Develop Reference

linearlayout is not getting displayed below recyclerview

in my layout i have recyclerview of product listing..below that im displaying total price in linearlayout ...but on scroll linearlayout is not displaying
sceneorio of my code:
1--> when i have one item on recyclerview -->linearlayout displays fine
2--> when i have more items on recyclerview -->on scrolling down linearlayout cant be seen(linear layout is not displaying)
need help in second sceneorio...thanks in advance
Following here is code xml:--
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/relative">
<androidx.appcompat.widget.Toolbar
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:collapseIcon="#drawable/ic_arrow_back_black_24dp"
android:id="#+id/toolbartable"
android:background="#color/colorPrimaryDark">
</androidx.appcompat.widget.Toolbar>
</RelativeLayout>
<ScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#id/relative"
android:id="#+id/nest"
android:scrollbars="vertical">
<androidx.recyclerview.widget.RecyclerView
android:layout_width="match_parent"
android:layout_below="#id/relative"
android:layout_height="wrap_content"
android:id="#+id/recyleview"/>
</ScrollView>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="100dp"
android:id="#+id/linearlayoutorder"
android:layout_below="#id/nest"
android:orientation="horizontal"
android:weightSum="2"
android:background="#drawable/border"
android:backgroundTintMode="#color/colorPrimary">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TOTAL"
android:layout_gravity="center"
android:layout_weight="1"></TextView>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:id="#+id/totalidcost"
android:layout_gravity="right|center"
android:textAlignment="textEnd"
tools:ignore="RtlCompat"></TextView>
</LinearLayout>
</RelativeLayout>
Updated code:--
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/relative">
<androidx.appcompat.widget.Toolbar
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:collapseIcon="#drawable/ic_arrow_back_black_24dp"
android:id="#+id/toolbartable"
android:background="#color/colorPrimaryDark">
</androidx.appcompat.widget.Toolbar>
</RelativeLayout>
<androidx.core.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/nest"
android:scrollbars="vertical"
android:layout_below="#id/relative">
<androidx.recyclerview.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:nestedScrollingEnabled="false"
android:id="#+id/recyleview"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="100dp"
android:id="#+id/linearlayoutorder"
android:orientation="horizontal"
android:weightSum="2"
android:background="#drawable/border"
android:backgroundTintMode="#color/colorPrimary">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TOTAL"
android:layout_gravity="center"
android:layout_weight="1"></TextView>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:id="#+id/totalidcost"
android:layout_gravity="right|center"
android:textAlignment="textEnd"
tools:ignore="RtlCompat"></TextView>
</LinearLayout>
</androidx.core.widget.NestedScrollView>
</RelativeLayout>
error getting--:Caused by: android.view.InflateException: Binary XML file line #34: ScrollView can host only one direct child
`Caused by: java.lang.IllegalStateException: ScrollView can host only one direct child`
need help

following solution worked for me:-
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/relative">
<androidx.appcompat.widget.Toolbar
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:collapseIcon="#drawable/ic_arrow_back_black_24dp"
android:id="#+id/toolbartable"
android:background="#color/colorPrimaryDark">
</androidx.appcompat.widget.Toolbar>
</RelativeLayout>
<androidx.core.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/nest"
android:scrollbars="vertical"
android:layout_below="#id/relative">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<androidx.recyclerview.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:nestedScrollingEnabled="false"
android:id="#+id/recyleview"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="100dp"
android:id="#+id/linearlayoutorder"
android:layout_below="#id/recyleview"
android:orientation="horizontal"
android:weightSum="2"
android:background="#drawable/border"
android:backgroundTintMode="#color/colorPrimary">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TOTAL"
android:layout_gravity="center"
android:layout_weight="1"></TextView>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:id="#+id/totalidcost"
android:layout_gravity="right|center"
android:textAlignment="textEnd"
tools:ignore="RtlCompat"></TextView>
</LinearLayout>
</RelativeLayout>
</androidx.core.widget.NestedScrollView>
</RelativeLayout>

