Develop Reference

RecyclerView inside another RecyclerView is not scrolling

My situation is simple. I have one RecyclerView and inside it is a few other RecyclerViews. The internal RecyclerViews do not scroll when I try to scroll them.
Why is this? Is there a workaround?
Root XML with root RecyclerView:
<?xml version="1.0" encoding="utf-8"?>
<com.boxed.v2.ui.category.SortAndFilterView android:id="#+id/sortfilterview"
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:layout_marginTop="?actionBarSize"
android:focusable="true"
android:focusableInTouchMode="true"
android:orientation="vertical"
android:elevation="3dp"
app:contentViewId="#+id/content"
app:progressViewId="#+id/progressbar"
app:secondaryViewId="#+id/error">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/white"
android:layout_marginTop="55dp"
android:paddingTop="10dp"
android:clickable="true"
android:orientation="vertical">
<TextView
android:id="#+id/textview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#color/bright_teal"
android:text="Sort & Filters"
android:paddingLeft="12dp"
app:fontName="#string/font_sofia_medium"
android:textAllCaps="false"
android:textSize="24sp"
/>
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:id="#+id/recycler_view"
android:background="#color/white"
android:orientation="vertical"
android:layout_margin="10dp"
></android.support.v7.widget.RecyclerView>
</LinearLayout>
</com.boxed.v2.ui.category.SortAndFilterView>
Then, nested item view containing nested RecyclerView (one of these per row in the root RecyclerView):
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:background="#drawable/textlines"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="#+id/text_view"
android:layout_width="match_parent"
android:height="55dp"
android:layout_height="wrap_content"
app:fontName="#string/font_sofia_medium"
android:textAllCaps="false"
android:gravity="center_vertical"
android:paddingLeft="5dp"
android:textSize="18sp" />
<LinearLayout
android:id="#+id/collapsable_content"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:visibility="gone"
android:orientation="vertical">
<android.support.v7.widget.RecyclerView
android:id="#+id/embedded_recycler_view"
android:layout_width="match_parent"
android:layout_height="190dp"
android:background="#drawable/textlines"
></android.support.v7.widget.RecyclerView>
</LinearLayout>
</LinearLayout>

The LayoutManager gets Confused on which View to scroll,
To make the inner RV to scroll do this.
Create a NestedScrollView inside the Top RV
Then inside the NestedScrollView Put your second RV
NB
RV = recyvlerView

For a RecyclerView to scroll, one of two things must be true:
The RecyclerView has a smaller height than all of its items
The RecyclerView is inside a scrolling parent
In your case embedded_recycler_view height must be less then collapsable_content ( you have use match_parent and that is wrong) or you add another scrollview inside collapsable_content and then added embedded_recycle
then
set setHasFixedSize to true and also set setRecycledViewPool for child

Android Textview Scrolling Issue

Firstly, I am new to android so if I have missed something basic I do apologise.
I have created a GridView to store some information. The GridView consists of a 3x6 grid. In each cell, there is an image and text directly under the image. As the GridView is so large I have implemented a scrollbar.
This is how the page should look normally and is when first loaded/selected :
Everything looks wonderful, however, when I scroll down to the bottom and then back up, the text seems to wrap up and then push the image out of place. I am not sure why this is?
This is how the page looks after I have scrolled down and they scroll back up :
For the GridView, I have an XML file with the GridView itself along with a TextView at the very top called content_rewards.xml. I have also create an XML file for each picture/text in the grid itself called relics_gridlayout.xml. I believe I am probably missing a property of the TextViews in either one of these files, however, I am not sure which one or which property. I don't think it has anything to do with the grid or adapter itself hence I will not include that code.
content_rewards.xml
<?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:id="#+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/white"
android:fitsSystemWindows="true"
tools:layout_editor_absoluteX="0dp"
tools:layout_editor_absoluteY="25dp">
<GridView
android:id="#+id/customgrid"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_below="#+id/os_texts"
android:columnWidth="100dp"
android:numColumns="auto_fit"
android:stretchMode="spacingWidthUniform"
android:verticalSpacing="35dp"
android:scrollbars="horizontal"
tools:layout_constraintTop_creator="1"
android:layout_marginTop="116dp"
tools:layout_constraintLeft_creator="1"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toTopOf="parent"/>
<TextView
android:id="#+id/textView4"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="B = 0 S = 0 G = 0"
android:textSize="24sp"
tools:layout_constraintRight_creator="1"
tools:layout_constraintBottom_creator="1"
app:layout_constraintBottom_toTopOf="#+id/customgrid"
app:layout_constraintRight_toRightOf="parent"
tools:layout_constraintLeft_creator="1"
android:layout_marginBottom="8dp"
app:layout_constraintLeft_toLeftOf="parent"/>
</android.support.constraint.ConstraintLayout>
relics_gridlayout.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="3dp">
<ImageView
android:id="#+id/os_images"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:src="#mipmap/ic_launcher" />
<TextView
android:layout_below="#+id/os_images"
android:id="#+id/os_texts"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="This is Just Dummy Text"
android:textAlignment="center"
android:textSize="18dp"
android:textStyle="bold"/>
</RelativeLayout>
Any help would be great. Thanks.

