如何将快速滚动条添加到RecyclerView

Question

如何将快速滚动条添加到RecyclerView

and*_*per 70 android scrollbar fastscroll sectionindexer android-recyclerview

背景

在ListView上,您可以使用快速滚动条,允许您拖动滚动条以轻松滚动到您希望的任何位置(使用fastScrollEnabled属性)

与" SectionIndexer "类和可选的一些属性一起,您可以在使用此滚动条时显示一个很好的弹出窗口(此处链接).

联系人应用程序上会显示这样的内容,以便您可以轻松滚动到特定字母.

问题

RecyclerView似乎没有任何这些.甚至不是快速滚动.

这个问题

如何为RecyclerView添加快速滚动功能？

Answer 1

Dan*_*ith 52

几天前,当我遇到这种情况时,我偶然发现了这个问题.以下是我对RecyclerView的FastScroll的示例实现:

github.com/danoz73/RecyclerViewFastScroller

尝试运行示例应用程序,并仔细阅读代码,以查看简单的RecyclerViewFastScroller小部件的简单用法.有关github的信息,但我会在这里列出垂直快速滚动的基本用法.

有关完整示例,请参阅repo中的示例应用程序.

基本用法

在RecyclerView所在的活动或片段XML中,包含VerticalRecyclerViewFastScroller对象.以下示例将采用相对布局:

...
  <android.support.v7.widget.RecyclerView
      android:id="@+id/recyclerView"
      android:layout_width="match_parent"
      android:layout_height="match_parent"/>


  <xyz.danoz.recyclerviewfastscroller.vertical.VerticalRecyclerViewFastScroller
      android:id="@+id/fast_scroller"
      android:layout_width="@dimen/however_wide_you_want_this"
      android:layout_height="match_parent"
      android:layout_alignParentRight="true"
    />
...

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在以编程方式设置布局的片段或活动中,将快速卷轴连接到回收器:

...
  public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
      View rootView = inflater.inflate(R.layout.recycler_view_frag, container, false);
      ...

      // Grab your RecyclerView and the RecyclerViewFastScroller from the layout
      RecyclerView recyclerView = (RecyclerView) rootView.findViewById(R.id.recyclerView);
      VerticalRecyclerViewFastScroller fastScroller = (VerticalRecyclerViewFastScroller) rootView.findViewById(R.id.fast_scroller);

      // Connect the recycler to the scroller (to let the scroller scroll the list)
      fastScroller.setRecyclerView(recyclerView);

      // Connect the scroller to the recycler (to let the recycler scroll the scroller's handle)
      recyclerView.setOnScrollListener(fastScroller.getOnScrollListener());

      ...
      return rootView;
  }
...

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希望这可以帮助!

编辑:现在增加了对Android-Lollipop-Contacts风格的部分指标的支持!有关详细信息,请查看示例应用程序的实现.

滚动时观察到这是不平滑的.它正在跳跃. (3认同)

Answer 2

and*_*per 27

由于所有第三方图书馆都存在问题,我决定收集我能找到的内容(主要来自此处),修复所有内容并发布我自己的RecyclerView快速滚动条的POC:

https://github.com/AndroidDeveloperLB/LollipopContactsRecyclerViewFastScroller

用法:

制作一个实现BubbleTextGetter的RecyclerView.Adapter,它在数据中给出一个位置,将返回要在bubble-popup中显示的文本.
将FastScroller放置在RecyclerView容器的布局中(可能位于正确的区域).
自定义FastScroller FastScroller

一些缺点:

不支持方向更改,但它可能很容易修复.
不支持其他layoutManagers.只有LinearLayoutManager
需要API 11及更高版本.

码:

BubbleTextGetter

public interface BubbleTextGetter
  {
  String getTextToShowInBubble(int pos);
  }

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recycler_view_fast_scroller__fast_scroller.xml

<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android"
       xmlns:tools="http://schemas.android.com/tools"
       android:layout_width="wrap_content"
       android:layout_height="match_parent">

  <TextView
    android:id="@+id/fastscroller_bubble"
    android:layout_gravity="right|end"
    android:gravity="center"
    android:textSize="48sp" tools:text="A"
    android:layout_width="wrap_content"
    android:textColor="#FFffffff"
    android:layout_height="wrap_content"
    android:background="@drawable/recycler_view_fast_scroller__bubble"
    android:visibility="visible"/>

  <ImageView
    android:id="@+id/fastscroller_handle"
    android:layout_width="wrap_content"
    android:layout_marginRight="8dp"
    android:layout_marginLeft="8dp"
    android:layout_height="wrap_content"
    android:src="@drawable/recycler_view_fast_scroller__handle"/>

