问题描述
将嵌套滚动视图放入带圆角的材料卡视图并滚动时，会出现一个错误，即其他材料卡视图不会被剪裁，并且边缘会溢出圆角。文本视图和 viewpager 对象的角落被剪得很好。此错误出现在 api 28 及更低版本上。
<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/fragment_workout_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="framework.presentation.workouts.WorkoutFragment"
>
<com.google.android.material.appbar.AppBarLayout
android:id="@+id/app_bar_workout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:contentInsetStart="0dp"
app:elevation="0dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<include
android:id="@+id/toolbar_workout_navigation"
layout="@layout/toolbar_home" />
</com.google.android.material.appbar.AppBarLayout>
<com.google.android.material.card.MaterialCardView
style="@style/cv_style_all_rounded"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_marginBottom="@dimen/cv_margin_bottom"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/app_bar_workout"
app:strokeColor="@color/dividerColor"
app:strokeWidth="0.5dp">
<androidx.core.widget.nestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true"
android:overScrollMode="never"
>
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:id="@+id/home_header_image"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:adjustViewBounds="true"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="@drawable/home_header" />
<com.google.android.material.textview.MaterialTextView
android:id="@+id/home_title"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="32dp"
android:layout_marginTop="@dimen/header_margin_top"
android:layout_marginEnd="32dp"
android:gravity="center"
android:text="@string/home_title"
android:textSize="?attr/textAppearanceHeadline5"
android:textStyle="bold"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/home_header_image" />
<com.google.android.material.textview.MaterialTextView
android:id="@+id/home_description"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="32dp"
android:layout_marginTop="@dimen/description_margin_top"
android:layout_marginEnd="32dp"
android:gravity="center"
android:text="@string/home_description"
android:textSize="?attr/textAppearanceHeadline6"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/home_title" />
<View
android:id="@+id/divider_home"
android:layout_width="match_parent"
android:layout_height="1dp"
android:layout_marginStart="@dimen/workout_intro_left_right_margin"
android:layout_marginTop="@dimen/divider_margin_top"
android:layout_marginEnd="@dimen/workout_intro_left_right_margin"
android:background="?android:attr/dividerVertical"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/home_description" />
<androidx.viewpager2.widget.ViewPager2
android:id="@+id/quotesViewPager2"
android:layout_width="0dp"
android:layout_height="150dp"
android:layout_marginStart="@dimen/start_end_padding"
android:layout_marginTop="32dp"
android:layout_marginEnd="@dimen/start_end_padding"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/divider_home" />
<com.google.android.material.textview.MaterialTextView
android:id="@+id/tvFeaturedVideo"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginTop="32dp"
android:layout_marginEnd="16dp"
android:text="@string/featured_video"
android:textSize="?attr/textAppearanceHeadline6"
android:textStyle="bold"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/quotesViewPager2" />
<com.google.android.material.card.MaterialCardView
android:id="@+id/cvFeaturedVideo"
style="@style/cv_style_home_layout"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginStart="@dimen/start_end_padding"
android:layout_marginTop="8dp"
android:layout_marginEnd="@dimen/start_end_padding"
android:clipChildren="true"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/tvFeaturedVideo">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:id="@+id/featuredThumbNail"
android:layout_width="0dp"
android:layout_height="210dp"
android:layout_marginBottom="12dp"
android:adjustViewBounds="false"
android:scaleType="centerCrop"
app:layout_constraintBottom_toTopOf="@+id/featuredVideoTitle"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/featuredVideoTitle"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="32dp"
android:layout_marginEnd="32dp"
android:layout_marginBottom="12dp"
android:maxLines="1"
android:text="TextView"
android:textAlignment="center"
android:textSize="18sp"
android:textStyle="bold"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent" />
<ImageView
android:id="@+id/youtubeIcon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="@+id/featuredThumbNail"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="@drawable/youtube_logo_icon_150px" />
</androidx.constraintlayout.widget.ConstraintLayout>
</com.google.android.material.card.MaterialCardView>
重新创建的步骤：
约束布局 > 材料卡视图（主容器）> 嵌套滚动视图 > 附加材料卡视图（足以滚动）& API 28 及以下
解决方法
在 Cardview 中，在 xml 中添加属性：
cardPreventCornerOverlap="false"