如何在RecyclerView中的项目之间添加分隔符和空格?

android android-recyclerview

493641 观看

30回复

16154 作者的声誉

这是一个如何ListView使用dividerdividerHeight参数在类中执行的示例

<ListView
    android:id="@+id/activity_home_list_view"
    android:layout_width="match_parent" 
    android:layout_height="match_parent"
    android:divider="@android:color/transparent"
    android:dividerHeight="8dp"/>

但是,我没有在RecyclerView课堂上看到这种可能性。

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

在这种情况下,可以直接定义边距和/或将自定义分隔视图添加到列表项的布局中,还是有更好的方法来实现我的目标?

作者: EyesClear 的来源 发布者: 2014 年 7 月 7 日

回应 (30)


244

2499 作者的声誉

我可能会把你的注意力转移到Alex Fu的Github上的这个特定文件:https//gist.github.com/alexfu/0f464fc3742f134ccd1e

这是DividerItemDecoration.java示例文件“直接从支持演示中提取”。(https://plus.google.com/103498612790395592106/posts/VVEB3m7NkSS

在我的项目中导入此文件后,我能够很好地获得分隔线,并将其作为项目装饰添加到回收器视图中。

以下是我的onCreateView在包含Recyclerview的片段中的样子:

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

    mRecyclerView = (RecyclerView) rootView.findViewById(R.id.my_recycler_view);
    mRecyclerView.addItemDecoration(new DividerItemDecoration(getActivity(), DividerItemDecoration.VERTICAL_LIST));

    mRecyclerView.setHasFixedSize(true);
    mLayoutManager = new LinearLayoutManager(getActivity());
    mRecyclerView.setLayoutManager(mLayoutManager);
    mRecyclerView.setItemAnimator(new DefaultItemAnimator());

    return rootView;
}

我确信可以做更多的造型,但这是一个起点。:)

作者: Duy Nguyen 发布者: 21.07.2014 06:29

1037

16154 作者的声誉

2016年10月更新

Android支持库版本25.0.0引入了DividerItemDecoration类:

DividerItemDecoration是一个RecyclerView.ItemDecoration,可用作LinearLayoutManager项目之间的分隔符。它支持HORIZONTAL和VERTICAL方向。

用法:

DividerItemDecoration dividerItemDecoration = new DividerItemDecoration(recyclerView.getContext(),
    layoutManager.getOrientation());
recyclerView.addItemDecoration(dividerItemDecoration);

以前的答案

有些答案要么使用已被弃用的方法,要么不提供完整的解决方案,所以我尝试做一个简短的最新总结。


与此类不同ListViewRecyclerView该类没有与分隔符相关的参数。相反,你需要扩展ItemDecoration,一个RecyclerView内部类:

ItemDecoration允许应用程序从适配器的数据集向特定项视图添加特殊的绘图和布局偏移。这对于在项目,突出显示,可视分组边界等之间绘制分隔符非常有用。

所有ItemDecorations都按照它们添加的顺序绘制,在项目视图之前(在onDraw()中)和项目之后(在onDrawOver(Canvas,RecyclerView,RecyclerView.State)中)。

垂直间距 ItemDecoration

扩展ItemDecoration,添加自定义构造函数,将空间高度作为参数并覆盖getItemOffsets()方法:

public class VerticalSpaceItemDecoration extends RecyclerView.ItemDecoration {

    private final int verticalSpaceHeight;

    public VerticalSpaceItemDecoration(int verticalSpaceHeight) {
        this.verticalSpaceHeight = verticalSpaceHeight;
    }

    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent,
            RecyclerView.State state) {
        outRect.bottom = verticalSpaceHeight;
    }
}

如果您不想在最后一项下面插入空格,请添加以下条件:

if (parent.getChildAdapterPosition(view) != parent.getAdapter().getItemCount() - 1) {
            outRect.bottom = verticalSpaceHeight;
}

注意:您还可以修改outRect.topoutRect.left以及outRect.right对预期效果的性质。

分频器 ItemDecoration

扩展ItemDecoration和覆盖onDraw()方法:

public class DividerItemDecoration extends RecyclerView.ItemDecoration {

    private static final int[] ATTRS = new int[]{android.R.attr.listDivider};

    private Drawable divider;

    /**
     * Default divider will be used
     */
    public DividerItemDecoration(Context context) {
        final TypedArray styledAttributes = context.obtainStyledAttributes(ATTRS);
        divider = styledAttributes.getDrawable(0);
        styledAttributes.recycle();
    }

    /**
     * Custom divider will be used
     */
    public DividerItemDecoration(Context context, int resId) {
        divider = ContextCompat.getDrawable(context, resId);
    }

    @Override
    public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
        int left = parent.getPaddingLeft();
        int right = parent.getWidth() - parent.getPaddingRight();

        int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++) {
            View child = parent.getChildAt(i);

            RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();

            int top = child.getBottom() + params.bottomMargin;
            int bottom = top + divider.getIntrinsicHeight();

            divider.setBounds(left, top, right, bottom);
            divider.draw(c);
        }
    }
}

