添加这两个类似的代码工作就像一个魅力的任何视图，如按钮，线性布局，或CardView只要把这两行，看看魔法…

android:foreground="?android:attr/selectableItemBackground"
android:clickable="true"

涟漪效应在您正在使用的appcompat支持库中被省略了。如果你想看到波纹，请使用Android L版本并在Android L设备上进行测试。根据AppCompat v7网站:

“为什么前棒棒糖时代没有涟漪?” 很多让RippleDrawable顺利运行的是Android 5.0的新RenderThread。为了优化之前Android版本的性能，我们暂时放弃了RippleDrawable。”

点击这个链接了解更多信息

For those searching for a solution to the issue of the ripple effect not working on a programmatically created CardView (or in my case custom view which extends CardView) being shown in a RecyclerView, the following worked for me. Basically declaring the XML attributes mentioned in the other answers declaratively in the XML layout file doesn't seem to work for a programmatically created CardView, or one created from a custom layout (even if root view is CardView or merge element is used), so they have to be set programmatically like so:

private class MadeUpCardViewHolder extends RecyclerView.ViewHolder {
    private MadeUpCardView cardView;

    public MadeUpCardViewHolder(View v){
        super(v);

        this.cardView = (MadeUpCardView)v;

        // Declaring in XML Layout doesn't seem to work in RecyclerViews
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            int[] attrs = new int[]{R.attr.selectableItemBackground};
            TypedArray typedArray = context.obtainStyledAttributes(attrs);
            int selectableItemBackground = typedArray.getResourceId(0, 0);
            typedArray.recycle();

            this.cardView.setForeground(context.getDrawable(selectableItemBackground));
            this.cardView.setClickable(true);
        }
    }
}

MadeupCardView将CardView Kudos扩展到TypedArray部分的答案。

如果有一个根布局，比如RelativeLayout或LinearLayout，它包含了CardView中所有适配器项的组件，你必须在那个根布局中设置background属性。如:

<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="122dp"
android:layout_marginBottom="6dp"
android:layout_marginLeft="6dp"
android:layout_marginRight="6dp"
card_view:cardCornerRadius="4dp">

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/touch_bg"/>
</android.support.v7.widget.CardView>

我设法通过以下方法在cardview上获得涟漪效应:

<android.support.v7.widget.CardView 
    xmlns:card_view="http://schemas.android.com/apk/res-auto" 
    android:clickable="true" 
    android:foreground="@drawable/custom_bg"/>

对于您在上面代码中看到的custom_bg，必须为lollipop(在可绘制的v21包中)和prelollipop(在可绘制的包中)设备定义一个XML文件。 对于drawable-v21包中的custom_bg，代码如下:

<ripple 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:color="?android:attr/colorControlHighlight">
<item
    android:id="@android:id/mask"
    android:drawable="@android:color/white"/>
</ripple>

对于可绘制包中的custom_bg，代码为:

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

<item android:state_pressed="true">
    <shape>
        <solid android:color="@color/colorHighlight"></solid>
    </shape>
</item>
<item>
    <shape>
        <solid android:color="@color/navigation_drawer_background"></solid>
    </shape>
</item>
</selector>

在前棒棒糖设备上，你会有一个固定的点击效果在棒棒糖设备上，你会在卡片视图上有一个涟漪效应。

android Cardview控件的Ripple事件:

<android.support.v7.widget.CardView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:foreground="?android:attr/selectableItemBackground"
    android:clickable="true"
    android:layout_marginBottom="4dp"
    android:layout_marginTop="4dp" />