Develop Reference

Can I put a Button to bottom of a ConstraintLayout inside ScrollView?

I have a ScrollView contains a ConstraintLayout. Inside the ConstraintLayout, I put many views with an attribute layout_constraintTop_toBottomOf to make a relation between the view and the view top of it, and I used layout_marginTop to put spaces between the views.
In my design, I have a Button that should be in the bottom of the layout and it cannot happen with the layout_marginTop because it should have a relation with the bottom of the ConstraintLayout.
Here's my code:
<ScrollView 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.support.constraint.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="10dp"
android:paddingBottom="10dp">
<TextView
android:id="#+id/logo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:layout_margin="120dp"
android:text="Logo"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<EditText
android:id="#+id/un_et"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_marginLeft="28dp"
android:layout_marginTop="25dp"
android:layout_marginRight="28dp"
android:gravity="center"
android:hint="User name"
android:textColor="#bebebe"
android:textCursorDrawable="#null"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="#id/logo" />
<EditText
android:id="#+id/pw_et"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_marginLeft="28dp"
android:layout_marginTop="13dp"
android:layout_marginRight="28dp"
android:gravity="center"
android:hint="Password"
android:inputType="textPassword"
android:textColor="#bebebe"
android:textCursorDrawable="#null"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="#id/un_et" />
<RelativeLayout
android:id="#+id/save_pw"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:paddingLeft="28dp"
android:paddingRight="28dp"
app:layout_constraintTop_toBottomOf="#id/pw_et">
<CheckBox
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:buttonTint="#bebebe"
android:text="Save account"
android:textColor="#bebebe" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:text="Forget password?"
android:textColor="#a40000" />
</RelativeLayout>
<Button
android:id="#+id/btn"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_marginLeft="28dp"
android:layout_marginTop="17dp"
android:layout_marginRight="28dp"
android:text="Login"
android:textAllCaps="false"
android:textColor="#FFFFFF"
app:layout_constraintTop_toBottomOf="#id/save_pw" />
<Button
android:id="#+id/btn2"
android:layout_width="match_parent"
android:layout_height="50dp"
android:text="Sign up"
android:textAllCaps="false"
android:textColor="#FFFFFF"
app:layout_constraintTop_toBottomOf="#id/btn" />
</android.support.constraint.ConstraintLayout>
</ScrollView>

Replace ScrollView with NestedScrollView & also add android:fillViewport="true" like this
<androidx.core.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
// rest of code
<Button
android:id="#+id/btn2"
android:layout_width="match_parent"
android:layout_height="50dp"
android:text="Sign up"
android:textAllCaps="false"
android:textColor="#FFFFFF"
app:layout_constraintVertical_bias="1"
app:layout_constraintTop_toBottomOf="#id/btn"
app:layout_constraintBottom_toBottomOf="parent"/>
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.core.widget.NestedScrollView>

Just set this property to your button:
app:layout_constraintBottom_toBottomOf="parent"
Then add this to your last view this property:
app:layout_constraintBottom_toTopOf="#+id/button"
Also, add to your last view:
android:layout_marginBottom="height_of_button"
However, if you are adding a lot of views it would be better to populate them inside a RecyclerView using an Adapter. Decide what you want to do. Also, tell me if I understood your question correctly, it was a bit confusing.

I found one solution to keep the button at the bottom, doesn't matter is your text is dynamic, read about app:layout_constraintVertical_bias https://developer.android.com/reference/androidx/constraintlayout/widget/ConstraintLayout#Bias
<?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"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/text_gallery"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:textAlignment="center"
android:textSize="20sp"
android:text="Title"
app:layout_constraintTop_toTopOf="parent"/>
<androidx.core.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="0dp"
android:fillViewport="true"
app:layout_constraintTop_toBottomOf="#id/text_gallery"
app:layout_constraintBottom_toBottomOf="parent">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:isScrollContainer="true">
<androidx.appcompat.widget.AppCompatTextView
app:layout_constraintTop_toTopOf="parent"
android:id="#+id/texto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="30sp"
android:text=" Text \n Text" />
<androidx.appcompat.widget.AppCompatButton
android:id="#+id/button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Buton1"
app:layout_constraintVertical_bias="1"
app:layout_constraintTop_toBottomOf="#+id/texto"
app:layout_constraintBottom_toBottomOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.core.widget.NestedScrollView>
</androidx.constraintlayout.widget.ConstraintLayout>

