Aufrufen von Benutzerdefinierten ListView-Adapter von Fragment-Klasse Haupttätigkeit

Habe ich geschrieben ein paar listView-Aktivitäten, wie ein proof of concept für mich, dass ich es tun könnte. Nun, ich habe Probleme beim laden eines listView-Aktivität in einer Registerkarte für eine app mit mehreren Registerkarten, die erlaubt, dass beide Wischer und tab-Auswahl für die navigation. Ich bekomme die Fehlermeldung "Der Konstruktor ListView_Adapter(MainActivity.DummySectionFragment) ist nicht definiert", wenn ich versuche, den code zu schreiben für Sie. Ich bin ein Anfänger, und ich habe lauerte ziemlich schwer hier für die letzten paar Tage. Jede Hilfe ist willkommen.

TL;DR : ich bin ein n00b, und ich kann nicht herausfinden, das problem.

Meine Benutzerdefinierte Liste-Adapter

    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<String> {

        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);
            }

        }
    }

Meine Haupttätigkeit

    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 < 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<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;
            }
        }

    }