Develop Reference

Scroll lag in coordinate layout with viewpager

When switching pages in viewpager under appbarlayout the scroll does not work properly. Since the app:layout_scrollFlags="scroll" is used the appbarlayout should scroll smoothly out of screen when viewpager below is scrolled.
Check the video (after 12 seconds) https://www.youtube.com/watch?v=_gY-7SiDiFs
Here is a gif of the issue https://imgur.com/a/xHvDRhJ
Any help is appreciated.
Thanks.
Here is the layout
<android.support.design.widget.CoordinatorLayout
android:id="#+id/detail_main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<android.support.design.widget.AppBarLayout
android:id="#+id/appbarlayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
app:elevation="0dp">
<android.support.design.widget.CollapsingToolbarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_scrollFlags="scroll">
<FrameLayout
android:id="#+id/detail_thumbnail_root_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#android:color/black"
android:clickable="true"
android:focusable="true"
android:foreground="?attr/selectableItemBackground"
app:layout_collapseMode="parallax">
</FrameLayout>
</android.support.design.widget.CollapsingToolbarLayout>
<RelativeLayout
android:id="#+id/fdsafsda123"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?android:windowBackground"
app:layout_scrollFlags="scroll">
</RelativeLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
<android.support.design.widget.TabLayout
android:id="#+id/tablayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom|center"
android:background="#color/transparent_background_color"
app:tabBackground="#drawable/tab_selector"
app:tabGravity="center"
app:tabIndicatorHeight="0dp">
</android.support.design.widget.TabLayout>
</android.support.design.widget.CoordinatorLayout>

You should be able to hide the CollapsingToolbarLayout by adding another flag like this:
app:layout_scrollFlags="scroll|snap"
And to hide RelativeLayout, you can try this:
app:layout_scrollFlags="scroll|enterAlways"
And you'll need this to pin your view:
app:layout_collapseMode="pin"
Only scroll flag might not be enough.

Hide toolbar on scroll and keep it hidden unless on far top

I am using the following code to hide my toolbar when I scroll on my main activity and it works perfectly. Though, I want to change its behavior a little:
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/coordinatorLayout"
android:layout_height="match_parent"
android:layout_width="match_parent"
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.support.v7.widget.Toolbar
android:id="#+id/toolbarsdfs"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways"/>
<android.support.design.widget.TabLayout
android:id="#+id/tabLayout"
android:scrollbars="horizontal"
android:layout_below="#+id/toolbarsdfs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
app:tabTextColor="#android:color/white"
app:tabSelectedTextColor="#android:color/white"
app:tabIndicatorColor="#android:color/white"
app:tabIndicatorHeight="3dp" />
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="fill_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
android:layout_below="#+id/tablayout"/>
</android.support.design.widget.CoordinatorLayout>
I want the toolbar to only show when the user reaches the far top of the view. I have a recyclerview that has a lot of rows. I want the user to be able to go up and down without being bothered by the toolbar unless he reaches the very top of the view. How can this be done? Thanks.
Edit: edited the code.

in content_main.XML use android.support.v4.widget.NestedScrollView instead of ScrollView.
also use app:layout_behavior="#string/appbar_scrolling_view_behavior" inside android.support.v4.widget.NestedScrollView like below.
<android.support.v4.widget.NestedScrollView
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:id="#+id/textone"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="hello world"
android:textSize="25dp"
android:textStyle="bold" />
/// Add your other code here
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
reference from hear : How to hide ToolBar when i scrolling content up in android

How to have an anchored view inside a ScrollView?

everyone. I'm doing an android app and I'm trying to replicate some of the facebook messenger behaviors. My activity has a coordinatorlayout, inside a tableyout and a viewpager. It's working fine but in a fragment I have a recyclerview inside a nestedscrollerview. Specifically some views, a textview then the recyclerview, I'd like that when scrolling down when it reaches the text above the reyclerview, this text stays anchored in the top and it never gets hidden by the nestedscrollview. Just like the facebook messenger app, like this:
facebook1
facebook2
I thought about having a hidden textview outside of the nestedscrollview that becomes visible when the scrollview reaches the other textview, so it looks anchored but I wanted to know if there is a better way of doing this. Thank you.
Here's a simplified version of the code:
Activity's layout:
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.v7.widget.Toolbar
android:id="#+id/tool_bar"
android:layout_width="match_parent"
layout="#layout/tool_bar"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light" />
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabMode="fixed"
app:tabGravity="fill"/>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
Fragment Layout:
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginBottom="30dp"
android:background="#color/background">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:layout_margin="25dp">
<TextView ..../>
<TextView ..../>
<!-- I need this textview to be anchored when it's reached by the scrollview -->
<TextView
android:id="#+id/anchored_textView"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<android.support.v7.widget.RecyclerView
android:id="#+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#android:color/transparent"
android:divider="#android:color/darker_gray"
android:dividerHeight="0.2dp"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
</LinearLayout>
</android.support.v4.widget.NestedScrollView>

