PagerSlidingTabStrip implement guide

I am trying to use this library in my app:https://github.com/astuetz/PagerSlidingTabStrip

I read the documents but I didn't understand anything.I have two fragments so I want to place two tabs to my app.Where do I put the viewpager xml ?

Where do I put the this code block:

// Initialize the ViewPager and set an adapter
 ViewPager pager = (ViewPager) findViewById(R.id.pager);
 pager.setAdapter(new TestAdapter(getSupportFragmentManager()));

 // Bind the tabs to the ViewPager
 PagerSlidingTabStrip tabs = (PagerSlidingTabStrip) findViewById(R.id.tabs);
 tabs.setViewPager(pager); 

Just main activity or all fragments and main activity ? (I have same question for viewpager xml) Can anyone explain to me how can I implement this to my app step by step ?

Ps:https://github.com/astuetz/PagerSlidingTabStrip/tree/master/sample This is the example code.

step by step

I just make it for two tabs as you asked!

0) Add the library to your build path

1) Create your two fragments

public class FragmentA extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_a,container,false);
    }
}

and

public class FragmentB extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_b,container,false);
    }
}

and their layouts for example can be:

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent" android:layout_height="match_parent"
    android:background="#FFFF00">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="This is Fragment A"
        android:id="@+id/textView"
        android:gravity="center"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentBottom="true" />
</RelativeLayout>

2) Create MainActivity layout:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <com.astuetz.PagerSlidingTabStrip
        android:id="@+id/tabs"
        android:layout_width="match_parent"
        android:layout_height="48dip"
        />

    <android.support.v4.view.ViewPager
        android:id="@+id/pager"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/tabs"
        tools:context=".MainActivity" />

</RelativeLayout>

3) Create your viewpager adapter

public class MyPagerAdapter extends FragmentPagerAdapter {

    public MyPagerAdapter(FragmentManager fm) {
        super(fm);
    }
    @Override
    public CharSequence getPageTitle(int position) {
        return (position == 0)? "Tab 1" : "Tab2" ;
    }
    @Override
    public int getCount() {
       return 2;
    }
   @Override
   public Fragment getItem(int position) {
      return (position == 0)? new FragmentA() : new FragmentB() ;
   }
}

3) Assign adapter to your viewpager and the viewpager to the PagerSlidingTabStrip at the MainActivity

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

         ViewPager pager = (ViewPager) findViewById(R.id.pager);
         pager.setAdapter(new MyAdapter(getSupportFragmentManager()));

         // Bind the tabs to the ViewPager
         PagerSlidingTabStrip tabs = (PagerSlidingTabStrip) findViewById(R.id.tabs);
         tabs.setViewPager(pager); 
    }

4) Run