Develop Reference

Android how to make recyclerview overscroll bounce affect when pulled past limits?

I am searching for a way to make my recycleView elastic at the top when pulled. Let me show you a image of what i want:
https://raw.githubusercontent.com/baoyongzhang/android-PullRefreshLayout/master/demo.gif
So you can see from that gif, that when the user pulls down on the very top of the list it kind of has an elastic bounce affect. How do i achieve that ? i want this affect so my swipeRefreshLayout doesn't get triggered so easily just by reaching the top. i want them to actually PULL to refresh not just reach the top. my appbar layout looks like this right now:
<?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:id="#+id/main_content"
android:layout_width="match_parent"
android:fitsSystemWindows="false"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:id="#+id/id_appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#android:color/white">
<android.support.design.widget.CollapsingToolbarLayout
android:id="#+id/collapsing_toolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:contentScrim="#color/white"
app:layout_scrollFlags="scroll|exitUntilCollapsed"
app:titleEnabled="false">
<com.mobile..UI.customViews.CategoryBanner
android:id="#+id/shortcutbanner"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_collapseMode="parallax" />
<include layout="#layout/toolbar" />
</android.support.design.widget.CollapsingToolbarLayout>
<android.support.design.widget.TabLayout
android:id="#+id/tabLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabGravity="fill"
app:tabMode="fixed"
android:elevation="6dp"
app:tabSelectedTextColor="#android:color/darker_gray"
app:tabTextColor="#color/black" />
</android.support.design.widget.AppBarLayout>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="fill_vertical"
android:orientation="vertical">
<com.mobile.UI.customViews.HomePageViewPager
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="fill_vertical"
/>
</LinearLayout>
</FrameLayout>
</android.support.design.widget.CoordinatorLayout>
and inside of a tab i have the following recyclerView:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v4.widget.SwipeRefreshLayout
android:id="#+id/swipefeedRefreshLayout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.mobile.UI.customViews.VelocityControlRecyclerView
android:id="#+id/recyclerView"
android:layout_marginTop="0dp"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</android.support.v4.widget.SwipeRefreshLayout>
</LinearLayout>
in my activity i tried calling this but it does not work:
mRecyclerView.setOverScrollMode(View.OVER_SCROLL_ALWAYS);

Android: How to show toolbar when the list is scrolled to top?

I have a problem with toolbar, when I scroll up, the toolbar hide, and when I scroll down, the toolbar show immediately. I want to scroll to top of RecyclerView, the toolbar will show, how can I do it?
Thanks!!!!
<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/dn_main_container"
android:background="#android:color/white"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".phone.activity.ActivityPerspective">
<android.support.v7.widget.RecyclerView
android:id="#+id/listView"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
android:background="#android:color/white"
android:layout_marginTop="-56dp"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<android.support.design.widget.AppBarLayout
app:elevation="0dp"
android:background="#android:color/transparent"
android:fitsSystemWindows="true"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
app:contentInsetStartWithNavigation="0dp"
android:elevation="0dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#android:color/transparent">
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize">
<RelativeLayout
android:layout_gravity="center_vertical"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="wrap_content">
<TextView
android:id="#+id/titleView"
android:text="Author"
android:textSize="9pt"
android:textColor="#4D4D4D"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</RelativeLayout>
<ImageView
android:id="#+id/search"
android:src="#drawable/search_dark"
android:paddingTop="19dp"
android:paddingBottom="19dp"
android:layout_marginLeft="6dp"
android:layout_width="?attr/actionBarSize"
android:layout_height="?attr/actionBarSize" />
</LinearLayout>
</android.support.v7.widget.Toolbar>
</android.support.design.widget.AppBarLayout>

You should add app:layout_scrollFlags="scroll|enterAlways" in child(in your case <android.support.v7.widget.Toolbar>) of <android.support.design.widget.AppBarLayout> to achieve on scroll down hide app bar and on scroll top show app bar.

Use below format code this will work for you what you want.
<?xml version="1.0" encoding="utf-8"?>
<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/activity_notice"
android:orientation="vertical"
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:orientation="vertical"
android:fitsSystemWindows="true"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<include
android:id="#+id/toolbar"
layout="#layout/toolbar" />
</android.support.design.widget.AppBarLayout>
<FrameLayout
app:layout_behavior="#string/appbar_scrolling_view_behavior"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v7.widget.RecyclerView
android:id="#+id/recycler"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clipToPadding="false"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
</FrameLayout>
Toolbar toolbar = (Toolbar)findViewById(R.id.toolbar_help);
setSupportActionBar(toolbar);

