Layout in fragment not centering - android

I'm building my first proper application for Android. I wish to use the Navigation Drawer Activity to switch between screens and options. So far so good. All working great. But my layouts that load in the content are not aligned properly. See pictures
I have tried to change the layout_width and layout_height to fill_parent, match_parent and wrap_content in all combinations. Also tried adding the gravity center and vertical gravity but so far i have failed.
content layout:
<?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"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:showIn="#layout/app_bar_main_menu"
tools:context=".MainMenu">
<RelativeLayout
android:id="#+id/relativeLayout"
android:layout_width="wrap_content"
android:layout_height="match_parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
the content im trying to put in the content layout:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" tools:layout_editor_absoluteY="81dp">
<ImageView
android:layout_width="34dp"
android:layout_height="34dp" app:srcCompat="#drawable/fragment_client_add_address"
android:id="#+id/imageView10"
app:layout_constraintEnd_toStartOf="#+id/editText10"
android:layout_marginEnd="12dp" android:layout_marginTop="8dp"
app:layout_constraintTop_toTopOf="#+id/editText10"/>
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="textPersonName"
android:hint="Kontakt broj"
android:ems="10"
android:id="#+id/editText9"
app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent"
android:layout_marginTop="24dp" app:layout_constraintTop_toBottomOf="#+id/editText11"/>
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="textPersonName"
android:hint="Adresa"
android:ems="10"
android:id="#+id/editText10"
app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent"
android:layout_marginTop="24dp" app:layout_constraintTop_toBottomOf="#+id/editText9"/>
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="textPersonName"
android:hint="Naziv klijenta"
android:ems="10"
android:id="#+id/editText11" android:layout_marginEnd="8dp"
app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent"
android:layout_marginTop="64dp" app:layout_constraintTop_toTopOf="parent"
app:layout_constraintHorizontal_bias="0.518"/>
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="textPersonName"
android:hint="E-Mail"
android:ems="10"
android:id="#+id/editText12"
app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent"
android:layout_marginTop="24dp" app:layout_constraintTop_toBottomOf="#+id/editText10"/>
<ImageView
android:layout_width="34dp"
android:layout_height="34dp" app:srcCompat="#drawable/round_person_black_48"
android:id="#+id/imageView11"
android:layout_marginTop="8dp"
app:layout_constraintTop_toTopOf="#+id/editText11" app:layout_constraintEnd_toStartOf="#+id/editText11"
android:layout_marginEnd="12dp"/>
<ImageView
android:layout_width="34dp"
android:layout_height="34dp" app:srcCompat="#drawable/round_call_black_48"
android:id="#+id/imageView12"
android:layout_marginTop="8dp"
app:layout_constraintTop_toTopOf="#+id/editText9" app:layout_constraintEnd_toStartOf="#+id/editText9"
android:layout_marginEnd="12dp"/>
<ImageView
android:layout_width="34dp"
android:layout_height="34dp" app:srcCompat="#drawable/fragment_client_add_email"
android:id="#+id/imageView13"
android:layout_marginTop="8dp"
app:layout_constraintTop_toTopOf="#+id/editText12" app:layout_constraintEnd_toStartOf="#+id/editText12"
android:layout_marginEnd="12dp"/>
<Spinner
android:layout_width="0dp"
android:layout_height="wrap_content"
android:id="#+id/spinner"
android:layout_marginTop="24dp"
app:layout_constraintTop_toBottomOf="#+id/editText12" app:layout_constraintStart_toStartOf="#+id/editText12"
app:layout_constraintEnd_toEndOf="#+id/editText12" android:entries="#array/clientType"
/>
<Spinner
android:layout_width="0dp"
android:layout_height="wrap_content"
android:id="#+id/spinner2" app:layout_constraintStart_toStartOf="#+id/spinner"
app:layout_constraintEnd_toEndOf="#+id/spinner" android:entries="#array/clientContract"
app:layout_constraintTop_toBottomOf="#+id/spinner" android:layout_marginTop="32dp"/>
<Button
android:text="#string/button_genericConfirm"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:id="#+id/button" android:layout_marginBottom="32dp"
app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintStart_toStartOf="parent"
android:layout_marginStart="128dp" app:layout_constraintEnd_toEndOf="parent"
android:layout_marginEnd="128dp" android:layout_marginTop="8dp"
app:layout_constraintTop_toBottomOf="#+id/spinner2" app:layout_constraintVertical_bias="1.0"/>
</androidx.constraintlayout.widget.ConstraintLayout>
This is what i expect it to look like:
But in reality this is what it looks like:


