how can we use v7widget code in android studio?. how to use v7widget in androidx?

**this is my new project want to insert in this old code **<?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">

 </androidx.constraintlayout.widget.ConstraintLayout> 

**showing error on v7 widget while inserting old codes ** <?xml

version="1.0" encoding="utf-8"?>

 <android.support.v7.widget.CardView android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_margin="5dp"> <RelativeLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:padding="8dp"> <ImageView android:id="@+id/imageView" android:layout_width="120dp" android:layout_height="90dp" android:padding="4dp" /> <TextView android:id="@+id/textViewTitle" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="5dp" android:layout_toRightOf="@id/imageView" android:text="Apple MacBook Air Core i5 5th Gen - (8 GB/128 GB SSD/Mac OS Sierra)" android:textAppearance="@style/Base.TextAppearance.AppCompat.Small" android:textColor="#000000" /> <TextView android:id="@+id/textViewShortDesc" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/textViewTitle" android:layout_marginLeft="5dp" android:layout_marginTop="5dp" android:layout_toRightOf="@id/imageView" android:text="13.3 Inch, 256 GB" android:textAppearance="@style/Base.TextAppearance.AppCompat.Small" /> <TextView android:id="@+id/textViewRating" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/textViewShortDesc" android:layout_marginLeft="5dp" android:layout_marginTop="5dp" android:layout_toRightOf="@id/imageView" android:background="@color/colorPrimary" android:paddingLeft="15dp" android:paddingRight="15dp" android:text="4.7" android:textAppearance="@style/Base.TextAppearance.AppCompat.Small.Inverse" android:textStyle="bold" /> <TextView android:id="@+id/textViewPrice" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/textViewRating" android:layout_marginLeft="5dp" android:layout_marginTop="5dp" android:layout_toRightOf="@id/imageView" android:text="INR 56990" android:textAppearance="@style/Base.TextAppearance.AppCompat.Large" android:textStyle="bold" /> </RelativeLayout> </android.support.v7.widget.CardView> </LinearLayout>