Donot want to expand Collapsing toolbar

I am using a collapsing Toolbar. If I start a specific Fragment I want to collapse the Toolbar so it behaves like a "normal" one and that the user can not expand it by himself. Also I want only the views ion nested scrollview to scroll and not the toolbar when i collapse. Here is my layout which I use for my Toolbar:
<?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:id="#+id/coordinator_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<android.support.design.widget.AppBarLayout
android:id="#+id/app_bar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true">
<android.support.design.widget.CollapsingToolbarLayout
android:id="#+id/collapsing_toolbar"
android:layout_width="match_parent"
android:layout_height="#dimen/collapsing_height"
android:fillViewport="true"
android:fitsSystemWindows="true"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<RelativeLayout
android:id="#+id/past_upcoming_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#efeded"
android:fitsSystemWindows="true"
android:orientation="vertical"
app:layout_scrollFlags="scroll|enterAlways|enterAlwaysCollapsed">
<TextView
android:id="#+id/upcoming_heading"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:gravity="center_horizontal"
android:padding="#dimen/spacing_normal_8dp"
android:text="#string/upcoming_appointments"
android:textSize="#dimen/text_size18sp" />
<FrameLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/upcoming_heading">
<android.support.v7.widget.RecyclerView
android:id="#+id/upcoming_appointments_recycler_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_marginTop="10dp"
android:orientation="horizontal" />
<TextView
android:id="#+id/no_upcoming_list"
android:layout_width="wrap_content"
android:layout_height="200dp"
android:layout_gravity="center"
android:gravity="center"
android:text="#string/no_upcoming_appointment"
android:textSize="#dimen/text_size18sp" />
</FrameLayout>
<TextView
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:layout_alignParentBottom="true"
android:layout_gravity="center"
android:gravity="center"
android:text="#string/past_appointments"
android:textSize="#dimen/text_size18sp" />
</RelativeLayout>
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_collapseMode="pin"
app:layout_scrollFlags="scroll|enterAlways">
</android.support.v7.widget.Toolbar>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.widget.NestedScrollView
android:id="#+id/nestedscrollview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#efeded"
android:orientation="vertical">
<android.support.v7.widget.RecyclerView
android:id="#+id/past_appointments_recycle_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" />
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
I have used AppBarLayout.setExpanded(false). It initially shows collapsed, but when I expand back it expands.
I have also used
CoordinatorLayout.LayoutParams lp = (CoordinatorLayout.LayoutParams) mAppBarLayout.getLayoutParams();
lp.height = (int) getResources().getDimension(R.dimen.collapsing_height);
This doesnot stick toolbar to the top. it scrolls up with nested scroll view. Please help.
Thanks in advance

if RecyclerView cant cover a full screen, the CoordinatorLayout will not work?

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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="#color/fragment.background">
<android.support.design.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/fragment.background"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/fragment.background"
android:orientation="vertical"
app:layout_scrollFlags="scroll|enterAlways">
<TextView
style="#style/merchantHintText"
android:id="#+id/contract_template_title"
android:layout_width="match_parent"
android:background="#color/white"
android:padding="15dp"/>
<ImageView
android:layout_width="match_parent"
android:layout_height="1dp"
android:src="#color/fragment.background" />
<com.tqmall.salestool.merchant.task.UploadImgLayout
android:id="#+id/contract_template_imglayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="10dp"
android:background="#color/white"
android:orientation="vertical"
android:padding="15dp" />
<TextView
android:id="#+id/contract_template_info"
style="#style/merchantHintText"
android:layout_width="match_parent"
android:background="#color/white"
android:padding="15dp"/>
<ImageView
android:layout_width="match_parent"
android:layout_height="1dp"
android:src="#color/fragment.background" />
</LinearLayout>
</android.support.design.widget.AppBarLayout>
<com.tqmall.salestool.view.ListRecyclerView
android:id="#+id/contract_template_list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
android:paddingBottom="40dp"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
</android.support.design.widget.CoordinatorLayout>
<TextView
android:id="#+id/contract_template_sure_button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:background="#color/text.red"
android:gravity="center"
android:padding="10dp"
android:textColor="#color/white"
android:textSize="20sp" />
</RelativeLayout>
When my adapter have enough number of data (which inflating a much higher view than screen), the LinearLayout in AppBarLayout will collapse correctly. However, if there are few data, it will not collapse. I read the source code of AppBarLayout, but not find the code cause that.
Why it acts like that?

Just put you Linear layout into CollapsingToolbarLayout like this
<?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="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: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">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<!-- views -->
</LinearLayout>
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_collapseMode="pin"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light" />
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v7.widget.RecyclerView
android:id="#+id/scrollableView"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
</android.support.design.widget.CoordinatorLayout>
Try this. It should work.

How do I fix a layout inside Coordinator Layout?

Currently recycler view and the app bar scrolls . Now I need to fix the relative layout rlProductCheckout to the bottom of the screen even if the recyclerview and app bar scrolls. Current relative layout disappears when I start scrolling, it reappears only when I move back to the start of the list.
content_products_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:showIn="#layout/activity_products_list">
<android.support.v7.widget.RecyclerView
android:id="#+id/rvProductList"
android:layout_above="#+id/rlProductCheckout"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="10dp"
android:gravity="center_vertical"
android:id="#+id/rlProductCheckout"
android:layout_alignParentBottom="true">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Checkout"/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_menu_send"
android:layout_alignParentRight="true"/>
</RelativeLayout>
</RelativeLayout>
activity_products_layout.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"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<android.support.design.widget.AppBarLayout
android:id="#+id/app_bar"
android:layout_width="match_parent"
android:layout_height="#dimen/app_bar_height"
android:fitsSystemWindows="true">
<android.support.design.widget.CollapsingToolbarLayout
android:id="#+id/toolbar_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
app:contentScrim="#color/colorPrimary"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<ImageView
android:id="#+id/expandedImage"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="#mipmap/prod1"
android:scaleType="centerCrop"
app:layout_collapseMode="parallax"
app:layout_collapseParallaxMultiplier="0.7" />
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_collapseMode="pin" />
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<include layout="#layout/content_products_list" />
</android.support.design.widget.CoordinatorLayout>

Try to wrap the RelativeLayout outside the CoordinatorLayout. Try some this like How to put RelativeLayout inside CoordinatorLayout