Develop Reference

how to make a constraint layout scrollable

Hello I'm trying to make one of my fragment's layout scrollable but can't reach my goal despite having looking for a solution during many hours. I removed all of the layout_constraintBottom_toBottomOf="parent" constraints inside the main constraint layout and also set the height of the layout to wrap_content. Finally I set the fillViewPort attribute of the scrollView to true but the result remains the same. Can someone help me please ?
Here's my .xml file :
<?xml version="1.0" encoding="utf-8"?>
<ScrollView
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:fillViewport="true">
<androidx.constraintlayout.widget.ConstraintLayout
android:id="#+id/layout"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ProgressBar
android:id="#+id/challengeProgressBar"
style="#android:style/Widget.DeviceDefault.Light.ProgressBar.Large"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_marginTop="300dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ImageView
android:id="#+id/errorImageView"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_marginTop="300dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<androidx.constraintlayout.widget.ConstraintLayout
android:id="#+id/visibleLayout"
android:layout_width="0dp"
android:layout_height="match_parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<TextView
android:id="#+id/profileNameTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/profileImageView" />
<ImageView
android:id="#+id/profileImageView"
android:layout_width="150dp"
android:layout_height="150dp"
android:layout_marginStart="143dp"
android:layout_marginTop="45dp"
android:layout_marginEnd="143dp"
android:padding="5dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:src="#tools:sample/avatars" />
<TextView
android:id="#+id/uploadStatusTextView"
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_marginTop="4dp"
android:layout_marginBottom="4dp"
app:layout_constraintBottom_toTopOf="#+id/profileImageView"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/nbPointsTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="30dp"
android:textAppearance="#style/TextAppearance.AppCompat.Display1"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.498"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/profileNameTextView" />
<Button
android:id="#+id/completedChallengesButton"
android:layout_width="0dp"
android:layout_height="40dp"
android:layout_marginStart="75dp"
android:layout_marginTop="52dp"
android:layout_marginEnd="75dp"
android:text="#string/completed_challenges"
android:textSize="10sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/nbPointsTextView" />
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/completedChallengesRecyclerView"
android:layout_width="0dp"
android:layout_height="150dp"
android:layout_marginStart="75dp"
android:layout_marginEnd="75dp"
android:background="#drawable/border"
android:visibility="visible"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/completedChallengesButton" />
<Button
android:id="#+id/challengesButton"
android:layout_width="0dp"
android:layout_height="40dp"
android:layout_marginStart="75dp"
android:layout_marginEnd="75dp"
android:text="#string/current_challenges"
android:textSize="10sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/completedChallengesRecyclerView" />
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/challengesRecyclerView"
android:layout_width="0dp"
android:layout_height="150dp"
android:layout_marginStart="75dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="75dp"
android:background="#drawable/border"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/challengesButton" />
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
</ScrollView>

The cause is using scrollable view (RecyclerView) inside ScrollView, so you should put this one to your RecyclerView
android:nestedScrollingEnabled="false"
But the better solution is make whole screen into only one RecyclerView

Is there any way to forbid keyboard to move LinearLayout?