您可以调用第一个使用默认Android分隔符属性的构造函数,也可以调用第二个使用自己的drawable属性的构造函数,例如drawable / divider.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
       android:shape="rectangle">
    <size android:height="1dp" />
    <solid android:color="#ff992900" />
</shape>

注意:如果你想得出的分隔您的项目,覆盖onDrawOver()方法来代替。

用法

若要使用新的类添加VerticalSpaceItemDecorationDividerSpaceItemDecorationRecyclerView,例如在片段的onCreateView()方法:

private static final int VERTICAL_ITEM_SPACE = 48;
private RecyclerView recyclerView;
private LinearLayoutManager linearLayoutManager;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.fragment_feed, container, false);

    recyclerView = (RecyclerView) rootView.findViewById(R.id.fragment_home_recycler_view);
    linearLayoutManager = new LinearLayoutManager(getActivity());
    recyclerView.setLayoutManager(linearLayoutManager);

    //add ItemDecoration
    recyclerView.addItemDecoration(new VerticalSpaceItemDecoration(VERTICAL_ITEM_SPACE));
    //or
    recyclerView.addItemDecoration(new DividerItemDecoration(getActivity()));
    //or
    recyclerView.addItemDecoration(
            new DividerItemDecoration(getActivity(), R.drawable.divider));

    recyclerView.setAdapter(...);

    return rootView;
}

还有Lucas Rocha的图书馆,它应该简化项目装饰过程。虽然没试过。

功能包括:

  • 库存项目装饰品的集合,包括:
  • 项目间距水平/垂直分隔线。
  • 项目清单
作者: EyesClear 发布者: 20.11.2014 10:28

9

1833 作者的声誉

这实际上并没有解决问题,但作为临时解决方法,您可以在XML布局中的卡上设置useCompatPadding属性,使其与Lollipop前版本的测量值相同。

card_view:cardUseCompatPadding="true"
作者: Kevin Grant 发布者: 13.12.2014 08:13

143

3487 作者的声誉

简单ItemDecoration实现所有项目之间的相等空格。

public class SpacesItemDecoration extends RecyclerView.ItemDecoration {
    private int space;

    public SpacesItemDecoration(int space) {
        this.space = space;
    }

    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
        outRect.left = space;
        outRect.right = space;
        outRect.bottom = space;

        // Add top margin only for the first item to avoid double space between items
        if(parent.getChildAdapterPosition(view) == 0) {
            outRect.top = space;
        }
    }
}
作者: SergeyA 发布者: 27.12.2014 03:08

9

114 作者的声誉

为您的视图添加边距,它对我有用。

android:layout_marginTop="10dp"

如果您只想添加相等的间距并希望以XML格式进行,只需设置paddingRecyclerViewlayoutMargin您膨胀的项目相等的数量RecyclerView,然后让背景颜色确定间距颜色。

作者: Quantum Mattter 发布者: 20.02.2015 02:29

5

696 作者的声誉

从谷歌搜索中获取,将此ItemDecoration添加到您的RecyclerView

public class DividerItemDecoration extends RecyclerView.ItemDecoration {

private Drawable mDivider;
private boolean mShowFirstDivider = false;
private boolean mShowLastDivider = false;


public DividerItemDecoration(Context context, AttributeSet attrs) {
    final TypedArray a = context
            .obtainStyledAttributes(attrs, new int[]{android.R.attr.listDivider});
    mDivider = a.getDrawable(0);
    a.recycle();
}

public DividerItemDecoration(Context context, AttributeSet attrs, boolean showFirstDivider,
        boolean showLastDivider) {
    this(context, attrs);
    mShowFirstDivider = showFirstDivider;
    mShowLastDivider = showLastDivider;
}

public DividerItemDecoration(Drawable divider) {
    mDivider = divider;
}

public DividerItemDecoration(Drawable divider, boolean showFirstDivider,
        boolean showLastDivider) {
    this(divider);
    mShowFirstDivider = showFirstDivider;
    mShowLastDivider = showLastDivider;
}

@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent,
        RecyclerView.State state) {
    super.getItemOffsets(outRect, view, parent, state);
    if (mDivider == null) {
        return;
    }
    if (parent.getChildPosition(view) < 1) {
        return;
    }

    if (getOrientation(parent) == LinearLayoutManager.VERTICAL) {
        outRect.top = mDivider.getIntrinsicHeight();
    } else {
        outRect.left = mDivider.getIntrinsicWidth();
    }
}

@Override
public void onDrawOver(Canvas c, RecyclerView parent, RecyclerView.State state) {
    if (mDivider == null) {
        super.onDrawOver(c, parent, state);
        return;
    }

    // Initialization needed to avoid compiler warning
    int left = 0, right = 0, top = 0, bottom = 0, size;
    int orientation = getOrientation(parent);
    int childCount = parent.getChildCount();

    if (orientation == LinearLayoutManager.VERTICAL) {
        size = mDivider.getIntrinsicHeight();
        left = parent.getPaddingLeft();
        right = parent.getWidth() - parent.getPaddingRight();
    } else { //horizontal
        size = mDivider.getIntrinsicWidth();
        top = parent.getPaddingTop();
        bottom = parent.getHeight() - parent.getPaddingBottom();
    }

    for (int i = mShowFirstDivider ? 0 : 1; i < childCount; i++) {
        View child = parent.getChildAt(i);
        RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();

        if (orientation == LinearLayoutManager.VERTICAL) {
            top = child.getTop() - params.topMargin;
            bottom = top + size;
        } else { //horizontal
            left = child.getLeft() - params.leftMargin;
            right = left + size;
        }
        mDivider.setBounds(left, top, right, bottom);
        mDivider.draw(c);
    }

