why my button can't be overlaid by another view in Android? - android

I am new in Android development. I have a View that has black background color that also has opacity 75% so it will make like a shadow above the edit text, text view and button.
as you can see in the component tree, I have placed the button at the top, and the shadow view in the bottom. I expect that green button will be overlaid below the shadow view, but as you can see, it still on the top of the shadow view
here is the xml I use:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".Fragments.Search.SearchFragment"
android:id="#+id/constraintLayout_search">
<Button
android:text="Cari Acara"
android:layout_width="0dp"
android:layout_height="50dp" android:id="#+id/button_search_event_search"
android:layout_marginTop="32dp"
app:layout_constraintTop_toBottomOf="#+id/editText_event_city_search"
app:layout_constraintStart_toStartOf="parent" android:layout_marginStart="16dp"
app:layout_constraintEnd_toEndOf="parent" android:layout_marginEnd="16dp"
android:background="#drawable/rounded_button"
android:textColor="#ffffff" app:layout_constraintHorizontal_bias="0.0"/>
<View
android:layout_width="0dp"
android:layout_height="48dp"
android:id="#+id/view_outer_search_bar_search_fragment"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent" android:background="?attr/colorPrimary"
app:layout_constraintTop_toTopOf="parent"/>
<View
android:layout_width="0dp"
android:layout_height="35dp"
android:id="#+id/view_inner_rounded_search_fragment"
android:background="#drawable/round_outline_search_view"
app:layout_constraintEnd_toEndOf="#+id/view_outer_search_bar_search_fragment"
app:layout_constraintStart_toStartOf="#+id/view_outer_search_bar_search_fragment"
android:layout_marginEnd="16dp"
app:layout_constraintHorizontal_bias="0.0"
android:layout_marginStart="16dp"
app:layout_constraintTop_toTopOf="parent"/>
<ImageView
android:src="#drawable/ic_search"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/imageView_search_icon_search_bar_search_fragment"
app:layout_constraintStart_toStartOf="#+id/view_inner_rounded_search_fragment"
android:layout_marginStart="8dp"
app:layout_constraintTop_toTopOf="#+id/view_inner_rounded_search_fragment"
app:layout_constraintBottom_toBottomOf="#+id/view_inner_rounded_search_fragment"/>
<EditText
android:layout_width="0dp"
android:layout_height="0dp"
android:inputType="textPersonName"
android:ems="10"
android:id="#+id/editText_search_keyword_search_fragment"
android:hint="Ketik nama acara, ustadz atau lokasi" android:textSize="12sp"
app:layout_constraintStart_toEndOf="#+id/imageView_search_icon_search_bar_search_fragment"
android:layout_marginStart="4dp" android:layout_marginEnd="8dp"
app:layout_constraintEnd_toEndOf="#+id/view_inner_rounded_search_fragment"
app:layout_constraintTop_toTopOf="#+id/view_inner_rounded_search_fragment"
app:layout_constraintBottom_toBottomOf="#+id/view_inner_rounded_search_fragment"
android:background="#android:color/transparent"
android:imeOptions="actionSearch"
android:maxLines="1"/>
<TextView
android:text="Jenis Acara"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/textView_event_type_label_search"
android:layout_marginTop="24dp" app:layout_constraintTop_toBottomOf="#id/view_grey_search_fragment"
app:layout_constraintStart_toEndOf="#+id/imageView_event_type_icon_search" android:layout_marginStart="16dp"/>
<ImageView
android:src="#drawable/ic_help"
android:layout_width="30dp"
android:layout_height="30dp"
android:id="#+id/imageView_event_type_icon_search" app:layout_constraintStart_toStartOf="parent"
android:layout_marginStart="16dp" android:layout_marginTop="8dp"
app:layout_constraintTop_toBottomOf="#+id/textView_event_type_label_search"/>
<EditText
android:layout_width="0dp"
android:layout_height="wrap_content"
android:inputType="textPersonName"
android:ems="10"
android:id="#+id/editText_event_type_search"
app:layout_constraintTop_toTopOf="#+id/imageView_event_type_icon_search" app:layout_constraintBottom_toBottomOf="#+id/imageView_event_type_icon_search"