The issue in your RelativeLayout inside your content layout
You need to chnage the width of your RelativeLayout to android:layout_width="match_parent" in your content layout
Try this
<?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"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:showIn="#layout/app_bar_main_menu"
tools:context=".MainMenu">
<RelativeLayout
android:id="#+id/relativeLayout"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</androidx.constraintlayout.widget.ConstraintLayout>


The problem is not with your fragment layout implementation, I just tried in an activity and it is worked properly.
I would say to change the content layout to FrameLayout, which is often used to hold the fragments, more information can be found here :Why is a FrameLayout used for fragments?
The frame layout instead of relative layout should be
<FrameLayout
android:id="#+id/relativeLayout"
android:layout_width="match_parent"
android:layout_height="match_parent" />
Just left the id as relativeLayout, but feel free to change it.
Also, if you have such a problem, you can always use the layout inspector, it is in the tools menu, give it a try. Or you can just play with background colors, to check the layout sizes, just like back in time, before layout inspector.


It is always good to use drawablestart instead of imageview in all edit text
Please find below xml may it will be helpful
<?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">
<EditText
android:id="#+id/editText11"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="64dp"
android:layout_marginEnd="8dp"
android:drawableStart="#mipmap/ic_launcher"
android:ems="10"
android:hint="Naziv klijenta"
android:inputType="textPersonName"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.518"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<EditText
android:id="#+id/editText9"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="24dp"
android:drawableStart="#mipmap/ic_launcher"
android:ems="10"
android:hint="Kontakt broj"
android:inputType="textPersonName"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/editText11" />
<EditText
android:id="#+id/editText10"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="24dp"
android:drawableStart="#mipmap/ic_launcher"
android:ems="10"
android:hint="Adresa"
android:inputType="textPersonName"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/editText9" />
<EditText
android:id="#+id/editText12"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="24dp"
android:drawableStart="#mipmap/ic_launcher"
android:ems="10"
android:hint="E-Mail"
android:inputType="textPersonName"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/editText10" />
<Spinner
android:id="#+id/spinner"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="24dp"
android:entries="#mipmap/ic_launcher"
app:layout_constraintEnd_toEndOf="#+id/editText12"
app:layout_constraintStart_toStartOf="#+id/editText12"
app:layout_constraintTop_toBottomOf="#+id/editText12" />
<Spinner
android:id="#+id/spinner2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="32dp"
android:entries="#mipmap/ic_launcher"
app:layout_constraintEnd_toEndOf="#+id/spinner"
app:layout_constraintStart_toStartOf="#+id/spinner"
app:layout_constraintTop_toBottomOf="#+id/spinner" />
<Button
android:id="#+id/button"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="128dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="128dp"
android:layout_marginBottom="32dp"
android:text="xxxx"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/spinner2"
app:layout_constraintVertical_bias="1.0" />
</androidx.constraintlayout.widget.ConstraintLayout>
In case you want specific size for your imageview in left use below code
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android"
>
<item
android:drawable="#drawable/icon"
android:width="#dimen/icon_size"
android:height="#dimen/icon_size"
/>
</layer-list >


