Constraint layout's Horizontal orientation not working - android

I've 3 views, Text view, a vertical divider and switch in order with chaining as spread inside now I'm trying to move vertical divider from current center towards switch by setting horizontal_bias to .8, but in horizontal_bias does not get honored, How to move vertical divider towards switch in ContraintLayout, below is the layout 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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivityFragment"
tools:showIn="#layout/activity_main">
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="16dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:layout_marginBottom="8dp"
android:text="TextView"
app:layout_constraintBottom_toTopOf="#+id/divider"
app:layout_constraintEnd_toStartOf="#+id/divider2"
app:layout_constraintHorizontal_chainStyle="spread_inside"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<View
android:id="#+id/divider2"
android:layout_width="4dp"
android:layout_height="0dp"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:layout_marginBottom="8dp"
android:background="?android:attr/listDivider"
app:layout_constraintBottom_toTopOf="#+id/divider"
app:layout_constraintEnd_toStartOf="#+id/switch1"
app:layout_constraintHorizontal_bias="0.8"
app:layout_constraintHorizontal_chainStyle="spread"
app:layout_constraintStart_toEndOf="#+id/textView"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.0" />
<android.support.v7.widget.SwitchCompat
android:id="#+id/switch1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:layout_marginBottom="8dp"
android:checked="true"
app:layout_constraintBottom_toTopOf="#+id/divider"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_chainStyle="spread"
app:layout_constraintStart_toEndOf="#+id/divider2"
app:layout_constraintTop_toTopOf="parent" />
<View
android:id="#+id/divider"
android:layout_width="368dp"
android:layout_height="1dp"
android:layout_marginTop="8dp"
android:background="?android:attr/listDivider"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/textView" />
</android.support.constraint.ConstraintLayout>


If it will work in your implementation, try simply removing the view chaining then set the horizontal bias on the divider.
<?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=".MainActivityFragment"
tools:showIn="#layout/activity_main">
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="14dp"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="16dp"
android:text="TextView"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<View
android:id="#+id/divider2"
android:layout_width="4dp"
android:layout_height="0dp"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:layout_marginBottom="8dp"
android:background="?android:attr/listDivider"
app:layout_constraintBottom_toTopOf="#+id/divider"
app:layout_constraintEnd_toStartOf="#+id/switch1"
app:layout_constraintHorizontal_bias="0.75"
app:layout_constraintStart_toEndOf="#+id/textView"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.0" />
<android.support.v7.widget.SwitchCompat
android:id="#+id/switch1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:layout_marginBottom="8dp"
android:checked="true"
app:layout_constraintBottom_toTopOf="#+id/divider"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<View
android:id="#+id/divider"
android:layout_width="368dp"
android:layout_height="1dp"
android:layout_marginTop="8dp"
android:background="?android:attr/listDivider"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/textView" />
</android.support.constraint.ConstraintLayout>