    // show last divider
    if (mShowLastDivider && childCount > 0) {
        View child = parent.getChildAt(childCount - 1);
        RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
        if (orientation == LinearLayoutManager.VERTICAL) {
            top = child.getBottom() + params.bottomMargin;
            bottom = top + size;
        } else { // horizontal
            left = child.getRight() + params.rightMargin;
            right = left + size;
        }
        mDivider.setBounds(left, top, right, bottom);
        mDivider.draw(c);
    }
}

private int getOrientation(RecyclerView parent) {
    if (parent.getLayoutManager() instanceof LinearLayoutManager) {
        LinearLayoutManager layoutManager = (LinearLayoutManager) parent.getLayoutManager();
        return layoutManager.getOrientation();
    } else {
        throw new IllegalStateException(
                "DividerItemDecoration can only be used with a LinearLayoutManager.");
    }
}
}
作者: gatlingxyz 发布者: 08.03.2015 02:14

29

11491 作者的声誉

正如我所说的那样ItemAnimators。在ItemDecorator不进入或与动画一起退出。

我只是在每个项目的项目视图布局文件中都有一个视图行。它解决了我的情况。DividerItemDecoration对于一个简单的分隔者来说,他觉得自己的巫术太多了。

<View
    android:layout_width="match_parent"
    android:layout_height="1px"
    android:layout_marginLeft="5dp"
    android:layout_marginRight="5dp"
    android:background="@color/lt_gray"/>
作者: Javanator 发布者: 16.03.2015 04:35

39

902 作者的声誉

我认为使用简单的分隔符可以帮助您

为每个项添加分隔符:
1-将其添加到可绘制目录line_divider.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<size
    android:width="1dp"
    android:height="1dp" />
<solid android:color="#999999" />
</shape>

2-创建SimpleDividerItemDecoration类
我用这个例子来定义这个类:https
//gist.github.com/polbins/e37206fbc444207c0e92

package com.example.myapp;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Canvas;
import android.graphics.drawable.Drawable;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import com.example.myapp.R;

public class SimpleDividerItemDecoration extends RecyclerView.ItemDecoration{
private Drawable mDivider;

public SimpleDividerItemDecoration(Resources resources) {
    mDivider = resources.getDrawable(R.drawable.line_divider);
}

public void onDrawOver(Canvas c, RecyclerView parent, RecyclerView.State state) {
    int left = parent.getPaddingLeft();
    int right = parent.getWidth() - parent.getPaddingRight();

    int childCount = parent.getChildCount();
    for (int i = 0; i < childCount; i++) {
        View child = parent.getChildAt(i);

        RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();

        int top = child.getBottom() + params.bottomMargin;
        int bottom = top + mDivider.getIntrinsicHeight();

        mDivider.setBounds(left, top, right, bottom);
        mDivider.draw(c);
    }
  }
}


3-在使用RecyclerView的活动或片段中,在onCreateView中添加:

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
 RecyclerView myRecyclerView = (RecyclerView) layout.findViewById(R.id.my_recycler_view);
 myRecyclerView.addItemDecoration(new SimpleDividerItemDecoration(getResources()));
 ....
 }


4-要在Items之间添加间距,
只需在项目视图中添加填充属性即可

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent"
android:padding="4dp"
>
..... item structure
</RelativeLayout>
作者: Belal mazlom 发布者: 04.04.2015 01:12

9

2390 作者的声誉

对于那些谁正在寻找只为项目之间的空间RecyclerView看到我的方法你在哪里得到的所有项目之间的间隔相等,但在我给了一个更大的填充第一项和最后一项。我只在水平方向上向左/向右应用填充,LayoutManager在垂直方向上应用向上/向下填充LayoutManager

public class PaddingItemDecoration extends RecyclerView.ItemDecoration {

    private int mPaddingPx;
    private int mPaddingEdgesPx;

    public PaddingItemDecoration(Activity activity) {
        final Resources resources = activity.getResources();
        mPaddingPx = (int) resources.getDimension(R.dimen.paddingItemDecorationDefault);
        mPaddingEdgesPx = (int) resources.getDimension(R.dimen.paddingItemDecorationEdge);
    }

    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
        super.getItemOffsets(outRect, view, parent, state);

        final int itemPosition = parent.getChildAdapterPosition(view);
        if (itemPosition == RecyclerView.NO_POSITION) {
            return;
        }
        int orientation = getOrientation(parent);
        final int itemCount = state.getItemCount();

        int left = 0;
        int top = 0;
        int right = 0;
        int bottom = 0;

        /** HORIZONTAL */
        if (orientation == LinearLayoutManager.HORIZONTAL) {
            /** all positions */
            left = mPaddingPx;
            right = mPaddingPx;