app:layout_constraintStart_toEndOf="#+id/imageView_event_type_icon_search" android:layout_marginStart="16dp"
app:layout_constraintEnd_toEndOf="parent" android:layout_marginEnd="16dp" tools:text="Kajian Islam"
android:cursorVisible="false"
android:focusable="false"
android:focusableInTouchMode="false"/>
<ImageView
android:src="#drawable/ic_date_time"
android:layout_width="30dp"
android:layout_height="30dp"
android:id="#+id/imageView_event_time_icon_search"
app:layout_constraintStart_toStartOf="parent"
android:layout_marginStart="16dp" app:layout_constraintTop_toBottomOf="#+id/textView_event_time_label_search"
android:layout_marginTop="8dp"/>
<TextView
android:text="Waktu"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/textView_event_time_label_search" android:layout_marginTop="16dp"
app:layout_constraintTop_toBottomOf="#+id/editText_event_type_search" app:layout_constraintStart_toEndOf="#+id/imageView_event_time_icon_search"
android:layout_marginStart="16dp"/>
<EditText
android:layout_width="0dp"
android:layout_height="wrap_content"
android:inputType="textPersonName"
android:ems="10"
android:id="#+id/editText_event_date_time_search"
app:layout_constraintTop_toTopOf="#+id/imageView_event_time_icon_search"
app:layout_constraintBottom_toBottomOf="#+id/imageView_event_time_icon_search"
app:layout_constraintStart_toEndOf="#+id/imageView_event_time_icon_search" android:layout_marginStart="16dp"
app:layout_constraintEnd_toEndOf="parent" android:layout_marginEnd="16dp" tools:text="Besok"
android:cursorVisible="false"
android:focusable="false"
android:focusableInTouchMode="false"/>
<ImageView
android:src="#drawable/ic_place"
android:layout_width="30dp"
android:layout_height="30dp"
android:id="#+id/imageView_event_city_icon_search" app:layout_constraintStart_toStartOf="parent"
android:layout_marginStart="16dp" android:layout_marginTop="16dp"
app:layout_constraintTop_toBottomOf="#+id/textView_event_city_label_search"/>
<TextView
android:text="Kota"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/textView_event_city_label_search" android:layout_marginTop="16dp"
app:layout_constraintTop_toBottomOf="#+id/editText_event_date_time_search" app:layout_constraintStart_toEndOf="#+id/imageView_event_city_icon_search"
android:layout_marginStart="16dp"/>
<EditText
android:layout_width="0dp"
android:layout_height="wrap_content"
android:inputType="textPersonName"
android:ems="10"
android:id="#+id/editText_event_city_search"
app:layout_constraintBottom_toBottomOf="#+id/imageView_event_city_icon_search"
app:layout_constraintTop_toTopOf="#+id/imageView_event_city_icon_search" app:layout_constraintStart_toEndOf="#+id/imageView_event_city_icon_search"
android:layout_marginStart="16dp" app:layout_constraintEnd_toEndOf="parent"
android:layout_marginEnd="16dp" tools:text="Jakarta"
android:cursorVisible="false"
android:focusable="false"
android:focusableInTouchMode="false"/>
<View
android:layout_width="0dp"
android:layout_height="26dp"
android:id="#+id/view_grey_search_fragment" app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
android:background="#E3E5E7"
app:layout_constraintTop_toBottomOf="#+id/view_outer_search_bar_search_fragment"/>
<TextView
android:text="Atau cari berdasarkan"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/textView_find_based_on" android:textSize="12sp"
app:layout_constraintBottom_toBottomOf="#+id/view_grey_search_fragment"
app:layout_constraintTop_toTopOf="#+id/view_grey_search_fragment"
app:layout_constraintStart_toStartOf="#+id/view_grey_search_fragment" android:layout_marginStart="16dp"
android:textColor="#959799"/>
<View
android:layout_width="0dp"
android:layout_height="0dp"
android:id="#+id/view_shadow_search_fragment"
app:layout_constraintTop_toBottomOf="#+id/view_outer_search_bar_search_fragment"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.55"
app:layout_constraintBottom_toBottomOf="parent" android:background="#B3030000"
android:visibility="visible"/>
</androidx.constraintlayout.widget.ConstraintLayout>
so how to make my button overlaid by that shadow view ?