Related

Constraint Layout shifted down over screen edge

I've been using Constraint Layouts for a while but today I faced a strange problem, all my layouts that contain constraint layouts are shifted down over the lower screen edge although the width and height of the parent constraint layout are (match-parent), the result is below
and here's is the XML code for the layout
<?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"
android:background="#color/colorPrimary"
tools:context=".Setup_SettingsActivity">
<android.support.design.widget.TextInputLayout
android:id="#+id/setup_pharmacy_name"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="60dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/textView5">
<android.support.design.widget.TextInputEditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="#string/setup_pharmacy_name" />
</android.support.design.widget.TextInputLayout>
<TextView
android:id="#+id/textView5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="68dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:text="#string/setup_welcome"
android:textColor="#color/common_google_signin_btn_text_dark_default"
android:textSize="24sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<android.support.design.widget.TextInputLayout
android:id="#+id/setup_pharmacy_address"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/setup_pharmacy_name">
<android.support.design.widget.TextInputEditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="#string/setup_pharmacy_address"
android:inputType="textMultiLine" />
</android.support.design.widget.TextInputLayout>
<Button
android:id="#+id/setup_save_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="84dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:backgroundTint="#color/colorAccent"
android:text="#string/setup_save_btn_text"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/setup_has_delivery_switch" />
<Switch
android:id="#+id/setup_has_delivery_switch"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:layout_marginTop="16dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:text="#string/setup_has_delivery_switch_text"
android:textColor="#color/common_google_signin_btn_text_dark_default"
android:textOff="#string/setup_delivery_switch_off"
android:textOn="#string/setup_delivery_switch_on"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/divider" />
<ImageButton
android:id="#+id/imageButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="36dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:backgroundTint="#color/colorAccent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.476"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/setup_pharmacy_address"
app:srcCompat="#mipmap/position_btn" />
<ImageView
android:id="#+id/imageView2"
android:layout_width="42dp"
android:layout_height="38dp"
android:layout_marginStart="20dp"
android:layout_marginLeft="20dp"
android:layout_marginTop="52dp"
android:visibility="invisible"
app:layout_constraintStart_toEndOf="#+id/imageButton"
app:layout_constraintTop_toBottomOf="#+id/setup_pharmacy_address"
app:srcCompat="#mipmap/position_done" />
<TextView
android:id="#+id/textView6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="24dp"
android:layout_marginLeft="24dp"
android:layout_marginTop="60dp"
android:layout_marginEnd="12dp"
android:layout_marginRight="12dp"
android:text="#string/setup_record_position_text"
android:textColor="#color/common_google_signin_btn_text_dark_default"
android:textSize="12sp"
app:layout_constraintEnd_toStartOf="#+id/imageButton"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/setup_pharmacy_address" />
<View
android:id="#+id/divider"
android:layout_width="0dp"
android:layout_height="1dp"
android:layout_marginTop="40dp"
android:background="#color/divider"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/imageButton" />
<View
android:id="#+id/divider2"
android:layout_width="0dp"
android:layout_height="1dp"
android:layout_marginTop="20dp"
android:background="#color/divider"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/setup_has_delivery_switch" />
</android.support.constraint.ConstraintLayout>
what might be the cause of this problem?

Your layout got pushed down because you are using way too large margins - you are using constraintLayout but you are also using large fixed size for your margins (android:layout_marginTop="60dp" for example) and because different phones got different screen size, when you are using a fixed size on your view you are making your layout less responsive(small margins are ok but the problem starts with the large margins).
If you want to place some view somewhere at your screen I would recommend using guielines and constraint your views into the guideline rather then give your view a lot of margins.
You can simply use chains to achieve your desired layout.
Here is an example of the layout that you want to achieve using cnostraintLayout and chains:
<?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">
<android.support.design.widget.TextInputLayout
android:id="#+id/setup_pharmacy_name"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginEnd="8dp"
app:layout_constraintBottom_toTopOf="#+id/setup_pharmacy_address"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/textView5">
<android.support.design.widget.TextInputEditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="setup_pharmacy_name" />
</android.support.design.widget.TextInputLayout>
<TextView
android:id="#+id/textView5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginEnd="8dp"
android:text="setup_welcome"
android:textColor="#color/common_google_signin_btn_text_dark_default"
android:textSize="24sp"
app:layout_constraintBottom_toTopOf="#+id/setup_pharmacy_name"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<android.support.design.widget.TextInputLayout
android:id="#+id/setup_pharmacy_address"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginEnd="8dp"
app:layout_constraintBottom_toTopOf="#+id/textView6"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/setup_pharmacy_name">
<android.support.design.widget.TextInputEditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="setup_pharmacy_address"
android:inputType="textMultiLine" />
</android.support.design.widget.TextInputLayout>
<Button
android:id="#+id/setup_save_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginEnd="8dp"
android:backgroundTint="#color/colorAccent"
android:text="setup_save_btn_text"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/divider2" />
<Switch
android:id="#+id/setup_has_delivery_switch"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginEnd="8dp"
android:text="setup_has_delivery_switch_text"
android:textColor="#color/common_google_signin_btn_text_dark_default"
android:textOff="setup_delivery_switch_off"
android:textOn="setup_delivery_switch_on"
app:layout_constraintBottom_toTopOf="#+id/divider2"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/divider" />
<ImageButton
android:id="#+id/imageButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:backgroundTint="#color/colorAccent"
app:layout_constraintBottom_toBottomOf="#+id/textView6"
app:layout_constraintEnd_toStartOf="#+id/imageView2"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toEndOf="#+id/textView6"
app:layout_constraintTop_toTopOf="#+id/textView6"
app:srcCompat="position_btn" />
<ImageView
android:id="#+id/imageView2"
android:layout_width="42dp"
android:layout_height="38dp"
android:src="#drawable/new_question"
android:visibility="invisible"
app:layout_constraintBottom_toBottomOf="#+id/textView6"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toEndOf="#+id/imageButton"
app:layout_constraintTop_toTopOf="#+id/textView6" />
<TextView
android:id="#+id/textView6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="setup_record_position_text"
android:textColor="#color/common_google_signin_btn_text_dark_default"
android:textSize="12sp"
app:layout_constraintBottom_toTopOf="#+id/divider"
app:layout_constraintEnd_toStartOf="#+id/imageButton"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/setup_pharmacy_address" />
<View
android:id="#+id/divider"
android:layout_width="0dp"
android:layout_height="1dp"
android:layout_marginEnd="8dp"
android:background=""
app:layout_constraintBottom_toTopOf="#+id/setup_has_delivery_switch"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/textView6" />
<View
android:id="#+id/divider2"
android:layout_width="0dp"
android:layout_height="1dp"
android:layout_marginEnd="8dp"
app:layout_constraintBottom_toTopOf="#+id/setup_save_btn"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/setup_has_delivery_switch" />
</android.support.constraint.ConstraintLayout>
And it will look like this:

