去除RecyclerView底部（最后一条）分割线

做了一个横向滑动的RecyclerView 使用自定义分割线 宽度为10dp

因为左右都有padding值 最后一条如果有分割线太丑 也不符合需求 

解决 网上参考了一些方法 大多都是继承 ItemDecoration 重写其方法 然后在循环创建分割线的循环里减一

但是

我发现不管用 分割线还在那 似乎是因为宽度太宽引起的？

那就继续修改，在给分割线高度赋值的时候 判断如果是最后一条 把分割线的宽高都赋值为0 其他的正常赋值

我这里是横向滑动的RecyclerView 如果是纵向的 一样的方法

下面附上完整的代码

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.v7.widget.RecyclerView;
import android.support.v7.widget.RecyclerView.ItemDecoration;
import android.support.v7.widget.RecyclerView.State;
import android.util.Log;
import android.view.View;

/**
 * Created by qzp on 2019/6/13. 去除recyclerView最后一条分割线
 */

public class MyItemDecoration extends ItemDecoration {
    public static final int HORIZONTAL = 0;
    public static final int VERTICAL = 1;
    private static final String TAG = "DividerItem";
    private static final int[] ATTRS = new int[]{16843284};
    private Drawable mDivider;
    private int mOrientation;
    private final Rect mBounds = new Rect();

    public MyItemDecoration(Context context, int orientation) {
        TypedArray a = context.obtainStyledAttributes(ATTRS);
        this.mDivider = a.getDrawable(0);
        if (this.mDivider == null) {
            Log.w("DividerItem", "@android:attr/listDivider was not set in the theme used for this DividerItemDecoration. Please set that attribute all call setDrawable()");
        }

        a.recycle();
        this.setOrientation(orientation);
    }

    public void setOrientation(int orientation) {
        if (orientation != 0 && orientation != 1) {
            throw new IllegalArgumentException("Invalid orientation. It should be either HORIZONTAL or VERTICAL");
        } else {
            this.mOrientation = orientation;
        }
    }

    public void setDrawable(@NonNull Drawable drawable) {
        if (drawable == null) {
            throw new IllegalArgumentException("Drawable cannot be null.");
        } else {
            this.mDivider = drawable;
        }
    }

    @Override
    public void onDraw(Canvas c, RecyclerView parent, State state) {
        if (parent.getLayoutManager() != null && this.mDivider != null) {
            if (this.mOrientation == 1) {
                this.drawVertical(c, parent);
            } else {
                this.drawHorizontal(c, parent);
            }

        }
    }

    private void drawVertical(Canvas canvas, RecyclerView parent) {
        canvas.save();
        int left;
        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();
        }

        int childCount = parent.getChildCount();

        //当最后一个子项的时候去除下划线
        for (int i = 0; i < childCount - 1; ++i) {
            View child = parent.getChildAt(i);
            parent.getDecoratedBoundsWithMargins(child, this.mBounds);
            int bottom = this.mBounds.bottom + Math.round(child.getTranslationY());
            int top = bottom - this.mDivider.getIntrinsicHeight();
            this.mDivider.setBounds(left, top, right, bottom);
            this.mDivider.draw(canvas);
        }

        canvas.restore();
    }

    private void drawHorizontal(Canvas canvas, RecyclerView parent) {
        canvas.save();
        int top;
        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();
        }

        int childCount = parent.getChildCount();

        for (int i = 0; i < childCount - 1; ++i) {
            View child = parent.getChildAt(i);
            parent.getLayoutManager().getDecoratedBoundsWithMargins(child, this.mBounds);
            int right = this.mBounds.right + Math.round(child.getTranslationX());
            int left = right - this.mDivider.getIntrinsicWidth();
            this.mDivider.setBounds(left, top, right, bottom);
            this.mDivider.draw(canvas);
        }

        canvas.restore();
    }

    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, State state) {
        if (this.mDivider == null) {
            outRect.set(0, 0, 0, 0);
        } else {
            if (this.mOrientation == 1) {
                //纵向RecyclerView
                outRect.set(0, 0, 0, this.mDivider.getIntrinsicHeight());
            } else {
                //横向RecyclerView
                int childAdapterPosition = parent.getChildAdapterPosition(view);
                int lastCount = parent.getAdapter().getItemCount() - 1;
                //如果不是最后一条 正常赋值 如果是最后一条 赋值为0
                if (childAdapterPosition != lastCount){
                    outRect.set(0, 0, this.mDivider.getIntrinsicWidth(), 0);
                } else {
                    outRect.set(0, 0, 0, 0);
                }

            }

        }
    }
}

引用

MyItemDecoration dividerItemDecoration = new MyItemDecoration(mContext, DividerItemDecoration.HORIZONTAL);
        dividerItemDecoration.setDrawable(getResources().getDrawable(R.drawable.home_recycler_divider));
        recyclerViewHor.addItemDecoration(dividerItemDecoration);

关于这个自定义的分割线也附上