ListView under constraint layout disappears in preview

Output png
So below is my xml for the activity:
I have migrated to androidx from support libraries.
Is there a way to achieve this?
<?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"
android:layout_width="match_parent"
android:layout_height="match_parent">
<AutoCompleteTextView
android:id="#+id/partyname"
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="#drawable/rounded_edittext"
android:layout_marginBottom="8dp"
android:layout_marginEnd="5dp"
android:layout_marginStart="5dp"
android:hint="#string/firm_name"
android:padding="5dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toTopOf="parent"/>
<LinearLayout
android:id="#+id/billform"
android:layout_marginTop="5dp"
android:layout_marginRight="5dp"
android:layout_marginEnd="5dp"
android:layout_marginStart="5dp"
android:layout_marginLeft="5dp"
android:layout_width="match_parent"
android:layout_height="0dp"
android:orientation="vertical"
android:background="#drawable/rounded_buttons"
app:layout_constraintTop_toBottomOf="#id/partyname">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<AutoCompleteTextView
android:id="#+id/identifier"
android:layout_height="50dp"
android:layout_width="0dp"
android:padding="5dp"
android:layout_marginEnd="8dp"
android:textSize="16sp"
android:textAllCaps="true"
android:hint="#string/code_article"
android:background="#drawable/rounded_edittext"
android:layout_marginRight="8dp"
android:layout_alignParentStart="true"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:layout_toLeftOf="#+id/add"
android:layout_toStartOf="#+id/add" />
<Button
android:id="#+id/add"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/rounded_buttons"
android:text="#string/add"
android:textAllCaps="true"
android:textSize="18sp"
android:layout_centerVertical="true"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true" />
</RelativeLayout>
</LinearLayout>
<ListView
android:layout_width="match_parent"
android:layout_height="0dp"
app:layout_constraintTop_toBottomOf="#id/billform"
app:layout_constraintBottom_toBottomOf="parent"/>
</androidx.constraintlayout.widget.ConstraintLayout>
For god knows why, the listView is not available in the preview.
It works when the root is linear layout. I tried creating a linear layout within the constraint layout, it didn't work

android:layout_height="0dp"
That might be your problem or if you are talking about not seeing items then it might be a bug in android studio because I tried adding another ConstraintLayout without getting any luck.
This answer might help
I wanted to add my answer as a comment but StackOverflow won't let me.

Try to remove the nested layouts.
Try the below 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="match_parent">
<AutoCompleteTextView
android:id="#+id/partyname"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_marginTop="24dp"
android:padding="5dp"
app:layout_constraintTop_toTopOf="parent"
tools:layout_editor_absoluteX="0dp" />
<AutoCompleteTextView
android:id="#+id/identifier"
android:layout_width="0dp"
android:layout_height="50dp"
android:layout_alignParentStart="true"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:layout_toStartOf="#+id/add"
android:layout_toLeftOf="#+id/add"
android:padding="5dp"
android:textAllCaps="true"
android:textSize="16sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/partyname" />
<Button
android:id="#+id/add"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:text="ADD"
android:textAllCaps="true"
android:textSize="18sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="#+id/identifier" />
<ListView
android:layout_width="match_parent"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toBottomOf="#+id/add" />

