I have a MainActivity
with a FrameLayout
placeholder where I switch in/out fragments based on the NavigationView selection. I want to be able to have the MainActivity Toolbar scroll off screen when it encounters a scroll behavior in any fragment it contains (even nested fragments).
It works well for HomeFragment (1)
, which only contains a SwipeRefreshLayout
and a RecyclerView
.
However, for the ViewPagerFragment (2)
, which contains a TabLayout
and a ViewPager
with a FragmentStatePagerAdapter
and child fragments of type ViewPagerItemFragment (3)
, it fails to register scroll events on the ViewPagerItemFragment's
containing RecyclerView
.
Complete layouts (stripped of theming or unnecessary attributes) are below.
layout_activity_main:
<android.support.v4.widget.DrawerLayout
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="match_parent"
android:fitsSystemWindows="true">
<android.support.design.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.Toolbar
android:layout_height="?attr/actionBarSize"
android:layout_width="match_parent"
app:layout_scrollFlags="scroll|enterAlways">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center">
<Spinner
android:layout_width="wrap_content"
android:layout_height="match_parent"/>
</LinearLayout>
</android.support.v7.widget.Toolbar>
</android.support.design.widget.AppBarLayout>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"/>
</android.support.design.widget.CoordinatorLayout>
<android.support.design.widget.NavigationView
android:layout_width="@dimen/drawer_width"
android:layout_height="match_parent"
android:layout_gravity="start"
android:fitsSystemWindows="true"/>
</android.support.v4.widget.DrawerLayout>
layout_home_fragment (1):
<android.support.v4.widget.SwipeRefreshLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</android.support.v4.widget.SwipeRefreshLayout>
layout_fragment_viewpager (2):
<LinearLayout 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="match_parent"
android:orientation="vertical">
<android.support.design.widget.TabLayout
android:layout_width="match_parent"
android:layout_height="@dimen/tab_strip_height"/>
<android.support.v4.view.ViewPager
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>
fragment_viewpager_item (3):
<android.support.v4.widget.SwipeRefreshLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</android.support.v4.widget.SwipeRefreshLayout>
Nevermind, apparently I was using another CoordinatorLayout inside another container parent without realizing it. Just make sure you don't have multiple containing CoordinatorLayouts, it will screw up your layouts inside your inner Fragments.