什么是setArguments的地步？

问题描述

您好我一直在寻找对Android网站下面的片段的例子。

Hi I was looking at the following Fragments example on the android site.

http://developer.android.com/guide/components/fragments.html#Example

我想知道为什么某些方法进行。

I would like to know why certain methods are performed.

为什么，例如，在 detailsFragment 是以下方法进行：

Why for instance, in the detailsFragment is the following method performed:

public static DetailsFragment newInstance(int index) {
    DetailsFragment f = new DetailsFragment();

    // Supply index input as an argument.
    Bundle args = new Bundle();
    args.putInt("index", index);
    f.setArguments(args);

    return f;
}

你能不能也简单地初始化 DetailsFragment 并使用setter方法​​来设置首页代替。绕过整个 setArguments 。

Could you not also simply instantiate the DetailsFragment and use a setter method to set index instead. Bypassing the whole setArguments.

什么是摆在首位使用 setArguments 的地步？难道你不只是使用getter和setter方法​​？

What's the point of using setArguments in the first place? Could you not just use setters and getters?

推荐答案

您可以使用getter和setter方法​​，而是通过传递一个包你不需要编写code，因为它已经存在。另外，我认为，这些参数将自动传递再次，如果屏幕方向的变化，这也使生活更轻松。

You can use getters and setters, but by passing in a bundle you don't need to write that code, since it's already there. Also, I believe that these arguments are automatically passed in again if the screen orientation changes, which also makes life easier.

从本质上讲，setArguments和getArguments只是一种设计模式，谷歌建议您遵循：

Essentially, setArguments and getArguments is just a design pattern that Google suggests you follow:

每一个片段都必须有一个空的构造，所以可以  当恢复其活性的状态实例化。强烈  建议子类不具有其他构造与  参数，因为这些构造不会被调用时，  片段重新实例;相反，参数可以被供给  主叫方与setArguments（捆绑），后来被片段检索  与getArguments（）。   http://developer.android.com/reference/android/app/Fragment.html

我采取包括需要哪些为您片段操作以及制定者。话又说回来 - 没有什么强迫你做这种方式，正如你知道 - 这不是事情可以作出的唯一方法

I take that to include setters which are needed for your Fragment to operate as well. Then again - there's nothing forcing you to do it this way, and as you know - it's not the only way things could be made to work.

这篇关于什么是setArguments的地步？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！