For overlapping views should use FrameLayout or RelativeLayout. I've linked great article for you . Article Link
In this Article RelativeLayout has been used but I highly recommend to you to use FrameLayout for your purpose


Buttons have a higher elevation than other views, even if you declare it earlier in the layout.
you can either
1) wrap your button inside a FrameLayout.
<FrameLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
... or whatever constraints is required.
>
<Button ... the button of interest/>
</FrameLayout>
or
2) elevate the view that is covering over your button.
<View
android:elevation="2dp"
android:layout_width="match_parent"
android:layout_height="0dp"
android:id="#+id/view_shadow_search_fragment"
app:layout_constraintTop_toBottomOf="#+id/view_outer_search_bar_search_fragment"
app:layout_constraintHorizontal_bias="0.55"
app:layout_constraintBottom_toBottomOf="parent" android:background="#B3030000"
android:visibility="visible"/>

Related

how can I put empty space between password and register button in my constrainlayout

I am developing android app and I have implemented constrainlayout but in real device password edit text and register button overlapping to each other I want to empty space between them how can achieve that
below my currentlayout
<?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/white">
<androidx.constraintlayout.widget.ConstraintLayout
android:id="#+id/constraintLayout"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_marginTop="100dp"
android:background="#drawable/circle_back"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="#drawable/ic_person">
<ImageView
android:id="#+id/person_icon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:contentDescription="#string/empty"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="#drawable/ic_person" />
</androidx.constraintlayout.widget.ConstraintLayout>
<EditText
android:id="#+id/name"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginTop="40dp"
android:layout_marginEnd="16dp"
android:hint="#string/firstname"
style="#style/textFieldStyle"
android:inputType="textEmailAddress"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/constraintLayout"
tools:ignore="RtlSymmetry"
android:autofillHints="" />
<EditText
android:id="#+id/email"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
style="#style/textFieldStyle"
android:hint="#string/email"
android:inputType="textEmailAddress"
app:layout_constraintEnd_toEndOf="#+id/name"
app:layout_constraintStart_toStartOf="#+id/name"
app:layout_constraintTop_toBottomOf="#+id/lastName"
tools:ignore="TextFields" />
<Button
android:id="#+id/registration"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginBottom="40dp"
android:backgroundTint="#color/gray"
android:fontFamily="#font/roboto_black"
android:padding="16dp"
android:text="#string/register"
app:layout_constraintBottom_toTopOf="#+id/already_have_account"
app:layout_constraintEnd_toEndOf="#+id/password"
app:layout_constraintStart_toStartOf="parent" />
<TextView
android:id="#+id/already_have_account"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="32dp"
android:text="#string/already_have_an_account"
android:textColor="#color/primaryBlack"
android:textSize="12sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.33"
app:layout_constraintStart_toStartOf="parent" />
<TextView
android:id="#+id/login"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="32dp"
android:text="#string/login"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.73"
app:layout_constraintStart_toStartOf="parent" />
<EditText
android:id="#+id/password"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:layout_marginBottom="16dp"
android:hint="#string/password"
android:inputType="textPassword"
style="#style/textFieldStyle"
app:layout_constraintEnd_toEndOf="#+id/email"
app:layout_constraintStart_toStartOf="#+id/email"
app:layout_constraintTop_toBottomOf="#+id/email" />
<EditText
android:id="#+id/lastName"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
style="#style/textFieldStyle"
android:hint="#string/lastName"
android:inputType="textPersonName"
app:layout_constraintEnd_toEndOf="#+id/name"
app:layout_constraintStart_toStartOf="#+id/name"
app:layout_constraintTop_toBottomOf="#+id/name" />
</androidx.constraintlayout.widget.ConstraintLayout>
following screenshot in real device I want to know what I have to do in order to put space between password and register button
but I want to see in real device as if you see there space between password and register button

Add a constraint from the top of the register button to the bottom of the password field. Every element should have a top and bottom constraint to not overlap another element that is above or below it.

When you do something like android:layout_marginBottom="40dp", you will eventually get some views overlapping and that's because you are using hardcoded values, you want to adjust your views to the size of your screen in a responsive way.
You can do it using Guidelines, app:layout_constraintHeight_percent="0.xx" and chain verticly your views:
Inside you constarintLayout (I have used a single layout)
<ImageView
android:id="#+id/imageView"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintBottom_toTopOf="#+id/editTextTextPersonName"
app:layout_constraintDimensionRatio="1:1"
app:layout_constraintEnd_toStartOf="#+id/guideline4"
app:layout_constraintHeight_percent="0.25"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="#+id/guideline3"
app:layout_constraintTop_toTopOf="parent"
tools:srcCompat="#tools:sample/backgrounds/scenic" />
<EditText
android:id="#+id/editTextTextPersonName"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintHeight_percent="0.07"
android:ems="10"
android:inputType="textPersonName"
android:text="FirstName"
app:layout_constraintBottom_toTopOf="#+id/editTextTextPersonName2"
app:layout_constraintEnd_toStartOf="#+id/guideline4"
app:layout_constraintStart_toStartOf="#+id/guideline3"
app:layout_constraintTop_toBottomOf="#+id/imageView" />
<EditText
android:id="#+id/editTextTextPersonName2"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintHeight_percent="0.07"
android:ems="10"
android:inputType="textPersonName"
android:text="LastName"
app:layout_constraintBottom_toTopOf="#+id/editTextTextPersonName3"
app:layout_constraintEnd_toEndOf="#+id/editTextTextPersonName"
app:layout_constraintStart_toStartOf="#+id/editTextTextPersonName"
app:layout_constraintTop_toBottomOf="#+id/editTextTextPersonName" />
<EditText
android:id="#+id/editTextTextPersonName3"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintHeight_percent="0.07"
android:ems="10"
android:inputType="textPersonName"
android:text="Email"
app:layout_constraintBottom_toTopOf="#+id/editTextTextPersonName4"
app:layout_constraintEnd_toEndOf="#+id/editTextTextPersonName"
app:layout_constraintStart_toStartOf="#+id/editTextTextPersonName"
app:layout_constraintTop_toBottomOf="#+id/editTextTextPersonName2" />
<EditText
android:id="#+id/editTextTextPersonName4"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintHeight_percent="0.07"
android:ems="10"
android:inputType="textPersonName"
android:text="Password"
app:layout_constraintBottom_toTopOf="#+id/button"
app:layout_constraintEnd_toEndOf="#+id/editTextTextPersonName"
app:layout_constraintStart_toStartOf="#+id/editTextTextPersonName"
app:layout_constraintTop_toBottomOf="#+id/editTextTextPersonName3" />
<Button
android:id="#+id/button"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintHeight_percent="0.07"
android:text="Register"
app:layout_constraintBottom_toTopOf="#+id/guideline2"
app:layout_constraintEnd_toEndOf="#+id/editTextTextPersonName4"
app:layout_constraintStart_toStartOf="#+id/editTextTextPersonName4"
app:layout_constraintTop_toBottomOf="#+id/editTextTextPersonName4" />
<androidx.constraintlayout.widget.Guideline
android:id="#+id/guideline2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_percent="0.85" />
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Already have account?"
app:layout_constraintBottom_toBottomOf="#+id/textView2"
app:layout_constraintEnd_toStartOf="#+id/textView2"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="#+id/textView2" />
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Log in"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toEndOf="#+id/textView"
app:layout_constraintTop_toTopOf="#+id/guideline2" />
<androidx.constraintlayout.widget.Guideline
android:id="#+id/guideline3"
android:layout_width="wrap_content"
app:layout_constraintGuide_percent="0.05"
android:layout_height="wrap_content"
android:orientation="vertical" />
<androidx.constraintlayout.widget.Guideline
android:id="#+id/guideline4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintGuide_percent="0.95"
android:orientation="vertical" />
It will look like this (arrows pointing to the guidelines):