Use FrameLayout instead of relative layout and finally remove the line from parent constraint layout..
tools:layout_editor_absoluteY="81dp"


try to use like below
<?xml version="1.0" encoding="utf-8"?>
<androidx.appcompat.widget.LinearLayoutCompat
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_gravity="center_vertical"
android:gravity="center_vertical"
android:layout_height="match_parent">
<ImageView
android:layout_width="34dp"
android:layout_height="34dp"
app:srcCompat="#drawable/fragment_client_add_address"
android:id="#+id/imageView10"
android:layout_marginEnd="12dp"
android:layout_marginTop="8dp"/>
</androidx.appcompat.widget.LinearLayoutCompat>
And for content main
<androidx.appcompat.widget.LinearLayoutCompat
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<FrameLayout
android:id="#+id/frame_container"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</androidx.appcompat.widget.LinearLayoutCompat>


You can use the property app:layout_constraintVertical_bias so that it is biased equally to parent. This can also be achieved in layout editor by constraining all 4 sides of the layout to parent.

Related

Bottom of one layout in the middle of another layout vertically in android xml?

I want to create the below layout, but not sure how to do it.
height of both blue layout and white layout is set to "wrap_content" and therefor they don't have a constant height.
The point is, I want the bottom of blue layout to always be in the middle of white layout(vertically). I have no idea how to do it using constraint or relative layout.
I searched but couldn't find any solution to this problem.

modify this accordingly
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools">
<androidx.constraintlayout.widget.ConstraintLayout
android:id="#+id/credentials_card"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_marginTop="20dp"
android:padding="#dimen/spacing_mlarge"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="#+id/image_logo">
<androidx.cardview.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="#dimen/spacing_medium"
android:visibility="visible"
app:cardBackgroundColor="#color/white"
app:cardCornerRadius="6dp"
app:cardElevation="5dp"
app:cardUseCompatPadding="true"
tools:ignore="MissingConstraints">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:padding="#dimen/spacing_xmlarge">
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_marginBottom="25dp"
android:fontFamily="#string/font_family_light"
android:text="L O G I N"
android:textAppearance="#style/Base.TextAppearance.AppCompat.Large"
android:textColor="#color/colorPrimary"
android:textStyle="bold" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="MOBILE"
android:textAlignment="center"
android:textAppearance="#style/Base.TextAppearance.AppCompat.Caption"
android:textColor="#color/colorPrimary" />
<com.google.android.material.textfield.TextInputEditText
android:id="#+id/mobileNumberET"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="number"
android:maxLength="10"
android:maxLines="1"
android:singleLine="true"
android:textAppearance="#style/Base.TextAppearance.AppCompat.Large"
android:textColor="#color/colorPrimary"
android:textStyle="bold" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:text="PASSWORD"
android:textAlignment="center"
android:textAppearance="#style/Base.TextAppearance.AppCompat.Caption"
android:textColor="#color/colorPrimary" />
<com.google.android.material.textfield.TextInputEditText
android:id="#+id/passwordET"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textPassword"
android:maxLength="50"
android:maxLines="1"
android:singleLine="true"
android:textAppearance="#style/Base.TextAppearance.AppCompat.Large"
android:textColor="#color/colorPrimary"
android:textStyle="bold" />
</LinearLayout>
</androidx.cardview.widget.CardView>
</androidx.constraintlayout.widget.ConstraintLayout>
<Button
android:id="#+id/loginButton"
android:layout_width="match_parent"
android:layout_height="57dp"
android:layout_marginLeft="50dp"
android:layout_marginRight="50dp"
android:background="#drawable/button_round"
android:text="L O G I N"
android:fontFamily="#string/font_family_light"
android:textAllCaps="false"
android:textColor="#android:color/white"
android:textStyle="bold"
app:layout_constraintBottom_toBottomOf="#+id/credentials_card"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

You can try this (I don't include border radius so take care of it..)
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.constraintlayout.widget.ConstraintLayout
android:id="#+id/constraintLayout"
android:layout_width="match_parent"
android:layout_height="250dp"
android:background="#8F2A2A"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="70dp"
android:layout_marginStart="50dp"
android:layout_marginEnd="50dp"
android:layout_marginTop="200dp"
android:background="#B8C159"
app:layout_constraintTop_toTopOf="#+id/constraintLayout" />
</androidx.constraintlayout.widget.ConstraintLayout>

