RecyclerView怎么修改分割线？

Question

styles.xml做如下修改:

<style name="AppBaseTheme" parent="android:Theme.Light"></style>

    <!-- Application theme. -->
    <style name="AppTheme" parent="AppBaseTheme">

        <!-- 修改分割线样式-->
        <item name="android:listDivider">@drawable/s</item>

    </style>

@draweble/s代码如下：

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

    <gradient
        android:centerColor="#ff00ff00"
        android:endColor="#ff0000ff"
        android:startColor="#ffff0000"
        android:type="linear" />
    <size android:height="4dp"/>

</shape>

MyItemDecoration代码如下：

package com.wuzhiqiang.learnswiperefreshlayout;

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

/**
 * Created by mfpc on 2015/11/2.
 */
public class MyItemDecoration extends RecyclerView.ItemDecoration
{
    private static final int[] ATTRS = {android.R.attr.listDivider};
    private Drawable mDivider;
    public MyItemDecoration(Context context)
    {
        TypedArray array = context.obtainStyledAttributes(ATTRS);
        // 获取分隔条
        mDivider = array.getDrawable(0);
        array.recycle();
    }
    @Override
    public void onDrawOver(Canvas c, RecyclerView parent, RecyclerView.State state)
    {
        super.onDrawOver(c, parent, state);
        int count = parent.getChildCount();
        int left = parent.getPaddingLeft();
        int right = parent.getWidth()-parent.getPaddingRight();
        for(int i = 0; i < count; i++)
        {
            View v = parent.getChildAt(i);
            RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) v.getLayoutParams();
            int top = v.getBottom() + params.bottomMargin;
            int bottom = top + mDivider.getIntrinsicHeight();
            mDivider.setBounds(left,top,right,bottom);
            mDivider.draw(c);
        }
    }
}

但是中间出错了：

@drawabel/s文件应该怎么写？或者使其他地方有问题？

Answer 1

应为 RecyclerView 和 LayoutManager 是分离的，所以没有分割线属性，可以用 RecyclerView.ItemDecoration 进行分割线的绘制。

提供一个简单的装饰

/**
 * 分隔线装饰
 *
 * @author youmingdot
 */
public class DividerLine extends RecyclerView.ItemDecoration {
    /**
     * 水平方向
     */
    public static final int HORIZONTAL = LinearLayoutManager.HORIZONTAL;

    /**
     * 垂直方向
     */
    public static final int VERTICAL = LinearLayoutManager.VERTICAL;

    // 画笔
    private Paint paint;

    // 布局方向
    private int orientation;
    // 分割线颜色
    private int color;
    // 分割线尺寸
    private int size;

    public DividerLine() {
        this(VERTICAL);
    }

    public DividerLine(int orientation) {
        this.orientation = orientation;

        paint = new Paint();
    }

    @Override
    public void onDrawOver(Canvas c, RecyclerView parent, RecyclerView.State state) {
        super.onDrawOver(c, parent, state);

        if (orientation == VERTICAL) {
            drawHorizontal(c, parent);
        } else {
            drawVertical(c, parent);
        }
    }

    /**
     * 设置分割线颜色
     *
     * @param color 颜色
     */
    public void setColor(int color) {
        this.color = color;
        paint.setColor(color);
    }

    /**
     * 设置分割线尺寸
     *
     * @param size 尺寸
     */
    public void setSize(int size) {
        this.size = size;
    }

    // 绘制垂直分割线
    protected void drawVertical(Canvas c, RecyclerView parent) {
        final int top = parent.getPaddingTop();
        final int bottom = parent.getHeight() - parent.getPaddingBottom();

        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 left = child.getRight() + params.rightMargin;
            final int right = left + size;

            c.drawRect(left, top, right, bottom, paint);
        }
    }

    // 绘制水平分割线
    protected void drawHorizontal(Canvas c, RecyclerView parent) {
        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 top = child.getBottom() + params.bottomMargin;
            final int bottom = top + size;

            c.drawRect(left, top, right, bottom, paint);
        }
    }
}

使用方法

DividerLine dividerLine = new DividerLine(DividerLine.VERTICAL);
dividerLine.setSize(1);
dividerLine.setColor(0xFFDDDDDD);
recyclerView.addItemDecoration(dividerLine);