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Strange behaviour of recyclerview in nestedscrollview

I have a layout like below. Problem is that the recyclerview height only shows one item.
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.NestedScrollView 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">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_margin="#dimen/activity_horizontal_margin">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Live Transactions"
android:textStyle="bold"/>
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:srcCompat="#drawable/ic_refresh"
android:background="#android:color/transparent"/>
</LinearLayout>
<android.support.v7.widget.RecyclerView
android:id="#+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
Strange thing is that when I change the attribute
app:srcCompat="#drawable/ic_refresh"
in the ImageButton to something like
app:srcCompat="#android:drawable/ic_menu_search"
the recyclerview height becomes normal most items show. The ImageButton is on a layout above RecyclerView. Why does this happen?

You have to make your inner linear layout as match parent
<android.support.v4.widget.NestedScrollView 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">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:layout_margin="16dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Live Transactions"
android:textStyle="bold"/>
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:srcCompat="#mipmap/ic_launcher"
android:background="#android:color/transparent"/>
</LinearLayout>
<android.support.v7.widget.RecyclerView
android:id="#+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
</android.support.v4.widget.NestedScrollView>

Solved it simply by adding
android:fillViewport="true"
to the NestedScrollView

Make the layout_height on the Recycler View to match_parent
<android.support.v7.widget.RecyclerView
android:id="#+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent" />

scrollbar in constraint layout not working

I have tried the below code but it doesn't scroll when I rotate my application it will cover most of screen but I need to scroll there it doesn't working there. Is it right way to use scroll view in constraint layout. I have seen this type of example. There it was in working condition I have tried the below code but it doesn't scroll when I rotate my application it will cover most of screen but I need to scroll there it doesn't working there. Is it right way to use scroll view in constraint layout. I have seen this type of example.
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
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">
<include layout="#layout/tool_bar" />
<ScrollView
android:id="#+id/scrollView2"
android:layout_width="match_parent"
android:layout_height="611dp"
android:layout_marginTop="70dp"
android:scrollbars="none"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="0dp"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:weightSum="2">
<ImageView
android:id="#+id/main_bmi"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:src="#drawable/bmi" />
<ImageView
android:id="#+id/bmr"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:src="#drawable/bmr" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:orientation="horizontal"
android:weightSum="2">
<ImageView
android:id="#+id/ideal_weight"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:src="#drawable/ideal" />
<ImageView
android:id="#+id/water_intake"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:src="#drawable/water" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:orientation="horizontal"
android:weightSum="2">
<ImageView
android:id="#+id/calorie"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:src="#drawable/calories" />
<ImageView
android:id="#+id/nutrition"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:src="#drawable/nutrition" />
</LinearLayout>
</LinearLayout>
</ScrollView>
</android.support.constraint.ConstraintLayout>

follow this layer it might work.put appbarlayout inside ConstraintLayout layout
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<!--add your scrollview or nestedscrollview here-->
</LinearLayout>
</android.support.design.widget.AppBarLayout>

Your ScrollView height is fixed to 611dp.
If you use a fixed size, then the content should be greater than 611dp to be able to scroll.
You should use
<ScrollView
android:id="#+id/scrollView2"
android:layout_width="match_parent"
android:layout_height="match_parent"
....>

Wrapping all elements in RecycleView

I have two recyclerViews (one under second). How to make them not to scale and resize to all elements height, so their scrolling won't be necessary and all items will be visible by scrolling main ScrollView?
Now it looks that:
My 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"
android:id="#+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
android:fitsSystemWindows="true">
<android.support.design.widget.AppBarLayout
android:id="#+id/appBarLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/AppTheme.AppBarOverlay">
<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/AppTheme.PopupOverlay" />
</android.support.design.widget.AppBarLayout>
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentBottom="true"
android:layout_below="#+id/appBarLayout"
>
<LinearLayout
android:id="#+id/content_detail"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
android:orientation="vertical"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<LinearLayout
android:layout_width="0px"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="horizontal">
<ImageView
android:id="#+id/ivPoster"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:layout_weight="1"
app:srcCompat="#mipmap/ic_launcher" />
</LinearLayout>
<LinearLayout
android:layout_width="0px"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center"
android:orientation="vertical">
<TextView
android:id="#+id/tvTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:text="Title"
android:textSize="18sp"
android:textStyle="bold" />
<TextView
android:id="#+id/tvDate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="01.01.2001" />
<TextView
android:id="#+id/tvRate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="5.10/10" />
<Button
android:id="#+id/btFav"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Mark as favourite"
android:textSize="12sp" />
</LinearLayout>
</LinearLayout>
<TextView
android:id="#+id/tvOverview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:text="Lorem Ipsum" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:textColor="#000df0"
android:text="Trailers:" />
<android.support.v7.widget.RecyclerView
android:id="#+id/trailerRecyclerView"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:textColor="#000df0"
android:text="Reviews:" />
<android.support.v7.widget.RecyclerView
android:id="#+id/reviewRecyclerView"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
</ScrollView>
</RelativeLayout>
</android.support.design.widget.CoordinatorLayout>

