将波纹效果添加到RecyclerView项目

问题描述

我正在尝试将波纹效果添加到RecyclerView的项目中.我在网上看了一下，但找不到我需要的东西.我认为它必须是自定义效果.我已经尝试将android:background属性设置为RecyclerView本身，并将其设置为?android:selectableItemBackground"，但是它不起作用.

I am trying to add Ripple Effect to RecyclerView's item. I had a look online, but could not find what I need. I assume it has to be a custom effect. I have tried android:background attribute to the RecyclerView itself and set it to "?android:selectableItemBackground" but it did not work.:

    <android.support.v7.widget.RecyclerView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:focusable="true"
    android:clickable="true"
    android:background="?android:selectableItemBackground"
    android:id="@+id/recyclerView"
    android:layout_below="@+id/tool_bar"/>

这是我要在其中添加效果的RecyclerView:

This is the RecyclerView that I am trying to add the effect to:

推荐答案

我知道了.我唯一要做的就是添加此属性:

I figured out. The only thing that I had to do is to add this attribute:

android:background="?android:attr/selectableItemBackground"

像这样使RecyclerView适配器膨胀的布局的根元素:

to the root element of the layout that my RecyclerView adapter inflates like that:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:paddingTop="8dp"
    android:paddingBottom="8dp"
    android:background="?android:attr/selectableItemBackground"
    tools:background="@drawable/bg_gradient">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="17sp"
        android:layout_marginLeft="15dp"
        android:layout_marginStart="15dp"
        android:id="@+id/shoppingListItem"
        android:hint="@string/enter_item_hint"
        android:layout_centerVertical="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"/>

    <CheckBox
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/shopping_list_item_checkbox_label"
        android:id="@+id/shoppingListCheckBox"
        android:layout_centerVertical="true"
        android:layout_marginRight="15dp"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"
        android:checked="false"/>

</RelativeLayout>

结果:

如果仍然看不到波纹效果，请将这些线条也添加到布局的根元素中.

If you are still not able to see ripple effect, add these lines also to the root element of the layout.

android:clickable="true"
android:focusable="true"

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