I have a fragment and LinearLayout in my activity. In this fragment I have a textview. If there is no ScrollView in fragment, everything works fine. But if there is ScrollView LinearLayout move to the top of keyboard.
This is how my app looks without Scrollview on the text: https://yapx.ru/v/EPcoQ
And this how it looks with it: https://yapx.ru/v/EPcqd
I don't like that Navigation Bar on the bottom isn't hidden when the keyboard is active. What can I do to make app lok like on the first photo andk make textView scrollable?
I've tried to use "windowSoftInputMode" to forbid keyboard move this LinearLayout, but it didn't helped.
I have also tried "focusableInTouchMode" and "isScrollContainer"
attributes, but they were useless too.
This is the activity file:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/main_chetnost"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#86A0FC"
android:windowSoftInputMode="adjustResize"
>
<fragment
android:id="#+id/fragment_theory"
android:name="com.example.user.mathplace_1.theory"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_constraintBottom_toTopOf="#+id/linearLayout"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/toolbar" />
<fragment
android:id="#+id/fragment_task"
android:name="com.example.user.mathplace_1.Task"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_constraintBottom_toTopOf="#+id/linearLayout"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/toolbar"
app:layout_constraintVertical_bias="0.0" />
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="0dp"
android:layout_height="60dp"
android:background="?attr/colorPrimary"
android:minHeight="?attr/actionBarSize"
android:theme="?attr/actionBarTheme"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:title="MathPlace"
app:titleTextColor="#fff">
<ImageButton
android:id="#+id/homeButton"
android:layout_width="44dp"
android:layout_height="44dp"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_gravity="end"
android:layout_marginStart="8dp"
android:layout_marginTop="6dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="6dp"
android:background="#drawable/home"
android:contentDescription="#string/report_description"
android:onClick="delete"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.887"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.987" />
</android.support.v7.widget.Toolbar>
<LinearLayout
android:id="#+id/linearLayout"
android:layout_width="match_parent"
android:layout_height="75dp"
android:background="#FFF"
android:orientation="horizontal"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
android:focusableInTouchMode="false"
android:isScrollContainer="false">
<HorizontalScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#accbff"
android:orientation="horizontal"
android:focusableInTouchMode="false"
android:isScrollContainer="false">
<LinearLayout
android:id="#+id/LinearLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:focusableInTouchMode="false"
android:isScrollContainer="false"/>
</HorizontalScrollView>
</LinearLayout>
</android.support.constraint.ConstraintLayout>
And this is the fragment code:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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:background="#color/background"
xmlns:app="http://schemas.android.com/apk/res-auto">
<EditText
android:id="#+id/editText"
android:layout_width="237dp"
android:layout_height="46dp"
android:layout_marginTop="8dp"
android:ems="10"
android:hint="Введите ваш ответ"
android:inputType="number"
android:textColor="#5B6175"
android:textSize="23sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="#+id/cardView"
app:layout_constraintTop_toBottomOf="#+id/cardView"
app:layout_constraintVertical_bias="0.3" />
<ImageButton
android:id="#+id/send"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_marginTop="8dp"
android:background="#drawable/send"
android:onClick="send"
android:scaleType="fitXY"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="#+id/cardView"
app:layout_constraintTop_toBottomOf="#+id/cardView"
app:layout_constraintVertical_bias="0.3" />
<android.support.v7.widget.CardView
android:id="#+id/cardView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.4">
<ScrollView
android:id="#+id/scrollView4"
android:layout_width="310dp"
android:layout_height="375dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="#+id/textView3"
android:layout_width="310dp"
android:layout_height="375dp"
android:background="#drawable/text_rounded_corner"
android:padding="8dp"
android:text="dddddddddddddddddddddddd"
android:textColor="#5B6175"
android:textSize="20sp" />
</LinearLayout>
</ScrollView>
</android.support.v7.widget.CardView>
<TextView
android:id="#+id/textView"
android:layout_width="310dp"
android:layout_height="47dp"
android:background="#drawable/title_rounded_corner"
android:padding="8dp"
android:text="Заголовок"
android:textColor="#FFF"
android:textSize="24sp"
app:layout_constraintBottom_toTopOf="#+id/cardView"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.504"
app:layout_constraintStart_toStartOf="parent" />
<ImageView
android:id="#+id/star2"
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_marginEnd="44dp"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toBottomOf="#+id/textView"
app:layout_constraintEnd_toEndOf="#+id/textView"
app:layout_constraintTop_toTopOf="#+id/textView"
app:layout_constraintVertical_bias="1.0"
app:srcCompat="#drawable/star" />
<ImageView
android:id="#+id/star1"
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_marginEnd="12dp"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toBottomOf="#+id/textView"
app:layout_constraintEnd_toEndOf="#+id/textView"
app:layout_constraintTop_toTopOf="#+id/textView"
app:layout_constraintVertical_bias="1.0"
app:srcCompat="#drawable/star" />
<ImageView
android:id="#+id/star3"
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_marginEnd="76dp"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toBottomOf="#+id/textView"
app:layout_constraintEnd_toEndOf="#+id/textView"
app:layout_constraintTop_toTopOf="#+id/textView"
app:layout_constraintVertical_bias="1.0"
app:srcCompat="#drawable/star" />
</android.support.constraint.ConstraintLayout>

I've found how I can make my text scrollable without breaking old app view.
I just needed to add one line to the java file:
myTextview.setMovementMethod(new ScrollingMovementMethod());