change the width from match_parent to 0dp and you can create left and right constraint.The following will work for you.
<ListView
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="#id/billform"
app:layout_constraintBottom_toBottomOf="parent"/>
Update
<?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"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:tools="http://schemas.android.com/tools">
<AutoCompleteTextView
android:id="#+id/partyname"
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="#drawable/rounded_edittext"
android:layout_marginBottom="8dp"
android:layout_marginEnd="5dp"
android:layout_marginStart="5dp"
android:hint="#string/firm_name"
android:padding="5dp"
app:layout_constraintTop_toTopOf="parent"/>
<AutoCompleteTextView
android:id="#+id/identifier"
android:layout_height="50dp"
android:layout_width="0dp"
android:padding="5dp"
android:textSize="16sp"
android:textAllCaps="true"
android:hint="#string/code_article"
android:background="#drawable/rounded_edittext"
android:layout_toStartOf="#+id/add"
app:layout_constraintEnd_toStartOf="#+id/add"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#id/partyname"/>
<Button
android:id="#+id/add"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:background="#drawable/rounded_buttons"
android:text="#string/add"
android:textAllCaps="true"
android:textSize="18sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="#+id/partyname"/>
<ListView
android:layout_width="0dp"
android:layout_height="0dp"
tools:listitem="Add items here"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="#id/add"
app:layout_constraintBottom_toBottomOf="parent"/>
</androidx.constraintlayout.widget.ConstraintLayout>

ConstraintLayout TextView cutting text off

I have a strange problem where the text in a TextView is not being displayed if it's wrapping to a new line.
This screenshot shows my issue:
The bold text is causing a word to wrap to the next line but it's not being shown. This is what it looks like without the bold:
And this is what it looks like if I force two lines using android:lines="2":
This is the code I'm using:
<?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"
android:id="#+id/episode_row_item_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:padding="5dp"
android:foreground="?android:attr/selectableItemBackground"
android:orientation="horizontal">
<ImageView
android:id="#+id/episode_row_item_title_thumbnail"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:adjustViewBounds="true"
android:scaleType="fitCenter"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:visibility="gone"
/>
<!-- This is the problematic textview-->
<TextView
android:id="#+id/episode_row_item_title"
android:layout_width="0dp"
android:layout_height="match_parent"
android:lineSpacingExtra="2dp"
android:layout_marginEnd="8dp"
android:breakStrategy="simple"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toStartOf="#+id/episode_row_item_download"
android:foreground="?android:attr/selectableItemBackground"
/>
<ImageView
android:id="#+id/episode_row_item_download"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="2dp"
app:layout_constraintTop_toTopOf="#+id/episode_row_item_title"
app:layout_constraintEnd_toEndOf="parent"
android:foreground="?android:attr/selectableItemBackground"
/>
<TextView
android:id="#+id/episode_row_item_date"
android:layout_width="0dp"
android:layout_height="match_parent"
android:textSize="13sp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/episode_row_item_title"
app:layout_constraintEnd_toStartOf="#+id/episode_row_item_duration"
android:layout_marginTop="4dp"
/>
<TextView
android:id="#+id/episode_row_item_duration"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="13sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="#+id/episode_row_item_title"
android:layout_marginTop="4dp"
/>
</androidx.constraintlayout.widget.ConstraintLayout>
I've tried setting the width to wrap_content and changing the padding and margins but nothing works.
I should mention this layout is a row in a RecyclerView if that makes a difference.

<?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"
android:id="#+id/episode_row_item_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="5dp"
android:foreground="?android:attr/selectableItemBackground">
<ImageView
android:id="#+id/episode_row_item_title_thumbnail"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:adjustViewBounds="true"
android:scaleType="fitCenter"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:visibility="visible"
/>
<!-- This is the problematic textview-->
<TextView
android:id="#+id/episode_row_item_title"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:lineSpacingExtra="2dp"
android:layout_marginEnd="8dp"
android:textStyle="bold"
android:text="Episode 1010 Christina Hendericks"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#id/episode_row_item_title_thumbnail"
app:layout_constraintEnd_toStartOf="#+id/episode_row_item_download"
android:foreground="?android:attr/selectableItemBackground"
android:layout_marginRight="8dp"/>
<ImageView
android:id="#+id/episode_row_item_download"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="2dp"
app:layout_constraintTop_toTopOf="#+id/episode_row_item_title"
app:layout_constraintEnd_toEndOf="parent"
android:foreground="?android:attr/selectableItemBackground"
/>
<TextView
android:id="#+id/episode_row_item_date"
android:layout_width="0dp"
android:layout_height="match_parent"
android:textSize="13sp"
app:layout_constraintStart_toStartOf="parent"
android:text="Yesterday"
app:layout_constraintTop_toBottomOf="#+id/episode_row_item_title"
app:layout_constraintEnd_toStartOf="#+id/episode_row_item_duration"
android:layout_marginTop="4dp"/>
<TextView
android:id="#+id/episode_row_item_duration"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="13sp"
android:text="01:02:24"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="#+id/episode_row_item_download"
android:layout_marginTop="4dp"/>
</androidx.constraintlayout.widget.ConstraintLayout>
Try using the above layout with correct drawables