Here My Ans check
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.cardview.widget.CardView
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_marginLeft="#dimen/dp_16"
android:layout_marginRight="#dimen/dp_16"
app:cardBackgroundColor="#color/blue"
app:cardCornerRadius="#dimen/dp_10"
app:cardElevation="#dimen/dp_5"
app:cardUseCompatPadding="true"
android:id="#+id/card_container"
app:layout_constraintBottom_toBottomOf="#id/guideline"
app:layout_constraintTop_toTopOf="parent">
</androidx.cardview.widget.CardView>
<androidx.constraintlayout.widget.Guideline
android:id="#+id/guideline"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_percent="0.42" />
<androidx.cardview.widget.CardView
android:layout_width="0dp"
android:layout_height="100dp"
app:cardBackgroundColor="#color/white"
app:cardCornerRadius="#dimen/dp_10"
app:cardElevation="#dimen/dp_5"
app:cardUseCompatPadding="true"
android:layout_marginStart="#dimen/dp_20"
android:layout_marginEnd="#dimen/dp_20"
app:layout_constraintStart_toStartOf="#id/card_container"
app:layout_constraintEnd_toEndOf="#id/card_container"
app:layout_constraintTop_toTopOf="#id/guideline"
app:layout_constraintBottom_toTopOf="#id/guideline">
</androidx.cardview.widget.CardView>
</androidx.constraintlayout.widget.ConstraintLayout>

Use constraint layout as parent and then constraint the topOfSmallComponent to the bottomOfBigComponent. Then again constraint the bottomOfSmallComponent to the bottomOf BigComponent.
Example code below:
app:layout_constraintTop_toBottomOf="your_blue_items_id"
app:layout_constraintBottom_toBottomOf="your_blue_items_id"

Android Constraint layout, views with weight?

So like the picture below, I want view B be twice the length of view A.
What I exactly need is view A sticks to the left edge, view B sticks to the right edge and they stick to each other in between. And in the length, the B is going to be twice the length of A. I tried a lot, but no luck! in the end, something is not what I want. Either there is unwanted space between a view and its according edge or between the two views.
Here is my last try:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="10dp"
tools:context=".MainActivity">
<EditText
android:id="#+id/editText"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:layout_marginTop="36dp"
android:ems="10"
android:text="B"
android:inputType="textPersonName"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_weight="2"
app:layout_constraintStart_toEndOf="#+id/textView"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:layout_marginTop="36dp"
android:gravity="center"
android:text="A"
app:layout_constraintHorizontal_weight="1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>

You can use app:layout_constraintWidth_percent ti tell your view how to spread on the screen.
For your wanted look you can use it like this:
<?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"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id="#+id/button"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="Button"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="#+id/button2"
app:layout_constraintWidth_percent=".33"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="#+id/button2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="Button"
app:layout_constraintBottom_toBottomOf="#+id/button"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintWidth_percent=".66"
app:layout_constraintStart_toEndOf="#+id/button"
app:layout_constraintTop_toTopOf="#+id/button" />
</android.support.constraint.ConstraintLayout>
It will look like this

To use layout_constraintHorizontal_weight, you have to put your Views in a chain first. That means you have to constraint both Views to each other and the parent horizontally. What you are missing in your case is the app:layout_constraintEnd_toStartOf="#id/editText" on the TextView. You also need to change the android:layout_width of both Views to 0dp so that the weight is enforced:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="10dp"
tools:context=".MainActivity">
<EditText
android:id="#+id/editText"
android:layout_width="0dp"
android:layout_height="50dp"
android:layout_marginTop="36dp"
android:ems="10"
android:text="B"
android:inputType="textPersonName"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_weight="2"
app:layout_constraintStart_toEndOf="#+id/textView"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/textView"
android:layout_width="0dp"
android:layout_height="50dp"
android:layout_marginTop="36dp"
android:gravity="center"
android:text="A"
app:layout_constraintHorizontal_weight="1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toStartOf="#id/editText"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>

