使用片段xml文件中的视图 [英] Use view from fragment xml file

问题描述

我有一个带有多个标签的活动(使用固定标签+滑动"样式).每个选项卡的布局都定义为片段xml文件.

I have an activity with several tabs (using the 'fixed tabs + swipe' style). Each tab layout is defined as a fragment xml file.

例如，我的活动称为 ModifyCustActivity .这将使用一个几乎为空的xml文件，称为 activity_modify_cust.xml .此页面上的每个标签都由各种xml文件表示，例如 fragment_modify_cust_basic 和 fragment_modify_cust_address 等.这些片段xml文件每个都包含 EditText Spinner s以及更多.

Eg, my activity is called ModifyCustActivity. This uses an almost-empty xml file called activity_modify_cust.xml. Each tab on this page is represented by various xml files such as fragment_modify_cust_basic and fragment_modify_cust_address etc etc. Each of these fragment xml files contains EditTexts, Spinners and more.

活动开始时，我需要能够从活动代码访问这些视图，因为我需要预先填充它们，并在对其进行编辑后获得其结果.但是，由于这些视图存在于片段xml文件中，因此我似乎无法通过代码访问它们.有没有办法访问片段xml文件中包含的视图?

When the activity starts, I need to be able to access these views from the activity code, as I need to pre-populate them, and get their results once they are edited. However, because these views exist in a fragment xml file, I don't seem to be able to reach them in code. Is there a way to access a view contained in a fragment xml file?

推荐答案

是否可以访问片段xml文件中包含的视图?

Is there a way to access a view contained in a fragment xml file?

是的，但是您的片段应该在XML布局文件中声明，这似乎是您的情况.

Yes it is, but your fragment should be declared in the XML layout file, which seems to be your case.

例如:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              ...">

    <fragment
            android:name="com.example.MyFragment"
            android:id="@+id/my_fragment"
            android:layout_width="match_parent"
            android:layout_height="match_parent"/>

</LinearLayout>

您将像这样访问片段:

FragmentManager manager = getSupportFragmentManager();
MyFragment fragment = (MyFragment)manager.findFragmentById(R.id.my_fragment);

然后使用 fragment 实例，您可以进一步访问视图，例如，通过从片段中调用公共方法来更新某些特定视图.

Then using the fragment instance you could further access your views, for example by calling a public method from the fragment which updates some particular view.

更新:
假设您有一个 TextView 出现在片段的布局中，并且需要从活动中进行更新.

UPDATE:
Suppose you have a TextView that appears in layout of the fragment, and need to update from the activity.

让它成为片段类:

public class MyFragment extends Fragment{

    private TextView textView;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view =  inflater.inflate(R.layout.fragment_layout, null, false);
        textView = (TextView)view.findViewById(R.id.textView);
        return view;
    }

    public void updateTextView(String text){
        textView.setText(text);
    }
}

然后，您将通过在活动中调用 updateTextView()方法来更新 TextView :

Then you would update the TextView by calling in your activity the updateTextView() method:

fragment.updateTextView("text");

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