Fragments ConstraintLayout is cut of in FrameLayout of activity

I have an activity LoginActivity and a fragment SignupSocialFragment.
The fragment is loaded inside of the FrameLayout inside the activity.
The problem is, that the LinearLayout (social_login_footer) in fragment which is constrained to the bottom of its parent is cut of when the fragment is displayed in the activity.
When I add padding/margin to the social_login_footerI can shift it into view but this does not work reliable.
Can anyone help with why the bottom part is cut of?
Shouldnt the ConstraintLayout match the height of its parent FrameLayout.
Code
activity_login.xml
<?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:id="#+id/login_constraint"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/colorBlack"
tools:context=".ui.login.LoginActivity">
<androidx.constraintlayout.widget.ConstraintLayout
android:id="#+id/login_constraint_2"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<com.airbnb.lottie.LottieAnimationView
android:id="#+id/login_lottie_animation"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="centerCrop"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:lottie_autoPlay="true"
app:lottie_fileName="background_rotation.json"
app:lottie_loop="true" />
</androidx.constraintlayout.widget.ConstraintLayout>
<ImageView
android:id="#+id/login_logo"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:layout_marginBottom="8dp"
android:adjustViewBounds="true"
android:contentDescription="#string/app_name"
android:scaleType="centerInside"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.050000012"
app:srcCompat="#drawable/logo_white" />
<TextView
android:id="#+id/login_logo_subtitle"
android:layout_width="wrap_content"
android:layout_height="0dp"
android:text="#string/slogan"
android:textColor="#color/colorWhite"
android:textSize="16sp"
android:translationY="-10dp"
app:layout_constraintEnd_toEndOf="#+id/login_logo"
app:layout_constraintStart_toStartOf="#+id/login_logo"
app:layout_constraintTop_toBottomOf="#id/login_logo" />
<FrameLayout
android:id="#+id/login_content"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginTop="8dp"
android:layout_marginBottom="16dp"
app:layout_constraintTop_toBottomOf="#+id/login_logo_subtitle"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
fragment_login_social.xml
<?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="#300000CC "
android:paddingStart="32dp"
android:paddingEnd="32dp"
tools:context=".ui.login.SignupSocialFragment">
<TextView
android:id="#+id/login_social_text"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:layout_marginBottom="32dp"
android:fontFamily="#font/montserrat_light"
android:text="#string/login_subtitle"
android:textAlignment="center"
android:textSize="16sp"
app:layout_constraintBottom_toTopOf="#+id/social_login_email"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="#+id/social_login_email"
android:layout_marginTop="8dp"
android:layout_marginBottom="8dp"
android:text="#string/email_signup_btn"
app:layout_constraintBottom_toTopOf="#+id/social_login_facebook"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/login_social_text" />
<Button
android:id="#+id/social_login_facebook"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="4dp"
android:layout_marginBottom="8dp"
app:icon="#drawable/facebook_logo"
app:iconGravity="textStart"
app:layout_constraintBottom_toTopOf="#+id/social_login_google"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/social_login_email" />
<androidx.constraintlayout.widget.ConstraintLayout
android:id="#+id/social_login_google"
android:layout_width="0dp"
android:layout_height="60dp"
android:layout_marginTop="16dp"
android:background="#color/colorWhite"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/social_login_facebook">
<TextView
android:id="#+id/social_login_google_txt"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:text="#string/google_signup_btn"
android:textColor="#android:color/black"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ImageView
android:id="#+id/social_login_google_logo"
android:layout_width="24dp"
android:layout_height="24dp"
android:layout_marginEnd="8dp"
android:src="#drawable/googleg_standard_color_18"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="#+id/social_login_google_txt"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
<TextView
android:id="#+id/social_login_member"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:padding="4dp"
android:text="#string/already_member"
android:textSize="16sp"
android:clickable="true"
android:focusable="true"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/social_login_google" />
<LinearLayout
android:id="#+id/social_login_footer"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent">
<TextView
android:id="#+id/login_version"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/app_version"
android:layout_marginEnd="4dp"
android:textSize="12sp" />
<TextView
android:id="#+id/login_policy"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="4dp"
android:text="#string/privacy_link"
android:textSize="12sp" />
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
Layout blueprints
Rendered on Nexus 5X API 28

After wasting some hours of my precious lifetime I have finally found it.
The problem is caused by the ImageViews android:adjustViewBounds="true" attribute.
After removing it everything works as expected.

Try adding android:fitsSystemWindows="true" to fragment_login_social.xml first child view

How to adjust constraint layout to scroll view to fit all screen?

