a fragment corresponding to
   * one of the sections/tabs/pages.
   */
  public class SectionsPagerAdapter extends FragmentPagerAdapter {
 
      public SectionsPagerAdapter(FragmentManager fm) {
          super(fm);
      }
 
      @Override
      public Fragment getItem(int position) {
          // getItem is called to instantiate the fragment for the given page.
          // Return a PlaceholderFragment (defined as a static inner class below).
          return PlaceholderFragment.newInstance(position + 1);
      }
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