It's depend upon screen size.Sometime our layout is optimial for medium or large screen size device which cause issue to small device. In order to fix this issue for smaller device too, add ScrollView as parent layout of constraint layout
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true">
<android.support.constraint.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
....
</android.support.constraint.ConstraintLayout>
</ScrollView>

RecyclerView in ConstraintLayout is not showing properly

I tested this xml with chaining, Guideline and Barrier but none of them could help.
The xml code:
<?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=".RatingActivity">
<TextView
android:id="#+id/welcomeTextView"
android:layout_width="0dp"
android:layout_height="74dp"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:layout_marginBottom="79dp"
android:gravity="clip_vertical|center_horizontal"
android:text="#string/welcome"
android:textAppearance="#style/TextAppearance.AppCompat.Medium"
android:textStyle="bold"
app:layout_constraintBottom_toTopOf="#+id/recyclerView"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.0" />
<android.support.v7.widget.RecyclerView
android:id="#+id/recyclerView"
android:layout_width="0dp"
android:layout_height="467dp"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:layout_marginBottom="24dp"
android:background="#android:color/darker_gray"
android:padding="4dp"
android:scrollbars="vertical"
app:layout_constraintBottom_toTopOf="#+id/submitButton"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent" />
<Button
android:id="#+id/submitButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:layout_marginBottom="8dp"
android:text="#string/submit"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
</android.support.constraint.ConstraintLayout>
When it runs on an AVD, the RecyclerView takes more space than what is needed causing it to cover or push back either welcomeTextView or submitButton.
BTW, this is the Gradle dependency:
implementation 'com.android.support.constraint:constraint-layout:1.1.3'

Try:
<?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">
<TextView
android:id="#+id/welcomeTextView"
android:layout_width="0dp"
android:layout_height="74dp"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:layout_marginBottom="79dp"
android:gravity="clip_vertical|center_horizontal"
android:text="welcome"
android:textAppearance="#style/TextAppearance.AppCompat.Medium"
android:textStyle="bold"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.0" />
<android.support.v7.widget.RecyclerView
android:id="#+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:layout_marginBottom="24dp"
android:background="#android:color/darker_gray"
android:padding="4dp"
android:scrollbars="vertical"
app:layout_constrainedHeight="true"
app:layout_constraintTop_toBottomOf="#+id/welcomeTextView"
app:layout_constraintBottom_toTopOf="#id/submitButton" />
<Button
android:id="#+id/submitButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:layout_marginBottom="8dp"
android:text="submit"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
</android.support.constraint.ConstraintLayout>
The only change is set the top of your RecyclerView instead the bottom of your text, and then set the RecyclerView height to 0 and set the app:layout_constrainedHeight="true" to enable the height calculation based on constraints. If the welcome message bottom margin doesn't work, try to set a top margin to the RecyclerView.

