如何在RecyclerView中使用fastScrollEnabled? [英] How to use fastScrollEnabled in RecyclerView?
问题描述
我是RecyclerView的新手,我想像Google联系人应用程序一样在RecyclerView中实现快速滚动功能并在互联网上搜索,我发现现在Android正式为RecyclerView提供了新的fastScrollEnabled
布尔标志.所以我的问题是有人可以提供它的示例实现.
I am new to RecyclerView and I want to implement the fast scroll feature in RecyclerView like google contact application and search on the internet and i found that now Android provide officially New fastScrollEnabled
boolean flag for RecyclerView. So my question is can someone provide the sample implementation of it.
这是Google的官方文件 https://developer.android.com/topic/libraries/support-library/revisions.html#26-0-0
Here is the official document from google https://developer.android.com/topic/libraries/support-library/revisions.html#26-0-0
推荐答案
有了支持库26,我们可以轻松地为RecyclerView启用快速滚动.让我们开始吧!
With Support Library 26, we can easily enable fast scrolling for RecyclerView. Let’s get to it!
让我们逐一介绍每个属性:
Let’s go over each property one by one :
- fastScrollEnabled :布尔值,用于启用快速滚动.将此设置为true要求我们提供以下四个 属性.
- fastScrollHorizontalThumbDrawable :一个StateListDrawable,将用于绘制拇指,该拇指可在 水平轴.
- fastScrollHorizontalTrackDrawable :一个StateListDrawable,将用于绘制表示滚动条的线 水平轴.
- fastScrollVerticalThumbDrawable :一个StateListDrawable,将用于绘制可在垂直轴上拖动的拇指.
- fastScrollVerticalTrackDrawable :一个StateListDrawable,将用于绘制表示滚动条的线 垂直轴.
- fastScrollEnabled : boolean value to enable the fast scrolling. Setting this as true will require that we provide the following four properties.
- fastScrollHorizontalThumbDrawable : A StateListDrawable that will be used to draw the thumb which will be draggable across the horizontal axis.
- fastScrollHorizontalTrackDrawable : A StateListDrawable that will be used to draw the line that will represent the scrollbar on horizontal axis.
- fastScrollVerticalThumbDrawable : A StateListDrawable that will be used to draw the thumb which will be draggable on vertical axis.
- fastScrollVerticalTrackDrawable : A StateListDrawable that will be used to draw the line that will represent the scrollbar on vertical axis.
添加build.gradle
add in build.gradle
dependencies {
....
compile 'com.android.support:design:26.0.1'
compile 'com.android.support:recyclerview-v7:26.0.1'
....
}
由于支持库26现在已移至Google的maven存储库,因此将其包含在我们的项目级别 build.gradle
Since Support Library 26 has now been moved to Google’s maven repository, let’s include that in our project level build.gradle
allprojects {
repositories {
jcenter()
maven {
url "https://maven.google.com"
}
}
}
activity_main.xml
activity_main.xml
<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:fastScrollEnabled="true"
app:fastScrollHorizontalThumbDrawable="@drawable/thumb_drawable"
app:fastScrollHorizontalTrackDrawable="@drawable/line_drawable"
app:fastScrollVerticalThumbDrawable="@drawable/thumb_drawable"
app:fastScrollVerticalTrackDrawable="@drawable/line_drawable">
</android.support.v7.widget.RecyclerView>
在可绘制文件夹中的四个xml文件下面添加
add below four xml file in your drawable folder,
line_drawable.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:state_pressed="true"
android:drawable="@drawable/line"/>
<item
android:drawable="@drawable/line"/>
</selector>
line.xml
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<solid android:color="@android:color/darker_gray" />
<padding
android:top="10dp"
android:left="10dp"
android:right="10dp"
android:bottom="10dp"/>
</shape>
thumb_drawable.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:state_pressed="true"
android:drawable="@drawable/thumb"/>
<item
android:drawable="@drawable/thumb"/>
</selector>
thumb.xml
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<corners
android:topLeftRadius="44dp"
android:topRightRadius="44dp"
android:bottomLeftRadius="44dp" />
<padding
android:paddingLeft="22dp"
android:paddingRight="22dp" />
<solid android:color="@color/colorPrimaryDark" />
</shape>
这篇关于如何在RecyclerView中使用fastScrollEnabled?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!