Как предотвратить Recyclerview expand в CoordinatorLayout

Question

Я хочу создать заголовок parallax с координатором. Я поместил recyclerview в Coordinatorlayout. Оно работает. Но recyclerview загружает все данные, но я делю свой список данных на страницы. Каждый прокручиваемый последний элемент, я хочу загрузить следующую страницу. Но он загружает все данные в начале.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?> 
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:fitsSystemWindows="true"> 

     <android.support.design.widget.AppBarLayout 
      android:id="@+id/appbar" 

      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:fitsSystemWindows="true" 
      android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"> 

      <android.support.design.widget.CollapsingToolbarLayout 
       android:id="@+id/collapsing_toolbar" 
       android:layout_width="match_parent" 
       android:layout_height="match_parent" 
       android:fitsSystemWindows="true" 
       app:contentScrim="?attr/colorPrimary" 
       app:layout_scrollFlags="scroll|exitUntilCollapsed"> 

       <FrameLayout 
        android:id="@+id/bannerFrame" 
        android:layout_width="match_parent" 
        android:layout_height="wrap_content" 
        android:fitsSystemWindows="true" 
        app:layout_collapseMode="parallax" /> 

      </android.support.design.widget.CollapsingToolbarLayout> 

     </android.support.design.widget.AppBarLayout> 

    <android.support.v4.widget.NestedScrollView 
     android:layout_width="match_parent" 
     android:id="@+id/nestedScrollView" 
     android:layout_height="wrap_content"> 
     <FrameLayout 
      android:id="@+id/productListFrame" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" /> 
    </android.support.v4.widget.NestedScrollView> 




</android.support.design.widget.CoordinatorLayout> 

MainActivity.java

AppBarLayout appBarLayout = (AppBarLayout)findViewById(R.id.appbar); 
     appBarLayout.addOnOffsetChangedListener(new AppBarStateChangeListener() { 
      @Override 
      public void onStateChanged(AppBarLayout appBarLayout, State state) { 
       if(state == State.COLLAPSED){ 
        Log.i("ScrollView", "COLLAPSED"); 
       } 
       else { 

        Log.i("ScrollView", "UNCOLLAPSED"); 
       } 

      } 
     }); 


     BannerFragment bannerFragment = BannerFragment.newInstance(); 
     ProductListFragment productListFragment = ProductListFragment.newInstance(); 

     FragmentTransaction ft = getSupportFragmentManager().beginTransaction(); 
     ft.addToBackStack("Banner"); 
     ft.add(R.id.bannerFrame, bannerFragment, "Banner"); 
     ft.commit(); 

     ft = getSupportFragmentManager().beginTransaction(); 

     ft.addToBackStack("ProductList"); 
     ft.add(R.id.productListFrame, productListFragment, "ProductList"); 
     ft.commit(); 

ProductListFragment.java

@Override 
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) { 
     super.onViewCreated(view, savedInstanceState); 
     recyclerView = (RecyclerView) view.findViewById(R.id.recycler_view); 

     mAdapter = new MoviesAdapter(movieList); 
     GridLayoutManager mLayoutManager = new GridLayoutManager(getContext(), 1); 
     recyclerView.setLayoutManager(mLayoutManager); 
     recyclerView.setItemAnimator(new DefaultItemAnimator()); 
     recyclerView.setHasFixedSize(true); 

     recyclerView.addOnScrollListener(new EndlessRecyclerOnScrollListener((GridLayoutManager)recyclerView.getLayoutManager()) { 
      @Override 
      public void onLoadMore(int current_page) { 
       if(current_page == 2){ 
        prepareMovieData2(); 
       } 
      } 
     }); 
     recyclerView.setAdapter(mAdapter); 
     prepareMovieData(); 
    } 

Answer 1

вы должны установить фиксированную высоту для Recyclerview или FrameLayout в NestedScrollView, если вы установите Match_Parent attr в свой RecyclerView