Java 片段的onCreateView方法是什么样子的： public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { return null; }

TitlesFragment

扩展了

ListFragment

，默认情况下，该布局包含

ListView

项的布局，以及

TextView

列表为空时标签的布局和

ProgressBar

。在这种情况下，用户不必返回自己的视图，可以返回通过超级调用获得的对象<代码>列表片段的onCreateView：

public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    return inflater.inflate(com.android.internal.R.layout.list_content,
            container, false);
}

---

. 查看源代码Raghunandan，你知道android如何知道它必须将标题片段膨胀到main.xml中吗？在Quote片段的代码中，我们有mDetailsFragment=（QuotesFragment）getFragmentManager（）。标题片段没有类似的代码。我猜main activity.xml是通过class=“course.examples.Fragments.StaticLayout.TitlesFragment”来引用它的，因此它会膨胀，但我不确定…是的，请问一个新问题，我会回答谢谢你的解释，这很有意义@Simon事实上，您可以删除ListFragments中的

onCreateView

，谢谢您的解释，这很有意义@Simon事实上，您可以在

ListFragment

中去掉

onCreateView

，它无论如何都不会影响代码HMMM。。。你说得对，拉古南丹！我刚刚在AVD上测试了它，它对应用程序没有影响。我想知道为什么课程协调员会把它写进代码里。。。也许是为了向我们展示fragment类的生命周期，同时也让新手们感到困惑。

package course.examples.Fragments.StaticLayout;

import android.app.Activity;
import android.app.ListFragment;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class TitlesFragment extends ListFragment {
    private ListSelectionListener mListener = null;
    private static final String TAG = "TitlesFragment";

    public interface ListSelectionListener {
        public void onListSelection(int index);     
    }

    @Override
    public void onListItemClick(ListView l, View v, int pos, long id) {
        getListView().setItemChecked(pos, true);
        mListener.onListSelection(pos);
    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        try {
            mListener = (ListSelectionListener) activity;
        } catch (ClassCastException e) {
            throw new ClassCastException(activity.toString()
                    + " must implement OnArticleSelectedListener");
        }
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        Log.i(TAG, getClass().getSimpleName() + ":entered onCreate()");
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        Log.i(TAG, getClass().getSimpleName() + ":entered onCreate()");

        **return super.onCreateView(inflater, container, savedInstanceState);**

    }

    @Override
    public void onActivityCreated(Bundle savedState) {
        super.onActivityCreated(savedState);

        getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE);
        setListAdapter(new ArrayAdapter<String>(getActivity(),
                R.layout.title_item, QuoteViewerActivity.mTitleArray));
    }

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

    <fragment
        android:id="@+id/titles"
        android:layout_width="0px"
        android:layout_height="match_parent"
        android:layout_weight="1"
        class="course.examples.Fragments.StaticLayout.TitlesFragment" />

    <fragment
        android:id="@+id/details"
        android:layout_width="0px"
        android:layout_height="match_parent"
        android:layout_weight="2"
        class="course.examples.Fragments.StaticLayout.QuotesFragment" />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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/quoteView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:padding="5dip"
        android:textSize="32sp" >
    </TextView>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="?android:attr/activatedBackgroundIndicator"
    android:orientation="vertical"
    android:padding="5dip"
    android:textSize="32sp" >

</TextView>

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

return super.onCreateView(inflater, container, savedInstanceState);

189
190    @Override
191    public View onCreateView(LayoutInflater inflater, ViewGroup container,
192            Bundle savedInstanceState) {
193        return inflater.inflate(com.android.internal.R.layout.list_content,
194                container, false);
195    }

public class QuotesFragment extends Fragment {

return inflater.inflate(R.layout.quote_fragment, container, false);

public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
    return null;
}

public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    return inflater.inflate(com.android.internal.R.layout.list_content,
            container, false);
}