android - CardView 在前 Lollipop 设备中显示黑色(不太好看)阴影

Question

卡片浏览 Lollipop 前设备在长按或单击通常会在具有 Lollipop 或更高版本的设备中显示波纹的位置时显示难看的黑色渐变。



这是我的 CardView XML

<android.support.v7.widget.CardView
    android:id="@+id/cardview1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    style="@style/swipe_section_padding"
    android:foreground="?android:attr/selectableItemBackground"
    android:clickable="true"
    card_view:cardCornerRadius="3dp"
    card_view:cardElevation="0dp"
    card_view:contentPadding="0dp">

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

Answer 1

尝试添加 card_view:cardUseCompatPadding="false"属性，

useCompatPadding boolean: true> if CardView should add padding for the shadows on platforms Lollipop and above.

查看cardview:cardUseCompatPadding

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="10dip" >

    <android.support.v7.widget.CardView
        android:id="@+id/cardview1"
        android:layout_width="match_parent"
        android:layout_height="100dp"
        android:clickable="true"
        android:foreground="?android:attr/selectableItemBackground"
        card_view:cardCornerRadius="3dp"
        card_view:cardElevation="2dp"
        card_view:cardUseCompatPadding="false"
        card_view:contentPadding="0dp" >
    </android.support.v7.widget.CardView >
</LinearLayout >