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Android Build a Self-Destructing Message Android App Using Fragments for Tabs How Fragments are Used as Tabs

TJ Rogers
TJ Rogers
8,758 Points

Tabs not appearing in Ribbit app - Android Studio.

I'm having trouble getting my Main Activity to render as a 3-tabbed view as it appears in the Tutorial video. All I see is a plan view without any tabs.

The issue, I'm sure, is that I'm using Android Studio and not all the video instructions, which uses Eclipse correspond exactly.

I've followed the teacher's notes and made the changes as instructed, adding the imports, and making a few changes to the default code. But it still does not work. I'll paste my Main Activity code below (although it's long). If someone can explain what I'm doing wrong (or what I left out), I would greatly appreciate it.


import java.util.Locale;

import android.app.Activity;
import android.app.ActionBar;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.app.FragmentTransaction;
import android.content.Intent;
import android.support.v4.app.FragmentPagerAdapter;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
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 android.content.Context;

import com.parse.ParseAnalytics;
import com.parse.ParseUser;

public class MainActivity extends FragmentActivity {

    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.v13.app.FragmentStatePagerAdapter}.
    SectionsPagerAdapter mSectionsPagerAdapter;

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

    protected void onCreate(Bundle savedInstanceState) {


        ParseUser currentUser = ParseUser.getCurrentUser();
        if (currentUser == null) {
        else {
            Log.i(TAG, currentUser.getUsername());

        // Create the adapter that will return a fragment for each of the three
        // primary sections of the activity.
        mSectionsPagerAdapter = new SectionsPagerAdapter(this, getSupportFragmentManager());

        // Set up the ViewPager with the sections adapter.
        mViewPager = (ViewPager) findViewById(R.id.pager);


    private void navigateToLogin() {
        Intent intent = new Intent(this, LoginActivity.class);

    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;

    public boolean onOptionsItemSelected(MenuItem item) {
        int itemId = item.getItemId();
        if (itemId == R.id.action_logout) {
        return super.onOptionsItemSelected(item);

    public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {


    public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {


    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(MainActivity mainActivity, FragmentManager fm) {

        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);

        public int getCount() {
            // Show 3 total pages.
            return 3;

        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 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);
            return fragment;

        public PlaceholderFragment() {

        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.fragment_main, container, false);
            return rootView;


2 Answers

Shariq Shaikh
Shariq Shaikh
13,945 Points

In the version of android studio that I am running, to replicate what Ben is doing in eclipse I configured the project and selected form factors which is done essentially the way Ben does it in eclipse. Here is where the differences arise but the same end result can be reached. In "add an activity to Mobile" I didn't choose blank activity. Instead I choose "Tabbed Activity" which for me was the last activity to choose from the given list. In the next and final set of options I was given the option to adjust my Navigation Style. To match what Ben did in eclipse I selected "Action Bar Tabs (with ViewPager)" and clicked finished. As far I can tell so far the project is identical to one in the video tutorial.

TJ Rogers
TJ Rogers
8,758 Points

great, thanks!