ListFragment onCreateView 未调用

Question

我正在尝试使用 FragmentManager 替换片段，但由于某些原因 OnCreateView() 未被调用。

这是我用来创建片段的代码：

FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
FeedbackListFragment listFragment = new FeedbackListFragment();
fragmentTransaction.replace(R.id.feedback_placeholder, listFragment);
fragmentTransaction.commit();

这是 FeedbackListFragment 的代码：

public class FeedbackListFragment extends ListFragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        Log.d(TAG,"create feedbacklistview");
        View view = inflater.inflate(R.layout.feedback_popup, container, false);
        return view;
    }
}

这是我的主要布局：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:background="@color/background_normal"
              android:id="@+id/main_layout">

    <FrameLayout
        android:id="@+id/feedback_placeholder"
        android:layout_width="match_parent"
        android:visibility="gone"
        android:layout_height="match_parent"></FrameLayout>

    <TextView
            android:layout_width="wrap_content"
            android:layout_height="90dp"
            android:textAppearance="?android:attr/textAppearanceLarge"
            android:text="@string/overview_scan_text"
            android:id="@+id/scantagLabel"
            android:layout_gravity="center"
            android:gravity="center"
            android:textSize="42sp"
            android:textIsSelectable="false"/>
    <ImageView
            android:layout_width="match_parent"
            android:layout_height="180dp"
            android:id="@+id/cleanjack_image"
            android:src="@drawable/logo_clean_jack"
            android:layout_gravity="left|center_vertical"
            android:contentDescription="@string/app_name"/>
    <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:paddingTop="20dp"
            android:textAppearance="?android:attr/textAppearanceLarge"
            android:text=""
            android:id="@+id/messageLabel"
            android:layout_gravity="center"
            android:gravity="center"
            android:textSize="20sp"
            android:textIsSelectable="false"/>
</LinearLayout>

我已经删除了 android:visibility="gone" 以查看是否是问题所在，但它没有用。

Answer 1

来自 ListFragment 中 onCreateView 的文档：

Provide default implementation to return a simple list view. Subclasses can override to replace with their own layout. If doing so, the returned view hierarchy must have a ListView whose id is {@link android.R.id#list android.R.id.list} and can optionally have a sibling view id {@link android.R.id#empty android.R.id.empty} that is to be shown when the list is empty.
If you are overriding this method with your own custom content, consider including the standard layout {@link android.R.layout#list_content} in your layout file, so that you continue to retain all of the standard behavior of ListFragment. In particular, this is currently the only way to have the built-in indeterminant progress state be shown.

Answer 2

我试过你的示例代码

Activity :

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main_list);

    FragmentManager fragmentManager = getSupportFragmentManager();
    FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
    FeedbackListFragment listFragment = new FeedbackListFragment();
    fragmentTransaction.replace(R.id.feedback_placeholder, listFragment);
    fragmentTransaction.commit();
}

片段列表：

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

    View view = inflater.inflate(R.layout.feedback_popup, container, false);
    return view;
}

XML Activity

    <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#bcbcbc"
    android:id="@+id/main_layout">

    <FrameLayout
        android:id="@+id/feedback_placeholder"
        android:layout_width="match_parent"
        android:visibility="gone"
        android:layout_height="match_parent"></FrameLayout>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="90dp"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="overview_scan_text"
        android:id="@+id/scantagLabel"
        android:layout_gravity="center"
        android:gravity="center"
        android:textSize="42sp"
        android:textIsSelectable="false"/>
    <ImageView
        android:layout_width="match_parent"
        android:layout_height="180dp"
        android:id="@+id/cleanjack_image"
        android:src="@drawable/ic_launcher_background"
        android:layout_gravity="left|center_vertical"
        android:contentDescription="@string/app_name"/>
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:paddingTop="20dp"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text=""
        android:id="@+id/messageLabel"
        android:layout_gravity="center"
        android:gravity="center"
        android:textSize="20sp"
        android:textIsSelectable="false"/>
</LinearLayout>

Xml 片段

    <?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
    android:layout_height="match_parent">


    <ListView

        android:id="@android:id/list"
        android:layout_width="match_parent"
        android:layout_height="match_parent"></ListView>
</android.support.constraint.ConstraintLayout>

你是否设置了fragmentList的listView的id为

android:id="@android:id/list"

希望这对您有所帮助 :)

ListFragment onCreateView 未调用

ListFragment onCreateView not called

android

android-fragments

fragmentmanager