            /** first position */
            if (itemPosition == 0) {
                left += mPaddingEdgesPx;
            }
            /** last position */
            else if (itemCount > 0 && itemPosition == itemCount - 1) {
                right += mPaddingEdgesPx;
            }
        }
        /** VERTICAL */
        else {
            /** all positions */
            top = mPaddingPx;
            bottom = mPaddingPx;

            /** first position */
            if (itemPosition == 0) {
                top += mPaddingEdgesPx;
            }
            /** last position */
            else if (itemCount > 0 && itemPosition == itemCount - 1) {
                bottom += mPaddingEdgesPx;
            }
        }

        if (!isReverseLayout(parent)) {
            outRect.set(left, top, right, bottom);
        } else {
            outRect.set(right, bottom, left, top);
        }
    }

    private boolean isReverseLayout(RecyclerView parent) {
        if (parent.getLayoutManager() instanceof LinearLayoutManager) {
            LinearLayoutManager layoutManager = (LinearLayoutManager) parent.getLayoutManager();
            return layoutManager.getReverseLayout();
        } else {
            throw new IllegalStateException("PaddingItemDecoration can only be used with a LinearLayoutManager.");
        }
    }

    private int getOrientation(RecyclerView parent) {
        if (parent.getLayoutManager() instanceof LinearLayoutManager) {
            LinearLayoutManager layoutManager = (LinearLayoutManager) parent.getLayoutManager();
            return layoutManager.getOrientation();
        } else {
            throw new IllegalStateException("PaddingItemDecoration can only be used with a LinearLayoutManager.");
        }
    }
}

dimens.xml

<resources>
    <dimen name="paddingItemDecorationDefault">10dp</dimen>
    <dimen name="paddingItemDecorationEdge">20dp</dimen>
</resources>
作者: Ryan Amaral 发布者: 25.05.2015 03:41

4

150 作者的声誉

If you want to add same space for items, the simplest way is to add top+left padding for RecycleView and right+bottom margins to card items.

dimens.xml

<resources>
    <dimen name="divider">1dp</dimen>
</resources>

list_item.xml

<CardView
 android:layout_marginBottom="@dimen/divider"
 android:layout_marginRight="@dimen/divider">
 ...
</CardView>

list.xml

<RecyclerView
 android:paddingLeft="@dimen/divider"
 android:paddingTop="@dimen/divider"
/>
作者: limitium 发布者: 28.05.2015 06:14

2

1085 作者的声誉

实现自己的RecyclerView.ItemDecoration版本

public class SpacingItemDecoration extends RecyclerView.ItemDecoration {
    private int spacingPx;
    private boolean addStartSpacing;
    private boolean addEndSpacing;

    public SpacingItemDecoration(int spacingPx) {
        this(spacingPx, false, false);
    }

    public SpacingItemDecoration(int spacingPx, boolean addStartSpacing, boolean addEndSpacing) {
        this.spacingPx = spacingPx;
        this.addStartSpacing = addStartSpacing;
        this.addEndSpacing = addEndSpacing;
    }

    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
        super.getItemOffsets(outRect, view, parent, state);
        if (spacingPx <= 0) {
            return;
        }

        if (addStartSpacing && parent.getChildLayoutPosition(view) < 1 || parent.getChildLayoutPosition(view) >= 1) {
            if (getOrientation(parent) == LinearLayoutManager.VERTICAL) {
                outRect.top = spacingPx;
            } else {
                outRect.left = spacingPx;
            }
        }

        if (addEndSpacing && parent.getChildAdapterPosition(view) == getTotalItemCount(parent) - 1) {
            if (getOrientation(parent) == LinearLayoutManager.VERTICAL) {
                outRect.bottom = spacingPx;
            } else {
                outRect.right = spacingPx;
            }
        }
    }

    private int getTotalItemCount(RecyclerView parent) {
        return parent.getAdapter().getItemCount();
    }

    private int getOrientation(RecyclerView parent) {
        if (parent.getLayoutManager() instanceof LinearLayoutManager) {
            return ((LinearLayoutManager) parent.getLayoutManager()).getOrientation();
        } else {
            throw new IllegalStateException("SpacingItemDecoration can only be used with a LinearLayoutManager.");
        }
    }
}
作者: e.shishkin 发布者: 24.06.2015 05:09

101

16907 作者的声誉

简单的一个是为RecyclerView设置背景颜色,为项目设置不同的背景颜色。这是一个例子......

<android.support.v7.widget.RecyclerView
    android:background="#ECEFF1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:scrollbars="vertical"/>

TextView项(它可以是任何东西),底边距为“x”dp或px。

<TextView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginBottom="1dp"
    android:background="#FFFFFF"/>

输出 ...