Adding app:layout_constraintTop_toBottomOf.
<Button
android:id="#+id/registration"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginBottom="40dp"
android:backgroundTint="#color/gray"
android:fontFamily="#font/roboto_black"
android:padding="16dp"
android:text="#string/register"
app:layout_constraintBottom_toTopOf="#+id/already_have_account"
app:layout_constraintEnd_toEndOf="#+id/password"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#id/password" />
Adding app:layout_constraintBottom_toTopOf="#id/registration"
<EditText
android:id="#+id/password"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:layout_marginBottom="16dp"
android:hint="#string/password"
android:inputType="textPassword"
style="#style/textFieldStyle"
app:layout_constraintEnd_toEndOf="#+id/email"
app:layout_constraintStart_toStartOf="#+id/email"
app:layout_constraintTop_toBottomOf="#+id/email"
app:layout_constraintBottom_toTopOf="#id/registration" />
The above solution works only when all of your views are within a single screen. If height of the View is bigger than the screen, then you may need ScrollView or other method.
<?xml version="1.0" encoding="utf-8"?>
<ScrollView
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">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/white">
... your main content here ...
</androidx.constraintlayout.widget.ConstraintLayout>
</LinearLayout>
</ScrollView>
Adding ScrollView and LinearLayout outside your main content ConstraintLayout solves the overlapping issue, and allow bigger view to scroll on smaller view.

Try increasing the margin_botton of the password field and also decreasing margin_botton of the Button.

The Problem is that your register button is bottom aligned, while the above elements are top aligned, which means they will overlap on smaller screens.
Try updating your Register button in the following way to enforce a minimum top margin with the password field if there is too little space (I just added a constraint to the password field, set constraintVerticalbias to 1.0 and set a topMargin):
<Button
android:id="#+id/registration"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginTop="ENTER YOUR TOP MARGIN HERE"
android:layout_marginBottom="40dp"
android:backgroundTint="#color/gray"
android:fontFamily="#font/roboto_black"
android:padding="16dp"
android:text="#string/register"
app:layout_constraintBottom_toTopOf="#+id/already_have_account"
app:layout_constraintEnd_toEndOf="#+id/password"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/password"
app:layout_constraintVertical_bias="1.0" />
IMPORTANT: To make this work you need to wrap your screen in a Scrollview with android:fillViewport="true".
Here would be your whole layout reworked so that it should work (with registerbutton minimum top margin of 40dp):
<?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:background="#color/white">
<ScrollView
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="wrap_content">
<LinearLayout
android:id="#+id/constraintLayout"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_marginTop="100dp"
android:background="#drawable/circle_back"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="#drawable/ic_person">
<ImageView
android:id="#+id/person_icon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:contentDescription="#string/empty"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="#drawable/ic_person" />
</LinearLayout>
<EditText
android:id="#+id/name"
style="#style/textFieldStyle"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginTop="40dp"
android:layout_marginEnd="16dp"
android:autofillHints=""
android:hint="#string/firstname"
android:inputType="textEmailAddress"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/constraintLayout"
tools:ignore="RtlSymmetry" />
<EditText
android:id="#+id/email"
style="#style/textFieldStyle"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:hint="#string/email"
android:inputType="textEmailAddress"
app:layout_constraintEnd_toEndOf="#+id/name"
app:layout_constraintStart_toStartOf="#+id/name"
app:layout_constraintTop_toBottomOf="#+id/lastName"
tools:ignore="TextFields" />
<Button
android:id="#+id/registration"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginTop="40dp"
android:layout_marginBottom="40dp"
android:backgroundTint="#color/gray"
android:fontFamily="#font/roboto_black"
android:padding="16dp"
android:text="#string/register"
app:layout_constraintBottom_toTopOf="#+id/already_have_account"
app:layout_constraintEnd_toEndOf="#+id/password"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/password"
app:layout_constraintVertical_bias="1.0" />
<TextView
android:id="#+id/already_have_account"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="32dp"
android:text="#string/already_have_an_account"
android:textColor="#color/primaryBlack"
android:textSize="12sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.33"
app:layout_constraintStart_toStartOf="parent" />
<TextView
android:id="#+id/login"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="32dp"
android:text="#string/login"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.73"
app:layout_constraintStart_toStartOf="parent" />
<EditText
android:id="#+id/password"
style="#style/textFieldStyle"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:hint="#string/password"
android:inputType="textPassword"
app:layout_constraintEnd_toEndOf="#+id/email"
app:layout_constraintStart_toStartOf="#+id/email"
app:layout_constraintTop_toBottomOf="#+id/email" />
<EditText
android:id="#+id/lastName"
style="#style/textFieldStyle"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:hint="#string/lastName"
android:inputType="textPersonName"
app:layout_constraintEnd_toEndOf="#+id/name"
app:layout_constraintStart_toStartOf="#+id/name"
app:layout_constraintTop_toBottomOf="#+id/name" />
</androidx.constraintlayout.widget.ConstraintLayout>
</ScrollView>
</LinearLayout>

Why isn't my whole LineairLayout showing?