Constraint Layout not matching Scroll View height

I've put inside a constraint layout a image and a heading layout which is not supposed to scroll and a scroll view which contains another constraint layout with some views. When I try to resize the constraint layout inside scroll view, The width changes accordingly, however the height not. I'd like the constraint layout height to match the height of its scrollview as I intend to add more text boxes and buttons for a registration form. Right now the two boxes are squeezed and the constraint layout height is not increasing.
<?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="#color/MistyRose"
android:orientation="vertical"
android:paddingLeft="16dp"
android:paddingTop="16dp"
android:paddingRight="16dp"
android:paddingBottom="16dp">
<ImageView
android:id="#+id/imageView2"
android:layout_width="203dp"
android:layout_height="95dp"
android:layout_marginStart="8dp"
android:layout_marginTop="32dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:src="#drawable/logo"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.497"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.0" />
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="70dp"
android:layout_marginStart="8dp"
android:layout_marginTop="32dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:text="Register"
android:textColor="#color/Black"
android:textSize="40dp"
android:textStyle="italic"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/imageView2"
app:layout_constraintVertical_bias="0.016" />
<ScrollView
android:id="#+id/scrollView2"
android:layout_width="400dp"
android:layout_height="250dp"
android:layout_marginStart="8dp"
android:layout_marginTop="32dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.6"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/textView"
app:layout_constraintVertical_bias="0.0">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal">
<EditText
android:layout_width="350dp"
android:layout_height="46dp"
android:layout_marginStart="8dp"
android:layout_marginEnd="8dp"
android:background="#drawable/edittext"
android:hint="Name"
android:inputType="text"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
tools:layout_editor_absoluteY="12dp" />
<EditText
android:layout_width="350dp"
android:layout_height="46dp"
android:layout_marginStart="16dp"
android:layout_marginTop="16dp"
android:background="#drawable/edittext"
android:hint="Email"
android:inputType="textEmailAddress"
/>
</androidx.constraintlayout.widget.ConstraintLayout>
</ScrollView>
</androidx.constraintlayout.widget.ConstraintLayout>

You should put some constraints to your views in the container of the scroll view and make the scrollview stretch its content to fill the viewport with android:fillViewport="true"
Code here:
<?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="#color/MistyRose"
android:orientation="vertical"
android:paddingLeft="16dp"
android:paddingTop="16dp"
android:paddingRight="16dp"
android:paddingBottom="16dp">
<ImageView
android:id="#+id/imageView2"
android:layout_width="203dp"
android:layout_height="95dp"
android:layout_marginStart="8dp"
android:layout_marginTop="32dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:src="#drawable/logo"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.497"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.0" />
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="70dp"
android:layout_marginStart="8dp"
android:layout_marginTop="32dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:text="Register"
android:textColor="#color/Black"
android:textSize="40dp"
android:textStyle="italic"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/imageView2"
app:layout_constraintVertical_bias="0.016" />
<ScrollView
android:id="#+id/scrollView2"
android:layout_width="400dp"
android:layout_height="250dp"
android:layout_marginStart="8dp"
android:layout_marginTop="32dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.6"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/textView"
app:layout_constraintVertical_bias="0.0" android:fillViewport="true">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal">
<EditText
android:layout_width="350dp"
android:layout_height="46dp"
android:layout_marginStart="8dp"
android:background="#drawable/edittext"
android:hint="Name"
android:inputType="text"
app:layout_constraintStart_toStartOf="parent"
android:layout_marginTop="8dp" app:layout_constraintTop_toTopOf="parent"
android:id="#+id/editText" android:layout_marginEnd="8dp"
app:layout_constraintEnd_toEndOf="parent"/>
<EditText
android:layout_width="350dp"
android:layout_height="46dp"
android:background="#drawable/edittext"
android:hint="Email"
android:inputType="textEmailAddress"
android:layout_marginTop="8dp"
app:layout_constraintTop_toBottomOf="#+id/editText" android:layout_marginStart="8dp"
app:layout_constraintStart_toStartOf="parent" android:layout_marginEnd="8dp"
app:layout_constraintEnd_toEndOf="parent"/>
</androidx.constraintlayout.widget.ConstraintLayout>
</ScrollView>
</androidx.constraintlayout.widget.ConstraintLayout>

