title: Calling Custom ListView Adapter from Fragment Class Main Activity
body: <p>I've written a few listView activities, as a proof of concept for myself that I could do it.  Now, I'm having trouble loading a listView activity into a single tab for an app with multiple tabs, that allows both swiping and tab selection for navigation.  I get the error "The constructor ListView_Adapter(MainActivity.DummySectionFragment) is undefined" when I try to write the code for it.  I'm a beginner, and I've lurked pretty hard here for the past few days.  Any help is appreciated.</p>
  
  <p>TL;DR : I'm a n00b, and I can't figure out this problem.</p>
  
  <p>My Custom List Adapter</p>
  
  <pre><code>    import android.content.Context;
      import android.view.LayoutInflater;
      import android.view.View;
      import android.view.ViewGroup;
      import android.widget.ArrayAdapter;
      import android.widget.TextView;
  
      public class CustomListViewAdapter extends ArrayAdapter&lt;String&gt; {
  
          public CustomListViewAdapter (Context c) {
              super(c, R.layout.list_cell);
          }
  
          @Override
          public View getView(int position, View convertView, ViewGroup parent) {
              View row = convertView;
              ListView_Text holder = null;
  
              if (row == null)
              {
                  LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
  
                  row = inflater.inflate(R.layout.list_cell, parent, false);
                  holder = new ListView_Text(row);
                  row.setTag(holder);
              }
              else
              {
                  holder = (ListView_Text) row.getTag();
              }
  
              holder.populateFrom(getItem(position));
  
              return row;
          }
  
          static class ListView_Text {
              private TextView cell_name = null;
  
              ListView_Text(View row) {
                  cell_name = (TextView) row.findViewById(R.id.list_cell_name);
              }
  
              void populateFrom(String index) {
                  cell_name.setText(index);
              }
  
          }
      }
  </code></pre>
  
  <p>My Main Activity</p>
  
  <pre><code>    import java.util.Locale;
  
      import android.app.ActionBar;
      import android.app.ActionBar.Tab;
      import android.app.FragmentTransaction;
      import com.example.twigglebeta2.ListView_Adapter;
      import android.os.Bundle;
      import android.support.v4.app.Fragment;
      import android.support.v4.app.FragmentActivity;
      import android.support.v4.app.FragmentManager;
      import android.support.v4.app.FragmentPagerAdapter;
      import android.support.v4.app.NavUtils;
      import android.support.v4.view.ViewPager;
      import android.view.Gravity;
      import android.view.LayoutInflater;
      import android.view.Menu;
      import android.view.MenuItem;
      import android.view.View;
      import android.view.ViewGroup;
      import android.widget.ListView;
      import android.widget.TextView;
  
      public class MainActivity extends FragmentActivity implements ActionBar.TabListener {
          private static ListView_Adapter listViewAdapter;
          private ListView listView;
  
          SectionsPagerAdapter mSectionsPagerAdapter;
  
          ViewPager mViewPager;
  
          @Override
          protected void onCreate(Bundle savedInstanceState) {
              super.onCreate(savedInstanceState);
              setContentView(R.layout.activity_main);
  
              // Set up the action bar.
              final ActionBar actionBar = getActionBar();
              actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
  
              // Create adapter
              mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
              // Set up the ViewPager with the sections adapter.
              mViewPager = (ViewPager) findViewById(R.id.pager);
              mViewPager.setAdapter(mSectionsPagerAdapter);
  
              // Switch tab selection to match current page when swiped
              mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
                          @Override
                          public void onPageSelected(int position) {
                              actionBar.setSelectedNavigationItem(position);
                          }
                      });
  
              // Create a tab for each 'count' in the activity from getCount()
              for (int i = 0; i &lt; mSectionsPagerAdapter.getCount(); i++) {
                  Tab thisTab = actionBar.newTab();
                  thisTab.setText(mSectionsPagerAdapter.getPageTitle(i));
                  thisTab.setTabListener(this);
                  actionBar.addTab(thisTab);
              }
          }
  
          @Override
          public boolean onCreateOptionsMenu(Menu menu) {
              // Inflate the menu; this adds items to the action bar if it is present.
              getMenuInflater().inflate(R.menu.main, menu);
              return true;
          }
  
          @Override
          public void onTabSelected(ActionBar.Tab tab,FragmentTransaction fragmentTransaction) {
              // When the given tab is selected, switch to the corresponding page in
              // the ViewPager.
              mViewPager.setCurrentItem(tab.getPosition());
          }
  
          @Override
          public void onTabUnselected(ActionBar.Tab tab,FragmentTransaction fragmentTransaction) {
          }
  
          @Override
          public void onTabReselected(ActionBar.Tab tab,FragmentTransaction fragmentTransaction) {
          }
  
          /**
           * 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 DummySectionFragment (defined as a static inner class
                  // below) with the page number as its lone argument.
                  Fragment fragment = new DummySectionFragment();
                  Bundle args = new Bundle();
                  args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, position + 1);
                  fragment.setArguments(args);
                  return fragment;
              }
  
              @Override
              public int getCount() {
                  // Show 3 total pages.
                  return 3;
              }
  
              @Override
              public CharSequence getPageTitle(int position) {
                  Locale l = Locale.getDefault();
                  switch (position) {
                  case 0:
                      return getString(R.string.title_section1).toUpperCase(l);
                  case 1:
                      return getString(R.string.title_section2).toUpperCase(l);
                  case 2:
                      return getString(R.string.title_section3).toUpperCase(l);
                  }
                  return null;
              }
          }
  
          /**
           * A dummy fragment representing a section of the app, but that simply
           * displays dummy text.
           */
          public static class DummySectionFragment extends Fragment {
              /**
               * The fragment argument representing the section number for this
               * fragment.
               */
              public static final String ARG_SECTION_NUMBER = "section_number";
  
              public DummySectionFragment() {
              }
  
              @Override
              public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
                  View rootView = inflater.inflate(R.layout.fragment_main_dummy,container, false);
                  switch(getArguments().getInt(ARG_SECTION_NUMBER)){
                  case 1:
                      //The constructor ListView_Adapter(MainActivity.DummySectionFragment) is undefined
                      listViewAdapter = new ListView_Adapter(this);
                      ListView listView = (ListView) rootView.findViewById(R.id.listView1);
                      for (int i=0;i&lt;20;i++)
                      {
                          listViewAdapter.add("this Index : "+i);
                      }
                      return listView;
                  }
                  TextView dummyTextView = (TextView) rootView.findViewById(R.id.section_label);
                  dummyTextView.setText(Integer.toString(getArguments().getInt(ARG_SECTION_NUMBER)));
                  return rootView;
              }
          }
  
      }
  </code></pre>