I want to show Native_Ads_view In XML file in android studio but it give me error? : hope you will be all fine basically my problem is that when i add native_ads_view in XML file it give me error ("Required XML_attribute "adSize" was missing").
i am stuck here i search alot but failed.I hope you guys give me better a response i am waiting for your answer.

XML FILE
```
    <?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"
    xmlns:ads="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#72B2D1"
    tools:context=".SplashScreen">

    <com.google.android.gms.ads.AdView
        android:id="@+id/adView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="10dp"
        app:adSize="BANNER"
        app:adUnitId="ca-app-pub-3940256099942544/6300978111"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

    </com.google.android.gms.ads.AdView>


    <com.google.android.gms.ads.NativeExpressAdView
        android:id="@+id/sndNativeAds"
        ads:adUnitId="ca-app-pub-3940256099942544/2247696110"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        ads:adSize="300x200"
        app:layout_constraintBottom_toTopOf="@+id/btn_move"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/adView">
    </com.google.android.gms.ads.NativeExpressAdView>

    <Button
        android:id="@+id/btn_move"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="20dp"
        android:text="Move To Next"
        android:textSize="20sp"
        android:background="#000000"
        android:textColor="#fff"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent" />


</androidx.constraintlayout.widget.ConstraintLayout>
Error
```
    Required XML_attribute "adSize" was missing