I'm making an Custom Dialog. I have 2 buttons, "Select Other Cards" and "Ok" but somehow the "Ok" button won't show. I'm quite new using LineairLayouts. I have a horizontal layout in an vertical one.
What the dialog shows:
What I want the dialog to show:
<?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"
android:padding="5dp"
android:background="#color/colorLightBlue"
android:onClick="selectOtherCardsButtonClick">
<TextView
android:id="#+id/finishedTextView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginStart="16dp"
android:layout_marginTop="16dp"
android:layout_marginEnd="16dp"
android:fontFamily="#font/patrickhand_regular"
android:text="#string/finishedCards"
android:textColor="#color/colorWhite"
android:textSize="20sp"
android:textStyle="bold"
app:layout_constraintBottom_toTopOf="#+id/selectOtherButton"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:padding="5dp">
<Button
android:id="#+id/selectOtherButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginEnd="16dp"
android:layout_marginTop="16dp"
android:layout_marginBottom="16dp"
android:background="#drawable/button_background"
android:text="#string/selectOtherCards"
android:textColor="#color/colorWhite"
android:textSize="20sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="#+id/okButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginEnd="16dp"
android:layout_marginTop="16dp"
android:layout_marginBottom="16dp"
android:background="#drawable/button_background"
android:text="#string/ok"
android:textColor="#color/colorWhite"
android:textSize="20sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="#+id/selectOtherButton"
app:layout_constraintTop_toTopOf="parent" />
</LinearLayout>
</LinearLayout>
I hope anyone knows what my problem is.
Thankyou for helping!

Probably selectOtherButton covers all the horizontal space and the okButton is under selectOtherButton.
Define weights for the space that will cover each button, something like 4 to 1 (or adjust it to suit your design) with the android:layout_weight attribute for both buttons:
<Button
android:id="#+id/selectOtherButton"
android:layout_weight="4"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginEnd="16dp"
android:layout_marginTop="16dp"
android:layout_marginBottom="16dp"
android:background="#drawable/button_background"
android:text="#string/selectOtherCards"
android:textColor="#color/colorWhite"
android:textSize="20sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="#+id/okButton"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginEnd="16dp"
android:layout_marginTop="16dp"
android:layout_marginBottom="16dp"
android:background="#drawable/button_background"
android:text="#string/ok"
android:textColor="#color/colorWhite"
android:textSize="20sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="#+id/selectOtherButton"
app:layout_constraintTop_toTopOf="parent" />

Try to lower your text size for example try with:
android:textSize="14sp"
or use less words like: select others. Weight might convert the button to two rows. And it might not look good in the end.

How to use constraint layout so the card views are always in one place?

I am using a constraint layout and card views in it, but on different screen sizes the card views are not in the same place. I thought the idea of constraint is that you only have to arrange the card view for one time and it automatically aligns to the different device sizes. The first picture shows the screen I want to have on every device size and the other picture shows you the result of a different size where the CardViews are obviously not in the right place.
I already tried using guidelines but it doesn't help. Or is it better to use another Layout like RelativeLayout? But what's then the point of a ConstraintLayout?
Design as it should be
Result with different size
Thank you for your help!
Here is my 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"
tools:context=".spielen_uebersicht">
<TextView
android:id="#+id/spieler_suche"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="4dp"
android:text="Spieler suchen:"
android:textSize="20sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.484"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<androidx.cardview.widget.CardView
android:id="#+id/cardView3"
android:layout_width="match_parent"
android:layout_height="55dp"
android:layout_margin="8dp"
android:layout_marginStart="8dp"
android:layout_marginEnd="8dp"
android:foreground="?android:attr/selectableItemBackground"
app:cardCornerRadius="20dp"
app:cardElevation="7dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#id/spieler_suche">
<SearchView
android:id="#+id/searchView_spieler_suchen"
android:layout_width="match_parent"
android:layout_height="50dp"
android:clickable="true"
android:focusable="true"
android:gravity="center"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:queryBackground="#android:color/transparent" />
</androidx.cardview.widget.CardView>
<androidx.cardview.widget.CardView
android:id="#+id/zufälliger_spieler"
android:layout_width="150dp"
android:layout_height="150dp"
android:layout_marginStart="36dp"
android:layout_marginTop="8dp"
android:layout_marginBottom="8dp"
android:clickable="true"
android:focusable="true"
android:foreground="?android:attr/selectableItemBackground"
app:cardCornerRadius="20dp"
app:cardElevation="7dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/cardView3"
app:layout_constraintVertical_bias="0.198">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="5dp"
android:text="Zufälliger Spieler"
android:textAlignment="center"
android:textSize="20sp" />
<ImageView
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_gravity="center"
android:layout_marginTop="25dp"
android:src="#mipmap/zufaelliger_spieler" />
</androidx.cardview.widget.CardView>
<androidx.cardview.widget.CardView
android:id="#+id/cardView"
android:layout_width="150dp"
android:layout_height="150dp"
android:layout_marginStart="32dp"
android:layout_marginTop="8dp"
android:clickable="true"
android:focusable="true"
android:foreground="?android:attr/selectableItemBackground"
app:cardCornerRadius="20dp"
app:cardElevation="7dp"
app:layout_constraintBottom_toBottomOf="#+id/zufälliger_spieler"
app:layout_constraintStart_toEndOf="#+id/zufälliger_spieler"
app:layout_constraintTop_toBottomOf="#+id/cardView3"
app:layout_constraintVertical_bias="1.0">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="5dp"
android:text="Freunde einladen"
android:textAlignment="center"
android:textSize="20sp" />
<ImageView
android:id="#+id/imageView"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_gravity="center"
android:layout_marginTop="25dp"
android:src="#mipmap/freunde_einladen" />
</androidx.cardview.widget.CardView>
<androidx.cardview.widget.CardView
android:id="#+id/cardViewFreundesübersicht"
android:layout_width="150dp"
android:layout_height="150dp"
android:layout_marginStart="32dp"
android:layout_marginTop="36dp"
android:clickable="true"
android:focusable="true"
android:foreground="?android:attr/selectableItemBackground"
app:cardCornerRadius="20dp"
app:cardElevation="7dp"
app:layout_constraintStart_toEndOf="#+id/cardView2"
app:layout_constraintTop_toBottomOf="#+id/cardView">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_marginTop="5dp"
android:text="Freundes-\nübersicht"
android:textAlignment="center"
android:textSize="20sp" />
<ImageView
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_gravity="center"
android:layout_marginTop="25dp"
android:src="#mipmap/freundes_uebersicht" />
</androidx.cardview.widget.CardView>
<androidx.cardview.widget.CardView
android:id="#+id/cardView2"
android:layout_width="150dp"
android:layout_height="150dp"
android:layout_marginStart="36dp"
android:layout_marginTop="36dp"
android:clickable="true"
android:focusable="true"
android:foreground="?android:attr/selectableItemBackground"
app:cardCornerRadius="20dp"
app:cardElevation="7dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/zufälliger_spieler">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_marginTop="5dp"
android:text="Anfragen"
android:textAlignment="center"
android:textSize="20sp" />
<ImageView
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_gravity="center"
android:layout_marginTop="25dp"
android:src="#mipmap/freundes_anfragen" />
</androidx.cardview.widget.CardView>
</androidx.constraintlayout.widget.ConstraintLayout>```

