Develop Reference

Android: Show button just below to the recylerview but always on the screen

On the screen, I want to show RecyclerView which start from the top and at the end of the RecyclerView, there is a button.
When RecyclerView is not occupying the entire screen then the Button will sit just below the RecyclerView.
When RecylerView is scrollable then in this case button will sit on the bottom of the screen.
I tried this code. But the problem here, RecyclerView sits in the centre. In my case, it will always start from the top(after the action bar).
Following code I tried:
main layout:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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"
android:background="#b6d7a8" >
<LinearLayout
android:id="#+id/actionBarTermsAndCondition"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/dark_gray"
android:gravity="center_vertical"
android:minHeight="70dp"
android:orientation="horizontal"
android:paddingStart="16dp"
android:paddingTop="10dp"
android:paddingEnd="16dp"
android:paddingBottom="10dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" >
<ImageView
android:id="#+id/closeButton"
android:layout_width="#dimen/spacing_2x"
android:layout_height="#dimen/spacing_2x"
android:layout_gravity="center_vertical"
android:layout_marginEnd="#dimen/spacing_2_5x"
android:clickable="true"
android:contentDescription="#string/close"
android:foreground="?selectableItemBackground"
android:src="#drawable/cross"
android:visibility="invisible" />
<TextView
android:id="#+id/route"
style="#style/ScreenTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:contentDescription="Import Venue"
android:fontFamily="#font/roboto"
android:text="Import Venue"
android:textColor="#color/white"
tools:text="Something" />
</LinearLayout>
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/list"
android:name="DataManagementFragment"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layoutManager="LinearLayoutManager"
app:layout_constrainedHeight="true"
app:layout_constraintBottom_toTopOf="#id/constraint_layout_cloud_access"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/actionBarTermsAndCondition"
app:layout_constraintVertical_chainStyle="packed"
tools:itemCount="3"
tools:listitem="#layout/fragment_data_management_list_row" />
<androidx.constraintlayout.widget.ConstraintLayout
android:id="#+id/constraint_layout_cloud_access"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#FEAB8C"
android:paddingStart="16dp"
android:paddingTop="10dp"
android:paddingBottom="21dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#id/list">
<TextView
android:id="#+id/text_cloud_access"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:fontFamily="#font/roboto"
android:text="Cloud access"
android:textColor="#3C3C41"
android:textSize="16dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:text="Cloud access" />
<TextView
android:id="#+id/text_import_venue"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:fontFamily="#font/roboto"
android:text="Import venue"
android:textColor="#3C3C41"
android:textSize="16dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#id/text_cloud_access"
tools:text="Import place" />
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
RecyclerView row layout:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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:background="#fff2cc"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingEnd="#dimen/spacing_3x"
android:paddingStart="#dimen/spacing_2x"
android:paddingBottom="#dimen/spacing_2_5x"
android:paddingTop="#dimen/spacing_2_5x"
android:orientation="horizontal"
tools:showIn="#layout/fragment_data_management">
<TextView
android:id="#+id/text_floor_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:fontFamily="#font/roboto"
android:textAppearance="?attr/textAppearanceListItem"
android:textColor="#3C3C41"
android:textSize="16dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:text="Preloaded" />
<TextView
android:id="#+id/text_venue_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:fontFamily="#font/roboto"
android:textAppearance="?attr/textAppearanceListItem"
android:textColor="#636367"
android:textSize="12dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#id/text_floor_name"
tools:text="ABC" />
<ImageView
android:id="#+id/imageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:srcCompat="?android:attr/listChoiceIndicatorMultiple"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ImageView
android:id="#+id/imageView2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:srcCompat="?attr/dividerHorizontal" />
</androidx.constraintlayout.widget.ConstraintLayout>

Your RecyclerView is centering between two other layouts. Add
app:layout_constraintVertical_bias="0.0"
to the XML for the RecyclerView to move it to the top. You can look up how bias works in the ConstraintLayout documentation.