Android Studio Nesting ScrollView in a Constraint Layout

I am new to android studio and have been messing around with this layout for the last hour or two. I want the whole screen to be able to scroll.
<?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">
<android.support.constraint.ConstraintLayout
android:id="#+id/constraintLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="0dp"
android:layout_marginBottom="16dp"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:background="#color/colorPrimaryDark"
android:padding="40dp"
app:layout_constraintBottom_toTopOf="#+id/emailEditText"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<TextView
android:id="#+id/welcomeTextView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="24dp"
android:text="#string/welcome_text"
android:textColor="#fff"
android:textSize="23dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/imageView" />
<TextView
android:id="#+id/introTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="16dp"
android:text="#string/intro_text"
android:textColor="#fff"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/welcomeTextView" />
<Button
android:id="#+id/learnMoreButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="16dp"
android:background="#drawable/pink_button"
android:text="#string/learn_more_button"
android:textColor="#fff"
app:layout_constraintEnd_toStartOf="#+id/signUpButton"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/introTextView" />
<Button
android:id="#+id/signUpButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/navy_button"
android:text="#string/sign_up_button"
android:textColor="#fff"
app:layout_constraintBaseline_toBaselineOf="#+id/learnMoreButton"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toEndOf="#+id/learnMoreButton" />
<ImageView
android:id="#+id/imageView"
android:layout_width="89dp"
android:layout_height="74dp"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="#drawable/logo" />
</android.support.constraint.ConstraintLayout>
<EditText
android:id="#+id/emailEditText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="16dp"
android:drawableLeft="#drawable/ic_person_outline_black_24dp"
android:drawablePadding="10dp"
android:ems="10"
android:hint="#string/enter_email"
android:inputType="textEmailAddress"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/constraintLayout" />
<EditText
android:id="#+id/passwordEditText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:drawableLeft="#drawable/ic_lock_outline_black_24dp"
android:drawablePadding="10dp"
android:ems="10"
android:hint="#string/enter_password"
android:inputType="textPassword"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/emailEditText" />
<Button
android:id="#+id/signInButton"
android:layout_width="220dp"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="16dp"
android:background="#drawable/pink_button"
android:text="#string/sign_in_button"
android:textColor="#fff"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/passwordEditText" />
<TextView
android:id="#+id/orTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="16dp"
android:text="#string/or"
android:textColor="#color/colorPrimary"
app:layout_constraintBottom_toTopOf="#+id/fbSignInButton"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/signInButton" />
<Button
android:id="#+id/fbSignInButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="14dp"
android:background="#drawable/pink_button"
android:text="#string/fb_button"
android:textColor="#fff"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/orTextView" />
</android.support.constraint.ConstraintLayout>
I have tried putting the scrollview nested inside the main constraint layout and I have also changed the layout to a Scrollview layout and nested a Constraint layout which I also could not get to work. Can someone explain where I am going wrong?

As scrollview is only capable of handling a single view, I would suggest you to wrap everything within a Linear Layout
Use the following code:
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
//PUT ALL OF YOUR ELEMENTS IN HERE
//STARTING WITH...
<android.support.constraint.ConstraintLayout
android:id="#+id/constraintLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="0dp"
android:layout_marginBottom="16dp"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:background="#color/colorPrimaryDark"
android:padding="40dp"
app:layout_constraintBottom_toTopOf="#+id/emailEditText"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
..............REMAINING ELEMENTS.............
//AND ENDING WITH
<Button
android:id="#+id/fbSignInButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="14dp"
android:background="#drawable/pink_button"
android:text="#string/fb_button"
android:textColor="#fff"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/orTextView" />
</LinearLayout>
</ScrollView>

