Question

我在网站上关注了类似的问题，但没有人解决我的问题。我只是得到一行我的listview应该在片段中。我已经在添加片段之前在Activity中创建了适配器。请帮忙。

public class Frag1 extends Fragment
{
    ListView listView;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) 
    {
         View view=inflater.inflate(R.layout.fragment, container, false);
         listView = (ListView) view.findViewById(R.id.list_view);
         return view;


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




        listView.setAdapter(FragActivity.adapter);
    }
}

活动的onCreate（）方法

@Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_fragment);
        adapter = new CustomAdapter(this, R.layout.List_viewit, arr);
        if (savedInstanceState == null)
        {

            getFragmentManager()
                    .beginTransaction()
                    .add(R.id.container, new Frag1())
                    .commit();
        }
  }

适配器是CustomAdapter类扩展ArrayAdapter。列表视图在活动时显示数据，但在我尝试在片段中实现时不显示。数组arr非零。

Answer 1

你能做到吗？

你的FragmentActivity

BaseAdapter mAdapter;
public BaseAdapter getmAdapter() {
    return mAdapter;
}

你的片段类

YourFragmentActivity mActivity;
public void onAttach(Activity activity) {
    super.onAttach(activity);
    try {
        mActivity = ((YourFragmentActivity) activity);
    } catch (ClassCastException ex) {
        ex.printStackTrace();
    }
}

@Override
public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    listView.setAdapter(mActivity.getmAdapter());
}

Answer 2

请勿拨打listView.setAdapter(FragActivity.adapter); 在OnActivityCreate()方法中。在onCreatview或每当片段对使用可见时调用。

Answer 3

将FragActivity类中的适配器声明为static。像这样的东西

public static CustomAdapter adapter;

Fragment中的Data ListView未显示

3 个答案: