content: package anna.takeapill;
  
  import android.support.design.widget.TabLayout;
  import android.support.design.widget.FloatingActionButton;
  import android.support.design.widget.Snackbar;
  import android.support.v7.app.AppCompatActivity;
  import android.support.v7.widget.Toolbar;
  
  import android.support.v4.app.Fragment;
  import android.support.v4.app.FragmentManager;
  import android.support.v4.app.FragmentPagerAdapter;
  import android.support.v4.view.ViewPager;
  import android.os.Bundle;
  import android.util.Log;
  import android.view.LayoutInflater;
  import android.view.Menu;
  import android.view.MenuItem;
  import android.view.View;
  import android.view.ViewGroup;
  
  import android.widget.TextView;
  
  public class MainActivity extends AppCompatActivity {
  
      /**
       * The {@link android.support.v4.view.PagerAdapter} that will provide
       * fragments for each of the sections. We use a
       * {@link FragmentPagerAdapter} derivative, which will keep every
       * loaded fragment in memory. If this becomes too memory intensive, it
       * may be best to switch to a
       * {@link android.support.v4.app.FragmentStatePagerAdapter}.
       */
      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_main);
  
          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);
  
      }
  
      /**
       * 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();
              //Tab_1 fragment = new Tab_1();
              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_main, container, false);
              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).
  
              switch(position) {
                  case 0:
                      Tab_1 tab1 = new Tab_1();
                      return tab1;
                  case 1:
                      Tab_2 tab2 = new Tab_2();
                      return tab2;
                  case 2:
                      Tab_3 tab3 = new Tab_3();
                      return tab3;
                  default:
                      return PlaceholderFragment.newInstance(position + 1);
              }
  
              //return PlaceholderFragment.newInstance(position + 1);
          }
  
          @Override
          public int getCount() {
              // Show 3 total pages.
              return 3;
          }
  
          @Override
          public CharSequence getPageTitle(int position) {
              switch (position) {
                  case 0:
                      return "Take pill";
                  case 1:
                      return "History";
                  case 2:
                      return "Analyze";
              }
              return null;
          }
      }
  }
  