在此输入图像描述

作者: Madan Sapkota 发布者: 05.07.2015 03:59

2

1437 作者的声誉

RecyclerView距离有点不同ListView。实际上,RecyclerView需要一个ListView类似的结构。例如,a LinearLayout。的LinearLayout具有用于每个元件分割参数。在下面的代码中,我有一个带有“填充” RecyclerViewCardView对象LinearLayout,它们会在项目之间放置一些空格。让那个空间真的很小,你得到一条线。

这是recyclerview_layout.xml中的Recycler视图

<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="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".ToDoList">

    <!-- A RecyclerView with some commonly used attributes -->
    <android.support.v7.widget.RecyclerView
        android:id="@+id/todo_recycler_view"
        android:scrollbars="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</RelativeLayout>

以下是每个项目的外观(并且由于android:padding在LinearLayout中包围所有内容而显示为分开。)在另一个文件中:cards_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent"
    **android:padding="@dimen/activity_vertical_margin"**>
    <!-- A CardView that contains a TextView -->
    <android.support.v7.widget.CardView
        xmlns:card_view="http://schemas.android.com/apk/res-auto"
        android:id="@+id/card_view"
        android:layout_gravity="center"
        android:layout_width="match_parent"
        android:layout_height="100dp"
        android:elevation="30dp"
        card_view:cardElevation="3dp">
            <TextView
                android:id="@+id/info_text"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                />
    </android.support.v7.widget.CardView>
</LinearLayout>
作者: fiacobelli 发布者: 25.07.2015 05:33

10

1778 作者的声誉

  • 这是添加分频器的简单黑客
  • 只需在回收器项目的布局中添加背景,如下所示

    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/shape_border"
        android:gravity="center"
        android:orientation="horizontal"
        android:padding="5dp">
    
    <ImageView
        android:id="@+id/imageViewContactLogo"
        android:layout_width="60dp"
        android:layout_height="60dp"
        android:layout_marginRight="10dp"
        android:src="@drawable/ic_user" />
    
    <LinearLayout
        android:id="@+id/linearLayout"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="0.92"
        android:gravity="center|start"
        android:orientation="vertical">
    
    <TextView
        android:id="@+id/textViewContactName"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:singleLine="true"
        android:text="Large Text"
        android:textAppearance="?android:attr/textAppearanceLarge" />
    
    <TextView
        android:id="@+id/textViewStatusOrNumber"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="5dp"
        android:singleLine="true"
        android:text=""
        android:textAppearance="?android:attr/textAppearanceMedium" />
    </LinearLayout>
    
    <TextView
        android:id="@+id/textViewUnreadCount"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginRight="10dp"
        android:padding="5dp"
        android:text=""
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:textColor="@color/red"
        android:textSize="22sp" />
    
    <Button
        android:id="@+id/buttonInvite"
        android:layout_width="54dp"
        android:layout_height="wrap_content"
        android:background="@drawable/ic_add_friend" />
    </LinearLayout>
    

在drawable文件夹中创建以下shape_border.xml

  <?xml version="1.0" encoding="utf-8"?>
    <shape xmlns:android="http://schemas.android.com/apk/res/android"
      android:shape="rectangle" >
       <gradient
        android:angle="270"
        android:centerColor="@android:color/transparent"
        android:centerX="0.01"
        android:startColor="#000" />
    </shape>

这是最终结果 - 带分频器的RecyclerView。

这是最终结果 - 带分频器的RecyclerView。

作者: turbandroid 发布者: 30.07.2015 09:36

8

3498 作者的声誉

我从旧的gist中分叉了DividerItemDecoration,并将其简化为适合我的用例,我还修改了它以在ListView中绘制它们的方式绘制分隔符,包括最后一个列表项后面的分隔符。这也将处理垂直ItemAnimator动画:

1)将此类添加到您的项目中:

public class DividerItemDecoration extends RecyclerView.ItemDecoration {
    private static final int[] ATTRS = new int[]{android.R.attr.listDivider};
    private Drawable divider;

    public DividerItemDecoration(Context context) {
        try {
            final TypedArray a = context.obtainStyledAttributes(ATTRS);
            divider = a.getDrawable(0);
            a.recycle();
        } catch (Resources.NotFoundException e) {
            // TODO Log or handle as necessary.
        }
    }

    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
        super.getItemOffsets(outRect, view, parent, state);
        if (divider == null) return;
        if (parent.getChildAdapterPosition(view) < 1) return;

        if (getOrientation(parent) == LinearLayoutManager.VERTICAL)
            outRect.top = divider.getIntrinsicHeight();
        else
            throw new IllegalArgumentException("Only usable with vertical lists");
    }

    @Override
    public void onDrawOver(Canvas c, RecyclerView parent, RecyclerView.State state) {
        if (divider == null) {
            super.onDrawOver(c, parent, state);
            return;
        }

        final int left = parent.getPaddingLeft();
        final int right = parent.getWidth() - parent.getPaddingRight();
        final int childCount = parent.getChildCount();

        for (int i = 0; i < childCount; ++i) {
            final View child = parent.getChildAt(i);
            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
            final int size = divider.getIntrinsicHeight();
            final int top = (int) (child.getTop() - params.topMargin - size + child.getTranslationY());
            final int bottom = top + size;
            divider.setBounds(left, top, right, bottom);
            divider.draw(c);

            if (i == childCount - 1) {
                final int newTop = (int) (child.getBottom() + params.bottomMargin + child.getTranslationY());
                final int newBottom = newTop + size;
                divider.setBounds(left, newTop, right, newBottom);
                divider.draw(c);
            }
        }
    }

    private int getOrientation(RecyclerView parent) {
        if (!(parent.getLayoutManager() instanceof LinearLayoutManager))
            throw new IllegalStateException("Layout manager must be an instance of LinearLayoutManager");
        return ((LinearLayoutManager) parent.getLayoutManager()).getOrientation();
    }
}

