如何最有效地从一个片段传达一个信息给其父（相当于的onActivityResult） [英] How best to convey a message from one Fragment to its parent (onActivityResult equivalent)

问题描述

OK我知道，我可能会考虑这种错误的方式，但...

OK I know that I may be thinking about this the wrong way but ...

A）我有活动的装载片段F1，它加载片段F2。 F2执行应该导致其被关闭，然后F1基于它是如何关闭执行某项操作的操作。

A) I have activity A loading Fragment F1 which loads fragment F2. F2 performs an action which should result in it being closed and then F1 performing a certain action based on how it was closed.

B）现在，因为我还配套一​​个窗格，非片段，F1版还通过startActivityForResult调用加载F2间接的影响。这意味着，当F2的包装活动结束F1临危一个电话的onActivityResult与F1可以做它需要做的。

B) Now because I'm also supporting a single pane, non-fragment, version F1 also loads F2 indirectly via a startActivityForResult call. This means that when F2's wrapper activity is finished F1 recieves an onActivityResult call and F1 can do what it needs to do.

不过，我挣扎，看落实我想要的（A）的最佳方式。我已经F2回拨活性的弹出它关闭堆栈。如果我当时在看传递一个消息，F1做它需要做的？或者（我想F1可以负责弹出F2从堆栈中）。

However, I'm struggling to see the best way to implement what I want for (A). I have F2 calling back to activity A to pop it off of the stack. Should I then be looking at passing a message to F1 to do what it needs to do? Alternatively (I suppose F1 could be responsible for popping F2 off of the stack).

我不知道是我是否在正确的轨道上与问候的消息传递回来，就通过父活动或有被关闭的F1回应F2执行的东西，它需要一个更直接的方式与F1做它需要做的。

What I'm wondering is whether I'm on the right track with regards passing messages back and forwards via the parent activity or is there a more direct way of F1 responding to F2 performing something that requires it to be closed and F1 do what it needs to do.

在此先感谢。彼得。

推荐答案

如果您的片段是紧密联系在一起的，只是不单独活动的运行。对于单窗格情况下，你可以只是一个活动中切换片段。

If your fragments are closely tied together, just don't run them in separate activities. For the single pane case you can just switch fragments within one activity.

否则，如果你想将它们活动之间分开，你需要使用的onActivityResult（）型号为传播结果返回，并在双窗格中案通过只具有第一片段的第二个呼叫的onActivityResult（）模仿吧。需要注意的是 Fragment.setTargetFragment（）包括请求code参数，以方便这一点。

Otherwise, if you do want to separate them between activities, you need to use the onActivityResult() model for propagating results back, and in the dual-pane case "emulate" it by just having the second call onActivityResult() of the first fragment. Note that Fragment.setTargetFragment() includes a request code argument to facilitate this.

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