Recyclerview con scrollview interno annidato?

Question

Sto usando multipla View-titolare all'interno riciclatore che inserito all'interno di vista di scorrimento nidificato, v'è un cambiamento nel comportamento naturale di onBindViewHolder() vista Recycler a causa di nidificati Scroll, getItemViewType() tutti gli elementi sono chiamati all'interno onBindViewHolder() quando si avvia l'adattatore del riciclatore, Ad esempio I ha 20 articoli significa nello scenario normale solo tre elementi chiamati all'avvio, ma in caso di vista di scorrimento nidificata tutte le 20 viste vengono create al primo caricamento.

Xml File

<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    android:id="@+id/main_content" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:background="@color/light_gray_vd"> 
    <android.support.design.widget.AppBarLayout 
     android:id="@+id/app_bar_layout" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     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="wrap_content" 
      app:contentScrim="@color/primaryColor" 
      app:expandedTitleMarginEnd="16dp" 
      app:expandedTitleMarginStart="48dp" 
      app:layout_scrollFlags="scroll|exitUntilCollapsed"> 

      <FrameLayout 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       android:fitsSystemWindows="true" 
       app:layout_collapseMode="parallax"> 

       <include 
        android:id="@+id/inc_gallery" 
        layout="@layout/proj_galery_new" 
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" /> 

      </FrameLayout> 

      <View 
       android:layout_width="match_parent" 
       android:layout_height="?attr/actionBarSize" /> 

      <android.support.v7.widget.Toolbar 
       android:id="@+id/toolbar1" 
       android:layout_width="match_parent" 
       android:layout_height="?attr/actionBarSize" 
       android:layout_gravity="top" 
       app:layout_collapseMode="pin" 
       app:popupTheme="@style/ThemeOverlay.AppCompat.Light"> 

       <include 
        android:id="@+id/toolbar_header_view" 
        layout="@layout/header_view" 
        android:layout_width="match_parent" 
        android:layout_height="wrap_content" 
        android:visibility="gone" /> 
      </android.support.v7.widget.Toolbar> 

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

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

    <android.support.v4.widget.NestedScrollView 
     android:id="@+id/vde_mv_scroll_view" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     app:layout_behavior="@string/appbar_scrolling_view_behavior"> 

     <FrameLayout 
      android:id="@+id/rlCollapseScroll" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent"> 
      <android.support.v7.widget.RecyclerView 
       android:id="@+id/view_recycler" 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content"> 

      </android.support.v7.widget.RecyclerView> 



     </FrameLayout> 
    </android.support.v4.widget.NestedScrollView> 
</android.support.design.widget.CoordinatorLayout> 

Answer 1

rimuovere NestedScrollView e frameLayout, e impostare app:layout_behavior="@string/appbar_scrolling_view_behavior" per recycleView come questo:

<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    android:id="@+id/main_content" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:background="@color/light_gray_vd"> 
    <android.support.design.widget.AppBarLayout 
     android:id="@+id/app_bar_layout" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     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="wrap_content" 
      app:contentScrim="@color/primaryColor" 
      app:expandedTitleMarginEnd="16dp" 
      app:expandedTitleMarginStart="48dp" 
      app:layout_scrollFlags="scroll|exitUntilCollapsed"> 

      <FrameLayout 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       android:fitsSystemWindows="true" 
       app:layout_collapseMode="parallax"> 

       <include 
        android:id="@+id/inc_gallery" 
        layout="@layout/proj_galery_new" 
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" /> 

      </FrameLayout> 

      <View 
       android:layout_width="match_parent" 
       android:layout_height="?attr/actionBarSize" /> 

      <android.support.v7.widget.Toolbar 
       android:id="@+id/toolbar1" 
       android:layout_width="match_parent" 
       android:layout_height="?attr/actionBarSize" 
       android:layout_gravity="top" 
       app:layout_collapseMode="pin" 
       app:popupTheme="@style/ThemeOverlay.AppCompat.Light"> 

       <include 
        android:id="@+id/toolbar_header_view" 
        layout="@layout/header_view" 
        android:layout_width="match_parent" 
        android:layout_height="wrap_content" 
        android:visibility="gone" /> 
      </android.support.v7.widget.Toolbar> 

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

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

    <android.support.v7.widget.RecyclerView 
       android:id="@+id/view_recycler" 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       app:layout_behavior="@string/appbar_scrolling_view_behavior" 
       android:scrollbars="vertical"> 

      </android.support.v7.widget.RecyclerView> 

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

Answer 2

Il problema è sia Recyclerview e NestedScrollview sono scorrevole. Rimuovendone uno, dovresti essere in grado di ottenere l'effetto desiderato.

Quindi, provare a utilizzare solo Recyclerviewsenza metterlo all'interno di NestedScrollView. Come questo:

<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    android:id="@+id/main_content" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:background="@color/light_gray_vd" 
    > 
    <android.support.design.widget.AppBarLayout 
     android:id="@+id/app_bar_layout" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     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="wrap_content" 
     app:contentScrim="@color/primaryColor" 
     app:expandedTitleMarginEnd="16dp" 
     app:expandedTitleMarginStart="48dp" 
     app:layout_scrollFlags="scroll|exitUntilCollapsed" 
     > 

     <FrameLayout 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:fitsSystemWindows="true" 
      app:layout_collapseMode="parallax" 
      > 

     <include 
      android:id="@+id/inc_gallery" 
      layout="@layout/proj_galery_new" 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      /> 

     </FrameLayout> 

     <View 
      android:layout_width="match_parent" 
      android:layout_height="?attr/actionBarSize" 
      /> 

     <android.support.v7.widget.Toolbar 
      android:id="@+id/toolbar1" 
      android:layout_width="match_parent" 
      android:layout_height="?attr/actionBarSize" 
      android:layout_gravity="top" 
      app:layout_collapseMode="pin" 
      app:popupTheme="@style/ThemeOverlay.AppCompat.Light" 
      > 

     <include 
      android:id="@+id/toolbar_header_view" 
      layout="@layout/header_view" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:visibility="gone" 
      /> 
     </android.support.v7.widget.Toolbar> 

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

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

    <android.support.v7.widget.RecyclerView 
     android:id="@+id/view_recycler" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     /> 
</android.support.design.widget.CoordinatorLayout> 

È inoltre possibile fare riferimento this example o leggere questo article from Code path about how to handle scroll with CoordinatorLayout

CheeseSquare from Chris Bane ha anche un buon esempio CoordinatorLayout

Answer 3

Ho riscontrato lo stesso problema anche dopo l'aggiornamento della libreria di supporto Android 23.2.0.

Set RecyclerView 's android:layout_height a match_parent.

E disattivare la funzione nuova Misurazione automatica (read more):

LinearLayoutManager layoutManager = new LinearLayoutManager(getContext(), 
    LinearLayoutManager.VERTICAL, false); 
layoutManager.setAutoMeasureEnabled(false); 
recyclerView.setLayoutManager(layoutManager);