Wrong app display on both physical and virtual device

I tried on both emulator and physical device ,with different layouts, but app shows only about sixty percent of layout,like its exceeding the visible screen and some component goes under.
I tried to use a scroll view,but no success.
<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="#242323"
tools:context=".MainActivity">
<RelativeLayout
android:layout_width="395dp"
android:layout_height="715dp"
tools:layout_editor_absoluteX="8dp"
tools:layout_editor_absoluteY="8dp">
<EditText
android:id="#+id/edittext"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:hint="blah blah"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
/>
<Button
android:id="#+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="press"
android:layout_centerHorizontal="true"
android:layout_below="#id/edittext"
/>
</RelativeLayout>
</androidx.constraintlayout.widget.ConstraintLayout>

In your code,try to change this:
from
<RelativeLayout
android:layout_width="395dp"
android:layout_height="715dp"
tools:layout_editor_absoluteX="8dp"
tools:layout_editor_absoluteY="8dp">
to
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
tools:layout_editor_absoluteX="8dp"
tools:layout_editor_absoluteY="8dp">

When using constraint layout you need to link your views to some other view/boundry. In your case your RelativeLayout was not linked to parent, and you were using an extra Layout so remove the Constraint layout and use just Relative layout.
That will work.
Try the following xml
<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:background="#242323"
tools:context=".MainActivity">
<EditText
android:id="#+id/edittext"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:hint="blah blah"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
/>
<Button
android:id="#+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="press"
android:layout_centerHorizontal="true"
android:layout_below="#id/edittext"
/>
</RelativeLayout>

Remove the relative layout and just use constraint layout only. Note that your button and edittext have to be constrained to the parent view. Learn more about Constraint Layout at https://developer.android.com/reference/android/support/constraint/ConstraintLayout
Try the following xml
<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="#242323"
tools:context=".MainActivity">
<EditText
android:id="#+id/edittext"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:hint="blah blah"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="#+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/edittext"
android:layout_centerHorizontal="true"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:text="press"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/edittext" />
</androidx.constraintlayout.widget.ConstraintLayout>

ListView under constraint layout disappears in preview

Output png
So below is my xml for the activity:
I have migrated to androidx from support libraries.
Is there a way to achieve this?
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<AutoCompleteTextView
android:id="#+id/partyname"
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="#drawable/rounded_edittext"
android:layout_marginBottom="8dp"
android:layout_marginEnd="5dp"
android:layout_marginStart="5dp"
android:hint="#string/firm_name"
android:padding="5dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toTopOf="parent"/>
<LinearLayout
android:id="#+id/billform"
android:layout_marginTop="5dp"
android:layout_marginRight="5dp"
android:layout_marginEnd="5dp"
android:layout_marginStart="5dp"
android:layout_marginLeft="5dp"
android:layout_width="match_parent"
android:layout_height="0dp"
android:orientation="vertical"
android:background="#drawable/rounded_buttons"
app:layout_constraintTop_toBottomOf="#id/partyname">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<AutoCompleteTextView
android:id="#+id/identifier"
android:layout_height="50dp"
android:layout_width="0dp"
android:padding="5dp"
android:layout_marginEnd="8dp"
android:textSize="16sp"
android:textAllCaps="true"
android:hint="#string/code_article"
android:background="#drawable/rounded_edittext"
android:layout_marginRight="8dp"
android:layout_alignParentStart="true"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:layout_toLeftOf="#+id/add"
android:layout_toStartOf="#+id/add" />
<Button
android:id="#+id/add"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/rounded_buttons"
android:text="#string/add"
android:textAllCaps="true"
android:textSize="18sp"
android:layout_centerVertical="true"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true" />
</RelativeLayout>
</LinearLayout>
<ListView
android:layout_width="match_parent"
android:layout_height="0dp"
app:layout_constraintTop_toBottomOf="#id/billform"
app:layout_constraintBottom_toBottomOf="parent"/>
</androidx.constraintlayout.widget.ConstraintLayout>
For god knows why, the listView is not available in the preview.
It works when the root is linear layout. I tried creating a linear layout within the constraint layout, it didn't work

