RecyclerView上的涟漪效应在轻按时不起作用 [英] RIpple effect on RecyclerView not working on light tap

问题描述

我试图在RecyclerView上实现涟漪效应.这是我的布局:

I have tried to implement the ripple effect on my RecyclerView. Here's my layout for it :

<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/card"
        android:layout_marginTop="7dp"
        android:layout_marginLeft="16dp"
        android:layout_marginRight="16dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        card_view:cardCornerRadius="5dp"
        android:clickable="true"
        card_view:cardElevation="5dp"
        android:focusable="true"
        android:foreground="?android:attr/selectableItemBackground">

            <LinearLayout
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:orientation="vertical"
                android:padding="16dp">

                <TextView
                    //some properties />

                <TextView
                    //some properties />

                <TextView
                    //some properties />
            </LinearLayout>

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

为了实现onclick侦听器，我基本上在这里遵循了本教程: http://sapandiwakar.in/recycler-view-item-click-handler/

In order to implement the onclick listener I basically followed this tutorial here: http://sapandiwakar.in/recycler-view-item-click-handler/

问题在于波纹效应是由于线条而产生的:

The problem is that the ripple effect,generated thanks to the lines :

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

不能在轻(即快速)压力机上工作.当我快速点击屏幕时，将触发点击侦听器.这意味着已检测到触摸事件，但是没有显示波纹效应.如果要查看涟漪效应，必须在释放之前将屏幕上的压力保持更长的时间.

is not working on light (it's to say quick) presses. When I just quickly tap the screen, the click listener is triggered. It means that the touch event have been detected, however there is no ripple effect showing. If I want to see the ripple effect, I have to maintain for a bit longer the pressure on the screen before releasing.

是否有一种方法可以纠正这种现象，甚至在快速按下时也能显示出波纹效果?

Is there a way to correct this behaviour and show a ripple effect even for quick presses?

推荐答案

我遇到了类似的问题.我在RecyclerView上有一个ItemClickListener，在那个侦听器中，我正在推送一个新片段.通过反复试验，我注意到删除或清空项目Click侦听器将使高亮显示每次显示，即使轻按也是如此.

I faced a similar problem. I had an ItemClickListener on the RecyclerView, and in that listener I was pushing a new fragment. By trial and error I noticed that removing or emptying the item click listener would get the highlight to show every time, even on light taps.

解决方法是更改​​我的onItemClick方法:

The fix was to change my onItemClick method:

@Override
public void onItemClick(final RecyclerView parent, final View view, final int position, final long id)
{
    ViewCompat.postOnAnimationDelayed(parent, new Runnable()
    {
        @Override
        public void run()
        {
            // Your click code goes here
        }
    }, 50);
}

这会将您的点击动作推迟到下一个动画步骤之后的50毫秒，并为动画提供足够的时间来加载和运行，然后再执行点击动作.

This postpones your click action until 50ms after the next animation step and gives the animation enough time to load and run before your click action is performed.

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