cant see any text or list in my inbox fragment or in friends fragment, i can only see section names inbox and friends

this is my MainActiviy.java

package com.ahmetyuva.ribbit;

import java.util.Locale;

import android.support.v7.app.ActionBarActivity; import android.support.v7.app.ActionBar; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentTransaction; import android.support.v4.app.FragmentPagerAdapter; import android.os.Bundle; 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.TextView; import java.util.Locale;

import android.content.Intent; import android.support.v7.app.ActionBarActivity; import android.support.v7.app.ActionBar; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentTransaction; import android.support.v4.app.FragmentPagerAdapter; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentPagerAdapter; import android.content.Context;

import android.os.Bundle; import android.support.v4.view.ViewPager; import android.util.Log; 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.TextView;

import com.parse.Parse; import com.parse.ParseAnalytics; import com.parse.ParseException; import com.parse.ParseObject; import com.parse.ParseUser; import com.parse.SignUpCallback;

public class MainActivity extends ActionBarActivity implements ActionBar.TabListener {

public static final String TAG = MainActivity.class.getSimpleName();

/**

• 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}. */ SectionsPagerAdapter mSectionsPagerAdapter;

/**

• The {@link ViewPager} that will host the section contents. */ ViewPager mViewPager;

@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

ParseUser currentUser = ParseUser.getCurrentUser();
if(currentUser == null) {

    navigateToLogin();
}
else{
    Log.i(TAG, currentUser.getUsername());
}

// Set up the action bar.
final ActionBar actionBar = getSupportActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

// 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.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);

// When swiping between different sections, select the corresponding
// tab. We can also use ActionBar.Tab#select() to do this if we have
// a reference to the Tab.
mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
    @Override
    public void onPageSelected(int position) {
        actionBar.setSelectedNavigationItem(position);
    }
});



// For each of the sections in the app, add a tab to the action bar.
for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) {
    // Create a tab with text corresponding to the page title defined by
    // the adapter. Also specify this Activity object, which implements
    // the TabListener interface, as the callback (listener) for when
    // this tab is selected.
    actionBar.addTab(
            actionBar.newTab()
                    .setText(mSectionsPagerAdapter.getPageTitle(i))
                    .setTabListener(this));
}

}

private void navigateToLogin() { Intent intent = new Intent(this, LoginActivity.class); intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK); startActivity(intent); }

@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_main, 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_logout) {
    ParseUser.logOut();
    navigateToLogin();

}

return super.onOptionsItemSelected(item);

}

@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 PlaceholderFragment (defined as a static inner class below). return PlaceholderFragment.newInstance(position + 1); }

  @Override public int getCount() { // Show 3 total pages. return 2; }

  @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); } return null; } }

/**

• 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";

  /**

  • 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; }

  public PlaceholderFragment() { }

} }

this is InboxFragment.java

package com.ahmetyuva.ribbit;

import android.os.Bundle; import android.support.v4.app.ListFragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup;

/** * Created by ahmetyuva on 06/04/15. */ public class InboxFragment extends ListFragment { @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_inbox, container, false);

return rootView;

} }

and this is SectionsPagerAdapter.java

package com.ahmetyuva.ribbit;

/** * Created by ahmetyuva on 06/04/15. */

import android.content.Context; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentPagerAdapter;

import java.util.Locale;

/** * A {@link android.support.v4.app.FragmentPagerAdapter} that returns a fragment corresponding to * one of the sections/tabs/pages. */ public class SectionsPagerAdapter extends FragmentPagerAdapter {

protected Context mContext;

public SectionsPagerAdapter(Context context, FragmentManager fm) { super(fm); mContext = context; }

@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:
        return new InboxFragment();
    case 1:
        return new FriendsFragment();
}

return null;

}

@Override public int getCount() {

return 2;

}

@Override public CharSequence getPageTitle(int position) { Locale l = Locale.getDefault(); switch (position) { case 0: return mContext.getString(R.string.title_section1).toUpperCase(l); case 1: return mContext.getString(R.string.title_section2).toUpperCase(l);

}
return null;

} }