android - getSupportFragmentManager()和getChildFragmentManager()有什么区别？

我的课继承了Fragment，这就是为什么它不能使用getSupportFragmentManager()的原因。
我正在使用getChildFragmentManager，它向我显示错误-IllegalArguementException:找不到ID的 View ...错误。

任何指导将不胜感激。

调用AttachmentsListFragment的代码是

Bundle b = new Bundle();
b.putSerializable("AttachmentsList", msg.attachments);
        AttachmentListFragment listfrag = new AttachmentListFragment(msg.attachments);
FragmentTransaction transaction = getFragmentManager().beginTransaction();
transaction.add(R.id.attachmentslistcontainer, listfrag);
transaction.addToBackStack(null);
transaction.commit();

attachmentslayout.xml是

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:id="@+id/attachmentslistcontainer"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/textViewAttachmentHeader"
        style="@style/Normal.Header.Toolbar"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="@color/list_separator_background"
        android:ellipsize="end"
        android:gravity="center"
        android:maxLines="2"
        android:text="@string/attachments_header"
        android:textColor="#FFFFFFFF"
        android:textSize="22sp"
        android:textStyle="bold"
        android:visibility="visible" />

    <ListView
        android:id="@android:id/list"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" >
    </ListView>

</FrameLayout>

AttachmentsListFragment.java

public class AttachmentListFragment extends ListFragment implements IAttachmentsData {

    ArrayList<Attachments> items = null;
    Integer cellLayoutID;
    Integer index;

    public AttachmentListFragment() {

    }

    public AttachmentListFragment(ArrayList<Attachments> items) {
        this.items = items;
        Log.i("Logging", "Items size" + items.size()); //$NON-NLS-1$
    }


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Bundle bundle;
        if (savedInstanceState != null) {
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        //super.onCreateView(inflater, container, savedInstanceState);

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


    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        setListAdapter(new AttachmentAdapter(
                getActivity().getApplicationContext(),
                R.layout.attachmentslistcellcontent,
                items));
    }

    @Override
    public void onListItemClick(ListView l, View v, int position, long id) {
        // TODO Auto-generated method stub
        super.onListItemClick(l, v, position, id);
        index = position;
        Intent intent = new Intent();
        Bundle b = new Bundle();
        b.putByteArray("Data", items.get(position).getImageData());
        intent.putExtras(b);
    }


    public byte[] getData() {
        // TODO Auto-generated method stub
        if (items != null && index < items.size()) {

            return items.get(index).getImageData();
        }
            return null;
    }

}

最佳答案

getChildFragmentManager()的定义是:



同时getFragmentManager()(或在这种情况下为getSupportFragmentManager())的定义是:



基本上，区别在于Fragment现在具有自己的内部FragmentManager，可以处理Fragments。子FragmentManager是仅处理添加到其中的Fragment中包含的Fragment的子控件。另一个FragmentManager包含在整个Activity中。

在这种情况下，我猜测是您已将Fragments添加到Activity的FragmentManager。您将获得不包含您要查找的子项FragmentManager。因此，您会得到一个异常，因为它在另一个FragmentManager中找不到具有给定ID的Fragment。