我试图获得一个CardView显示涟漪效应时，通过设置android:背景属性在活动XML文件中描述这里在android开发人员页面，但它不起作用。没有动画，但是onClick中的方法被调用。我还尝试按照这里的建议创建一个ripple.xml文件，但结果相同。
出现在活动的XML文件中的CardView:
<android.support.v7.widget.CardView
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="155dp"
android:layout_height="230dp"
android:elevation="4dp"
android:translationZ="5dp"
android:clickable="true"
android:focusable="true"
android:focusableInTouchMode="true"
android:onClick="showNotices"
android:background="?android:attr/selectableItemBackground"
android:id="@+id/notices_card"
card_view:cardCornerRadius="2dp">
</android.support.v7.widget.CardView>
我对android开发相对陌生，所以我可能犯了一些明显的错误。
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。
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。