The easiest solution to your problem is to use NestedScrollView instead of ScrollView as the root scrolling element.
but...
if you really think about all this, it's not really a solution in terms of the performance of your code. Because it will look as desired but it will not be really efficient.
If your RecyclerView wraps its contents (the way you want it to) it inflates all items at once, and not really uses its recycling capabilities. It does not reuse any items it just keeps everything in memory. Essentially it becomes a component that creates a ton of Views using an Adapter based on some data, instead of a RecyclerView.
The way you should implement a thing like that is to create an Adapter that inflates multiple types of Views (4 types to be exact in your case), and use a single RecyclerView instead of your whole ScrollView. There are multiple threads here on SO that describe how to create such Adapters. For example here.
To help you a bit more, here's how you should plan your view types:

Scrolling is not smooth while using 3 recyclerviews inside nestedscrollview in android

I have three recyclerviews in a single layout file which have horizontally aligned layoutmanagers and these recyclerviews are inside nestedscrollview and I've set the nestedscrolling for each of the three recyclerviews to false too.
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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:id="#+id/frameLayout"
android:background="#drawable/background">
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:id="#+id/linearLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="5dp"
android:text="FREE MOVIES"
android:textStyle="bold"
android:textSize="18sp"
android:textColor="#color/colorAccent"
/>
<view
android:id="#+id/recycler_view"
class="android.support.v7.widget.RecyclerView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerInParent="true" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="5dp"
android:text="PREMIUM MOVIES"
android:textColor="#color/colorAccent"
android:textStyle="bold"
android:textSize="18sp" />
<view
android:id="#+id/recycler_view1"
class="android.support.v7.widget.RecyclerView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerInParent="true" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:orientation="vertical">
<TextView
android:id="#+id/tvTrending"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="5dp"
android:text="PACKAGES"
android:textColor="#color/colorAccent"
android:textStyle="bold"
android:textSize="18sp" />
<view
android:id="#+id/recycler_view2"
class="android.support.v7.widget.RecyclerView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:dividerHeight="10.0sp" />
</LinearLayout>
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
<ProgressBar
android:id="#+id/progress"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:visibility="gone"
android:layout_gravity="center"/>
</FrameLayout>
And this is the layout of a fragment which I've called from a viewpager from MainActivity. Which has a layout like this
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/res-auto"
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="com.newitventure.musicnepal.MainActivity">
<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/coordinatorLayout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:id="#+id/tabanim_appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<include
android:id="#+id/tool_bar"
layout="#layout/toolbar" />
<android.support.design.widget.TabLayout
android:id="#+id/tabLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabMaxWidth="0dp"
android:background="#color/colorPrimaryDark"
app:tabGravity="fill"
app:tabTextAppearance="#style/MyCustomTextAppearance"
app:tabMode="scrollable" />
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/tabanim_viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginBottom="50dp"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
</android.support.design.widget.CoordinatorLayout>
<LinearLayout
android:id="#+id/gad_bottom"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_gravity="bottom"
android:orientation="horizontal"
android:visibility="visible">
</LinearLayout>
</RelativeLayout>
The problem is while trying to scroll in this layout the scrolling is not smooth. It gets very laggy while trying to scroll both vertically and horizontally. What might be the issue here?

