LinearLayoutManager中如何设置分隔线

在LinearLayoutManager中设置分隔线可以通过ItemDecoration来实现。首先，你需要创建一个自定义的ItemDecoration类，并重写它的onDraw方法来绘制分隔线。以下是一个示例代码：

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

    public DividerItemDecoration(Context context) {
        mDivider = ContextCompat.getDrawable(context, R.drawable.divider);
    }

    @Override
    public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
        int left = parent.getPaddingLeft();
        int right = parent.getWidth() - parent.getPaddingRight();

        for (int i = 0; i < parent.getChildCount() - 1; i++) {
            View child = parent.getChildAt(i);
            RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();

            int top = child.getBottom() + params.bottomMargin;
            int bottom = top + mDivider.getIntrinsicHeight();

            mDivider.setBounds(left, top, right, bottom);
            mDivider.draw(c);
        }
    }
}

然后，在你的RecyclerView中设置这个ItemDecoration：

DividerItemDecoration dividerItemDecoration = new DividerItemDecoration(recyclerView.getContext());
recyclerView.addItemDecoration(dividerItemDecoration);

这样就可以在LinearLayoutManager中设置分隔线了。你也可以根据需求自定义分隔线的样式和颜色。