错误的Android Studio预览行为 _Android

宁可枝头抱香死，何曾吹落北风中。这篇文章主要讲述错误的Android Studio预览行为相关的知识，希望能为你提供帮助。
我有两层布局，背景和内容（约束布局和图像）：

< ?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/colorPrimary" android:id="@+id/background_layout"> < androidx.constraintlayout.widget.ConstraintLayout android:id="@+id/content_layout" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_marginTop="150dp" android:gravity="center_horizontal" app:layout_constraintTop_toBottomOf="parent" app:layout_constraintTop_toTopOf="parent" android:elevation="20dp" android:background="@color/backgroundColor"> < com.google.android.material.card.MaterialCardView android:layout_width="100dp" android:layout_height="100dp" android:layout_alignParentTop="true" android:translationY="50dp" app:cardCornerRadius="50dp" app:layout_constraintBottom_toTopOf="@+id/relativeLayout2" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" android:elevation="21dp" app:cardElevation="21dp"> < ImageView android:id="@+id/circular_image" android:layout_width="fill_parent" android:layout_height="fill_parent" android:scaleType="fitCenter" android:src="https://www.songbingjia.com/android/@mipmap/ic_launcher" /> < /com.google.android.material.card.MaterialCardView> < /androidx.constraintlayout.widget.ConstraintLayout>

应该像image。当我在CardView中删除该行时