Android-如何在onActivityResult()之后返回当前片段? [英] Android - How can i return the current fragment after onActivityResult()?

问题描述

我有一个活动，其中包含一些按钮和一些片段.

I have an activity that have some buttons and some fragments.

如果我单击按钮A，我将显示片段"FragA".在"FragA"中时，我可以执行一些操作，例如从图库中选择图片，选择图片后我需要留在"FragA"中.

If I click on button A, i'll show Fragment "FragA". When I'm in "FragA", I can perform some actions like choose a picture from gallery and I need to stay in "FragA" after choose picture.

但是当我选择图片时，我返回到活动"并且"FragA"被隐藏.

But when I choose picture, I return to Activity and "FragA" is hidden.

如何执行一个动作并且仍在同一片段中或在活动"中显示正确的片段?

How can perform an action and still in same Fragment or display correct fragment in Activity?

推荐答案

您可以重新创建片段，并使用以下代码的修改将其替换为活动"中的片段:

You can recreate fragment again and replace it in your Activity with using modification of this code:

if (currentState == STATE_MAIN_FRAGMENT) {
        return;
}
mainScreenFragment = (MainScreenFragment) getSupportFragmentManager().findFragmentByTag(MainScreenFragment.TAG);
if (mainScreenFragment == null) {
    mainScreenFragment = new MainScreenFragment();
}
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.flFragmentContainer, mainScreenFragment, MainScreenFragment.TAG);
fragmentTransaction.commit();

第一个"if"检查是否设置了片段.这不是必需的，但这是一个好习惯.它可以防止您在不需要时替换片段.

First "if" checks if the fragment is set or not. It is not required but it's a good practice. It prevents you from replacing fragment when it is not necessary.

对我来说，有一件事很奇怪.因为您说的是<<"FragA"是隐藏的>>，-这意味着它已被设置但容器不可见?然后yourFragmentContainer.setVisiblity(View.VISIBLE);在活动"结果中.

And there is one thing strange for me. Because you said <<"FragA" is hidden>> - that means it was already set but container is not visible? Then yourFragmentContainer.setVisiblity(View.VISIBLE); in on Activity result.

最后一个可以帮助您的事情是保留该片段，以使它永远不会被破坏并再次创建.一些有用的链接:

And the last thing that could help you is to retain the fragment so it won't be ever destroyed and recreated again. Some helpful links:

了解片段的setRetainInstance(boolean)

http://developer.android.com/reference/android/app/Fragment.html#setRetainInstance(boolean)

或者您也可以只复制粘贴Button的OnClickListener中的内容，使其也发生在onActivityResult上.

Or you can just copy-paste what is in your Button's OnClickListener so it happens onActivityResult too.

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