java - How can I put titles in ViewPager using fragments?

Question

I am using ViewPager to allow user to swipe between fragments.

How can I add a the title of each fragment to the screen?

package com.multi.andres;

import java.util.List;
import java.util.Vector;

import com.viewpagerindicator.TitlePageIndicator;
import com.viewpagerindicator.TitleProvider;

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.view.ViewPager;

public class ViewPagerFragment extends FragmentActivity{

    private PagerAdapter mPagerAdapter; //contiene el pager adapter
    private static String[] titulosPaginas = { "APP 1", "APP 2" };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        super.setContentView(R.layout.lcmeter); //layout que contiene el ViewPager

        initialisePaging(); //inicializo las paginas
    }

    private void initialisePaging() {

        List<Fragment> fragments = new Vector<Fragment>();
        fragments.add(Fragment.instantiate(this, FragmentPrueba1.class.getName()));
        fragments.add(Fragment.instantiate(this, FragmentPrueba2.class.getName()));
        this.mPagerAdapter  = new PagerAdapter(super.getSupportFragmentManager(), fragments);

        ViewPager pager = (ViewPager)super.findViewById(R.id.pager);
        pager.setAdapter(this.mPagerAdapter);

        //Agrega los titulos
        TitlePageIndicator titleIndicator = (TitlePageIndicator) findViewById(R.id.titulos);    //layout XML
        titleIndicator.setViewPager(pager);
    }

    /** *************************************************************************************************
    /** Clase:   public class PagerAdapter extends FragmentPagerAdapter implements TitleProvider
    /** Notas:   extends FragmentPagerAdapter permite el uso de las paginas de ViewPager pero con Fragments
    /**          implements TitleProvider permite el uso de los titulos en las paginas
    /** Funcion: crea paginas por las cuales deslizarse horizontalmente las cuales son usadas
    ****************************************************************************************************/
    public class PagerAdapter extends FragmentPagerAdapter implements TitleProvider {

        private List<Fragment> fragments;

        public String getTitle(int position) {
            // TODO Auto-generated method stub
            return titulosPaginas[position];    // titulo de la pagina
        }

        public PagerAdapter(FragmentManager fm, List<Fragment> fragments) {
            super(fm);
            this.fragments = fragments;
        }

        @Override
        public int getCount() {
            return this.fragments.size();
        }

        @Override
        public Fragment getItem(int position) {
            return this.fragments.get(position);
        }

    }

}

But it doesn't show the titles of ViewPager and I don't know why. I used ViewPager with titles before but not with fragments and I cannot get titles working now.

Answer 1

You can also use Jake Wharton's ViewPagerIndicator library to get the desired effect. Davek804's answer works too, but it requires you to reference the entire ActionBarSherlock library, which isn't as preferable if you only need a ViewPager that supports custom/styled titles.

Setting it up to work correctly is simply a matter of writing a tiny bit of XML, initializing your ViewPager in your Activity, and implementing a FragmentAdapter (which extends FragmentPagerAdapter implements TitleProvider) to specify which pages hold which Fragments.

1. XML layout

   <LinearLayout
       xmlns:android="http://schemas.android.com/apk/res/android"
       android:orientation="vertical"
       android:layout_width="match_parent"
       android:layout_height="match_parent">
   
       <com.viewpagerindicator.TabPageIndicator
           android:id="@+id/titles"
           android:layout_height="wrap_content"
           android:layout_width="match_parent"/>
   
       <android.support.v4.view.ViewPager
           android:id="@+id/pager"
           android:layout_width="match_parent"
           android:layout_height="0dp"
           android:layout_weight="1"/>
   
   </LinearLayout>
   

2. Initialize in your Activity

   //Set the pager with an adapter
   ViewPager pager = (ViewPager)findViewById(R.id.pager);
   pager.setAdapter(new CustomAdapter(getSupportFragmentManager()));
   
   //Bind the title indicator to the adapter
   TitlePageIndicator titleIndicator = (TitlePageIndicator) findViewById(R.id.titles);
   titleIndicator.setViewPager(pager);
   

3. Implement a CustomFragmentAdapter

   public static class CustomFragmentAdapter extends FragmentPagerAdapter 
           implements TitleProvider {
   
           public static final int POSITION_PAGE_1 = 0;
           public static final int POSITION_PAGE_2 = 1;
           public static final int POSITION_PAGE_3 = 2;
   
           private static final String[] TITLES = new String[] { 
               "Title 1", 
               "Title 2", 
               "Title 3" 
           };
   
           public static final int NUM_TITLES = TITLES.length;
   
           public CustomFragmentAdapter(FragmentManager fm) {      
               super(fm);
           }
   
           @Override
           public Fragment getItem(int position) {     
               switch (position) {
               case POSITION_TITLE_1:              
                   return PageOneFragment.newInstance();
               case POSITION_TITLE_2: 
                   return PageTwoFragment.newInstance();
               case POSITION_TITLE_3:
                   return PageThreeFragment.newInstance();         
               }
               return null;
           }
   
           @Override
           public int getCount() {
               return NUM_TITLES;
           }
   
           @Override
           public String getTitle(int position) {
               return TITLES[position % NUM_TITLES].toUpperCase();
           }
       }
   

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Edit:

The ViewPagerIndicator library supports the titling features:

1. TitlePageIndicator

   

2. TabPageIndicator

   

3. CirclePageIndicator