<?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"
android:background="#ECEFF1"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:context=".MainActivity"
tools:showIn="#layout/app_bar_main">
<GridView
android:id="#+id/grd1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:gravity="center"
android:horizontalSpacing="6dp"
android:numColumns="auto_fit"
android:stretchMode="columnWidth"
android:verticalSpacing="6dp">
</GridView>
</RelativeLayout>
This should solve your problem.
The scrolling view behavior will handle the scrolling irrespective of the size
Now add the Text view out of the Relative layout to view it always.
Or have a parent as Nested scrolling View and allow the nested scrolling enabled as false
setNestedScrollingEnabled(false)
A sample from my code that I already have used successfully to resolve such issue
Use your Grid view instead of Recycler View.
If you want the Item Text View to be always of 2 lines then set munLines="2" in the item Layout
<android.support.v4.widget.SwipeRefreshLayout
android:id="#+id/swipe_container_reports"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<android.support.v7.widget.AppCompatTextView
android:id="#+id/tab_header"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginTop="8dp"
android:text="#string/user_reports"
android:textAllCaps="true"
android:textColor="#color/colorPrimaryDark"
android:textSize="#dimen/tab_label"
app:textAllCaps="true" />
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.RecyclerView
android:id="#+id/reports_recycler"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fadeScrollbars="false"
android:nestedScrollingEnabled="false"
android:padding="4dp" />
</RelativeLayout>
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
</android.support.v4.widget.SwipeRefreshLayout>

This is a problem that i faced as well , the only solution that i could come up with was hardcoding the height of the grid item.
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="100dp"
android:padding="3dp">
A better option would be to use recycler view with a grid layout manager.

you can use LinearLayout and assign weights so that every item in your grid view occupy same space
Update the relics_gridlayout.xml with below code ( you may need to adjust gravity and layout weights)Try this
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/linearLayout_root_single_home_option"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ImageView
android:id="#+id/os_images"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#mipmap/ic_launcher"
android:layout_weight="9" />
<TextView
android:id="#+id/os_texts"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="This is Just Dummy Text"
android:textSize="18dp"
android:textStyle="bold"
android:layout_weight="1" />
</LinearLayout>

RecyclerView with table like layout and Sticky header -- Originally tried NestedScrollView with no success

