相关疑难解决方法(0)

Android平台:3.1

我试图将一个片段从容器A移动到容器B.下面是完成此操作的代码:

private void reattach(int newContainerId, Fragment frag, String tag) {

      if (frag == null || !frag.isAdded() || (frag.getId() == newContainerId)) { return; }

      final FragmentManager fm = getFragmentManager();
      FragmentTransaction ft = fm.beginTransaction();
      ft.remove(frag);     //stacco il frammento dal container A
      ft.commit();
      fm.executePendingTransactions();

      ft = fm.beginTransaction();
      ft.add(newContainerId, frag, tag); //attacco il frammento sul container D
      ft.commit();
      fm.executePendingTransactions();   
   }

当我运行系统时,我得到以下IllegalStateException:

03-26 00:13:14.829: E/AndroidRuntime(30090): java.lang.RuntimeException: Unable to start activity ComponentInfo{eu.areamobile.apps.sfa/eu.areamobile.apps.sfa.activity.HomeActivity}: java.lang.IllegalStateException: Can't change container ID of fragment FragmentHomeController{408202a8 id=0x7f050010 HomeController}: was 2131034128 now …

我想创建一个Activity显示用户可以通过的菜单.通过单击项目,将显示一个新屏幕,允许用户提供更多选项(类似向导).

我想用Fragments 来实现它,但它对我不起作用.
现在我有:

main.xml:

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

    <fragment
        android:id="@+id/mainmenufragment"
        android:name="com.myapp.MainMenuFragment"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />

    <fragment
        android:id="@+id/secondmenufragment"
        android:name="com.myapp.SecondMenuFragment"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />

</LinearLayout>

MainMenuFragment用OnClickListener:

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.mainmenu, container, false);

    setupButton(view);
    return view;
}

/* Button setup code omitted */

@Override
public void onClick(View v) {
    SherlockFragment secondRunMenuFragment = (SherlockFragment) getSherlockActivity().getSupportFragmentManager().findFragmentById(R.id.secondmenufragment);
    FragmentTransaction transaction = getSherlockActivity().getSupportFragmentManager().beginTransaction();

    transaction.replace(android.R.id.content, secondMenuFragment); …

以下是我希望我的应用程序在平板电脑上执行的操作.Fragment(0)有一些菜单会显示片段(1)...(n),如下所示:

-----------------
|   |   |   |   |
|   |   |   |   |
|(0)| X | X | X |
|   |   |   |   |
|   |   |   |   |
-----------------
 becomes
-----------------
|   |   |   |   |
|   |   |   |   |
|(0)|(1)| X | X |
|   |   |   |   |
|   |   |   |   |
-----------------
 and then
-----------------
|   |   |   |   |
|   |   |   |   |
|(0)|(2)|(1)| X |
|   |   |   |   |
| …