ListView inside nested ConstraintLayouts is not Scrolling

This is my first question on Stack-overflow.
My layout needs a List View at the bottom of the screen. The full layout is designed in Constraint Layout. The List View is also put inside a Constraint Layout. However, it is not scrolling.
It is a code that has come for rectification hence I cannot do much of modifications to make List View work.
Some may think this is a duplicate question but there is just 1 or 2 answers on List View with constraint layout and that solutions too didn't help. I have searched a lot but nothing works.
Any help is welcome.
<android.support.constraint.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.constraint.ConstraintLayout
android:id="#+id/cl_recent_memos_top_heading"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.constraint.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/gray">
<ImageView
android:id="#+id/img_recent_memos_top_heading_bar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="#dimen/space_10"
android:layout_marginLeft="#dimen/space_10"
android:layout_marginTop="#dimen/space_10"
android:src="#drawable/applied_leaves_top"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/tv_recent_top_heading_bar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="#dimen/space_10"
android:layout_marginLeft="#dimen/space_10"
android:layout_marginTop="#dimen/space_10"
android:fontFamily="serif"
android:text="#string/recent"
android:textColor="#color/dark_gray"
android:textSize="#dimen/top_heading_first_label_text_size"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toRightOf="#id/img_recent_memos_top_heading_bar"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/tv_memos_top_heading_bar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="#dimen/space_10"
android:layout_marginLeft="#dimen/space_10"
android:layout_marginTop="#dimen/space_13"
android:fontFamily="serif"
android:text="#string/memos"
android:textColor="#c5c5c5"
android:textSize="#dimen/top_heading_first_second_text_size"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toRightOf="#id/tv_recent_top_heading_bar"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
</android.support.constraint.ConstraintLayout>
<android.support.constraint.ConstraintLayout
android:id="#+id/cl_recent_memos_grid"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="0dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="#id/cl_recent_memos_top_heading">
<android.support.constraint.ConstraintLayout
android:id="#+id/cl_recent_memos_grid_header"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="#dimen/space_5"
app:layout_constraintLeft_toLeftOf="parent">
<android.support.constraint.ConstraintLayout
android:id="#+id/cl_container_header"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.constraint.ConstraintLayout
android:id="#+id/cl_memo"
android:layout_width="180dp"
android:layout_height="wrap_content"
android:layout_marginLeft="#dimen/space_1"
android:background="#31cbe5"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toTopOf="parent">
<TextView
android:id="#+id/tv_memo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:fontFamily="serif"
android:paddingLeft="#dimen/space_3"
android:text="#string/memo"
android:textColor="#color/white"
android:textSize="#dimen/show_applied_leave_grid_header_label_text_size"
app:layout_constraintLeft_toLeftOf="parent" />
</android.support.constraint.ConstraintLayout>
<android.support.constraint.ConstraintLayout
android:id="#+id/cl_memo_date"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:layout_marginLeft="#dimen/space_1"
android:background="#31cbe5"
app:layout_constraintLeft_toRightOf="#id/cl_memo">
<TextView
android:id="#+id/tv_memo_date"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:fontFamily="serif"
android:paddingLeft="#dimen/space_3"
android:text="#string/memo_date"
android:textColor="#color/white"
android:textSize="#dimen/show_applied_leave_grid_header_label_text_size" />
</android.support.constraint.ConstraintLayout>
<!-- To -->
<android.support.constraint.ConstraintLayout
android:id="#+id/cl_document"
android:layout_width="140dp"
android:layout_height="wrap_content"
android:layout_marginLeft="#dimen/space_1"
android:background="#31cbe5"
android:paddingLeft="#dimen/space_3"
app:layout_constraintLeft_toRightOf="#id/cl_memo_date">
<TextView
android:id="#+id/tv_document"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:fontFamily="serif"
android:text="#string/document"
android:textColor="#color/white"
android:textSize="#dimen/show_applied_leave_grid_header_label_text_size" />
</android.support.constraint.ConstraintLayout>
<!-- Edit -->
<android.support.constraint.ConstraintLayout
android:id="#+id/cl_edit"
android:layout_width="50dp"
android:layout_height="wrap_content"
android:layout_marginLeft="#dimen/space_1"
android:background="#31cbe5"
app:layout_constraintLeft_toRightOf="#+id/cl_document">
<TextView
android:id="#+id/tv_edit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/edit"
android:textColor="#fff"
android:textSize="#dimen/show_applied_leave_grid_header_label_text_size" />
</android.support.constraint.ConstraintLayout>
<!-- Delete -->
<android.support.constraint.ConstraintLayout
android:id="#+id/cl_delete"
android:layout_width="50dp"
android:layout_height="wrap_content"
android:layout_marginLeft="#dimen/space_1"
android:background="#31cbe5"
app:layout_constraintLeft_toRightOf="#+id/cl_edit">
<TextView
android:id="#+id/tv_delete"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/delete"
android:textColor="#fff"
android:textSize="#dimen/show_applied_leave_grid_header_label_text_size" />
</android.support.constraint.ConstraintLayout>
</android.support.constraint.ConstraintLayout>
</android.support.constraint.ConstraintLayout>
<android.support.constraint.ConstraintLayout
android:id="#+id/cl_recent_memo_list"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_marginLeft="#dimen/space_5"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toBottomOf="#id/cl_recent_memos_grid_header">
<ListView
android:id="#+id/lv_recent_memos"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:divider="#android:color/transparent"
android:fadeScrollbars="false" />
</android.support.constraint.ConstraintLayout>
</android.support.constraint.ConstraintLayout>
</android.support.constraint.ConstraintLayout>
</android.support.constraint.ConstraintLayout>

