Viewpager/Fragment Tabs Adapter

While working with Viewpager which contains multiple Tabs and each tab is a fragment, it is necessary to have an adapter which decides which fragment should be called when user taps on a specific viewpager tab. For this you have to specify a list of fragments which is passed to adapter then this adapter is set to the viewpager. Here is the method to add and returns an ArrayList of type Fragment.

    
    public ArrayList<Fragment> defaultFragmentList(){

         

        ArrayList<Fragment> fragmentsList = new ArrayList<Fragment>();

         

        fragmentsList.add(new FirstFragment());

        fragmentsList.add(new SecondFragment());

        fragmentsList.add(new ThirdFragment());

         

        return fragmentsList;

    }

After having an arraylist of fragments type we have to pass this list to tabs adapter. Here is the method which takes the fragments arraylist and pass it to adapter.This adapter is set to the viewpager as below:



    public void populateFragments(ArrayList<Fragment> fragmentsList){

         

        mAdapter = new TabsPagerAdapter(this, getSupportFragmentManager(), fragmentsList);   

        viewPager.setAdapter(mAdapter);       

    }

In the onCreate method of the main activity, we call the above methods as:

populateFragments(defaultFragmentList());

Now, here is the complete code of TabsPagerAdapter class. 

import java.util.ArrayList;

import android.content.Context;

import android.support.v4.app.Fragment;

import android.support.v4.app.FragmentManager;

import android.support.v4.app.FragmentPagerAdapter;

public class TabsPagerAdapter extends FragmentPagerAdapter {

    final int TABs=3;

    Context context;

    FragmentManager mFragmentManager;

    ArrayList<Fragment> mFragmentsList;

    public TabsPagerAdapter(Context mContext, FragmentManager fm, ArrayList<Fragment> fragmentsList) {

        super(fm);

        
        context=mContext; 

        mFragmentsList = fragmentsList;     

        mFragmentManager=fm;

    }

    @Override

    public Fragment getItem(int index) {

    

         Fragment fragment =null;                   

         switch (index) {         

         case 0:

             // FirstFragment

             fragment = mFragmentsList.get(0);

             break;

         case 1:   

             // SecondFragment

             fragment = mFragmentsList.get(1);

              break;

         case 2:

             // ThirdFragment

             fragment = mFragmentsList.get(2);

              break;

         }       

         return fragment;                        

    }       

    @Override

    public int getCount() {

         

        // get item count - equal to number of tabs

        return TABs;

    } 

This is one of the simple code.
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