인프런 커뮤니티 질문&답변

<?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:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#008000"
    android:orientation="vertical"
    tools:context=".MainActivity">


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="200dp"
        android:layout_marginTop="100dp"
        tools:ignore="MissingConstraints">
        
        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textSize="30sp"
            android:gravity="center"
            android:textColor="@color/black"
            android:layout_margin="20dp"
            android:textStyle="bold"
            android:text="인생은 주사위 한방에 가는거 아니겠습니까?"/>

    </LinearLayout>


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="200dp"
        tools:ignore="MissingConstraints">

        <ImageView
            android:src="@drawable/dice_1"
            android:layout_width="120dp"
            android:layout_height="120dp"/>
        <ImageView
            android:src="@drawable/dice_2"
            android:layout_width="120dp"
            android:layout_height="120dp"/>


    </LinearLayout>


</androidx.constraintlayout.widget.ConstraintLayout>

제대로 따라서 타이핑 한것 같은데 왜 그럴까요?