I had the same problem where my ListView did not scroll inside a ConstraintLayout. For me, the solution was setting the ListView to android:layout_height="0dp" with top and bottom constraints.
Example
<ListView
android:layout_width="match_parent"
android:layout_height="0dp"
app:layout_constraintTop_toBottomOf="#id/cl_recent_memos_grid_header"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
>
</ListView>

Change RecyclerView CardView background to transparent

Problem Short Version:
I want to make my CardView and RecyclerView background transparent, so
the fragment/activity background should become visible.
Explained:
I have an activity A with background image and fragment B is replaced on its Framelayout , in Fragment B i have recyclerView which with CardView now problem is i want to make every background transparent so only CardView will be visible with actual background of activity
RecyclerView look like this(These white background should be transparent) :
Code
Activity(A)
<?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:id="#+id/fl"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#android:color/transparent"
android:backgroundTint="#android:color/transparent"/>
Fragment(B) RecyclerView
<android.support.design.widget.CoordinatorLayout 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:backgroundTint="#android:color/transparent"
android:background="#android:color/transparent">
<android.support.v7.widget.RecyclerView
android:id="#+id/rv"
tools:listitem="#layout/layout_video_item"
android:backgroundTint="#android:color/transparent"
android:background="#android:color/transparent"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<TextView
android:id="#+id/tv_not_found"
android:text="No Media Found Yet"
android:layout_gravity="center"
android:gravity="center"
android:visibility="gone"
android:textAppearance="#style/TextAppearance.AppCompat.Large"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</android.support.design.widget.CoordinatorLayout>
CardView / Item layout
<?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="wrap_content"
android:layout_marginEnd="3dp"
android:layout_marginStart="3dp"
android:layout_marginTop="3dp"
android:background="#android:color/transparent">
<android.support.v7.widget.CardView
style="#style/CardView.Light"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:cardUseCompatPadding="true"
android:background="#android:color/transparent"
android:backgroundTint="#android:color/transparent"
app:cardCornerRadius="5dp"
android:padding="0dp"
app:cardElevation="0dp"
tools:ignore="ContentDescription">
<android.support.constraint.ConstraintLayout xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="0dp"
android:background="#color/colorAccent">
<ImageView
android:id="#+id/media_image"
android:layout_width="100dp"
android:layout_height="0dp"
android:scaleType="centerCrop"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="#android:color/darker_gray" />
<ImageButton
android:id="#+id/ib_delete"
android:layout_width="30dp"
android:layout_height="40dp"
android:background="#00FFFFFF"
android:padding="12dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:srcCompat="#drawable/ic_delete_white_24dp" />
<ImageButton
android:id="#+id/share_button"
android:layout_width="30dp"
android:layout_height="40dp"
android:background="#00FFFFFF"
