RecycleView 简单设置分割线

先上效果

直接上代码

• 使用默认方式

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

• 使用自定义颜色及高度（通过shape 控制颜色及高度）

DividerItemDecoration dividerItemDecoration = new DividerItemDecoration(mContext, DividerItemDecoration.VERTICAL);        dividerItemDecoration.setDrawable(ContextCompat.getDrawable(mContext, R.drawable.shape_recycleview_divider));        recyclerView.addItemDecoration(dividerItemDecoration);

R.drawable.shape_recycleview_divider

<?xml version="1.0" encoding="utf-8"?><shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle">    <solid android:color="#F3F5F7"/>    <size android:height="2dp"/></shape>

DividerItemDecoration源码

/* * Copyright (C) 2016 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * *      http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package android.support.v7.widget;import android.annotation.SuppressLint;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.annotation.NonNull;import android.support.v4.view.ViewCompat;import android.view.View;import android.widget.LinearLayout;/** * DividerItemDecoration is a {@link RecyclerView.ItemDecoration} that can be used as a divider * between items of a {@link LinearLayoutManager}. It supports both {@link #HORIZONTAL} and * {@link #VERTICAL} orientations. * * <pre> *     mDividerItemDecoration = new DividerItemDecoration(recyclerView.getContext(), *             mLayoutManager.getOrientation()); *     recyclerView.addItemDecoration(mDividerItemDecoration); * </pre> */public class DividerItemDecoration extends RecyclerView.ItemDecoration {    public static final int HORIZONTAL = LinearLayout.HORIZONTAL;    public static final int VERTICAL = LinearLayout.VERTICAL;    private static final int[] ATTRS = new int[]{ android.R.attr.listDivider };    private Drawable mDivider;    /**     * Current orientation. Either {@link #HORIZONTAL} or {@link #VERTICAL}.     */    private int mOrientation;    private final Rect mBounds = new Rect();    /**     * Creates a divider {@link RecyclerView.ItemDecoration} that can be used with a     * {@link LinearLayoutManager}.     *     * @param context Current context, it will be used to access resources.     * @param orientation Divider orientation. Should be {@link #HORIZONTAL} or {@link #VERTICAL}.     */    public DividerItemDecoration(Context context, int orientation) {        final TypedArray a = context.obtainStyledAttributes(ATTRS);        mDivider = a.getDrawable(0);        a.recycle();        setOrientation(orientation);    }    /**     * Sets the orientation for this divider. This should be called if     * {@link RecyclerView.LayoutManager} changes orientation.     *     * @param orientation {@link #HORIZONTAL} or {@link #VERTICAL}     */    public void setOrientation(int orientation) {        if (orientation != HORIZONTAL && orientation != VERTICAL) {            throw new IllegalArgumentException(                    "Invalid orientation. It should be either HORIZONTAL or VERTICAL");        }        mOrientation = orientation;    }    /**     * Sets the {@link Drawable} for this divider.     *     * @param drawable Drawable that should be used as a divider.     */    public void setDrawable(@NonNull Drawable drawable) {        if (drawable == null) {            throw new IllegalArgumentException("Drawable cannot be null.");        }        mDivider = drawable;    }    @Override    public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {        if (parent.getLayoutManager() == null) {            return;        }        if (mOrientation == VERTICAL) {            drawVertical(c, parent);        } else {            drawHorizontal(c, parent);        }    }    @SuppressLint("NewApi")    private void drawVertical(Canvas canvas, RecyclerView parent) {        canvas.save();        final int left;        final int right;        if (parent.getClipToPadding()) {            left = parent.getPaddingLeft();            right = parent.getWidth() - parent.getPaddingRight();            canvas.clipRect(left, parent.getPaddingTop(), right,                    parent.getHeight() - parent.getPaddingBottom());        } else {            left = 0;            right = parent.getWidth();        }        final int childCount = parent.getChildCount();        for (int i = 0; i < childCount; i++) {            final View child = parent.getChildAt(i);            parent.getDecoratedBoundsWithMargins(child, mBounds);            final int bottom = mBounds.bottom + Math.round(ViewCompat.getTranslationY(child));            final int top = bottom - mDivider.getIntrinsicHeight();            mDivider.setBounds(left, top, right, bottom);            mDivider.draw(canvas);        }        canvas.restore();    }    @SuppressLint("NewApi")    private void drawHorizontal(Canvas canvas, RecyclerView parent) {        canvas.save();        final int top;        final int bottom;        if (parent.getClipToPadding()) {            top = parent.getPaddingTop();            bottom = parent.getHeight() - parent.getPaddingBottom();            canvas.clipRect(parent.getPaddingLeft(), top,                    parent.getWidth() - parent.getPaddingRight(), bottom);        } else {            top = 0;            bottom = parent.getHeight();        }        final int childCount = parent.getChildCount();        for (int i = 0; i < childCount; i++) {            final View child = parent.getChildAt(i);            parent.getLayoutManager().getDecoratedBoundsWithMargins(child, mBounds);            final int right = mBounds.right + Math.round(ViewCompat.getTranslationX(child));            final int left = right - mDivider.getIntrinsicWidth();            mDivider.setBounds(left, top, right, bottom);            mDivider.draw(canvas);        }        canvas.restore();    }    @Override    public void getItemOffsets(Rect outRect, View view, RecyclerView parent,            RecyclerView.State state) {        if (mOrientation == VERTICAL) {            outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());        } else {            outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);        }    }}