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

Try to remove the nested layouts.
Try the below code
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<AutoCompleteTextView
android:id="#+id/partyname"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_marginTop="24dp"
android:padding="5dp"
app:layout_constraintTop_toTopOf="parent"
tools:layout_editor_absoluteX="0dp" />
<AutoCompleteTextView
android:id="#+id/identifier"
android:layout_width="0dp"
android:layout_height="50dp"
android:layout_alignParentStart="true"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:layout_toStartOf="#+id/add"
android:layout_toLeftOf="#+id/add"
android:padding="5dp"
android:textAllCaps="true"
android:textSize="16sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/partyname" />
<Button
android:id="#+id/add"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:text="ADD"
android:textAllCaps="true"
android:textSize="18sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="#+id/identifier" />
<ListView
android:layout_width="match_parent"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toBottomOf="#+id/add" />

change the width from match_parent to 0dp and you can create left and right constraint.The following will work for you.
<ListView
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="#id/billform"
app:layout_constraintBottom_toBottomOf="parent"/>
Update
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:tools="http://schemas.android.com/tools">
<AutoCompleteTextView
android:id="#+id/partyname"
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="#drawable/rounded_edittext"
android:layout_marginBottom="8dp"
android:layout_marginEnd="5dp"
android:layout_marginStart="5dp"
android:hint="#string/firm_name"
android:padding="5dp"
app:layout_constraintTop_toTopOf="parent"/>
<AutoCompleteTextView
android:id="#+id/identifier"
android:layout_height="50dp"
android:layout_width="0dp"
android:padding="5dp"
android:textSize="16sp"
android:textAllCaps="true"
android:hint="#string/code_article"
android:background="#drawable/rounded_edittext"
android:layout_toStartOf="#+id/add"
app:layout_constraintEnd_toStartOf="#+id/add"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#id/partyname"/>
<Button
android:id="#+id/add"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:background="#drawable/rounded_buttons"
android:text="#string/add"
android:textAllCaps="true"
android:textSize="18sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="#+id/partyname"/>
<ListView
android:layout_width="0dp"
android:layout_height="0dp"
tools:listitem="Add items here"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="#id/add"
app:layout_constraintBottom_toBottomOf="parent"/>
</androidx.constraintlayout.widget.ConstraintLayout>

android scrollview not scrolling down after keyboard opens

I have a textview that is inside of a scrollview, it scrolls fine untill the soft keyboard is opened.
When the keyboard is opened it act like it scrolled up again with the height of the keyboard.
What I have tried
I tried this in the manifest, but yielded the exact same results
android:windowSoftInputMode="adjustResize"
Then this:
android:windowSoftInputMode="adjustPan"
That seemed to work, but the problem was that it was moving the whole screen up and taking the header out of view.
I also tried adding the following in the linear layout
android:focusable="true"
android:focusableInTouchMode="true"
That only caused the app not to focus on the input field (EditText) and the keyboard didn't open automatically, but when you clicked on the input field it would just act the same as before.
This is the XML file code:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/lightGray"
android:orientation="vertical" >
<ScrollView
android:id="#+id/scrollView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="#+id/bottom_layout"
android:layout_marginTop="10dip" >
<LinearLayout
android:id="#+id/msg_list_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
</LinearLayout>
</ScrollView>
<RelativeLayout
android:id="#+id/bottom_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:background="#android:color/background_light">
<Button
android:id="#+id/send_btn"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:text="#string/txt_send" />
<EditText
android:id="#+id/msg_edit"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignBottom="#+id/send_btn"
android:layout_toLeftOf="#+id/send_btn"
android:inputType="text" >
</EditText>
</RelativeLayout>
Any suggestions?

I had same problem and the solutions is this:
My activity was in fullscreen mode and scroll does not work in this mode this is a bug and we send a report to google.
Just look at your activity in manifest if there is a fullscreen mode just remove it.

