访问 API 和导航时的 Android 最佳实践
假设我有两个 Activity 要在 Android 中开发。当最终用户单击活动 A 中的按钮时，应用程序应该从 JSON API 中提取数据并将该信息呈现在活动 B 上。
所以我的问题是，最佳实践或模式是什么？即
- Activity A将调用AsyncTask并执行JSON调用。拉取数据，通过putExtra推送到Intent中，调用Activity B？
- Activity A 将调用 Activity B，Activity B onCreate 将调用 AsyncTask 并执行 JSON 调用？
- 其他建议？
哪一种是首选模式？
哪一个可以提供更好的用户体验？ （例如，想象一下如果连接到服务器失败，错误对话框将在哪里。）
Let say that I have two Activity to develop in Android. Upon the end user click a button in Activity A, the application supposed to pull data off a JSON API and present that information on Activity B.
So my question is, what's the best practice or pattern? i.e.
- Activity A will call an AsyncTask and perform JSON call. Pull the data, push it into the Intent via putExtra, and call Activity B?
- Activity A will call Activity B, Activity B onCreate will call an AsyncTask and perform the JSON call?
- Other suggestions?
Which one is the prefer pattern?
And which gives better user experience? (e.g. imagine where the error dialog will be if connection fail to the server.)
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我认为通常情况下你的#2方法已经完成了。但在大多数情况下，您需要告诉 Activity B 从 JSON API 请求什么类型的信息。假设在活动 A 中您从列表中选择一个项目，活动 B 将获得有关该项目的更多信息。在此示例中，活动 A 将简单地传递对所选项目的引用，然后活动 B 可以使用该引用发出 JSON 请求以获取有关该项目的更多信息。这有道理吗？
我通常会尝试在 Intent extras 中传递尽可能少的信息，因此我会避开您的第一个解决方案。
I think normally something of your #2 approach is done. In most cases, though, you need to tell Activity B what type of information to request from the JSON API. So say in Activity A you are choosing an item from a list, and Activity B will get more information about that item. In this example Activity A will simply pass a reference to which item was selected, and then Activity B can use that reference to make a JSON request for more information about that item. Does that make sense?
I usually try to pass as little information as I can in Intent extras so I would steer clear of your first solution.