Implementation of PagerAdapter that uses the children of a ViewPager as pages.

AutoPagerAdaptor.java

import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.view.ViewGroup;

/**
 * Implementation of PagerAdapter that uses
 * the children of a ViewPager as pages.
 */
public class AutoPagerAdaptor extends PagerAdapter {

    private final ViewPager viewPager;

    private AutoPagerAdaptor(ViewPager viewpager) {
        this.viewPager = viewpager;
    }

    public Object instantiateItem(ViewGroup collection, int position) {
        return viewPager.getChildAt(position);
    }

    @Override
    public int getCount() {
        return viewPager.getChildCount();
    }

    @Override
    public boolean isViewFromObject(View view, Object object) {
        return view == object;
    }

    public static AutoPagerAdaptor setAutoPagerAdapterTo(ViewPager viewPager) {
        AutoPagerAdaptor autoPagerAdaptor = new AutoPagerAdaptor(viewPager);
        viewPager.setAdapter(autoPagerAdaptor);
        return autoPagerAdaptor;
    }
}