I have problem in the bottom layout where my constraint layout does not fill the scroll view entirely(blank space bellow). This is the image evidence of the problem.
In this case I want the gray background to fill that white space below. I tried match parent in everything but it does not work.
This is my xml file that belongs to the layout I uploaded
<?xml version="1.0" encoding="utf-8"?>
<layout 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/layout">
<data>
<variable
name="viewModel"
type="com.repsol.repsolmove.ui.login.LoginViewModel" />
</data>
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.core.widget.NestedScrollView
android:id="#+id/scrolView"
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="#+id/imageView"
android:layout_width="174dp"
android:layout_height="70dp"
android:layout_marginStart="8dp"
android:layout_marginTop="16dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="3dp"
android:src="#drawable/ic_img_logo_repsolmove"
app:layout_constraintBottom_toTopOf="#+id/imageBottomMargin"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<com.repsol.repsolmove.ui.widgets.RepsolInputLayout
android:id="#+id/login"
android:layout_width="0dp"
android:layout_height="105dp"
android:layout_marginTop="30dp"
app:errorText="#string/invalid_card_number"
app:layout_constraintEnd_toStartOf="#+id/marginEnd"
app:layout_constraintStart_toStartOf="#+id/marginStart"
app:layout_constraintTop_toBottomOf="#+id/imageView"
app:titleText="#string/login_title" />
<com.repsol.repsolmove.ui.widgets.RepsolInputLayout
android:id="#+id/password"
android:layout_width="0dp"
android:layout_height="105dp"
app:errorText="#string/invalid_password"
app:isPassword="true"
app:layout_constraintEnd_toStartOf="#+id/marginEnd"
app:layout_constraintStart_toStartOf="#+id/marginStart"
app:layout_constraintTop_toBottomOf="#+id/login"
app:titleText="#string/password_title" />
<TextView
android:id="#+id/newPassword"
style="#style/RepsolText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="24dp"
android:layout_marginEnd="8dp"
android:fontFamily="#font/repsol_regular"
android:text="#string/new_password"
android:textSize="16dp"
app:layout_constraintEnd_toStartOf="#+id/marginEnd"
app:layout_constraintTop_toBottomOf="#+id/password" />
<Button
android:id="#+id/btnLogin"
android:layout_width="228dp"
android:layout_height="50dp"
android:layout_marginStart="8dp"
android:layout_marginTop="32dp"
android:layout_marginEnd="8dp"
android:background="#drawable/shape_rounded_fill_rectangle"
android:fontFamily="#font/repsol_regular"
android:text="#string/login"
android:textAllCaps="false"
android:textColor="#android:color/white"
android:textSize="16sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/newPassword" />
<Button
android:id="#+id/btnJoin"
android:layout_width="0dp"
android:layout_height="51dp"
android:layout_marginStart="8dp"
android:layout_marginTop="32dp"
android:layout_marginEnd="16dp"
android:layout_marginBottom="32dp"
android:background="#drawable/shape_rounded_rectangle"
android:fontFamily="#font/repsol_regular"
android:text="#string/join"
android:textAllCaps="false"
android:textColor="#color/colorPrimaryDark"
android:textSize="16sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="#+id/btnNologin"
app:layout_constraintHorizontal_chainStyle="packed"
app:layout_constraintStart_toStartOf="#+id/marginStart"
app:layout_constraintTop_toBottomOf="#+id/btnLogin"
app:layout_constraintVertical_bias="0.75" />
<Button
android:id="#+id/btnNologin"
android:layout_width="0dp"
android:layout_height="51dp"
android:layout_marginStart="16dp"
android:layout_marginTop="16dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="32dp"
android:background="#drawable/shape_rounded_no_stroke_rectangle"
android:fontFamily="#font/repsol_regular"
android:text="#string/enter_without_login"
android:textAllCaps="false"
android:textColor="#color/colorPrimaryDark"
android:textSize="16sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="#+id/marginEnd"
app:layout_constraintStart_toEndOf="#+id/btnJoin"
app:layout_constraintTop_toBottomOf="#+id/btnLogin"
app:layout_constraintVertical_bias="0.75" />
<androidx.constraintlayout.widget.Guideline
android:id="#+id/imageBottomMargin"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_percent="0.30" />
<androidx.constraintlayout.widget.Guideline
android:id="#+id/marginStart"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_percent="0.10" />
<androidx.constraintlayout.widget.Guideline
android:id="#+id/marginEnd"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_percent="0.90" />
<com.repsol.repsolmove.ui.widgets.RepsolDialog
android:id="#+id/dialog"
android:layout_width="match_parent"
android:layout_height="0dp"
android:elevation="10dp"
android:visibility="visible"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<include
android:id="#+id/loading"
layout="#layout/loading"
android:visibility="gone"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.core.widget.NestedScrollView>
</androidx.constraintlayout.widget.ConstraintLayout>
</layout>

Add this attribute to your NestScrollView element in xml file
android:fillViewport="true"