I think you can achieve what you want with a guideline. The steps would be the following:
Create an horizontal guideline that sits at the 90% of the screen, meaning that it will be really close to the bottom, on the 10% left is where your button will be when the recycler view becomes scrollable.
Set the bottom constraint of the recycler view to match the top of the guideline and the top of the recycler view to the top of the screen. This will cause that the recycler view appears on the half of your screen.
Set the vertical bias of your recycler view to 0.0, this will stick the recycler view to the top.
Set the top constraint of the button to match the bottom of the recycler view, this will cause that it will stick to the bottom of the recycler view, but since the recycler view (thanks to the guideline) will only grow to 90% of the screen, the button will sit at the bottom of the screen as you want.
It's important to add the following attribute to the recycler view:
app:layout_constrainedHeight="true"
The layout related to the button and recycler view should look something like:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constrainedHeight="true"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toTopOf="#+id/guideline"
app:layout_constraintVertical_bias="0.0"
tools:itemCount="130"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button text"
app:layout_constraintTop_toBottomOf="#+id/list"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"/>
<androidx.constraintlayout.widget.Guideline
android:id="#+id/guideline"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_percent="0.9"/>
</androidx.constraintlayout.widget.ConstraintLayout>
With few items:
With many items:

Android WebView overlaps with other views

I have a simple web view in between image and button. For some reason, if I put a long text, the web view is overlapping with the logo and the button. It works for a short text. I used constraint layout. It seems that the web view is expanding beyond the parent view.
Please see the pictures.
Below is my layout code:
<?xml version="1.0" encoding="utf-8"?> <androidx.constraintlayout.widget.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="wrap_content">
<ImageView
android:id="#+id/iv_logo"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="#dimen/card_big_margin"
android:src="#drawable/login_cashnetusa_color"
android:tint="#color/white"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:ignore="ContentDescription" />
<androidx.cardview.widget.CardView
android:id="#+id/cv_splash_screen"
style="#style/CardTheme"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="#dimen/card_normal_outer_margin"
android:layout_marginTop="#dimen/card_normal_outer_margin"
android:layout_marginRight="#dimen/card_normal_outer_margin"
android:layout_marginBottom="#dimen/card_normal_outer_margin"
app:layout_constraintBottom_toTopOf="#id/btn_cta"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="#id/iv_logo">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/tv_header"
style="#style/CardContent.CustomBlack.Bold"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="#dimen/card_normal_margin"
android:text="#string/dummy_full_name"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<WebView
android:id="#+id/wv_update_text"
style="#style/CardContent.White"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:padding="#dimen/card_normal_margin"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="#id/tv_header" />
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.cardview.widget.CardView>
<Button
android:id="#+id/btn_cta"
style="#style/Button.OrangeGradient"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginLeft="#dimen/card_normal_margin"
android:layout_marginRight="#dimen/card_normal_margin"
android:layout_marginBottom="#dimen/card_item_normal_margin"
android:textSize="16sp"
app:layout_constraintBottom_toTopOf="#id/tv_skip"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
tools:text="#string/dummy_btn_ok" />
<TextView
android:id="#+id/tv_skip"
style="#style/CardContent.White"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="#dimen/card_normal_margin"
android:text="#string/skip"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

The problem lies in here:
<androidx.cardview.widget.CardView
android:id="#+id/cv_splash_screen"
style="#style/CardTheme"
android:layout_width="match_parent"
<-- change layout:height from wrap_content to some specific height let it be 300-400dp -->
android:layout_height="wrap_content"
android:layout_marginLeft="#dimen/card_normal_outer_margin"
android:layout_marginTop="#dimen/card_normal_outer_margin"
android:layout_marginRight="#dimen/card_normal_outer_margin"
android:layout_marginBottom="#dimen/card_normal_outer_margin"
app:layout_constraintBottom_toTopOf="#id/btn_cta"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="#id/iv_logo">
or the second option is you can use minHeight and maxHeight in your cardview or it's child layout which is Constraint layout to prevent it from expanding on full screen
and if you have long texts to read use ScrollView inside cardview.

