only support system 5.0/latest!!!😭who can solve before 5.0 support!!!

ExpandingPager is a card peek/pop controller

SIZE & FRAGMENT AREA

Setup

Just extends ExpandingViewPagerAdapter in your Fragment Adapter and setup the ExpandingViewPager

ViewPager viewPager;

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

    viewPager.setAdapter( new CustomViewPagerAdapter(getSupportFragmentManager()) );

    ExpandingFactory.setupViewPager(ViewPager viewPager);
}

Adapter

Just extends ExpandingViewPagerAdapter in your Fragment Adapter, which returns ExpandingFragment`

public class CustomViewPagerAdapter extends ExpandingViewPagerAdapter {

    @Override
    public Fragment getItem(int position) {
        return CustomExpandingFragment.newInstance();
    }

}

Your ExpandingFragment must returns a FragmentTop and a FragmentBottom

public class CustomExpandingFragment extends ExpandingFragment {

    @Override
    public Fragment getFragmentFront() {
        return CustomFragmentTop.newInstance();
    }

    @Override
    public Fragment getFragmentBottom() {
        return CustomFragmentBottom.newInstance();
    }
}

Fragments

Top

please do not set full screen click Event,it maybe can prevent the main click Event.

public class CustomFragmentTop extends Fragment  {


}

Bottom

Create your top fragment implementing ExpandingFragment.ChildTop

public class CustomFragmentBottom extends Fragment  {


}

BackPress

@Override
public void onBackPressed() {
    if(!expandingViewPager.onBackPressed(viewPager)){
        super.onBackPressed();
    }
}