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RecyclerView消除底部分割线的方法

2019年07月24日  | 移动技术网移动技术  | 我要评论

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移动技术网。

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