As you have set the height of your CardView to wrapContent it will expand to the content that is put in it, what you can do is set app:layout_constrainedHeight="true" that will prevent it from expanding beyond its bounds.
Note that you do have to set up the view bound chaining properly for this to work, ie set app:layout_constraintTop_toX and app:layout_constraintBottom_toX on all the views in the 'chain' from the top of the view through to the bottom.
so in your code:
<androidx.cardview.widget.CardView
android:id="#+id/cv_splash_screen"
style="#style/CardTheme"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="#dimen/card_normal_outer_margin"
android:layout_marginTop="#dimen/card_normal_outer_margin"
android:layout_marginRight="#dimen/card_normal_outer_margin"
android:layout_marginBottom="#dimen/card_normal_outer_margin"
<!-- add this line --> app:layout_constrainedHeight="true"
app:layout_constraintBottom_toTopOf="#id/btn_cta"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="#id/iv_logo">

TextView exceed Constraint if text is too long in ConstraintLayout

I have one TextView aligned to the left and centered vertically. Two groups of ImageView and TextView are both aligned to the right, with two layout configurations, one with image on the right, another with image on the left.
The hello world text can be very long. I want it to expand to fill the whole width without covering up the left text.
I have added app:layout_constraintStart_toEndOf="#id/text1" to constraint the right group (image + text) not to overlap with the left text. However, it does not behave as I expected.
How to make it not overlapping using only ConstraintLayout?
Text1 will be covered up if the right text is too long, which is not expected. Be noted that the image on the second row is gone too.
code:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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="wrap_content">
<androidx.appcompat.widget.AppCompatTextView
android:id="#+id/text1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:text="Text1" />
<androidx.appcompat.widget.AppCompatTextView
android:id="#+id/row1_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintEnd_toStartOf="#id/row1_image"
app:layout_constraintHorizontal_bias="1"
app:layout_constraintHorizontal_chainStyle="packed"
app:layout_constraintStart_toEndOf="#id/text1"
app:layout_constraintTop_toTopOf="parent"
tools:text="Hello World" />
<androidx.appcompat.widget.AppCompatImageView
android:id="#+id/row1_image"
android:layout_width="22dp"
android:layout_height="22dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="#id/row1_text"
app:layout_constraintTop_toTopOf="parent"
tools:src="#drawable/ic_confirm" />
<androidx.constraintlayout.widget.Barrier
android:id="#+id/horizontal_barrier"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:barrierDirection="bottom"
app:constraint_referenced_ids="row1_text,row1_image" />
<androidx.appcompat.widget.AppCompatImageView
android:id="#+id/row2_image"
android:layout_width="22dp"
android:layout_height="22dp"
app:layout_constraintEnd_toStartOf="#id/row2_text"
app:layout_constraintHorizontal_bias="1"
app:layout_constraintHorizontal_chainStyle="packed"
app:layout_constraintStart_toEndOf="#id/text1"
app:layout_constraintTop_toTopOf="#id/horizontal_barrier"
tools:src="#drawable/ic_confirm" />
<androidx.appcompat.widget.AppCompatTextView
android:id="#+id/row2_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="#id/row2_image"
app:layout_constraintTop_toTopOf="#id/horizontal_barrier"
tools:text="Hello World" />
</androidx.constraintlayout.widget.ConstraintLayout>
expected to be like below if the right text is too long. It can achieved by LinearLayout and RelativeLayout

Kindly check the Constraintlayout version. Use app:layout_constrainedWidth="true"
with android:layout_width="wrap_content"

You can use Guidelines to stop your text from expanding more than needed.
let's take this layout for example:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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">
<TextView
android:layout_width="0dp"
android:layout_height="match_parent"
android:gravity="center"
android:text="longgggggg texttttttttttttttttexttttttttttttttttexttttttttttttttttexttttttttttttttt"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="#+id/guideline2"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/textView"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="TextView"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="#+id/guideline2"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<androidx.constraintlayout.widget.Guideline
android:id="#+id/guideline2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_percent="0.18" />
And because of app:layout_constraintGuide_percent="0.18" and android:layout_width="0dp" on both text views the long textView will not exit its constraints.

I had a similar issue, the problem was that I was mixing left and start, so the view was constrained from Right to Left, but the left was set as constraintStartToParent.
Changing everything to start / end solved the issue.