I got this problem and it is a headache.
the soloution is instead of drawing an XML layout from the top of the screen, you need to draw it from the bottom of the screen.
look at these examples :
main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ScrollView
android:layout_width="0dp"
android:layout_height="match_parent"
android:fillViewport="true"
android:isScrollContainer="true"
android:orientation="vertical"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<include layout="#layout/main_contents"/>
</ScrollView>
</android.support.constraint.ConstraintLayout>
main_contents.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="20dp">
<android.support.constraint.Guideline
android:id="#+id/guideline"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_percent="0.92" />
<android.support.v7.widget.CardView
android:id="#+id/card1"
android:layout_width="0dp"
android:layout_height="250dp"
android:layout_margin="30dp"
android:padding="10dp"
app:cardCornerRadius="10dp"
app:layout_constraintBottom_toTopOf="#+id/guideline"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent">
<android.support.constraint.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/sam3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:text="sample"
android:textColor="#673AB7"
android:textSize="23sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<EditText
android:id="#+id/sam2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="right|center_vertical"
android:backgroundTint="#673AB7"
android:digits="0123456789"
android:gravity="center"
android:hint="sample"
android:inputType="phone"
android:maxLength="11"
android:maxLines="1"
android:nextFocusDown="#id/sam1"
android:textColor="#673AB7"
android:layout_marginStart="40dp"
android:layout_marginEnd="40dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/sam3"
app:layout_constraintVertical_bias="0.3"/>
</android.support.constraint.ConstraintLayout>
</android.support.v7.widget.CardView>
<Button
android:id="#+id/sam1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:textColor="#fff"
android:background="#673AB7"
android:text="sample"
android:layout_marginLeft="60dp"
android:layout_marginRight="60dp"
android:textSize="18sp"
app:layout_constraintBottom_toBottomOf="#+id/card1"
app:layout_constraintEnd_toEndOf="#+id/card1"
app:layout_constraintStart_toStartOf="#+id/card1"
app:layout_constraintTop_toBottomOf="#+id/card1" />
</android.support.constraint.ConstraintLayout>
main_contents2.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="20dp">
<android.support.constraint.Guideline
android:id="#+id/guideline"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_percent="0.45" />
<android.support.v7.widget.CardView
android:id="#+id/card1"
android:layout_width="0dp"
android:layout_height="250dp"
android:layout_margin="30dp"
android:padding="10dp"
app:cardCornerRadius="10dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="#+id/guideline">
<android.support.constraint.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<EditText
android:id="#+id/sam2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="right|center_vertical"
android:layout_marginStart="40dp"
android:layout_marginEnd="40dp"
android:backgroundTint="#673AB7"
android:digits="0123456789"
android:gravity="center"
android:hint="sample"
android:inputType="phone"
android:maxLength="11"
android:maxLines="1"
android:nextFocusDown="#id/sam1"
android:textColor="#673AB7"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/sam3"
app:layout_constraintVertical_bias="0.3" />
<TextView
android:id="#+id/sam3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:text="sample"
android:textColor="#673AB7"
android:textSize="23sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
</android.support.v7.widget.CardView>
<Button
android:id="#+id/sam1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:textColor="#fff"
android:background="#673AB7"
android:text="sample"
android:layout_marginLeft="60dp"
android:layout_marginRight="60dp"
android:textSize="18sp"
app:layout_constraintBottom_toBottomOf="#+id/card1"
app:layout_constraintEnd_toEndOf="#+id/card1"
app:layout_constraintStart_toStartOf="#+id/card1"
app:layout_constraintTop_toBottomOf="#+id/card1" />
</android.support.constraint.ConstraintLayout>
the second XML file main_contents2 drew from top and android just put the EditText from top of the keyboard.BUT the main_contents drawn from the bottom of the screen. so when the soft keyboard comes up the layout resizes.

Try changing the layout_height of scrollview to wrap_content.

All you need to do is
android:isScrollContainer="true"

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