是否有可能从activitiy的onCreate访问片段的UI元素 [英] Is it possible to access fragment's UI elements from activitiy's onCreate

问题描述

作为标题说：是否有可能获得与该活动的onCreate（）方法中初始化所有UI元素当前可见的片段？
我采取分离成模型，视图和控制器与处理业务逻辑和UI事件独立的控制器类。因此，他们需要将当前片段的引用。这些控制器在活动的onCreate（）方法初始化因此我需要该方法中的初始化片段

As the headline says: Is it possible to get the currently visible fragment with all UI elements initialized within the onCreate() method of the activity? I am implementing a separation into model, view and controller with separate controller classes that handle business logic and UI events. Therefore they need a reference to the current fragment. These controllers are initialized in the onCreate() method of the activity hence I need the initialized fragment within that method.

我欢迎任何样的建议：）

I welcome any kind of advice :)

编辑：

添加了一些code为了更好的理解：
我用匕首依赖注入，想做到这一点在onCreate（）方法。正如我以前说过我的控制器需要一个的MapView元素。这就是为什么我想有初始化的MapView元素的片段。

Adding some code for better understanding: I'm using dagger for dependency injection and would like to do this in the onCreate() method. As I said before my controller needs an the mapView element. And that is why I would like to have a fragment with the mapView element initialized.

MapActivity＃的onCreate（捆绑）：

MapActivity#onCreate(Bundle):

public void onCreate(Bundle savedInstance) {
    super.onCreate(savedInstance);
    setContentView(R.layout.activity_layout);

    MyMapFragment fragment = new MyMapFragment();
    getFragmentManager().beginTransaction()
        .add(R.id.activity_container, fragment, "fragment")
        .commit();

    ObjectGraph.create(new Module(fragment.getMapView())).inject(this);
}    

activity_layout.xml

activity_layout.xml

<android.support.v4.widget.DrawerLayout>
    <FrameLayout
        android:id="@+id/activity_container"
        ... />
    <ListView .../>
</android.support.v4.widget.DrawerLayout>

fragment_layout.xml

fragment_layout.xml

<RelativeLayout>
    <org.osmdroid.map.MapView 
        android:id"@+id/mapview"
        ... />
    <Button .../>
</RelativeLayout>

2ND编辑：
因此，它似乎是不可能的......耶为downvote ^^

2ND So it seems like that is not possible... Yay for the downvote ^^

推荐答案

默认情况下，没有。在的onCreate（）运行时间的活动，该片段没有连接到活动呢。

By default, no. At the time activity onCreate() runs, the fragment is not attached to the activity yet.

访问片段的观点正确的地方是在片段本身。考虑将控制器分配在其生命周期内的片段，如 onCreateView（）或 onViewCreated（）。

Right place to access a fragment's views is in the fragment itself. Consider putting the controller assignments in the fragment within its lifecycle such as onCreateView() or onViewCreated().

有可能显式运行使用排队片段​​交易<一个href=\"http://developer.android.com/reference/android/app/FragmentManager.html#executePendingTransactions%28%29\"相对=nofollow> executePendingTransactions（） ，或隐式后 super.onStart（）已在活动的生命周期中运行。之后该片段视图在活动视图层次访问。

It is possible to explicitly run queued up fragment transactions using executePendingTransactions(), or implicitly after super.onStart() has been run in the activity lifecycle. After that the fragment views are accessible in the activity view hierarchy.

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