Align layout at the bottom of the screen

I would like to have the same as on the enclosed image with the scanning information widgets (progressbar, textview and button) to stay at the bottom of the screen. However when I run my app they go at the top of the screen when the ListView is empty.
I tried a lot of methods described in other topics, but I still could not make it work.
Do you have some suggestions about which layout I should use in this case?
<?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">
<ListView
android:id="#+id/ListViewDevices"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginBottom="60dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<FrameLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/ListViewDevices">
<android.support.constraint.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ProgressBar
android:id="#+id/progressBarDevice"
style="?android:attr/progressBarStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="#+id/lblScanningStatus"
app:layout_constraintStart_toStartOf="parent" />
<TextView
android:id="#+id/lblScanningStatus"
android:layout_width="wrap_content"
android:layout_height="24dp"
android:layout_marginStart="8dp"
android:layout_marginBottom="20dp"
android:text="#string/scan_in_progress"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toEndOf="#+id/progressBarDevice" />
<Button
android:id="#+id/btnPauseScan"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:text="#string/pause_scan"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent" />
</android.support.constraint.ConstraintLayout>
</FrameLayout>
</android.support.constraint.ConstraintLayout>

This is the way I did it an app I worked on previously. Using a RelativeLayout as the main shell we are able to position elements in any way inside it.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="10"
android:background="#color/white"
android:orientation="vertical">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="55dp"
android:layout_alignParentBottom="true"
android:background="#color/grey_font">
<ProgressBar
android:id="#+id/progressBarDevice"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_centerVertical="true"
android:layout_marginLeft="12dp" />
<TextView
android:id="#+id/lblScanningStatus"
android:layout_width="wrap_content"
android:layout_height="24dp"
android:layout_centerVertical="true"
android:layout_marginLeft="24dp"
android:layout_toRightOf="#id/progressBarDevice"
android:text="Scanning" />
<Button
android:layout_marginRight="16dp"
android:layout_centerVertical="true"
android:background="#color/orange_pay"
android:id="#+id/btnPauseScan"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_marginBottom="8dp"
android:text="PAUSE" />
</RelativeLayout>
</RelativeLayout>

I would first simplify the layout by flattening it slightly. Removed the FrameLayout that holds the bottom Constraint.. Then made the listViewDevices constrain bottom to top of the bottom contraint layout (which i have called scanner)..
Looks correct in my layout editor.
<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">
<ListView
android:id="#+id/ListViewDevices"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginBottom="60dp"
app:layout_constraintBottom_toTopOf="#id/scanner"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<android.support.constraint.ConstraintLayout
android:id="#+id/scanner"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
app:layout_constraintHorizontal_bias="1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="#id/ListViewDevices"
app:layout_constraintBottom_toBottomOf="parent">
<ProgressBar
android:id="#+id/progressBarDevice"
style="?android:attr/progressBarStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="#+id/lblScanningStatus"
app:layout_constraintStart_toStartOf="parent" />
<TextView
android:id="#+id/lblScanningStatus"
android:layout_width="wrap_content"
android:layout_height="24dp"
android:layout_marginStart="8dp"
android:layout_marginBottom="20dp"
android:text="SCANNING FOR NEW DEVICES..."
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toEndOf="#+id/progressBarDevice" />
<Button
android:id="#+id/btnPauseScan"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:text="PAUSE"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent" />
</android.support.constraint.ConstraintLayout>

I would rather prefer to add LinearLayout as root layout.
So when you scroll down or up then it will not scroll with your layout when its empty.
So when your listview is empty then also it will be in the bottom of the screen only.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
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:orientation="vertical" >
<ListView
android:id="#+id/ListViewDevices"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="60dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<FrameLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/ListViewDevices">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ProgressBar
android:id="#+id/progressBarDevice"
style="?android:attr/progressBarStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="#+id/lblScanningStatus"
app:layout_constraintStart_toStartOf="parent" />
<TextView
android:id="#+id/lblScanningStatus"
android:layout_width="wrap_content"
android:layout_height="24dp"
android:layout_marginStart="8dp"
android:layout_marginBottom="20dp"
android:text="#string/scan_in_progress"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toEndOf="#+id/progressBarDevice" />
<Button
android:id="#+id/btnPauseScan"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:text="#string/pause_scan"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent" />
</LinearLayout>
</FrameLayout>
</LinearLayout>

Thank you for your answers but none of them works. Sometimes it looks fine in Android Studio but when I test my application on a real phone the widgets are displayed on top of the screen.
If I will find a working solution I will post it here.