I am building a daily schedule like for students. This schedule is in a fragment. I need a sticky header with seven day labels and then the items need to scroll underneath, all at once. In addition I need the entire view to scroll horizontally.
Currently I have a HorizontalScrollView, some nested LinearLayouts, and a NestedScrollView. There are 7 RecyclerViews that are children of the NestedScrollView, one for each day of the week. This is so that I can call setNestedScrollingEnabled(false) on each RecyclerView so they scroll together. Currently the result is that the NestedScrollView clips the RecyclerViews to 1 item and no scrolling is possible. If I remove the NestedScrollView The RecyclerViews all scroll individually which is not what I want.
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:gravity="center"
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="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"
android:elevation="4dp" />
<FrameLayout
android:layout_below="#id/toolbar"
android:id="#+id/frame_container"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</RelativeLayout>
fragment_schedule.xml
<?xml version="1.0" encoding="utf-8"?>
<HorizontalScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:paddingLeft="16dp"
android:paddingRight="16dp"
android:paddingTop="8dp"
android:paddingBottom="8dp">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical">
<ProgressBar
android:id="#+id/loading"
android:layout_width="74dp"
android:layout_height="74dp"
android:visibility="gone"
android:layout_gravity="center"/>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
>
...7 ImageViews representing days of week...
</LinearLayout>
<android.support.v4.widget.NestedScrollView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:fillViewport="true">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:fillViewport="true"
android:layout_marginTop="8dp">
<android.support.v7.widget.RecyclerView
android:id="#+id/sunday_list"
android:layout_width="84dp"
android:layout_height="wrap_content"
tools:background="#color/accent_gold"/>
<android.support.v7.widget.RecyclerView
android:id="#+id/monday_list"
android:layout_width="84dp"
android:layout_height="wrap_content"
android:layout_marginLeft="8dp"
tools:background="#color/accent_gold"/>
<android.support.v7.widget.RecyclerView
android:id="#+id/tuesday_list"
android:layout_width="84dp"
android:layout_marginLeft="8dp"
android:layout_height="wrap_content"
tools:background="#color/accent_gold"/>
<android.support.v7.widget.RecyclerView
android:id="#+id/wednesday_list"
android:layout_width="84dp"
android:layout_height="wrap_content"
android:layout_marginLeft="8dp"
tools:background="#color/accent_gold"/>
<android.support.v7.widget.RecyclerView
android:id="#+id/thursday_list"
android:layout_width="84dp"
android:layout_height="wrap_content"
android:layout_marginLeft="8dp"
tools:background="#color/accent_gold"/>
<android.support.v7.widget.RecyclerView
android:id="#+id/friday_list"
android:layout_width="84dp"
android:layout_height="wrap_content"
android:layout_marginLeft="8dp"
tools:background="#color/accent_gold"/>
<android.support.v7.widget.RecyclerView
android:id="#+id/saturday_list"
android:layout_width="84dp"
android:layout_height="wrap_content"
android:layout_marginLeft="8dp"
tools:background="#color/accent_gold"/>
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
</LinearLayout>
</HorizontalScrollView>
The only thing of note in the fragment class is that I call setNestedScrolledEnabled(false) after populating and attaching all of the adapters.
Any insight is greatly appreciated!

The solution in this case is that I was thinking about the requirements too rigidly. I changed my layout to consists of a The header linear layout, a scrollview, and a horizontal recycler view, with each day being an item. In the adapter the item layout is simply a LinearLayout that I programmatically add the class views to(as there is a finite number of classes per day). Scrolling works in both directions. I will retitle the question so hopefully someone can find this working towards similar requirements.
Fragment xml
<?xml version="1.0" encoding="utf-8"?>
<HorizontalScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:paddingLeft="16dp"
android:paddingRight="16dp"
android:paddingTop="8dp"
android:paddingBottom="8dp">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical">
<ProgressBar
android:id="#+id/loading"
android:layout_width="74dp"
android:layout_height="74dp"
android:visibility="gone"
android:layout_gravity="center"/>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
>
...Image Views Representing Days of Week...
</LinearLayout>
<ScrollView
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<android.support.v7.widget.RecyclerView
android:id="#+id/day_list"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
</ScrollView>
</LinearLayout>
</HorizontalScrollView>
RecyclerViewItem.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="84dp"
android:layout_height="match_parent"
android:id="#+id/item_schedule_layout"
android:layout_marginRight="8dp"
android:layout_marginTop="8dp"
android:layout_marginBottom="8dp"
android:layout_marginLeft="0dp">
</LinearLayout>
Then programmatically add views to the LinearLayout. My views for each class were complex so I created a custom view based on the layout I needed for each class and then was able to just define a new instance in a for loop and add it to the LinearLayout.

