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

我尝试搜索，但仍然有些失落.我通常会通过接口或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的用途是什么?有人可以提供用例还是简单示例，以便我理解其用法?

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=同一活动托管的2个片段.

Use case = 2 fragments hosted by the same activity.

startActivityForResult()在2个活动之间建立关系，而setTargetFragment()定义2个片段之间的呼叫者/被叫关系.

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.在这种情况下，会手动调用onActivityResult().

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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