You don't see your layout the same way on different phones because your cardviews dimensions are a fixed size , why is it bad?
Different phones got different screen size, in your layout you are using fixed size on your view (fixed size is 50dp for example) and the result is that what may look good on one screen (your android studio preview screen) will not look good on another screen (your actual phone).
How to fix it:
You can just use app:layout_constraintWidth_percent and app:layout_constraintHeight_percent on your cardviews to give the size in precents according to the screen.
Something like 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"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id="#+id/button7"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginStart="8dp"
android:layout_marginEnd="8dp"
android:text="Button"
app:layout_constraintDimensionRatio="1:1"
app:layout_constraintWidth_percent=".5"
app:layout_constraintHeight_percent=".5"
app:layout_constraintBottom_toTopOf="#+id/button3"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="#+id/guideline"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="#+id/button"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginStart="8dp"
android:layout_marginEnd="8dp"
android:text="Button"
app:layout_constraintDimensionRatio="1:1"
app:layout_constraintWidth_percent=".5"
app:layout_constraintHeight_percent=".5"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="#+id/guideline"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/button2" />
<Button
android:id="#+id/button2"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginStart="8dp"
android:layout_marginEnd="8dp"
android:text="Button"
app:layout_constraintDimensionRatio="1:1"
app:layout_constraintWidth_percent=".5"
app:layout_constraintHeight_percent=".5"
app:layout_constraintBottom_toTopOf="#+id/button"
app:layout_constraintEnd_toStartOf="#+id/guideline"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="#+id/button3"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginStart="8dp"
android:layout_marginEnd="8dp"
android:text="Button"
app:layout_constraintDimensionRatio="1:1"
app:layout_constraintWidth_percent=".5"
app:layout_constraintHeight_percent=".5"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="#+id/guideline"
app:layout_constraintTop_toBottomOf="#+id/button7" />
<androidx.constraintlayout.widget.Guideline
android:id="#+id/guideline"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_begin="20dp"
app:layout_constraintGuide_percent=".5" />
</androidx.constraintlayout.widget.ConstraintLayout>
In this example, I have 4 buttons that represent your cardViews.
They are all equal in size and will be responsive to all screen sizes.
This layout will look like this (the arrow points to the guideline, to make it more understandable):

For Future Visitors, Chains are the magical word when trying to simulate Linear layout form. using horizontal chains with vertical ones along with using dynamic View sizes as Tamir Abutbul mentioned should be the best practice.
<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">
<TextView
android:id="#+id/textView24"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="32dp"
android:gravity="center"
android:text="Title"
android:textColor="#android:color/black"
android:textSize="?android:attr/actionBarSize"
android:textStyle="bold"
app:layout_constraintTop_toTopOf="parent" />
<com.google.android.material.button.MaterialButton
android:id="#+id/btn1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:drawableBottom="#android:drawable/ic_media_play"
android:text="text 4"
android:textSize="24sp"
android:padding="50dp"
android:textStyle="bold"
app:layout_constraintBottom_toBottomOf="#+id/btn3"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toEndOf="#+id/btn3"
app:layout_constraintTop_toTopOf="#+id/btn3" />
<com.google.android.material.button.MaterialButton
android:id="#+id/btn2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:drawableBottom="#android:drawable/ic_media_play"
android:text="text 2"
android:textStyle="bold"
android:textSize="24sp"
android:padding="50dp"
app:layout_constraintBottom_toBottomOf="#+id/btn4"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toEndOf="#+id/btn4"
app:layout_constraintTop_toTopOf="#+id/btn4" />
<com.google.android.material.button.MaterialButton
android:id="#+id/btn3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:drawableBottom="#android:drawable/ic_media_play"
android:text="text 3"
android:textStyle="bold"
android:textSize="24sp"
android:padding="50dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="#+id/btn4"
app:layout_constraintEnd_toStartOf="#+id/btn1"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/btn4" />
<com.google.android.material.button.MaterialButton
android:id="#+id/btn4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:drawableBottom="#android:drawable/ic_media_play"
android:text="text 1"
android:textStyle="bold"
android:textSize="24sp"
android:padding="50dp"
app:layout_constraintBottom_toTopOf="#+id/btn3"
app:layout_constraintEnd_toStartOf="#+id/btn2"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/textView24"/></androidx.constraintlayout.widget.ConstraintLayout>
Best of luck ;)

