CardView中的ImageView在Android 4.3上不显示半径 [英] ImageView in CardView not show radius on Android 4.3

问题描述

这是我的布局xml:

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    android:id="@+id/catalog_item_card_view"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    card_view:cardCornerRadius="5dp"
    card_view:cardUseCompatPadding="true">

    <android.support.constraint.ConstraintLayout
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <ImageView
            android:id="@+id/imageViewPhoto"
            android:layout_width="wrap_content"
            android:layout_height="160dp"
            android:src="@drawable/test_merchant_preview"
            card_view:layout_constraintLeft_toLeftOf="parent"
            card_view:layout_constraintRight_toRightOf="parent"
            card_view:layout_constraintTop_toTopOf="parent" />

    </android.support.constraint.ConstraintLayout>


</android.support.v7.widget.CardView>

这是Andrdoid 5.0+上的结果

Here result on Andrdoid 5.0+

如您所见，ImageView成功显示为半径.好吧.

As you can see the ImageView success show with radius. OK.

现在，我在Android 4.3上运行应用程序.

Now I run app on Android 4.3.

结果如下:

如您所见，ImageView显示为无半径. 为什么?

As you can see the ImageView show without radius. Why?

推荐答案

CardView中的ImageView在Android 4.3上不显示半径

ImageView in CardView not show radius on Android 4.3

CardView高度仅适用于android 5.0及更高版本

CardView elevation only work on android 5.0 and above

CardView使用Lollipop上的height属性来生成阴影，并回退到旧平台上的自定义仿真阴影实现.

CardView uses elevation property on Lollipop for shadows and falls back to a custom emulated shadow implementation on older platforms.

由于圆角裁剪的昂贵特性，在Lollipop之前的平台上，CardView不会裁剪与圆角相交的子级.相反，它添加了填充来避免这种交集

Due to expensive nature of rounded corner clipping, on platforms before Lollipop, CardView does not clip its children that intersect with rounded corners. Instead, it adds padding to avoid such intersection

更多信息在此处阅读

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