2)将装饰器添加到RecylerView:

recyclerView.addItemDecoration(new DividerItemDecoration(getActivity()));
作者: Learn OpenGL ES 发布者: 04.08.2015 08:41

5

5840 作者的声誉

这个链接对我来说就像一个魅力:

https://gist.github.com/lapastillaroja/858caf1a82791b6c1a36

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.AttributeSet;
import android.view.View;

public class DividerItemDecoration extends RecyclerView.ItemDecoration {

    private Drawable mDivider;
    private boolean mShowFirstDivider = false;
    private boolean mShowLastDivider = false;


    public DividerItemDecoration(Context context, AttributeSet attrs) {
        final TypedArray a = context
                .obtainStyledAttributes(attrs, new int[]{android.R.attr.listDivider});
        mDivider = a.getDrawable(0);
        a.recycle();
    }

    public DividerItemDecoration(Context context, AttributeSet attrs, boolean showFirstDivider,
            boolean showLastDivider) {
        this(context, attrs);
        mShowFirstDivider = showFirstDivider;
        mShowLastDivider = showLastDivider;
    }

    public DividerItemDecoration(Drawable divider) {
        mDivider = divider;
    }

    public DividerItemDecoration(Drawable divider, boolean showFirstDivider,
            boolean showLastDivider) {
        this(divider);
        mShowFirstDivider = showFirstDivider;
        mShowLastDivider = showLastDivider;
    }

    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent,
            RecyclerView.State state) {
        super.getItemOffsets(outRect, view, parent, state);
        if (mDivider == null) {
            return;
        }
        if (parent.getChildPosition(view) < 1) {
            return;
        }

        if (getOrientation(parent) == LinearLayoutManager.VERTICAL) {
            outRect.top = mDivider.getIntrinsicHeight();
        } else {
            outRect.left = mDivider.getIntrinsicWidth();
        }
    }

    @Override
    public void onDrawOver(Canvas c, RecyclerView parent, RecyclerView.State state) {
        if (mDivider == null) {
            super.onDrawOver(c, parent, state);
            return;
        }

        // Initialization needed to avoid compiler warning
        int left = 0, right = 0, top = 0, bottom = 0, size;
        int orientation = getOrientation(parent);
        int childCount = parent.getChildCount();

        if (orientation == LinearLayoutManager.VERTICAL) {
            size = mDivider.getIntrinsicHeight();
            left = parent.getPaddingLeft();
            right = parent.getWidth() - parent.getPaddingRight();
        } else { //horizontal
            size = mDivider.getIntrinsicWidth();
            top = parent.getPaddingTop();
            bottom = parent.getHeight() - parent.getPaddingBottom();
        }

        for (int i = mShowFirstDivider ? 0 : 1; i < childCount; i++) {
            View child = parent.getChildAt(i);
            RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();

            if (orientation == LinearLayoutManager.VERTICAL) {
                top = child.getTop() - params.topMargin;
                bottom = top + size;
            } else { //horizontal
                left = child.getLeft() - params.leftMargin;
                right = left + size;
            }
            mDivider.setBounds(left, top, right, bottom);
            mDivider.draw(c);
        }

        // show last divider
        if (mShowLastDivider && childCount > 0) {
            View child = parent.getChildAt(childCount - 1);
            RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
            if (orientation == LinearLayoutManager.VERTICAL) {
                top = child.getBottom() + params.bottomMargin;
                bottom = top + size;
            } else { // horizontal
                left = child.getRight() + params.rightMargin;
                right = left + size;
            }
            mDivider.setBounds(left, top, right, bottom);
            mDivider.draw(c);
        }
    }

    private int getOrientation(RecyclerView parent) {
        if (parent.getLayoutManager() instanceof LinearLayoutManager) {
            LinearLayoutManager layoutManager = (LinearLayoutManager) parent.getLayoutManager();
            return layoutManager.getOrientation();
        } else {
            throw new IllegalStateException(
                    "DividerItemDecoration can only be used with a LinearLayoutManager.");
        }
    }
}

Then in your activity:

mCategoryRecyclerView.addItemDecoration(
    new DividerItemDecoration(this, null));

Or this if you are using a fragment:

mCategoryRecyclerView.addItemDecoration(
    new DividerItemDecoration(getActivity(), null));
作者: Micro 发布者: 21.08.2015 04:33

5

1201 作者的声誉

We can decorate the items using various decorators attached to the recyclerview such as the DividerItemDecoration:

Simply use the following ...taken from the answer by EyesClear

public class DividerItemDecoration extends RecyclerView.ItemDecoration {

private static final int[] ATTRS = new int[]{android.R.attr.listDivider};

private Drawable mDivider;

/**
 * Default divider will be used
 */
public DividerItemDecoration(Context context) {
    final TypedArray styledAttributes = context.obtainStyledAttributes(ATTRS);
    mDivider = styledAttributes.getDrawable(0);
    styledAttributes.recycle();
}

