在片段和活动之间进行交流-最佳做法 [英] Communicating between a fragment and an activity - best practices

问题描述

这个问题主要是为了征询关于处理我的应用程序的最佳方法的意见.我有一个活动正在处理三个片段.片段A有一个可单击元素(照片)，片段B有4个可单击元素(按钮).单击照片后，另一个片段仅显示详细信息.我正在使用ActionBarSherlock.

This question is mostly to solicit opinions on the best way to handle my app. I have three fragments being handled by one activity. Fragment A has one clickable element the photo and Fragment B has 4 clickable elements the buttons. The other fragment just displays details when the photo is clicked. I am using ActionBarSherlock.

前进和后退按钮需要将照片分别更改为下一个或上一个姿势.我可以将照片和按钮放在同一片段中，但想让它们分开，以防我想在平板电脑中重新排列它们.

The forward and back buttons need to change the photo to the next or previous poses, respectively. I could keep the photo and the buttons in the same fragment, but wanted to keep them separate in case I wanted to rearrange them in a tablet.

我需要一些建议-我应该结合片段A和片段B吗?如果没有，我将需要弄清楚如何为3个可点击项实现接口.

I need some advice - should I combine Fragments A and B? If not, I will need to figure out how to implement an interface for 3 clickable items.

我考虑过使用Roboguice，但是我已经使用SherlockFragmentActivity进行了扩展，所以这是不可行的.我看到了Otto的提法，但是我没有看到关于如何将其包含在项目中的优秀教程.您认为最佳设计实践应该是什么?

I considered using Roboguice, but I am already extending using SherlockFragmentActivity so that's a no go. I saw mention of Otto, but I didn't see good tutorials on how to include in a project. What do you think best design practice should be?

我还需要帮助弄清楚如何在片段和活动之间进行通信.我想在应用程序中保留一些全局"数据，例如pose ID.除了股票android开发人员的信息外，还有一些示例代码可以看到吗?那并不是全部有帮助.

I also need help figuring out how to communicate between a fragment and an activity. I'd like to keep some data "global" in the application, like the pose id. Is there some example code I can see besides the stock android developer's information? That is not all that helpful.

顺便说一句，我已经将有关每个姿势的所有信息存储在SQLite数据库中.那是容易的部分.

BTW, I'm already storing all the information about each pose in a SQLite database. That's the easy part.

推荐答案

在活动和片段之间进行通信的最简单方法是使用接口.这个想法基本上是在给定的片段A内定义一个接口，然后让活动实现该接口.

The easiest way to communicate between your activity and fragments is using interfaces. The idea is basically to define an interface inside a given fragment A and let the activity implement that interface.

一旦实现了该接口，您就可以在其覆盖的方法中做任何您想做的事情.

Once it has implemented that interface, you could do anything you want in the method it overrides.

接口的另一个重要部分是您必须从片段中调用abstract方法，并记住将其强制转换为活动.如果处理不正确，它将捕获ClassCastException.

The other important part of the interface is that you have to call the abstract method from your fragment and remember to cast it to your activity. It should catch a ClassCastException if not done correctly.

关于简单开发者博客的教程很好关于如何做这种事情.

There is a good tutorial on Simple Developer Blog on how to do exactly this kind of thing.

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