RecyclerView don't clip item in the corner

I want to make recyclerView round corner but seem like if the child item has background color, it will cover to the recyclerView and couldn't be clipped. Here is the design
If I remove the background color of item, then it could be like my design. But unfortunately, sometime it has blue background
Here is what my app show
Here is my item layout
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/item_popover"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="#dimen/dp_8"
android:background="#color/white"
tools:ignore="RtlHardcoded,RtlSymmetry"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto">
<com.jp.base.customView.AppImageView
android:id="#+id/img_notification"
android:paddingRight="#dimen/dp_8"
app:srcCompat="#mipmap/ic_launcher_round"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:layout_marginStart="#dimen/dp_8"
android:layout_marginEnd="#dimen/dp_8"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<android.support.v7.widget.AppCompatImageView
android:id="#+id/img_arrow"
app:srcCompat="#drawable/ic_keyboard_arrow_right_blue_24dp"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<com.jp.base.customView.AppTextView
android:id="#+id/tv_message"
tools:text="Message....\nMessage"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toEndOf="#id/img_notification"
app:layout_constraintEnd_toStartOf="#id/img_arrow"
android:maxLines="5"
android:layout_marginTop="#dimen/dp_5"
android:textColor="#color/black"
android:layout_width="0dp"
android:layout_height="wrap_content" />
<com.jp.base.customView.AppTextView
android:id="#+id/tv_time"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="#dimen/dp_8"
android:drawablePadding="#dimen/dp_8"
android:gravity="center_vertical"
android:textSize="#dimen/text_small"
app:app_leftDrawable="#drawable/ic_access_time_black_24dp"
app:layout_constraintHorizontal_bias="0"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="#+id/img_arrow"
app:layout_constraintStart_toEndOf="#id/img_notification"
app:layout_constraintTop_toBottomOf="#+id/tv_message"
app:layout_constraintVertical_bias="100"
tools:text="a month ago" />
<View
app:layout_constraintTop_toBottomOf="#id/tv_time"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
android:layout_marginTop="#dimen/dp_8"
android:background="#color/gray"
android:layout_width="0dp"
android:layout_height="0.5dp" />
</android.support.constraint.ConstraintLayout>
My RecyclerView:
<android.support.v7.widget.RecyclerView
android:id="#+id/list_notification"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginTop="-30dp"
android:background="#drawable/rect_bound_bottom_5dp"
android:clipChildren="true"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#id/tv_popup_title"
tools:listitem="#layout/item_popover" />

I would try:
Setting "round rect" Outline on the Recycler View - setOutline
This is usually used to provide a shadow effect together with "elevation" but if you don't need a shadow - you can skip the elevation part
Finally call setClipToOutline again on the RecyclerView

Most easy solution will be
Just wrap your RecyclerView inside CardView.
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
tools:cardCornerRadius="50dp"
tools:cardElevation="0dp">
<android.support.v7.widget.RecyclerView
...
/>
</android.support.v7.widget.CardView>
Use cardCorderRadius to change corner radius.

RecyclerView with horizontal LinearLayoutManager automatically distribute margin based on number of children

Is it possible to set a RecyclerView that has width = "match parent" (entire screen). If there are fewer children in the view, distribute them evenly instead of pushing them to the left. Here is the screenshot: I don't want the hourly weather icon in the middle to be pushed to the left. Thanks.
Edit: adding layout files:
<android.support.v7.widget.RecyclerView
android:id="#+id/recyclerview_hourly"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:clipToPadding="false"
android:paddingBottom="8dp"/>
child layout:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
xmlns:app="http://schemas.android.com/apk/res-auto">
<TextView
android:id="#+id/hourly_time"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="#style/TextAppearance.AppCompat.Body1"
android:text="Now"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toTopOf="#+id/hourly_icon" />
<ImageView
android:id="#+id/hourly_icon"
android:layout_width="#dimen/list_icon"
android:layout_height="#dimen/list_icon"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="#+id/hourly_time"
app:layout_constraintBottom_toTopOf="#+id/hourly_temp" />
<TextView
android:id="#+id/hourly_temp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="#style/TextAppearance.AppCompat.Body1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
android:text="45"
app:layout_constraintTop_toBottomOf="#+id/hourly_icon"
app:layout_constraintBottom_toBottomOf="parent" />
</android.support.constraint.ConstraintLayout>