Dynamic FragmentStatePagerAdapter

Here is an example of how to make a PagerAdapter that can add and remove fragments dynamically.

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.view.PagerAdapter;


import java.lang.ref.WeakReference;
import java.util.ArrayList;


public class DynamicPagerAdapter extends FragmentStatePagerAdapter{

    private ArrayList<WeakReference<Fragment>> registeredFragments = new ArrayList<WeakReference<Fragment>>();

    public TouchPagerAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int position) {
        WeakReference<Fragment> weakReference = registeredFragments.get(position);
        return weakReference.get();
    }


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


    @Override
    public int getItemPosition(Object object){
        return PagerAdapter.POSITION_NONE;
    }

    public void add(Fragment f){
        registeredFragments.add(new WeakReference<Fragment>(f));
        notifyDataSetChanged();
    }

    public void remove(int position){
        registeredFragments.remove(position);
        notifyDataSetChanged();
    }
}












Example :






 pagerAdapter = new DinamicPagerAdapter(getSupportFragmentManager());

        viewPager = (ViewPager) findViewById(R.id.viewpager);

        viewPager.setAdapter(pagerAdapter);

        pagerAdapter.add(TouchMapFragment.newInstance());

        pagerAdapter.add(GridFragment.newInstance());

        pagerAdapter.remove(0);

        pagerAdapter.add(TouchMapFragment.newInstance());

        pagerAdapter.remove(0);

        pagerAdapter.add(GridFragment.newInstance());

 pagerAdapter = new DinamicPagerAdapter(getSupportFragmentManager());
        viewPager = (ViewPager) findViewById(R.id.viewpager);
        viewPager.setAdapter(pagerAdapter);
        pagerAdapter.add(TouchMapFragment.newInstance());
        pagerAdapter.add(GridFragment.newInstance());
        pagerAdapter.remove(0);
        pagerAdapter.add(TouchMapFragment.newInstance());
        pagerAdapter.remove(0);
        pagerAdapter.add(GridFragment.newInstance());