I want to scroll smoothly in this activity

Now, my statuses are.
Toolbar, ImageView, NestedScrollView, TabLayout and (NestedScrollView and RecyclerView in) ViewPager with PagerFragmentAdapter in Coordinator Layout
I want to scroll smoothly in this Activty, with CoordinatorLayout.Behaviors.
I think that should have 3 Behaviors with NestedScrollingChild, HeaderBehavior of First NestedScrollView and TabLayoutBehavior of TabLayout and ViewPagerBehavior of ViewPager (with NestedScrollView and RecyclerView).
I don't know what how can manage their NestedScrolling.
Please give me some advices or solutions.
Thanks :)
<?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"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
android:minHeight="?android:attr/actionBarSize"
app:contentInsetEnd="0px"
app:contentInsetStart="0px">
<!-- Toolbar Layout Here -->
</android.support.v7.widget.Toolbar>
<ImageView
android:id="#+id/iv_top_photo"
android:layout_width="match_parent"
android:layout_height="450dp"
android:scaleType="centerCrop" />
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_behavior=".HeaderBehavior">
<LinearLayout
android:id="#+id/header_content_container"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#android:color/white"
android:orientation="vertical">
<!-- Header Layout Here -->
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
<android.support.design.widget.TabLayout
android:id="#+id/tab_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#FFF"
android:minHeight="?android:attr/actionBarSize"
app:layout_behavior=".TabLayoutBehavior"
app:tabIndicatorColor="#color/colorPrimary"
app:tabIndicatorHeight="3dp"
app:tabSelectedTextColor="#color/colorPrimary"
app:tabTextColor="#000" />
<android.support.v4.view.ViewPager
android:id="#+id/view_pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true"
android:overScrollMode="never"
app:layout_behavior=".ViewPagerBehavior" />
</android.support.design.widget.CoordinatorLayout>

CoordinatorLayout using the ViewPager's RecyclerView

I am using the view CoordinatorLayout from android.support.design. I want to attach the app:layout_behavior to the fragment's RecyclerView?
In the example given by Google, they only attach it in the RecyclerView of the same XML file where the CoordinatorLayout was attached.
Is there a way to attach CoordinatorLayout to the fragment's RecyclerView within the ViewPager?
The sample is in this blog post at Android Developers blog.

Chris Banes has posted a sample on Github which shows exactly what you want to do.
Here is the xml file that defines how one can indirectly attach a coordinator layout to the viewpager's fragments.
<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="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"
app:layout_scrollFlags="scroll|enterAlways" />
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
<android.support.design.widget.FloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="end|bottom"
android:layout_margin="#dimen/fab_margin"
android:src="#drawable/ic_done" />
</android.support.design.widget.CoordinatorLayout>
The idea is to let the viewpager have the layout_behavior attribute.

This might be dumb, but it didn't worked due to the fact that the build tool was not updated in the build.gradle of the application version to 22, I was using 21 that is why it is not working as expected to be.
Edit:
Also what SanderTuit said: adding com.android.support:recyclerview-v7:22.2.0 will also solve the problem

Use a FrameLayout and inject your fragment into that FrameLayout. Then set
app:layout_behavior to it. The only thing you need to do is set layout_behavior
to a sibling of AppBayLayout and that sibling will below the toolbar.
<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="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"
app:layout_scrollFlags="scroll|enterAlways" />
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</android.support.design.widget.AppBarLayout>
<FrameLayout
android:id="#+id/frame"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
</android.support.design.widget.CoordinatorLayout>

I recently had the same problem mentioned in the post, and the above solutions did not work for me. Luckily I managed to solve it. So just to share I am posting here
The problem was that in my code I had set
recyclerView.setNestedScrollingEnabled(false);
due to which the appbar was not responding to recyclerView's scrolls despite setting the layout_behaviour attribute to the viewPager. Changing the above-mentioned attribute to
recyclerView.setNestedScrollingEnabled(true);
solved the problem and the appbar started responding to the recylerView's scroll.

After a few tests, I found that put the TabLayout outside AppBarLayout, will works, whatever the viewpager's Fragment contains. This is my main xml.
<com.tqmall.legend.konwledge.view.VerticalSwipeRefreshLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/swipe_refreshLayout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.CoordinatorLayout
android:id="#+id/coordinator_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#FFE6ECF0">
<android.support.design.widget.AppBarLayout
android:id="#+id/kn_main_appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.design.widget.CollapsingToolbarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:contentScrim="#android:color/black"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<include
layout="#layout/banner_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_collapseMode="parallax"
app:layout_collapseParallaxMultiplier="0.9" />
<android.support.v7.widget.Toolbar
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:layout_gravity="bottom"
android:background="#33000000"
app:layout_collapseMode="parallax"
app:layout_collapseParallaxMultiplier="0"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light">
</android.support.v7.widget.Toolbar>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<android.support.design.widget.TabLayout
android:id="#+id/main_fragment_issue_list_tab"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
app:tabGravity="center"
app:tabIndicatorColor="#FF2CA2D5"
app:tabPaddingEnd="30sp"
app:tabPaddingStart="30sp"
app:tabSelectedTextColor="#FF2CA2D5"
app:tabTextColor="#FF4F5354" />
<android.support.v4.view.ViewPager
android:id="#+id/main_fragment_issue_list_pager"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>

I'm having the same problem, i solved the scrolling but putting toolbar and the tabs inside the app bar and wrap it and the viewpager with a coordinatorlayout.
Also in the layout of my recycle view(to be inflated) i add the layout_behavior. It works but the problem is everything is over each other.
This is my main page
<android.support.design.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="#+id/music_foot"
>
<android.support.v4.view.ViewPager
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/view_pager"
/>
<view
android:layout_width="match_parent"
android:layout_height="wrap_content"
class="android.support.design.widget.AppBarLayout"
android:id="#+id/appBar"
>
<android.support.v7.widget.Toolbar
android:layout_width="match_parent"
android:layout_height="56dp"
android:background="#1e88e5"
android:id="#+id/toolbar"
app:layout_scrollFlags="scroll|enterAlways"
></android.support.v7.widget.Toolbar>
<view
android:layout_width="match_parent"
android:layout_height="56dp"
class="com.astuetz.PagerSlidingTabStrip"
android:id="#+id/pager_tabs"
android:layout_below="#+id/appBar"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
</view>
and this is my layout for the adapter
<android.support.v7.widget.RecyclerView
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"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
android:id="#+id/recycleView" />
If I get it to work better ill tell you.