RecyclerView分割线

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效果图：

使用方法：

添加默认分割线：高度为2px，颜色为灰色

1 mRecyclerView.addItemDecoration(new RecyclerViewDivider(mContext, LinearLayoutManager.VERTICAL));

添加自定义分割线：可自定义分割线drawable

1 mRecyclerView.addItemDecoration(new RecyclerViewDivider(2     mContext, LinearLayoutManager.VERTICAL, R.drawable.divider_mileage));

添加自定义分割线：可自定义分割线高度和颜色

1 mRecyclerView.addItemDecoration(new RecyclerViewDivider(2     mContext, LinearLayoutManager.VERTICAL, 10, ContextCompat.getColor(mContext, R.color.divide_gray_color)));

万能分割线登场：

  1 package utils;  2   3 import android.content.Context;  4 import android.content.res.TypedArray;  5 import android.graphics.Canvas;  6 import android.graphics.Paint;  7 import android.graphics.Rect;  8 import android.graphics.drawable.Drawable;  9 import android.support.v4.content.ContextCompat; 10 import android.support.v7.widget.LinearLayoutManager; 11 import android.support.v7.widget.RecyclerView; 12 import android.view.View; 13  14 /** 15  * Created by ${火龙裸先生} on 2016/10/29. 16  * 邮箱：791335000@qq.com 17  */ 18 public class RecyclerViewDivider extends RecyclerView.ItemDecoration { 19     private Paint mPaint; 20     private Drawable mDivider; 21     private int mDividerHeight = 2;//分割线高度，默认为1px 22     private int mOrientation;//列表的方向：LinearLayoutManager.VERTICAL或LinearLayoutManager.HORIZONTAL 23     private static final int[] ATTRS = new int[]{android.R.attr.listDivider}; 24  25     /** 26      * 默认分割线：高度为2px，颜色为灰色 27      * 28      * @param context 29      * @param orientation 列表方向 30      */ 31     public RecyclerViewDivider(Context context, int orientation) { 32         if (orientation != LinearLayoutManager.VERTICAL && orientation != LinearLayoutManager.HORIZONTAL) { 33             throw new IllegalArgumentException("请输入正确的参数！"); 34         } 35         mOrientation = orientation; 36  37         final TypedArray a = context.obtainStyledAttributes(ATTRS); 38         mDivider = a.getDrawable(0); 39         a.recycle(); 40     } 41  42     /** 43      * 自定义分割线 44      * 45      * @param context 46      * @param orientation 列表方向 47      * @param drawableId  分割线图片 48      */ 49     public RecyclerViewDivider(Context context, int orientation, int drawableId) { 50         this(context, orientation); 51         mDivider = ContextCompat.getDrawable(context, drawableId); 52         mDividerHeight = mDivider.getIntrinsicHeight(); 53     } 54  55     /** 56      * 自定义分割线 57      * 58      * @param context 59      * @param orientation   列表方向 60      * @param dividerHeight 分割线高度 61      * @param dividerColor  分割线颜色 62      */ 63     public RecyclerViewDivider(Context context, int orientation, int dividerHeight, int dividerColor) { 64         this(context, orientation); 65         mDividerHeight = dividerHeight; 66         mPaint = new Paint(Paint.ANTI_ALIAS_FLAG); 67         mPaint.setColor(dividerColor); 68         mPaint.setStyle(Paint.Style.FILL); 69     } 70  71  72     //获取分割线尺寸 73     @Override 74     public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) { 75         super.getItemOffsets(outRect, view, parent, state); 76         outRect.set(0, 0, 0, mDividerHeight); 77     } 78  79     //绘制分割线 80     @Override 81     public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) { 82         super.onDraw(c, parent, state); 83         if (mOrientation == LinearLayoutManager.VERTICAL) { 84             drawVertical(c, parent); 85         } else { 86             drawHorizontal(c, parent); 87         } 88     } 89  90     //绘制横向 item 分割线 91     private void drawHorizontal(Canvas canvas, RecyclerView parent) { 92         final int left = parent.getPaddingLeft(); 93         final int right = parent.getMeasuredWidth() - parent.getPaddingRight(); 94         final int childSize = parent.getChildCount(); 95         for (int i = 0; i < childSize; i++) { 96             final View child = parent.getChildAt(i); 97             RecyclerView.LayoutParams layoutParams = (RecyclerView.LayoutParams) child.getLayoutParams(); 98             final int top = child.getBottom() + layoutParams.bottomMargin; 99             final int bottom = top + mDividerHeight;100             if (mDivider != null) {101                 mDivider.setBounds(left, top, right, bottom);102                 mDivider.draw(canvas);103             }104             if (mPaint != null) {105                 canvas.drawRect(left, top, right, bottom, mPaint);106             }107         }108     }109 110     //绘制纵向 item 分割线111     private void drawVertical(Canvas canvas, RecyclerView parent) {112         final int top = parent.getPaddingTop();113         final int bottom = parent.getMeasuredHeight() - parent.getPaddingBottom();114         final int childSize = parent.getChildCount();115         for (int i = 0; i < childSize; i++) {116             final View child = parent.getChildAt(i);117             RecyclerView.LayoutParams layoutParams = (RecyclerView.LayoutParams) child.getLayoutParams();118             final int left = child.getRight() + layoutParams.rightMargin;119             final int right = left + mDividerHeight;120             if (mDivider != null) {121                 mDivider.setBounds(left, top, right, bottom);122                 mDivider.draw(canvas);123             }124             if (mPaint != null) {125                 canvas.drawRect(left, top, right, bottom, mPaint);126             }127         }128     }129 130 }

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