/**
 * Custom divider will be used
 */
public DividerItemDecoration(Context context, int resId) {
    mDivider = ContextCompat.getDrawable(context, resId);
}

@Override
public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
    int left = parent.getPaddingLeft();
    int right = parent.getWidth() - parent.getPaddingRight();

    int childCount = parent.getChildCount();
    for (int i = 0; i < childCount; i++) {
        View child = parent.getChildAt(i);

        RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();

        int top = child.getBottom() + params.bottomMargin;
        int bottom = top + mDivider.getIntrinsicHeight();

        mDivider.setBounds(left, top, right, bottom);
        mDivider.draw(c);
    }
}

} and then use the above as follows

RecyclerView.ItemDecoration itemDecoration = new DividerItemDecoration(this, DividerItemDecoration.VERTICAL_LIST);
recyclerView.addItemDecoration(itemDecoration);

This will display dividers between each item within the list as shown below:

在此输入图像描述

And for those of who are looking for more details can check out this guide Using the RecyclerView _ CodePath Android Cliffnotes

Some answers here suggest the use of margins but the catch is that : If you add both top and bottom margins, they will appear both added between items and they will be too large. If you only add either, there will be no margin either at the top or the bottom of the whole list. If you add half of the distance at the top, half at the bottom, the outer margins will be too small.

Thus, the only aesthetically correct solution is the divider that the system knows where to apply properly: between items but not above or below items.

Please let me know of any doubts in the comments below :)

作者: Anudeep Samaiya 发布者: 20.09.2015 12:40

22

13780 作者的声誉

由于没有正确的方法来使用Material Design正确实现这一点,我只是通过以下技巧直接在列表项上添加分隔符:

<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="@color/dividerColor"/>
作者: Yoann Hercouet 发布者: 13.04.2016 06:22

4

671 作者的声誉

I have added a line in list item like below

<View
android:id="@+id/divider"
android:layout_width="match_parent"
android:layout_height="1px"
android:background="@color/dividerColor"/>

1px will draw the thin line.

如果要隐藏最后一行的分隔符,则divider.setVisiblity(View.GONE);在onBindViewHolder上隐藏最后一个列表项。

作者: Raja Peela 发布者: 01.07.2016 11:49

3

3304 作者的声誉

一个非常简单的解决方案是使用RecyclerView-FlexibleDivider

添加依赖:

compile 'com.yqritc:recyclerview-flexibledivider:1.4.0'

添加到您的recyclerview:

recyclerView.addItemDecoration(new HorizontalDividerItemDecoration.Builder(context).build());

而且你已经完成了!

作者: Cristan 发布者: 22.09.2016 12:38

14

611 作者的声誉

2016年10月更新

使用支持库v25.0.0,最终可以使用基本水平和垂直分隔线的默认实现!

https://developer.android.com/reference/android/support/v7/widget/DividerItemDecoration.html

作者: friday 发布者: 20.10.2016 08:12

386

6912 作者的声誉

只需添加

recyclerView.addItemDecoration(new DividerItemDecoration(getContext(),
                DividerItemDecoration.VERTICAL));

您还可能需要添加依赖项
compile 'com.android.support:recyclerview-v7:27.1.0'

编辑:

为了自定义它,您可以添加自定义drawable:

DividerItemDecoration itemDecorator = new DividerItemDecoration(getContext(), DividerItemDecoration.VERTICAL);
itemDecorator.setDrawable(ContextCompat.getDrawable(getContext(), R.drawable.divider));

您可以自由使用任何自定义drawable,例如:

<shape xmlns:android="http://schemas.android.com/apk/res/android"
       android:shape="rectangle">
    <solid android:color="@color/colorPrimary"/>
    <size android:height="0.5dp"/>
</shape>
作者: Leo Droidcoder 发布者: 17.12.2016 06:40

4

566 作者的声誉

太迟了,但GridLayoutManager我用这个:

public class GridSpacesItemDecoration : RecyclerView.ItemDecoration
{
    private int space;

    public GridSpacesItemDecoration(int space) {
        this.space = space;
    }

    public override void GetItemOffsets(Android.Graphics.Rect outRect, View view, RecyclerView parent, RecyclerView.State state)
    {
        var position = parent.GetChildLayoutPosition(view);

        /// Only for GridLayoutManager Layouts
        var manager = parent.GetLayoutManager() as GridLayoutManager;

        if (parent.GetChildLayoutPosition(view) < manager.SpanCount)
            outRect.Top = space;

        if (position % 2 != 0) {
            outRect.Right = space;
        }

        outRect.Left = space;
        outRect.Bottom = space;
    }
}

这项工作适用于任何跨度计数。

奥利。

作者: Ollie Strevel 发布者: 10.01.2017 07:32

4

942 作者的声誉

您可以轻松地以编程方式添加。

如果您的布局管理器是Linearlayout,那么您可以使用:

DividerItemDecoration是一个RecyclerView.ItemDecoration,可用作LinearLayoutManager项目之间的分隔符。它支持HORIZONTAL和VERTICAL方向。

 mDividerItemDecoration = new DividerItemDecoration(recyclerView.getContext(),
         mLayoutManager.getOrientation());
 recyclerView.addItemDecoration(mDividerItemDecoration);

