RecyclerView在最后一项之后删除分隔器/装饰器 [英] RecyclerView remove divider / decorator after the last item

问题描述

我有一个非常简单的RecyclerView.
这就是我设置分隔符的方式:

I have a quite simple RecyclerView.
This is how I set the divider:

DividerItemDecoration itemDecorator = new DividerItemDecoration(getContext(), DividerItemDecoration.VERTICAL);
itemDecorator.setDrawable(ContextCompat.getDrawable(getActivity(), R.drawable.news_divider));
recyclerView.addItemDecoration(itemDecorator);

这是drawable/news_divider.xml:

<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle">
    <solid android:color="@color/white_two"/>
    <size android:height="1dp"/>
</shape>

问题是由于某种原因，分隔符不只是在项目之间创建的.而且在最后一项之后.我只希望在项目之间，而不是在每个项目之后.

The problem is for some reason the divider is not just created in between the items. But also after the last item. And I want it only in between the items not after every item.

有什么主意如何防止分隔线显示在最后一项之后?

Any idea how to prevent the divider from showing after the last item?

推荐答案

尝试使用此代码，它不会显示最后一项的分隔线.这种方法可以让您更好地控制图形分隔线.

Try this Code, it won't show divider for the last item. This method will give you more control over drawing divider.

public class DividerItemDecorator extends RecyclerView.ItemDecoration {
    private Drawable mDivider;

    public DividerItemDecorator(Drawable divider) {
        mDivider = divider;
    }

    @Override
    public void onDrawOver(Canvas canvas, RecyclerView parent, RecyclerView.State state) {
        int dividerLeft = parent.getPaddingLeft();
        int dividerRight = parent.getWidth() - parent.getPaddingRight();

        int childCount = parent.getChildCount();
        for (int i = 0; i <= childCount - 2; i++) {
            View child = parent.getChildAt(i);

            RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();

            int dividerTop = child.getBottom() + params.bottomMargin;
            int dividerBottom = dividerTop + mDivider.getIntrinsicHeight();

            mDivider.setBounds(dividerLeft, dividerTop, dividerRight, dividerBottom);
            mDivider.draw(canvas);
        }
    }
}

divider.xml:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <size
        android:width="1dp"
        android:height="1dp" />
    <solid android:color="@color/grey_300" />
</shape>

像这样设置您的分频器:

RecyclerView.ItemDecoration dividerItemDecoration = new DividerItemDecorator(ContextCompat.getDrawable(context, R.drawable.divider));
recyclerView.addItemDecoration(dividerItemDecoration);

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