You haven't added weightSum and orientation values ​​for LinearLayout.
Source

You can use a NestedScrollView instead of the ScrollView. And also put your RecyclerView as well as the LinearLayout inside the NestedScrollView. And enable android:nestedScrollingEnabled=true. Should work for you.
<NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:nestedScrollingEnabled=true>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recyleview"
android:layout_width="match_parent"
android:layout_height="0dp"
app:layout_constraintBottom_toTopOf="#id/linearlayoutorder"
app:layout_constraintTop_toBottomOf="#id/relative" />
<LinearLayout
android:id="#+id/linearlayoutorder"
android:layout_width="match_parent"
android:layout_height="100dp"
android:background="#000000"
android:backgroundTintMode="#color/colorPrimary"
android:orientation="horizontal"
android:weightSum="2"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="1"
android:text="TOTAL" />
<TextView
android:id="#+id/totalidcost"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right|center"
android:layout_weight="1"
android:textAlignment="textEnd"
tools:ignore="RtlCompat" />
</LinearLayout>
</LinearLayout>
And in your java class where you have your recyclerview set recyclerView.setNestedScrollingEnabled(true or false);

Use ConstraintLayout like this way, Here is full xml code what you need
<?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">
<RelativeLayout
android:id="#+id/relative"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent">
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbartable"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/colorPrimaryDark"
app:collapseIcon="#drawable/back" />
</RelativeLayout>
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recyleview"
android:layout_width="match_parent"
android:layout_height="0dp"
app:layout_constraintBottom_toTopOf="#id/linearlayoutorder"
app:layout_constraintTop_toBottomOf="#id/relative" />
<LinearLayout
android:id="#+id/linearlayoutorder"
android:layout_width="match_parent"
android:layout_height="100dp"
android:background="#000000"
android:backgroundTintMode="#color/colorPrimary"
android:orientation="horizontal"
android:weightSum="2"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="1"
android:text="TOTAL" />
<TextView
android:id="#+id/totalidcost"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right|center"
android:layout_weight="1"
android:textAlignment="textEnd"
tools:ignore="RtlCompat" />
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>

Align button for right in the middle of TextView

I want to align button for right in the middle of TextView like WhatsApp. Android studio's layout preview screen is showing right but at phone it is not align middle of TextView, align bottom of screen.
No problem with fragment alone but when fragment inside activity, problem occurs. I understand that my activity layout is wrong.
How can I align send button?
Whatsapp button:
My button at Android Studio preview:
My button at phone:
my fragment layout:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/colorBlue"
android:orientation="vertical">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<TextView
android:id="#+id/userNames"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:background="#color/colorPrimary"
android:ellipsize="end"
android:gravity="start|center_vertical"
android:maxLines="1"
android:padding="10dp"
android:scrollbars="horizontal"
android:scrollHorizontally="true"
android:text="Hello Nilu Pilu"
android:textColor="#color/colorGreen" />
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentBottom="true"
android:layout_gravity="center"
android:layout_marginBottom="10dp"
android:contentDescription="#null"
android:src="#drawable/ic_log_out" />
</RelativeLayout>
my activity layout:
<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout 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="fill_parent"
android:layout_height="fill_parent"
android:focusable="true"
android:focusableInTouchMode="true"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="40dp"
android:background="#color/colorPrimary"
android:popupTheme="#style/ThemeOverlay.AppCompat.Light"
android:theme="#style/ThemeOverlay.AppCompat.Dark"
app:tabMode="scrollable">
<androidx.appcompat.widget.SearchView
android:id="#+id/search_action"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:contentDescription="#null"
android:iconifiedByDefault="false"
android:tint="#color/white"
app:defaultQueryHint="#string/searchForName"
app:iconifiedByDefault="false"
app:queryHint="#string/searchForName"
app:srcCompat="#drawable/ic_search_24" />
</androidx.appcompat.widget.Toolbar>
<LinearLayout
android:id="#+id/share_list_fragment"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
tools:ignore="MergeRootFrame" />
</LinearLayout>
</androidx.coordinatorlayout.widget.CoordinatorLayout>

