java - ListFragment，不显示数据

Question

我试图让我的 ListFragment 显示在我的 View 中，但是我对这段代码遇到了无穷无尽的问题，无法让它显示我的解析器的结果。我相信这很可能是我的 xml 文件的问题，我的代码中没有收到任何错误，它只是不显示 ListView。

activity_main.xml

}

    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >


    <ListView
        android:id="@+id/list"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:paddingBottom="@dimen/activity_vertical_margin"
        android:paddingLeft="@dimen/activity_horizontal_margin"
        android:paddingRight="@dimen/activity_horizontal_margin"
        android:paddingTop="@dimen/activity_vertical_margin"
        class="com.example.CourseList">

    </ListView>
</RelativeLayout>

list_layout.xml

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

    <TextView
        android:id="@+id/course"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="16dp"
        android:text="TextView"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:textSize="36sp" />

    <TextView
        android:id="@+id/room"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/course"
        android:layout_alignBottom="@+id/course"
        android:layout_marginLeft="16dp"
        android:layout_toRightOf="@+id/course"
        android:text="TextView"
        android:textAppearance="?android:attr/textAppearanceSmall" />

    <TextView
        android:id="@+id/building"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/room"
        android:layout_alignBottom="@+id/room"
        android:layout_toRightOf="@+id/room"
        android:text="TextView"
        android:textAppearance="?android:attr/textAppearanceSmall" />

</RelativeLayout>

Answer 1

我相信您需要调用onViewCreated。尝试更改这行代码:

     @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        int num = getArguments().getInt(ARG_SECTION_NUMBER);
        records = dao.getAllRecords();
        mAdapter = new TimetableAdapter(getActivity(), android.R.id.list, records);
        listView.setAdapter(mAdapter);
    }

对此:

   @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        int num = getArguments().getInt(ARG_SECTION_NUMBER);
        records = dao.getAllRecords();
        mAdapter = new TimetableAdapter(getActivity(), android.R.id.list, records);
        listView.setAdapter(mAdapter);
    }