How to center RecyclerView items horizontally with vertical GridLayoutManager

I have a vertical RecyclerView using a GridLayoutManager. I want each column to be centered, but the columns begin all the way on the left. In the following picture you can see what I'm talking about. I used the ugly color scheme to illustrate the columns and background. The green is the background for each item in the RecyclerView, the red is the background of the RecyclerView itself:
http://imgur.com/a/J3HtF
I'm setting it up with:
mRecyclerView.setLayoutManager(new GridLayoutManager(this, 2));
Here's the column_item.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="120dp"
android:layout_height="180dp"
android:orientation="vertical"
android:padding="4dp">
<ImageView
android:id="#+id/movie_column_photo"
android:layout_width="80dp"
android:layout_height="120dp"/>
<TextView
android:id="#+id/movie_column_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
Here's the recyclerview xml:
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.RecyclerView
android:id="#+id/company_details_recyclerview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical">
</android.support.v7.widget.RecyclerView>
</LinearLayout>

Try letting the column item fill the width of the column while centering everything inside:
<?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="180dp"
android:orientation="vertical"
android:padding="4dp">
<ImageView
android:id="#+id/movie_column_photo"
android:layout_width="80dp"
android:layout_height="120dp"
android:layout_gravity="center_horizontal"/>
<TextView
android:id="#+id/movie_column_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"/>
</LinearLayout>

To restate #kris larson's answer;
If you are using ConstraintLayout, adding android:layout_gravity="center" or android:layout_gravity="center_horizontal" to the parent layout in item's XML would be enough (the first parent in hierarchy).
In your case, the codes would be something similar to this:
<android.support.constraint.ConstraintLayout
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintEnd_toEndOf="parent"
android:layout_width="match_parent"
android:layout_height="180dp"
android:orientation="vertical"
android:padding="4dp"
android:layout_gravity="center">
<ImageView
android:id="#+id/movie_column_photo"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintEnd_toEndOf="parent"
android:layout_width="80dp"
android:layout_height="120dp"/>
<TextView
android:id="#+id/movie_column_title"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toStartOf="parent"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</android.support.constraint.ConstraintLayout>

Simply set the width of the root layout for your column_item.xml to match_parent will center RecyclerView items horizontally.

Wrap your recyclerview inside the constraintlayout, something like this:
<androidx.constraintlayout.widget.ConstraintLayout
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" >
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/book_list"
android:layout_width="wrap_content"
android:layout_height="match_parent"
app:layoutManager="androidx.recyclerview.widget.GridLayoutManager"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:spanCount="2" />
Hope it helps!!

How to make a dynamically moving View float on top of a ViewGroup?

I'm currently using a library that allows me to move freely a CardView in my screen, based on the user's finger. Here's my problem: I have a view Group on top that needs to stay below that CardView, but I'm not managing to do so.
I've tried using Frame Layout, but it didn't work as planned. The best I could do was that
but still, not what I meant to dO (card view completely floating around the "toolbar")
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/framelayout"
android:background="#color/verdeClaro"
tools:context=".View.Activity.LeitorMbookActivity"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:isScrollContainer="true"
>
<com.wenchao.cardstack.CardStack
android:elevation="4dp"
android:layout_marginTop="32dp"
android:id="#+id/cardStackContainer"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding = "20dp"
android:clipChildren="false"
android:clipToPadding="false"
/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="64dp"
android:layout_gravity="top"
android:background="#android:color/transparent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="15"
android:gravity="center_vertical|right"
>
<ImageView
android:id="#+id/home_icon"
android:layout_width="24dp"
android:layout_height="24dp"
android:src="#drawable/ic_home"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="2"
android:gravity="center_vertical"
>
<com.akexorcist.roundcornerprogressbar.RoundCornerProgressBar
android:id="#+id/progress_bar"
android:layout_height="6dp"
android:layout_width="match_parent"
android:layout_marginLeft="16dp"
android:layout_marginRight="24dp"
app:rcProgressColor="#color/white"
app:rcBackgroundColor="#color/verde_musgo"
app:rcRadius="2dp"/>
</LinearLayout>
</LinearLayout>
</FrameLayout>
The library I'm using to move the card is that.