NO need to use nested RelativeLayout you can achieve it only using single RelativeLayout
Try this using RelativeLayout
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/colorBlue"
android:orientation="vertical">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<TextView
android:id="#+id/userNames"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:background="#color/colorPrimary"
android:ellipsize="end"
android:gravity="start|center_vertical"
android:maxLines="1"
android:padding="10dp"
android:scrollbars="horizontal"
android:scrollHorizontally="true"
android:text="Hello Nilu Pilu"
android:textColor="#color/colorGreen" />
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentBottom="true"
android:layout_gravity="center"
android:layout_marginBottom="10dp"
android:contentDescription="#null"
android:src="#drawable/ic_log_out" />
</RelativeLayout>
Try this using ConstraintLayout
<?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/colorBlue"
android:orientation="vertical">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/userNames"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:background="#color/colorPrimary"
android:ellipsize="end"
android:gravity="start|center_vertical"
android:maxLines="1"
android:padding="10dp"
android:scrollbars="horizontal"
android:scrollHorizontally="true"
android:text="Hello Nilu Pilu"
android:textColor="#color/colorGreen"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginBottom="10dp"
android:contentDescription="#null"
android:src="#drawable/ic_log_out"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
OUTPUT

I suggest use ConstraintLayout layout instead of RelativeLayout and here is your code with ConstraintLayout, which will work perfectly.
<?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"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:background="#color/emptyListColor"
android:orientation="vertical">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recyclerView"
android:layout_width="match_parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toTopOf="#+id/bottomView"
android:layout_height="0dp" />
<RelativeLayout
android:id="#+id/bottomView"
android:layout_width="match_parent"
android:layout_height="40dp"
app:layout_constraintBottom_toBottomOf="parent"
android:layout_alignParentBottom="true"
android:background="#color/colorPrimary"
android:padding="5dp">
<TextView
android:id="#+id/userNames"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start|center_vertical"
android:ellipsize="end"
android:gravity="start|center_vertical"
android:maxLines="1"
android:padding="5dp"
android:scrollbars="horizontal"
android:scrollHorizontally="true"
android:textColor="#color/white" />
</RelativeLayout>
<ImageView
android:id="#+id/button"
android:layout_width="50dp"
android:layout_height="50dp"
app:layout_constraintTop_toTopOf="#+id/bottomView"
app:layout_constraintBottom_toTopOf="#+id/bottomView"
app:layout_constraintEnd_toEndOf="#+id/bottomView"
android:layout_gravity="center"
android:layout_margin="10dp"
android:background="#drawable/send_circle"
android:contentDescription="#null"
android:src="#drawable/attach_send2" />
</androidx.constraintlayout.widget.ConstraintLayout>

