如何添加分隔线在RecyclerView android系统中？ [英] how to add divider line in RecyclerView in android?

问题描述

我开发一个Android应用程序，其中我使用 RecyclerView 。我需要添加一个分在 RecyclerView 。 我搜索了很多，但没有找到任何合适的回答。我尝试添加 -

  recyclerView.addItemDecoration（新
     DividerItemDecoration（getActivity（），
       DividerItemDecoration.VERTICAL_LIST））;
 

下面是我的xml code -

 ＆LT; android.support.v7.widget.RecyclerView
    机器人：ID =@ + ID / drawerList
    机器人：layout_width =match_parent
    机器人：layout_height =WRAP_CONTENT
    机器人：layout_marginTop =15dp
    /＆GT;
 

解决方案

正确的方法是定义 ItemDecoration 为 RecyclerView 是如下

SimpleDividerItemDecoration.java

 公共类SimpleDividerItemDecoration扩展RecyclerView.ItemDecoration {
    私人绘制对象mDivider;

    公共SimpleDividerItemDecoration（上下文的背景下）{
        mDivider = context.getResources（）getDrawable（R.drawable.line_divider）。
    }

    @覆盖
    公共无效onDrawOver（帆布C，RecyclerView父母，RecyclerView.State州）{
        INT左= parent.getPaddingLeft（）;
        INT右= parent.getWidth（） -  parent.getPaddingRight（）;

        INT childCount = parent.getChildCount（）;
        的for（int i = 0; I＆LT; childCount;我++）{
            查看孩子= parent.getChildAt（我）;

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

            INT顶= child.getBottom（）+ params.bottomMargin;
            INT底=顶部+ mDivider.getIntrinsicHeight（）;

            mDivider.setBounds（左，上，右，下）;
            mDivider.draw（C）;
        }
    }
}
 

line_divider.xml：

 ＆LT; XML版本=1.0编码=UTF-8＆GT？;
＆LT;形状的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android
    机器人：形状=矩形＆GT;

    ＆LT;大小
        机器人：宽=1DP
        机器人：身高=1DP/＆GT;

    [固体机器人：颜色=@色/ dark_gray/＆GT;

＆LT; /形状＆GT;
 

最后这样设置

  recyclerView.addItemDecoration（新SimpleDividerItemDecoration（本））;
 

I am developing an android application where I am using RecyclerView. I need to add a divider in RecyclerView. I search a lot but did not find any proper answer. I tried to add -

recyclerView.addItemDecoration(new
     DividerItemDecoration(getActivity(),
       DividerItemDecoration.VERTICAL_LIST));

below is my xml code -

   <android.support.v7.widget.RecyclerView
    android:id="@+id/drawerList"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="15dp"
    />

解决方案

The Right way is to define ItemDecoration for the RecyclerView is as following

SimpleDividerItemDecoration.java

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

    public SimpleDividerItemDecoration(Context context) {
        mDivider = context.getResources().getDrawable(R.drawable.line_divider);
    }

    @Override
    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);
        }
    }
}

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="@color/dark_gray" />

</shape>

Finally set it like this

recyclerView.addItemDecoration(new SimpleDividerItemDecoration(this));

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