This has solved my problem:
mRecyclerView.setNestedScrollingEnabled(false);
For details :
Recyclerview inside ScrollView not scrolling smoothly

Okay,
I see three possibilities from the code given
1) You're using a RelativeLayout at the root for your views. While the RelativeLayout is awesome for a lot, it does have its drawbacks. Due to how RelativeLayout is built up it measures itself twice and all children in it. So for every frame currently displayed Android needs to recalculate every view twice.
2) You do have a "rather" deep structure on your views and I think that you for example can get rid of each of the 3 linear layouts you have around the pair of TextView and recycleview.
3) You're doing something heavy in the bindView method when displaying your recyclerviews.
Now all three of these could matter and play a role in making it laggy.
I would probably start with 2 (I don't think this alone will solve it completely, but it should improve the readability and speed of the code)
Then I would check for 3 (If you paste your code for the Adapter I could have a look on it if there's something clear there). If that still doesn't help try 1 (which can be hard as RelativeLayout is very good for structuring code)
Hope it helps!

need android layout advise

i want to create layout as attached below.
As you see i have added fixed buttons to bottom on the layout.
and now i have problem when content part has more than 9 elements.
While it is going to scroll, last elements are hiding back of the bottom buttons and not scrolling fully as below:
Please give me advise how to do it? Please notice i am not professional android developer.
I am now going to attach my xml layout files. Here you are:
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:elevation="0dp"
android:popupTheme="#style/AppTheme.PopupOverlay"
android:theme="#style/ToolbarColoredBackArrow" />
<android.support.design.widget.TabLayout
android:id="#+id/tab_layout"
style="#style/MyCustomTabLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/toolbar"
app:tabGravity="fill" />
</android.support.design.widget.AppBarLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ScrollView
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</ScrollView>
<LinearLayout
android:id="#+id/ButtonsLinearLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:background="#F5F5F5"
android:orientation="vertical">
<View
android:layout_width="match_parent"
android:layout_height="0.5dp"
android:background="#808080" />
<LinearLayout
android:id="#+id/footer_button_icons_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#F5F5F5"
android:orientation="horizontal">
<android.support.v7.widget.AppCompatButton
android:layout_width="0dp"
android:layout_height="fill_parent"
android:layout_weight="1"
android:background="#F5F5F5"
android:drawablePadding="3dp"
android:drawableTop="#drawable/ic_xxx"
android:gravity="center|center"
android:text="#string/footer_xxx"
android:textAllCaps="false"
android:textColor="#color/xxx_gray_darker"
android:textSize="12sp" />
<android.support.v7.widget.AppCompatButton
android:layout_width="0dp"
android:layout_height="fill_parent"
android:layout_margin="2dp"
android:layout_weight="1"
android:background="#drawable/borderless_button"
android:drawablePadding="3dp"
android:drawableTop="#drawable/ic_xxx"
android:gravity="center|center"
android:text="#string/footer_xxx"
android:textAllCaps="false"
android:textColor="#FFFFFF"
android:textSize="12sp" />
<android.support.v7.widget.AppCompatButton
android:layout_width="0dp"
android:layout_height="fill_parent"
android:layout_weight="1"
android:background="#F5F5F5"
android:drawablePadding="3dp"
android:drawableTop="#drawable/ic_xxx"
android:gravity="center|center"
android:text="#string/footer_xxx"
android:textAllCaps="false"
android:textColor="#color/xxx_gray_darker"
android:textSize="12sp" />
</LinearLayout>
</LinearLayout>
</RelativeLayout>
Here is a First Fragment layout xml of ViewPager
<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="wrap_content">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:paddingLeft="20dp"
android:paddingRight="20dp"
android:paddingTop="40dp"
android:showDividers="middle"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<GridView
android:id="#+id/gridView"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:numColumns="3"
android:stretchMode="columnWidth"
android:verticalSpacing="20dp"></GridView>
</LinearLayout>

set android:layout_above in your scrollView
<ScrollView android:layout_above="#id/ButtonsLinearLayout"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
your ScrollView should be above LinearLayout which consist Buttons.

There is no need to use ScrollView in view pager. Remove ScrollView for the ViewPager whose id is pager.

paddingBottom is what you want. Add paddingBottom to your ScrollView or any other layout which is the container of the items. The padding should be slightly greater than the height of the bottom strip.
<ScrollView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:paddingBottom="48dp">