最近遇到一个问题，用RecyclerView显示数据，纵向列表显示，添加默认分割线。

问题是：底部也会显示分割线，这很影响美观。

怎么解决这个问题呢？我想了很多办法，毫无头绪。。。

最后，查看默认分割线的类DividerItemDecoration的源码：

public class DividerItemDecoration extends ItemDecoration { private static final int[] ATTRS = new int[]{16843284}; public static final int HORIZONTAL_LIST = 0; public static final int VERTICAL_LIST = 1; private Drawable mDivider; private int mOrientation; public DividerItemDecoration(Context context, int orientation) { TypedArray a = context.obtainStyledAttributes(ATTRS); this.mDivider = a.getDrawable(0); a.recycle(); this.setOrientation(orientation); } public void setOrientation(int orientation) { if(orientation != 0 && orientation != 1) { throw new IllegalArgumentException("invalid orientation"); } else { this.mOrientation = orientation; } } public void onDraw(Canvas c, RecyclerView parent) { if(this.mOrientation == 1) { this.drawVertical(c, parent); } else { this.drawHorizontal(c, parent); } } public void drawVertical(Canvas c, RecyclerView parent) { 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); LayoutParams params = (LayoutParams)child.getLayoutParams(); int top = child.getBottom() + params.bottomMargin; int bottom = top + this.mDivider.getIntrinsicHeight(); this.mDivider.setBounds(left, top, right, bottom); this.mDivider.draw(c); } } public void drawHorizontal(Canvas c, RecyclerView parent) { int top = parent.getPaddingTop(); int bottom = parent.getHeight() - parent.getPaddingBottom(); int childCount = parent.getChildCount(); for(int i = 0; i < childCount; ++i) { View child = parent.getChildAt(i); LayoutParams params = (LayoutParams)child.getLayoutParams(); int left = child.getRight() + params.rightMargin; int right = left + this.mDivider.getIntrinsicHeight(); this.mDivider.setBounds(left, top, right, bottom); this.mDivider.draw(c); } } public void getItemOffsets(Rect outRect, int itemPosition, RecyclerView parent) { if(this.mOrientation == 1) { outRect.set(0, 0, 0, this.mDivider.getIntrinsicHeight()); } else { outRect.set(0, 0, this.mDivider.getIntrinsicWidth(), 0); } } }

因为我用到的是垂直列表，用到的是红色字体处的代码：

public void drawVertical(Canvas c, RecyclerView parent) { 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); LayoutParams params = (LayoutParams)child.getLayoutParams(); int top = child.getBottom() + params.bottomMargin; int bottom = top + this.mDivider.getIntrinsicHeight(); this.mDivider.setBounds(left, top, right, bottom); this.mDivider.draw(c); } }

从代码中很容易看出只要修改for循环中的内容就可去掉底部的分割线：

public void drawVertical(Canvas c, RecyclerView parent) { int left = parent.getPaddingLeft(); int right = parent.getWidth() - parent.getPaddingRight(); int childCount = parent.getChildCount(); for(int i = 0; i < childCount-1; ++i) { View child = parent.getChildAt(i); LayoutParams params = (LayoutParams)child.getLayoutParams(); int top = child.getBottom() + params.bottomMargin; int bottom = top + this.mDivider.getIntrinsicHeight(); this.mDivider.setBounds(left, top, right, bottom); this.mDivider.draw(c); } }

因为这个类我们不能直接修改，所以我们可以自定义一个类，修改相应内容，

添加分割线的时候，使用自定义类。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持查字典教程网。

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