Bottomsheet Error : The view is not a child of CoordinatorLayout

I want to create a layout in which 80% of the Screen Contains separate layout and 20% contains the bottom sheet vertically. But when i try to do it, it gives me error "The view is not a child of CoordinatorLayout". I got the error, but i can't figure out some other way to do it. Can Someone please help me to achieve it. Help will be Appreciated.
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
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="#efefef">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:weightSum="5">
<include
layout="#layout/content_main_new"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="4" />
<include
layout="#layout/content_bottom_sheet2"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" />
</LinearLayout>
</android.support.design.widget.CoordinatorLayout>
content_bottom_sheet2.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
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">
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/bottomSheetLayout"
android:layout_width="match_parent"
android:layout_height="230dp"
android:background="#color/colorPrimary"
android:orientation="vertical"
android:padding="#dimen/activity_vertical_margin"
app:behavior_peekHeight="90dp"
app:layout_behavior="#string/bottom_sheet_behavior">
<!--android:background="#android:color/holo_orange_light"-->
<android.support.v7.widget.CardView
android:id="#+id/cvBottomCard"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:elevation="#dimen/spIconsize"
android:visibility="visible"
app:cardBackgroundColor="#color/white"
app:cardCornerRadius="10dp"
app:cardElevation="5dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:id="#+id/linearLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:paddingTop="10dp"
android:orientation="horizontal">
<Button
android:layout_marginBottom="5dp"
android:id="#+id/btnReview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginRight="15dp"
android:layout_weight="1"
android:background="#drawable/rounded_button_darkgreen_bg"
android:text="Review"
android:textColor="#color/white" />
<Button
android:layout_marginBottom="5dp"
android:id="#+id/btnReschedule"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="15dp"
android:layout_weight="1"
android:background="#drawable/rounded_button_grey"
android:text="Reschedule"
android:textColor="#color/white" />
</LinearLayout>
<RelativeLayout
android:id="#+id/relLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#+id/linearLayout"
android:layout_marginTop="5dp"
android:padding="10dp"
android:visibility="visible">
<ImageButton
android:id="#+id/imageButton"
android:layout_width="80dp"
android:layout_height="90dp"
android:src="#drawable/user"
android:visibility="gone" />
<TextView
android:id="#+id/tvappointmentId"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toEndOf="#+id/imageButton"
android:text="Appointment ID - 5727"
android:textColor="#color/black" />
<TextView
android:id="#+id/tvCustomerName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/tvappointmentId"
android:layout_toEndOf="#+id/imageButton"
android:text="Name - Virat Sharma"
android:textColor="#color/black" />
<TextView
android:id="#+id/tvLoanType"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/tvCustomerName"
android:layout_toEndOf="#+id/imageButton"
android:text="Loan Type - Home LOAN" />
<TextView
android:id="#+id/tvLoanAmount"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/tvLoanType"
android:layout_toEndOf="#+id/imageButton"
android:text="Loan Amount - 5727" />
<TextView
android:id="#+id/tvTime"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/tvappointmentId"
android:layout_alignBottom="#+id/tvappointmentId"
android:layout_alignParentEnd="true"
android:gravity="right"
android:text="01:22 Mins"
android:textColor="#color/red_error"
android:textStyle="bold"
android:visibility="gone" />
</RelativeLayout>
</RelativeLayout>
</android.support.v7.widget.CardView>
</LinearLayout>
</android.support.design.widget.CoordinatorLayout>

Can you try this way, please?
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/bottomSheetLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:behavior_peekHeight="90dp"
app:layout_behavior="#string/bottom_sheet_behavior">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="230dp"
android:background="#color/colorPrimary"
android:orientation="vertical"
android:padding="#dimen/activity_vertical_margin">
...
</LinearLayout>
</android.support.design.widget.CoordinatorLayout>
All that I have done is to put the id that you will call later as your bottom sheet in the root element (Which by the way could be a ConstraintLayout if you want), as you can notice, the parent of this root element will be automatically a CoodinatorLayout.
The second thing is to put this element with a height wrap_content
The layout behaviour should be in the root element, too. app:layout_behavior="#string/bottom_sheet_behavior"

Button not displaying in layout

This is my XML:
<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:id="#+id/main_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
tools:context=".MainActivity">
<LinearLayout
android:id="#+id/logoLayout"
android:layout_width="150dp"
android:layout_height="40dp"
android:layout_marginLeft="120dp"
android:layout_marginTop="25dp"
android:orientation="vertical">
<ImageView
android:id="#+id/imageView3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:srcCompat="#drawable/csr_logo2" />
</LinearLayout>
<LinearLayout
android:id="#+id/lineLayout"
android:layout_width="match_parent"
android:layout_height="2dp"
android:layout_below="#+id/logoLayout"
android:layout_marginBottom="15dp"
android:layout_marginTop="5dp"
android:orientation="vertical">
<ImageView
android:id="#+id/imageView4"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/dotted_line"
app:srcCompat="#drawable/dotted_line" />
<ImageView
android:id="#+id/imageView5"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:srcCompat="#drawable/normal_line" />
</LinearLayout>
<android.support.design.widget.TabLayout
android:id="#+id/tabLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/white"
android:minHeight="?attr/actionBarSize"
android:textColor="#color/black"
android:theme="#style/AppTheme"
app:tabMode="scrollable" />
<com.example.sparsh.newcsraudit.CustomViewPager
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</com.example.sparsh.newcsraudit.CustomViewPager>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:id="#+id/completeBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:text="Complete Audit" />
</LinearLayout>
</LinearLayout>
The 'Button' doesn't display in the layout.
My button needs to be displayed in every category of the layout.
Tried adding button to my activity that holds the categories, but it's not working.
Tried making adjustments, but didn't succeed.
Also, looked for similar questions online, but couldn't find the solution.
How do I make the button display in the layout.
Please help!

