Change viewpager fragment by a buttonClick

Question

I'm trying to change the viewpager fragment by clicking on a button. I have 5 fragments, each fragment has it's own xml file (frag1.xml, frag2.xml, and so on). Every fragment has it's 5 buttons that should go to other pages of the viewpager. But the problem is how do I check in the FragmentPageAdapter which button is clicked and how to get there?

I'll show the code I have then it should be clear I think. Think of it like a homescreen that has dots at the bottom and I you click a certain dot, you'll go to the corresponding screen.

FragmentPagerAdapter

public class MyFragmentPagerAdapter extends FragmentPagerAdapter{

    final int PAGE_COUNT = 6;

    /** Constructor of the class */
    public MyFragmentPagerAdapter(FragmentManager fm) {
        super(fm);
    }

    /** This method will be invoked when a page is requested to create */
    @Override
    public Fragment getItem(int arg0) {

        switch(arg0){

        case 0:

            return new Fragment1();

        case 1:
            return new Fragment2();

        case 2:
            return new Fragment3();

        case 3:
            return new Fragment4();

        case 4:
            return new Fragment5();

        default:
            return null;

        }       
    }

    /** Returns the number of pages */
    @Override
    public int getCount() {
        return PAGE_COUNT;
    }
}

Frag1.java

public class Frag1 extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.frag_one, container, false);


        OnClickListener changeFrag = new OnClickListener() {            
            @Override
            public void onClick(View v) {
            /*When I click this button in my fragment, I'd like it to go to fragment 3 for example*/
            }
        };

        ImageButton btnT = (ImageButton) v.findViewById(R.id.frag3);
        btnT.setOnClickListener(changeFrag);

        return v;
    }
}

MainActivity

public class MainActivity extends FragmentActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);/** Getting a reference to the ViewPager defined the layout file */
        ViewPager pager = (ViewPager) findViewById(R.id.pager);

        /** Getting fragment manager */
        FragmentManager fm = getSupportFragmentManager();

        /** Instantiating FragmentPagerAdapter */
        MyFragmentPagerAdapter pagerAdapter = new MyFragmentPagerAdapter(fm);

        /** Setting the pagerAdapter to the pager object */
        pager.setAdapter(pagerAdapter);

       //pager.setPageTransformer(true, new ZoomOutPageTransformer());
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
}

Is something like this possible? Can someone help me in the right direction please?

Answer 1

I'm not sure what exactly you said about "Change".

If you're asking about change page display index, you can try

ViewPager.setCurrentItem(int pageIndex, boolean isSmoothScroll);

Or, if you're asking about change content, here's what I did

public class MyPagerAdapter extends FragmentStatePagerAdapter
{
  private FragmentManager fragMan;
  private ArrayList<Fragment> fragments=new ArrayList<Fragment>();

  public void clearAll() //You can clear any specified page if you want...
  {
    for(int i=0; i<fragments.size(); i++)
    fragMan.beginTransaction().remove(fragments.get(i)).commit();
    fragments.clear();
    fragments=new ArrayList<Fragment>();
    notifyDataSetChanged();
  }

  public void addList() //Add some new fragment...
  {
    listFrag=new ListFragment();
    fragments.add(list);
  }
}

Hope it helps~