ScrollView doesn't entirely scroll with Constraint Layout

I have an app that displays long strings of text with the press of some buttons, the problem comes when I display a lot of text and the ScrollView just stops scrolling for some reason.
Here is the xml of my app:
<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">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<TextView
android:id="#+id/textView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="14dp"
android:layout_marginStart="16dp"
android:layout_marginTop="128dp"
android:text=""
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintEnd_toStartOf="#+id/atbutt"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.089" />
</ScrollView>
<Button
android:id="#+id/namebutt"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginEnd="12dp"
android:layout_marginStart="16dp"
android:layout_marginTop="16dp"
android:onClick="changename"
android:text="Name"
app:layout_constraintEnd_toStartOf="#+id/titlebutt"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="#+id/titlebutt"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginEnd="16dp"
android:layout_marginTop="16dp"
android:onClick="changetitle"
android:text="Title"
app:layout_constraintEnd_toStartOf="#+id/descbutt"
app:layout_constraintStart_toEndOf="#+id/namebutt"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="#+id/descbutt"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginEnd="16dp"
android:layout_marginTop="16dp"
android:onClick="changedesc"
android:text="Description"
android:textSize="13dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="#+id/titlebutt"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="#+id/urlbutt"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginEnd="11dp"
android:layout_marginStart="16dp"
android:layout_marginTop="20dp"
android:onClick="changeurl"
android:text="Url"
app:layout_constraintEnd_toStartOf="#+id/atbutt"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/namebutt" />
<Button
android:id="#+id/atbutt"
android:layout_width="0dp"
android:layout_height="48dp"
android:layout_marginEnd="14dp"
android:layout_marginTop="20dp"
android:onClick="changeat"
android:text="Publish Date"
android:textSize="12dp"
app:layout_constraintEnd_toStartOf="#+id/contbutt"
app:layout_constraintStart_toEndOf="#+id/urlbutt"
app:layout_constraintTop_toBottomOf="#+id/titlebutt" />
<Button
android:id="#+id/contbutt"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginEnd="17dp"
android:onClick="changecont"
android:text="Content"
app:layout_constraintBottom_toBottomOf="#+id/atbutt"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="#+id/atbutt"
app:layout_constraintTop_toTopOf="#+id/atbutt"
app:layout_constraintVertical_bias="0.0" />
</android.support.constraint.ConstraintLayout>
I have seen some people use this same method that I'm using here and it works for them just fine.

Your layout has a few things that look wrong and could explain
undefined behaviour.
change the ScrollView height and width to 0dp which means to respect the constraints set on the view
<ScrollView
android:layout_width="0dp"
android:layout_height="0dp"
...
Remove the constraints from the child of the ScrollView as ContraintLayout only applies rules to direct children.
<TextView
android:id="#+id/textView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="14dp"
android:layout_marginStart="16dp"
android:layout_marginTop="128dp"
android:text=""
/>

