##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(); } }