资源

作者: Beyaz 发布者: 22.01.2017 06:48

3

357 作者的声誉

1.其中一种方法是通过一起使用cardview和Recycler视图, 我们可以轻松添加分隔器等效果。恩。https://developer.android.com/training/material/lists-cards.html

2.另一种是通过将视图作为分隔符添加到回收器视图的list_item_layout

        <View
            android:id="@+id/view1"
            android:layout_width="match_parent"
            android:layout_height="1dp"
            android:background="@color/colorAccent" />
作者: vicky 发布者: 31.01.2017 08:43

3

588 作者的声誉

public class CommonItemSpaceDecoration extends RecyclerView.ItemDecoration {
    private int mSpace = 0;
    private boolean mVerticalOrientation = true;

    public CommonItemSpaceDecoration(int space) {
        this.mSpace = space;
    }

    public CommonItemSpaceDecoration(int space, boolean verticalOrientation) {
        this.mSpace = space;
        this.mVerticalOrientation = verticalOrientation;
    }

    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
        outRect.top = SizeUtils.dp2px(view.getContext(), mSpace);
        if (mVerticalOrientation) {
            if (parent.getChildAdapterPosition(view) == 0) {
                outRect.set(0, SizeUtils.dp2px(view.getContext(), mSpace), 0, SizeUtils.dp2px(view.getContext(), mSpace));
            } else {
                outRect.set(0, 0, 0, SizeUtils.dp2px(view.getContext(), mSpace));
            }
        } else {
            if (parent.getChildAdapterPosition(view) == 0) {
                outRect.set(SizeUtils.dp2px(view.getContext(), mSpace), 0, 0, 0);
            } else {
                outRect.set(SizeUtils.dp2px(view.getContext(), mSpace), 0, SizeUtils.dp2px(view.getContext(), mSpace), 0);
            }
        }


    }
}

这将在每个项目的顶部和底部(或左侧和右侧)添加空间。然后您可以将其设置为recyclerView。

recyclerView.addItemDecoration(new CommonItemSpaceDecoration(16));

SizeUtils.java

public class SizeUtils {
    public static int dp2px(Context context, float dpValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (dpValue * scale + 0.5f);
    }
}
作者: wizChen 发布者: 11.02.2017 06:16

13

1176 作者的声誉

如果有人想要仅添加项目之间的10dp间距,则可以通过将drawable设置为DividerItemDecoration

DividerItemDecoration dividerItemDecoration = new DividerItemDecoration(
    recyclerView.getContext(),
    layoutManager.getOrientation()
);

dividerItemDecoration.setDrawable(
    ContextCompat.getDrawable(getContext(), R.drawable.divider_10dp)
); 

divider_10dp可绘制资源在哪里包含:

<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle">
    <size android:height="10dp"/>
    <solid android:color="@android:color/transparent"/>
</shape>
作者: Praveen Singh 发布者: 17.02.2017 01:12

17

304 作者的声誉

这很简单,你不需要这么复杂的代码

DividerItemDecoration divider = new 
DividerItemDecoration(mRVMovieReview.getContext(), 
DividerItemDecoration.VERTICAL);
divider.setDrawable(
    ContextCompat.getDrawable(getBaseContext(), R.drawable.line_divider)
);
mRVMovieReview.addItemDecoration(divider);

在drawable:line_divider.xml中添加它

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" 
  android:shape="rectangle">
    <size android:height="1dp" />
    <solid android:color="@android:color/black" />
</shape>
作者: Faheem 发布者: 28.08.2017 07:48

4

1360 作者的声誉

我觉得需要一个不使用XML的简单,基于代码的答案

DividerItemDecoration dividerItemDecoration = new DividerItemDecoration(recyclerView.getContext(), DividerItemDecoration.VERTICAL);

ShapeDrawable shapeDrawableForDivider = new ShapeDrawable(new RectShape());

int dividerThickness = // (int) (SomeOtherView.getHeight() * desiredPercent);
shapeDrawableForDivider.setIntrinsicHeight(dividerThickness);
shapeDrawableForDivider.setAlpha(0);

dividerItemDecoration.setDrawable(shapeDrawableForDivider);

recyclerView.addItemDecoration(dividerItemDecoration);
作者: Boober Bunz 发布者: 26.09.2018 07:51

3

22769 作者的声誉

而不是创建一个shape xml更改分隔线的高度和颜色。你可以像编程一样创建

val divider = DividerItemDecoration(context,
        DividerItemDecoration.VERTICAL)

divider.setDrawable(ShapeDrawable().apply {
    intrinsicHeight = resources.getDimensionPixelOffset(R.dimen.dp_15)
    paint.color = Color.RED // note: currently (support version 28.0.0), we can not use tranparent color here, if we use transparent, we still see a small divider line. So if we want to display transparent space, we can set color = background color or we can create a custom ItemDecoration instead of DividerItemDecoration. 
})

recycler_devices.addItemDecoration(divider)
作者: Phan Van Linh 发布者: 29.01.2019 09:52
32x32