欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  技术分享

RecyclerView如何消除底部的分割线

程序员文章站 2021-11-28 11:21:08
...

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、用到的是下面的代码

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、大功告成