</merge>

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主要活动

...
fastScroller=(FastScroller)findViewById(R.id.fastscroller);
fastScroller.setRecyclerView(recyclerView);

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FastScroller

public class FastScroller extends LinearLayout
  {
  private static final int BUBBLE_ANIMATION_DURATION=100;
  private static final int TRACK_SNAP_RANGE=5;

  private TextView bubble;
  private View handle;
  private RecyclerView recyclerView;
  private final ScrollListener scrollListener=new ScrollListener();
  private int height;

  private ObjectAnimator currentAnimator=null;

  public FastScroller(final Context context,final AttributeSet attrs,final int defStyleAttr)
    {
    super(context,attrs,defStyleAttr);
    initialise(context);
    }

  public FastScroller(final Context context)
    {
    super(context);
    initialise(context);
    }

  public FastScroller(final Context context,final AttributeSet attrs)
    {
    super(context,attrs);
    initialise(context);
    }

  private void initialise(Context context)
    {
    setOrientation(HORIZONTAL);
    setClipChildren(false);
    LayoutInflater inflater=LayoutInflater.from(context);
    inflater.inflate(R.layout.recycler_view_fast_scroller__fast_scroller,this,true);
    bubble=(TextView)findViewById(R.id.fastscroller_bubble);
    handle=findViewById(R.id.fastscroller_handle);
    bubble.setVisibility(INVISIBLE);
    }

  @Override
  protected void onSizeChanged(int w,int h,int oldw,int oldh)
    {
    super.onSizeChanged(w,h,oldw,oldh);
    height=h;
    }

  @Override
  public boolean onTouchEvent(@NonNull MotionEvent event)
    {
    final int action=event.getAction();
    switch(action)
      {
      case MotionEvent.ACTION_DOWN:
        if(event.getX()<handle.getX())
          return false;
        if(currentAnimator!=null)
          currentAnimator.cancel();
        if(bubble.getVisibility()==INVISIBLE)
          showBubble();
        handle.setSelected(true);
      case MotionEvent.ACTION_MOVE:
        setPosition(event.getY());
        setRecyclerViewPosition(event.getY());
        return true;
      case MotionEvent.ACTION_UP:
      case MotionEvent.ACTION_CANCEL:
        handle.setSelected(false);
        hideBubble();
        return true;
      }
    return super.onTouchEvent(event);
    }

  public void setRecyclerView(RecyclerView recyclerView)
    {
    this.recyclerView=recyclerView;
    recyclerView.setOnScrollListener(scrollListener);
    }

  private void setRecyclerViewPosition(float y)
    {
    if(recyclerView!=null)
      {
      int itemCount=recyclerView.getAdapter().getItemCount();
      float proportion;
      if(handle.getY()==0)
        proportion=0f;
      else if(handle.getY()+handle.getHeight()>=height-TRACK_SNAP_RANGE)
        proportion=1f;
      else
        proportion=y/(float)height;
      int targetPos=getValueInRange(0,itemCount-1,(int)(proportion*(float)itemCount));
      recyclerView.scrollToPosition(targetPos);
      String bubbleText=((BubbleTextGetter)recyclerView.getAdapter()).getTextToShowInBubble(targetPos);
      bubble.setText(bubbleText);
      }
    }

  private int getValueInRange(int min,int max,int value)
    {
    int minimum=Math.max(min,value);
    return Math.min(minimum,max);
    }

  private void setPosition(float y)
    {
    int bubbleHeight=bubble.getHeight();
    int handleHeight=handle.getHeight();
    handle.setY(getValueInRange(0,height-handleHeight,(int)(y-handleHeight/2)));
    bubble.setY(getValueInRange(0,height-bubbleHeight-handleHeight/2,(int)(y-bubbleHeight)));
    }

  private void showBubble()
    {
    AnimatorSet animatorSet=new AnimatorSet();
    bubble.setVisibility(VISIBLE);
    if(currentAnimator!=null)
      currentAnimator.cancel();
    currentAnimator=ObjectAnimator.ofFloat(bubble,"alpha",0f,1f).setDuration(BUBBLE_ANIMATION_DURATION);
    currentAnimator.start();
    }

  private void hideBubble()
    {
    if(currentAnimator!=null)
      currentAnimator.cancel();
    currentAnimator=ObjectAnimator.ofFloat(bubble,"alpha",1f,0f).setDuration(BUBBLE_ANIMATION_DURATION);
    currentAnimator.addListener(new AnimatorListenerAdapter()
    {
    @Override
    public void onAnimationEnd(Animator animation)
      {
      super.onAnimationEnd(animation);
      bubble.setVisibility(INVISIBLE);
      currentAnimator=null;
      }

