问非常简单的代码，但在使用片段时出现了错误“活动已被破坏”。

EN

public class MyActivity extends FragmentActivity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
          FragmentManager fragMgr = getSupportFragmentManager();

          FirstFragment list = new FirstFragment();
          fragMgr.beginTransaction().add(android.R.id.content, list).commit();
    }

}

public class FirstFragment extends ListFragment{

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        inflater.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
        View view = inflater.inflate(R.layout.main, null);
        return view;
    }


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

        String listContent[] = {"Larry", "Moe", "Curly"}; 
        setListAdapter(new ArrayAdapter<String>(getActivity(), R.layout.list_item, listContent));
    }
   ...
}

 java.lang.IllegalStateException: Activity has been destroyed
E/AndroidRuntime(  947):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496)
E/AndroidRuntime(  947):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512)
E/AndroidRuntime(  947):    at android.app.ActivityThread.access$2200(ActivityThread.java:119)
E/AndroidRuntime(  947):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863)
E/AndroidRuntime(  947):    at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime(  947):    at android.os.Looper.loop(Looper.java:123)
E/AndroidRuntime(  947):    at android.app.ActivityThread.main(ActivityThread.java:4363)
E/AndroidRuntime(  947):    at java.lang.reflect.Method.invokeNative(Native Method)
...

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

  <Button
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="next" />

  <ListView
    android:id="@android:id/list"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#00FF00"
    android:layout_weight="1"
    android:drawSelectorOnTop="false" />

  <TextView
    android:id="@android:id/empty"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#FF0000"
    android:text="No data" />
</LinearLayout>