horizontal line with text in middle with ConstraintLayout

I'm trying to achieve the same result as in:
Android : horizontal line with text in middle
but using ConstraintLayout.
No matter what I tried, I can't make the text and the 2 views to be aligned vertically.
I'm not sure if it's because I'm not setting a specific width to the dividers views, but I don't see any other way to let the views take all the free space.
Here's my test layout sample:
<?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">
<View
android:id="#+id/right_divider"
android:layout_width="0dp"
android:layout_height="1dp"
android:layout_marginBottom="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
app:layout_constraintBottom_toBottomOf="#+id/text"
app:layout_constraintEnd_toStartOf="#+id/text"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintHorizontal_chainStyle="spread"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/button5"
app:layout_constraintVertical_bias="0.975"/>
<TextView
android:id="#+id/text"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:text="Button"
app:layout_constraintEnd_toStartOf="#+id/left_divider"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toEndOf="#+id/right_divider"
app:layout_constraintTop_toBottomOf="#+id/button5"/>
<View
android:id="#+id/left_divider"
android:layout_width="0dp"
android:layout_height="1dp"
android:layout_marginEnd="8dp"
android:layout_marginTop="8dp"
app:layout_constraintBottom_toBottomOf="#+id/text"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toEndOf="#+id/text"
app:layout_constraintTop_toBottomOf="#+id/button5"
app:layout_constraintVertical_bias="0.946"/>
<Button
android:id="#+id/button5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:text="Button"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"/>
</android.support.constraint.ConstraintLayout>"
android:layout_marginTop="8dp"
android:text="Button"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"/>
</android.support.constraint.ConstraintLayout>

try below code
<?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">
<View
android:id="#+id/right_divider"
android:layout_width="0dp"
android:layout_height="1dp"
android:background="#000"
android:layout_marginBottom="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
app:layout_constraintBottom_toBottomOf="#+id/text"
app:layout_constraintEnd_toStartOf="#+id/text"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintHorizontal_chainStyle="spread"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/button5"
app:layout_constraintVertical_bias="0.975"/>
<TextView
android:id="#+id/text"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="50dp"
android:text="Button"
android:gravity="center"
app:layout_constraintEnd_toStartOf="#+id/left_divider"
app:layout_constraintStart_toEndOf="#+id/right_divider"
app:layout_constraintTop_toBottomOf="#+id/button5"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
app:layout_constraintLeft_toLeftOf="#+id/right_divider"
app:layout_constraintRight_toRightOf="#+id/left_divider"/>
<View
android:id="#+id/left_divider"
android:layout_width="0dp"
android:layout_height="1dp"
android:layout_marginEnd="8dp"
android:background="#000"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="#+id/text"
tools:layout_editor_absoluteY="112dp"
tools:layout_editor_absoluteX="243dp"/>
<Button
android:id="#+id/button5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:text="Button"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"/>
</android.support.constraint.ConstraintLayout>

try this :
<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/gridLayout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<View
android:id="#+id/left_divider"
android:layout_width="0dp"
android:layout_height="1dp"
android:background="#color/colorPrimary"
app:layout_constraintBottom_toBottomOf="#+id/text"
app:layout_constraintEnd_toStartOf="#+id/text"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="#+id/text" />
<TextView
android:id="#+id/text"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:gravity="center"
android:text="Hello"
app:layout_constraintEnd_toStartOf="#+id/right_divider"
app:layout_constraintStart_toEndOf="#+id/left_divider"
app:layout_constraintTop_toBottomOf="#+id/button5" />
<View
android:id="#+id/right_divider"
android:layout_width="0dp"
android:layout_height="1dp"
android:background="#color/colorPrimary"
app:layout_constraintBottom_toBottomOf="#+id/text"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="#+id/text"
app:layout_constraintTop_toTopOf="#+id/text" />
<Button
android:id="#+id/button5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:text="Button"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>

You can achieve this using single divider view like:
<android.support.constraint.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">
<View
android:id="#+id/divider"
android:layout_width="0dp"
android:layout_height="1dp"
android:layout_marginStart="8dp"
android:background="#android:color/darker_gray"
app:layout_constraintBottom_toBottomOf="#+id/text"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="#+id/text" />
<TextView
android:id="#+id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:background="#android:color/white"
android:padding="5dp"
android:text="Button"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/button5" />
<Button
android:id="#+id/button5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:text="Button"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
It Outputs:

Categories

Resources