Try this change your root Layout to RelativeLayout and make your Button android:layout_alignParentBottom="true"
And make your
<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:id="#+id/main_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
tools:context=".MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<LinearLayout
android:id="#+id/logoLayout"
android:layout_width="150dp"
android:layout_height="40dp"
android:layout_marginLeft="120dp"
android:layout_marginTop="25dp"
android:orientation="vertical">
<ImageView
android:id="#+id/imageView3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:srcCompat="#drawable/kid_goku" />
</LinearLayout>
<LinearLayout
android:id="#+id/lineLayout"
android:layout_width="match_parent"
android:layout_height="2dp"
android:layout_below="#+id/logoLayout"
android:layout_marginBottom="15dp"
android:layout_marginTop="5dp"
android:orientation="vertical">
<ImageView
android:id="#+id/imageView4"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/ic_message"
app:srcCompat="#drawable/ic_message" />
<ImageView
android:id="#+id/imageView5"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:srcCompat="#drawable/kid_goku" />
</LinearLayout>
<android.support.design.widget.TabLayout
android:id="#+id/tabLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/white"
android:minHeight="?attr/actionBarSize"
android:textColor="#color/colorPrimary"
android:theme="#style/AppTheme"
app:tabMode="scrollable" />
<com.example.sparsh.newcsraudit.CustomViewPager
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</com.example.sparsh.newcsraudit.CustomViewPager>
</LinearLayout>
<Button
android:id="#+id/completeBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:text="Complete Audit" />
</RelativeLayout>

How to best fit a customview of Floating Action Button together with Listview

I have a XML layout with edittext listview and a fab included in a linearlayout which it takes a large part on screen and if I remove weight or play with it I get a very small button or cropped.
<?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"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textPersonName"
android:ems="10"
android:id="#+id/inputSearch"
android:hint="Αναζητηση" />
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:layout_margin="4dp">
<ListView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/listCustomers"
android:layout_margin="5dp"
android:dividerHeight="2dp" />
</LinearLayout>
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="2"
android:layout_gravity="bottom|center"
android:gravity="right"
android:layout_margin="4dp">
<android.support.design.widget.FloatingActionButton
android:layout_width="56dp"
android:layout_height="56dp"
android:id="#+id/fab"
app:backgroundTint="#android:color/holo_orange_light"
android:layout_gravity="bottom|center"
android:layout_margin="10dp"
android:src="#drawable/ic_action_cross" />
</LinearLayout>
How I can have a best fit of these three elements here?

Replace your complete layout with below:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<EditText
android:id="#+id/inputSearch"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:hint="Αναζητηση"
android:inputType="textPersonName" />
<ListView
android:id="#+id/listCustomers"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/inputSearch"
android:layout_margin="9dp"
android:dividerHeight="2dp" />
<android.support.design.widget.FloatingActionButton
android:id="#+id/fab"
android:layout_width="56dp"
android:layout_height="56dp"
android:layout_alignParentRight="true"
android:layout_alignParentBottom="true"
android:layout_margin="14dp"
android:src="#drawable/ic_action_cross"
app:backgroundTint="#android:color/holo_orange_light" />
</RelativeLayout>