Wai Yan Hein Wai Yan Hein - 6 months ago 45
Android Question

Android parallax effect CollapsingToolbarLayout with ViewGroup Layout is not working

I am developing an Android app. In my app, I am using CollapsingToolbarLayout for parallax effect. Before I used AppbarLayout, CollapsingToolbarLayout together with ViewPager, I was working fine. But this time, I replaced view holder for content with RelativeLayout. So when I scroll up from the content, toolbar is not collapsed. I mean when I scroll up from the position I circled in the screenshot below.

enter image description here

But if I scroll up from the toolbar area, it is working. I mean the area in the screenshot.

enter image description here


This is my xml layout


<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="match_parent"
android:background="@android:color/background_light"
android:fitsSystemWindows="true"
>

<android.support.design.widget.AppBarLayout
android:id="@+id/ai_app_bar"
android:layout_width="match_parent"
android:layout_height="300dp"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
android:fitsSystemWindows="true"
>

<android.support.design.widget.CollapsingToolbarLayout
android:id="@+id/main.collapsing"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_scrollFlags="scroll|exitUntilCollapsed"
android:fitsSystemWindows="true"
app:contentScrim="?attr/colorPrimary"
app:expandedTitleMarginStart="48dp"
app:expandedTitleMarginEnd="64dp"
>

<RelativeLayout
android:background="@drawable/item"
app:layout_collapseMode="parallax"
android:layout_width="match_parent"
android:layout_height="match_parent">
<View
android:background="@color/lightGray"
android:layout_width="match_parent"
android:layout_height="match_parent"></View>
</RelativeLayout>

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


<RelativeLayout
app:layout_behavior="android.support.design.widget.AppBarLayout$ScrollingViewBehavior"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:text="This is testing"
android:textColor="@color/textColorPrimary"
android:layout_centerInParent="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RelativeLayout>

<android.support.design.widget.FloatingActionButton
android:id="@+id/ai_review_fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:clickable="true"
android:src="@android:drawable/btn_star"
android:layout_margin="10dp"
android:visibility="gone"
app:layout_anchor="@id/ai_app_bar"
app:layout_anchorGravity="bottom|right|end"
/>
</android.support.design.widget.CoordinatorLayout>


Please why toolbar is not collapsed when I scroll up from the relative layout area? Please how can I fix that to be the toolbar collapsed if I scroll up from the RelativeLayout area. Please help me. How can I fix it please?

Answer

Edited: CollapsingToolbar needs RecyclerView or NestedListView to work.

You should use RecyclerView instead of RelativeLayout outside of the AppBarLayout and add this view tag to it app:layout_behavior="@string/appbar_scrolling_view_behavior"

string/appbar_scrolling_view_behavior maps to AppBarLayout.ScrollingViewBehavior, which is used to notify the AppBarLayout when scroll events occur on this particular view.

From here Handling Scrolls with CoordinatorLayout