ListFragment充气两次 [英] ListFragment is inflated twice

问题描述

我有被夸大了ListFragment（在skeleton.xml layout_container ）的线性布局（ menufragment ）当创建的活性。然后，当用户进行点击，这样的布局被替换为另一个ListFragment（ albumsfragment ）。

I have a linear layout (layout_container in skeleton.xml) which is inflated with a ListFragment (menufragment) when the activity is created. Then, when the user performs a click, this layout is replaced with another ListFragment (albumsfragment).

问题是，当我preSS后退按钮，我回去的确给menufragment但名单是长两倍，因为它已经与相同的项目再次填满。我怎么能避免这种情况？

The problem is that when I press the back button, I go back indeed to the menufragment but the list is twice longer because it has been filled up again with the same items. How could I avoid this ?

onCreate方法，活动在

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.skeleton);

        FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction();      
        MenuFragment menufragment = new MenuFragment();  
        fragmentTransaction.add(R.id.layout_container, menufragment, "menufragment");      
        fragmentTransaction.commit();

        }

OnClick方法，活动在

  public void OnMenuClick() {

AlbumsFragment albumsfragment = new AlbumsFragment(); 
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.layout_container, albumsfragment, "albumsfragment");
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();

}

我的片段类code：

public class MenuFragment extends ListFragment{

ArrayList<MenuItem> m_parts = new ArrayList<MenuItem>();

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

            MenuAdapter m_adapter;

            m_parts.add(new MenuItem ("item1"));
            m_parts.add(new MenuItem ("item2"));
            m_parts.add(new MenuItem ("item3"));
            m_parts.add(new MenuItem ("item4"));


            m_adapter = new MenuAdapter(getActivity(), R.layout.menu_row, m_parts);
            setListAdapter(m_adapter);

所以我每次回去从AlbumFragment到MenuFragment，在MenuFragment列表中成长，如项目1，项目2，项目3，ITEM4再次加入。

So each time I go back from AlbumFragment to MenuFragment, the list in MenuFragment grows as item1,item2,item3,item4 are added once again.

我已经尝试添加检查如果（savedInstanceState == NULL）的MenuFragment的交易之前，但不会改变任何东西。

I've try to add the check if (savedInstanceState == null) before the transaction of the MenuFragment but doesn't change anything.

我应该怎么做才能让MenuFragment从后面堆栈弹出而不被这些项目再次膨胀？

What should I do to make MenuFragment be popped up from the back Stack without being inflated again with these items ?

感谢。

推荐答案

看看的的片段生命周期。 onActivityCreated（）返回到片段时，将被称为每次。尝试，相反，你的执行移至的onCreate（）并应解决您重复的问题。

Take a look at the Fragment lifecycle. onActivityCreated() will be called everytime when returning to aFragment. Try, instead, to move your implementation to onCreate() and that should fix your duplication issue.

这篇关于ListFragment充气两次的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！