    @Override
    public void onAnimationCancel(Animator animation)
      {
      super.onAnimationCancel(animation);
      bubble.setVisibility(INVISIBLE);
      currentAnimator=null;
      }
    });
    currentAnimator.start();
    }

  private class ScrollListener extends OnScrollListener
    {
    @Override
    public void onScrolled(RecyclerView rv,int dx,int dy)
      {
      View firstVisibleView=recyclerView.getChildAt(0);
      int firstVisiblePosition=recyclerView.getChildPosition(firstVisibleView);
      int visibleRange=recyclerView.getChildCount();
      int lastVisiblePosition=firstVisiblePosition+visibleRange;
      int itemCount=recyclerView.getAdapter().getItemCount();
      int position;
      if(firstVisiblePosition==0)
        position=0;
      else if(lastVisiblePosition==itemCount-1)
        position=itemCount-1;
      else
        position=firstVisiblePosition;
      float proportion=(float)position/(float)itemCount;
      setPosition(height*proportion);
      }
    }
  }

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我想你应该改变我写的代码. (3认同)

Answer 3

bon*_*nyz 11

有很多关于悬而未决的问题RecyclerView,并快速滚动/部分索引,让我们试着重整旗鼓,聚集在这里我们的意见和信息.

简短的回答是: NO,您无法启用快速滚动,因为RecyclerView不包含FastScroller对象,也不包含任何相关的逻辑状态变量.这是因为RecyclerView不是AbsListView.

另一方面,实现RecyclerView包含转储版本FastScroller和快速滚动所需逻辑的并非不可能,但到目前为止我还没有看到任何实现.

请分享您对此的考虑,或者如果您认为我错了.

Answer 4

Vee*_*ath 10

Android支持库26.0.0现在支持 fastScrollEnabled

RecyclerView的新fastScrollEnabled布尔标志.

如果启用,则必须设置fastScrollHorizontalThumbDrawable,fastScrollHorizontalTrackDrawable,fastScrollVerticalThumbDrawable和fastScrollVerticalTrackDrawable.

样本 - https://android.jlelse.eu/fast-scrolling-with-recyclerview-2b89d4574688

有趣!那么当你拖动它时,如何用文本显示气泡？ (2认同)

Answer 5

Abh*_*arg 5

FastScroller 功能是从 android 库 26.0.0 中为RecyclerView添加的

编译依赖

    compile 'com.android.support:recyclerview-v7:26.1.0'
    compile 'com.android.support:design:26.1.0'

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添加依赖项到project.gradle

     maven {
            url "https://maven.google.com"
        }

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你的 recyclerview.xml 文件

    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    xmlns:tool="http://schemas.android.com/tools"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    tool:context=".MainActivity">
    <android.support.v7.widget.RecyclerView
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                xmlns:app="http://schemas.android.com/apk/res-auto"
                android:id="@+id/songlist"
                android:layout_marginStart="8dp"
                android:layout_marginEnd="8dp"
                app:fastScrollEnabled="true"
              app:fastScrollVerticalThumbDrawable="@drawable/thumb_drawable"
                app:fastScrollVerticalTrackDrawable="@drawable/line_drawable"
                app:fastScrollHorizontalThumbDrawable="@drawable/thumb_drawable"
                app:fastScrollHorizontalTrackDrawable="@drawable/line_drawable"
               /></LinearLayout>

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拇指.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"
        android:bottomRightRadius="44dp" />

    <padding
        android:paddingLeft="22dp"
        android:paddingRight="22dp" />

    <solid android:color="#f73831" />

</shape>

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行.xml

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

    <solid android:color="@color/dark_grey" />

    <padding
        android:top="10dp"
        android:left="10dp"
        android:right="10dp"
        android:bottom="10dp"/>
</shape>

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拇指绘制.xml

    <?xml version="1.0" encoding="utf-8"?>
    <selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@drawable/thumb"
        android:state_focused="true"
        android:state_pressed="true" />

    <item android:drawable="@drawable/thumb"
        android:state_focused="false"
        android:state_pressed="true" />
    <item android:drawable="@drawable/thumb" 
            android:state_focused="true" />
    <item android:drawable="@drawable/thumb"
        android:state_focused="false"
        android:state_pressed="false" />
</selector>

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line_drawble.xml

    <?xml version="1.0" encoding="utf-8"?>
    <selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@drawable/line"
        android:state_focused="true"
        android:state_pressed="true" />

    <item android:drawable="@drawable/line"
        android:state_focused="false"
        android:state_pressed="true" />
    <item android:drawable="@drawable/line" 
            android:state_focused="true" />
    <item android:drawable="@drawable/line"
        android:state_focused="false"
        android:state_pressed="false" />
</selector>

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