android:padding="12dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="#+id/ib_delete"
app:srcCompat="#drawable/ic_share_white_24dp" />
<TextView
android:id="#+id/tv_video_name"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="5dp"
android:ellipsize="marquee"
android:singleLine="true"
android:text="Title Test"
android:textAppearance="#style/TextAppearance.AppCompat.Large.Inverse"
android:textColor="#color/colorPrimaryText"
app:layout_constraintEnd_toStartOf="#+id/tv_ribbon"
app:layout_constraintStart_toEndOf="#+id/media_image"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/tv_ribbon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#android:color/holo_red_light"
android:ellipsize="marquee"
android:fontFamily="monospace"
android:padding="3dp"
android:singleLine="true"
android:text="New"
android:textColor="#color/colorIcons"
android:textSize="14sp"
android:visibility="gone"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/tv_path"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginStart="5dp"
android:ellipsize="marquee"
android:singleLine="true"
android:text="subtitle test"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="#+id/media_image"
app:layout_constraintTop_toBottomOf="#+id/tv_video_name" />
<ImageView
android:id="#+id/iv_is_audio"
android:layout_width="25dp"
android:layout_height="25dp"
android:layout_marginBottom="8dp"
android:layout_marginStart="5dp"
android:layout_marginTop="8dp"
android:visibility="invisible"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toEndOf="#+id/media_image"
app:layout_constraintTop_toBottomOf="#+id/tv_duration"
app:srcCompat="#drawable/ic_settings_voice_black_24dp" />
<ImageView
android:id="#+id/iv_is_video"
android:layout_width="25dp"
android:layout_height="25dp"
android:layout_marginStart="5dp"
android:visibility="invisible"
app:layout_constraintBottom_toBottomOf="#+id/iv_is_audio"
app:layout_constraintStart_toEndOf="#+id/iv_is_audio"
app:layout_constraintTop_toTopOf="#+id/iv_is_audio"
app:srcCompat="#drawable/ic_theaters" />
<ImageView
android:id="#+id/iv_is_gif"
android:layout_width="35dp"
android:layout_height="30dp"
android:layout_marginStart="5dp"
android:visibility="invisible"
app:layout_constraintBottom_toBottomOf="#+id/iv_is_video"
app:layout_constraintStart_toEndOf="#+id/iv_is_video"
app:layout_constraintTop_toTopOf="#+id/iv_is_video"
app:srcCompat="#drawable/ic_gif" />
<TextView
android:id="#+id/tv_duration"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="5dp"
android:layout_marginTop="8dp"
android:text="0:00"
app:layout_constraintStart_toEndOf="#+id/media_image"
app:layout_constraintTop_toBottomOf="#+id/tv_path" />
<TextView
android:id="#+id/tv_size"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:text="0 MB"
app:layout_constraintBottom_toBottomOf="#+id/tv_duration"
app:layout_constraintStart_toEndOf="#+id/tv_duration"
app:layout_constraintTop_toTopOf="#+id/tv_duration" />
</android.support.constraint.ConstraintLayout>
</android.support.v7.widget.CardView>
</RelativeLayout>
Reason for asking question:
I know there are lots of SO question out there to get this same task done but my requirements are little different and reason for asking this question is nothing is working for me.
Expectation

Set CardView Background to app:cardBackgroundColor="#00ffffff"