Android RecyclerView addItemDecoration不会在RecyclerView的底部添加装饰 [英] Android RecyclerView addItemDecoration Won't Add Decoration to Bottom of RecyclerView

问题描述

我无法在线上找到该问题的答案，因此答案必须如此简单，以至于没人愿意问这个问题，而我根本不知道.

I cannot find an answer to this question anywhere online, so the answer must be so simple that no one cared to ask it, and I simply don't know it.

基本上，我想在我的recyclerView中的每个项目之间以及RecyclerView的底部之间添加一条水平线.我找到了一种在RecyclerView中的每个项目之间放置分隔符 的方法，但在 end 处没有分隔符.

Essentially, I want to add a horizontal line between every item in my recyclerView AND to the bottom of the RecyclerView. I have found a way to place a divider between every item in the RecyclerView, but not one at the end.

根据文档(可在此处找到:

According to the documentation (found here: https://developer.android.com/reference/android/support/v7/widget/RecyclerView.html#addItemDecoration(android.support.v7.widget.RecyclerView.ItemDecoration, int) )

将负整数放入addItemDecoration(RecyclerView.ItemDecoration装饰， int索引).应该解决此问题，并指出:

putting a negative int into the addItemDecoration(RecyclerView.ItemDecoration decor, int index). should solve this problem, stating:

如果该值为负，则装饰将在末尾添加.

If this value is negative the decoration will be added at the end.

这是我的自定义RecyclerView的构造方法:

This is the constructor method for my custom RecyclerView:

public CustomRecyclerView(Context context, @Nullable AttributeSet attrs) {
    super(context, attrs);
    setHasFixedSize(true);
    setLayoutManager(new LinearLayoutManager(context));
    decor = new HorizontalDividerItemDecoration.Builder(context).build();
    addItemDecoration(decor, -1);
}

如您所见，我在addItemDecoration()中使用了一个负整数，但我无法弄清为什么它不能按预期的方式工作.

As you can see, I am using a negative integer in addItemDecoration(), and I cannot figure out why it is not working the way it is supposed to.

任何帮助将不胜感激！

推荐答案

根据Janice Kartika的建议，我将代码复制并粘贴到了我的项目中.复制并粘贴Janice的代码后，Android Studio给了我这个建议:

As per Janice Kartika's suggestion, I copied and pasted the code into my project. After I copied and pasted Janice's code, Android Studio gave me this suggestion:

用android.support.v7.widge.DividerItemDecoration替换吗?

RycyclerView库的较旧版本不包含分隔符装饰器，但在支持演示中提供了一个分隔器装饰器作为示例.该分隔器类已被广泛复制/粘贴到各种项目中.

在最新版本的支持库中，现在包括了分隔符装饰器，因此您可以将自定义副本替换为内置"版本android.support.v7.widget.DividerItemDecoration

这样，而不是使用Horizo​​ntalDividerItemDecoration(它是我们已导入的外部库的一部分)，如下所示:

So instead of using HorizontalDividerItemDecoration (which was part of an external library that we had imported) like this:

decor = new HorizontalDividerItemDecoration.Builder(context).build();
addItemDecoration(decor, -1);

我这样使用默认的"DividerItemDecoration":

I used the default "DividerItemDecoration" like this:

decor = new DividerItemDecoration(context, DividerItemDecoration.VERTICAL);
addItemDecoration(decor);

，它奏效了.原来，如果您不将"int索引"放入addItemDecoration中，则默认设置为-1，并且默认情况下将装饰添加到底部.

and it worked. Turns out if you do not put and "int index" into addItemDecoration, it will default to -1 and add the decoration to the bottom by default.

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