片段间通信是否适用于嵌套片段? [英] Inter-fragment communication applied to Nested Fragments?

问题描述

Android开发者网站上有很棒的文章之间进行通信的接口:

The Android developers site has a great article on how to use interfaces to communicate between:

1. 一个 Fragment 及其托管的 Activity
2. 由同一 Activity
托管的两个 Fragment

我正在努力将此概念应用于嵌套片段.特别是， getActivity()或 Fragment#onAttach(Activity)会告诉您什么 Activity 承载了 Fragment .

I am struggling to apply this concept to nested fragments. In particular, getActivity() or Fragment#onAttach(Activity) tell you what Activity is hosting a Fragment.

在嵌套片段的情况下等效的是什么?子" Fragment 如何知道其包含在父" Fragment 中?而且，在不知道这一点的情况下，子 Fragment 如何将事件传递到其父 Fragment ?

What is the equivalent in case of nested fragments? How does a "child" Fragment know what "parent" Fragment it is included in? And without knowing this, how can a child Fragment pass events up to its parent Fragment?

一种明显的方法是从子 Fragment 广播意图，并让父 Fragment 监听广播，但是我宁愿使用 interface 为基础的方法.

An obvious way is to broadcast intents from the child Fragment and have the parent Fragment listen for the broadcast, but I'd rather use the interface-based approach.

推荐答案

原来有一个

It turns out there is a getParentFragment() method introduced to cater to nested fragments. It is available on android.app.Fragment from API 17, but can be used on older versions using android.support.v4.app.Fragment.

我不敢相信我忽略了这个API！

I can't believe I overlooked this API!

我碰到了此要点，该过程可以弄清楚父组件(是否 Fragment 或 Activity )简单，优雅且安全！

I came across this gist that makes this process of figuring out the parent component (whether Fragment or Activity) easy, elegant and safe!

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