How to include constraint layout to another constraint layout and set constraint between each

Actually found a solution.Android Studio does not autocomplete constraintLayout parameters in an include tag but they do have an impact on it as long as you give that include a size.

<include        layout="@layout/tmp_2"        android:layout_width="0dp"        android:layout_height="wrap_content"        android:layout_marginTop="10dp"        app:layout_constraintStart_toStartOf="parent"        app:layout_constraintEnd_toEndOf="parent"        app:layout_constraintTop_toBottomOf="@+id/label_2"        />

To inlude one constraint layout and constraint it according to one's need, one will have to give width and height to the included layout like this :

<include        android:id="@+id/shop_card_layout"        layout="@layout/shop_card_one"        android:layout_height="wrap_content"        android:layout_width="300dp"        android:layout_marginTop="8dp"        app:layout_constraintStart_toStartOf="@id/heading_tv"        app:layout_constraintTop_toBottomOf="@+id/heading_tv" />

You could avoid the ConstraintLayout constraints at the include item. I just <include/> it as it is.

MainActivity Layout file:

<?xml version="1.0" encoding="utf-8"?><android.support.constraint.ConstraintLayout    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent">    <include        android:id="@+id/toolbarLayout"        layout="@layout/layout_toolbar" />    <TextView        android:id="@+id/textView2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_marginBottom="8dp"        android:layout_marginEnd="8dp"        android:layout_marginStart="8dp"        android:layout_marginTop="8dp"        android:text="CONTENTS"        app:layout_constraintBottom_toBottomOf="@+id/footerLayout"        app:layout_constraintEnd_toEndOf="@+id/footerLayout"        app:layout_constraintStart_toStartOf="@+id/footerLayout"        app:layout_constraintTop_toTopOf="@+id/footerLayout" />    <include        android:id="@+id/footerLayout"        layout="@layout/layout_footer" /></android.support.constraint.ConstraintLayout>

ToolBar Layout file:

<android.support.constraint.ConstraintLayout    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent">    <android.support.v7.widget.Toolbar        android:id="@+id/toolbar"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:background="@color/colorPrimary"        android:minHeight="?attr/actionBarSize"        app:layout_constraintRight_toRightOf="parent"        app:layout_constraintStart_toStartOf="parent"        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"        app:popupTheme="@style/ThemeOverlay.AppCompat.Light">        <TextView            android:id="@+id/toolbarTitleTextView"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_gravity="center"            android:text="@string/hidden"            android:textColor="@android:color/white"            tools:layout_editor_absoluteX="192dp"            tools:layout_editor_absoluteY="19dp" />    </android.support.v7.widget.Toolbar></android.support.constraint.ConstraintLayout>