NestedScrollView Having Constraint Layout not scrolling

My xml is composed by one constraint layout. Inside this there are 2 buttons and 1 nested scroll view. Inside the ScrollView there are various elements including recycle view. I would like that the recycle view not scroll but scroll only the nested scroll view. I have disabled the scroll of recycle view in this mode
(recyclerView.setNestedScrollingEnabled(false);)
but the problem is that the nested scroll view not scrolling. Can you help me?
I attach the code below.
The code start in this mode :
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<TextView
android:id="#+id/azzera"
android:layout_width="120dp"
android:layout_height="40dp"
android:layout_marginStart="40dp"
android:layout_marginBottom="28dp"
android:background="#drawable/rounded_4lati"
android:backgroundTint="#color/azzurro"
android:elevation="#dimen/dimen8"
android:paddingTop="#dimen/dimen8"
android:text="#string/azzera"
android:textAlignment="center"
android:textColor="#FFFFFF"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent" />
<TextView
android:id="#+id/conferma"
android:layout_width="120dp"
android:layout_height="40dp"
android:layout_marginEnd="16dp"
android:layout_marginBottom="28dp"
android:background="#drawable/rounded_4lati"
android:backgroundTint="#color/azzurro"
android:paddingTop="#dimen/dimen8"
android:text="#string/conferma"
android:textAlignment="center"
android:textColor="#FFFFFF"
android:elevation="#dimen/dimen8"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent" />
<android.support.v4.widget.NestedScrollView 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:fillViewport="true"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
>
<android.support.constraint.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<View
android:id="#+id/view1"
android:layout_width="0dp"
android:layout_height="48dp"
android:background="#color/white"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<View
android:id="#+id/view2"
android:layout_width="0dp"
android:layout_height="48dp"
android:layout_marginTop="16dp"
android:background="#color/white"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#id/view1" />
<View
android:id="#+id/view3"
android:layout_width="0dp"
android:layout_height="48dp"
android:layout_marginTop="16dp"
android:background="#color/white"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#id/view2" />
<TextView
android:id="#+id/mostraPreferiti"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginTop="8dp"
android:text="#string/mostraPreferiti"
android:textColor="#color/black"
android:textSize="18sp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="#+id/view3" />
<TextView
android:id="#+id/creditiEcm"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginTop="10dp"
android:text="#string/creditiECM"
android:textColor="#color/black"
android:textSize="18sp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="#+id/view1" />
<EditText
android:id="#+id/editText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:inputType="number"
android:hint="#string/zero"
android:text="#string/editText"
android:textStyle="bold"
app:layout_constraintStart_toEndOf="#+id/creditiEcm"
app:layout_constraintTop_toTopOf="#+id/view1"
android:autofillHints="" />
<Button
android:id="#+id/buttonMeno"
android:layout_width="36dp"
android:layout_height="36dp"
android:layout_marginTop="6dp"
android:layout_marginEnd="16dp"
android:background="#drawable/ic_remove_circle_azzurro_24dp"
android:gravity="center"
android:textAlignment="gravity"
android:textColor="#color/azzurro"
android:textSize="24sp"
app:layout_constraintEnd_toStartOf="#+id/buttonPiu"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="#+id/buttonPiu"
android:layout_width="36dp"
android:layout_height="36dp"
android:layout_marginTop="6dp"
android:layout_marginEnd="32dp"
android:background="#drawable/ic_add_circle_azzurro_24dp"
android:gravity="center"
android:textAlignment="gravity"
android:textColor="#color/azzurro"
android:textSize="24sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/mostraCorsiPassati"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:text="#string/mostraCorsiPassati"
android:textColor="#color/black"
android:textSize="18sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="#+id/view2"
app:layout_constraintTop_toTopOf="#+id/view2" />
<Switch
android:id="#+id/switch_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:layout_marginEnd="32dp"
android:theme="#style/SwitchTheme"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="#+id/view2" />
<Switch
android:id="#+id/switch_button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:layout_marginEnd="32dp"
android:theme="#style/SwitchTheme"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="#+id/view3" />
<android.support.v7.widget.AppCompatTextView
android:id="#+id/professioni"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginTop="90dp"
android:layout_marginEnd="8dp"
android:text="#string/professione2"
android:textColor="#color/black"
android:textSize="18sp"
android:textStyle="bold"
app:fontFamily="#font/sanfrancisco"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/mostraCorsiPassati" />
<SearchView
android:id="#+id/searchBar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="4dp"
android:background="#fff"
android:elevation="2dp"
app:layout_constraintHorizontal_bias="0.557"
app:layout_constraintLeft_toRightOf="parent"
app:layout_constraintRight_toLeftOf="parent"
app:layout_constraintTop_toBottomOf="#+id/professioni"
app:queryHint="Cerca..">
</SearchView>
<android.support.v7.widget.RecyclerView
android:id="#+id/listProfessioni"
android:layout_width="match_parent"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/searchBar"
android:orientation="vertical"
>
</android.support.v7.widget.RecyclerView>
<TextView
android:id="#+id/professioniNonDisponibili"
android:layout_width="match_parent"
android:layout_height="60dp"
android:layout_marginStart="8dp"
android:layout_marginTop="16dp"
android:layout_marginEnd="8dp"
android:text="#string/professioniNonDisponibili"
android:textAlignment="center"
android:textColor="#color/gray"
android:textSize="18sp"
app:autoSizeMaxTextSize="#dimen/dimen20"
app:autoSizeMinTextSize="#dimen/dimen12"
app:autoSizeTextType="uniform"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/error" />
<ImageView
android:id="#+id/error"
android:layout_width="#dimen/dimen80"
android:layout_height="#dimen/dimen80"
android:layout_marginStart="8dp"
android:layout_marginTop="32dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:background="#drawable/ic_error_outline_gray_24dp"
android:contentDescription="#string/TODO"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="#+id/searchBar"
app:layout_constraintVertical_bias="0.105" />
<ProgressBar
android:id="#+id/progress"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_marginStart="8dp"
android:layout_marginTop="24dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:alpha="1"
android:minWidth="80dp"
android:minHeight="80dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="#+id/searchBar"
app:layout_constraintVertical_bias="0.168" />
</android.support.constraint.ConstraintLayout>
</android.support.v4.widget.NestedScrollView>

As i answered in comments
For Someone other facing same problem. This might help.
For some reasons ScrollView doesn't scroll when having ConstraintLayout inside it.
For Workaround we can use LinearLayout or RelativeLayoutinstead of ConstraintLayout inside ScrollView. OR
As OP does put the ConstraintLayout inside Linear or Relative Layout does the trick.

According to Ali Ahmed's answer, a ScrollView doesn't scroll if you have a ConstraintLayout inside it. Well that's not true. I have been using ConstraintLayout inside ScrollView and everything works perfectly fine. Well the problem with the code that you posted is that you are using 0dpas the layout_height of your RecyclerView. 0dp means match_parent. You should be using wrap_content as your layout_height. So that the RecyclerView expands its height according to the elements in it. Doing so will make your code work fine.

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