Android - getTargetFragment 和 setTargetFragment - 它们的用途是什么 [英] Android - getTargetFragment and setTargetFragment - What are they used for

问题描述

我尝试过搜索，但还是有点迷茫.我通常通过接口或 BroadcastReceiver 通过 Activity 进行片段到片段的通信.

I tried searching but i'm still a little lost. I usually do fragment to fragment communication through an Activity via interfaces or a BroadcastReceiver.

无论如何，我的问题是getTargetFragment有什么用?有人可以提供一个用例或只是一个简单的例子，以便我可以理解它的用法吗?

Anyway, my question is what is the use of getTargetFragment? Can someone provide a use case or just a quick example so i can comprehend its usage?

推荐答案

用例 = 由同一活动托管的 2 个片段.

Use case = 2 fragments hosted by the same activity.

其中 startActivityForResult() 建立了 2 个 Activity 之间的关系，setTargetFragment() 定义了 2 个片段之间的调用者/被调用者关系.

Where startActivityForResult() establishes a relationship between 2 activities, setTargetFragment() defines the caller/called relationship between 2 fragments.

setTargetFragment(target) 让被调用的"片段知道将结果发送到哪里.onActivityResult() 在这种情况下被手动调用.

setTargetFragment(target) lets the "called" fragment know where to send the result. onActivityResult() is called manually in this case.

public class Caller extends Fragment
     Fragment called = Called.newInstance()
     called.setTargetFragment(this)

public class Called extends DialogFragment
   intent = amazingData
   getTargetFragment().onActivityResult(getTargetRequestCode(), resultCode, intent)

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