Question

我有一个带有容器的活动，其中我显示了一个由listFragment生成的列表。现在我希望通过＆＃34;转发＆＃34;来处理列表项的点击次数。 onItemClick方法通过一个pulA接口连接到mainActivity。我做了setOnItemClickLIstener，我也尝试了很多我在这里和其他地方找到的解决方案，例如设置机器人：可聚焦=＆＃34;假＆＃34; 机器人：focusableInTouchMode =＆＃34;假＆＃34; 在我的自定义列表项的xml文件中。

片段代码看起来像这样（我不会发布整个代码以保持简单，如果需要，我将提供代码的其他部分）

public class DishListFragment extends ListFragment implements ListView.OnItemClickListener {

// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
private static final String ARG_PARAM3 = "param3";
private static final String ARG_PARAM4 = "param4";
private static final String ARG_PARAM5 = "param5";

//List of Dishes to contain the dishes we get from the server
//Todo: fill with dynamic content
private ArrayList<DishListItem> dishes;

private String mParam1;
private String mParam2;

private OnFragmentInteractionListener mListener;

private ListView mListView;
private ListAdapter mAdapter;

public static DishListFragment newInstance(Date day, boolean soup, boolean meat,
                                           boolean veggies, boolean sideDishes) {
    DishListFragment fragment = new DishListFragment();
    Bundle args = new Bundle();
    args.putString(ARG_PARAM1, String.valueOf(day));
    args.putString(ARG_PARAM2, String.valueOf(soup));
    args.putString(ARG_PARAM3, String.valueOf(meat));
    args.putString(ARG_PARAM4, String.valueOf(veggies));
    args.putString(ARG_PARAM5, String.valueOf(sideDishes));
    fragment.setArguments(args);
    return fragment;
}

public DishListFragment() { }


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

    //dummy list of dishes addad for developing purposes
    // Todo: implement dynamic server generated list content

    // create this array to test the comment function
    String[] commentDummy = new  String[]{"gut", "lecker", "schlecht"};
    dishes = new ArrayList<DishListItem>();
    dishes.add(new DishListItem("Rigatonelli", commentDummy, 2.0f ,4));
    dishes.add(new DishListItem("Spinatcremesuppe"));
    dishes.add(new DishListItem("Hackbällchen"));
    dishes.add(new DishListItem("Gemüsepfanne"));
    dishes.add(new DishListItem("Reis"));
    dishes.add(new DishListItem("Rumpsteak"));
    dishes.add(new DishListItem("Rumpsteak"));
    dishes.add(new DishListItem("Rumpsteak"));
    dishes.add(new DishListItem("Rumpsteak"));
    dishes.add(new DishListItem("Rumpsteak"));
    dishes.add(new DishListItem("Rumpsteak"));
    //end here
    // set an adapter to the list and let it display the list
    // Todo: implement custom list view elements for graphical UI
    // Todo: implement custom adapter to handle user preferences (meat/ veggies/  soups/ sidedishes)
    mAdapter = new DishListAdapter(getActivity(),dishes);
}

//create on click adapter to handle clicks on list items
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id){
    DishListItem dishItem =  this.dishes.get(position);
    Toast.makeText(getActivity(), dishItem.getDishName() +" clicked!",  Toast.LENGTH_SHORT).show();
    mListener.onDishClicked(dishes, position);
}

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

    mListView = (ListView) view.findViewById(android.R.id.list);
    mListView.addHeaderView(header);
    mListView.setAdapter(mAdapter);

    // Set OnItemClickListener so we can be notified on item clicks
    mListView.setOnItemClickListener(this);
    return view;
}

@Override
public void onAttach(Activity activity) {
    super.onAttach(activity);
    try {
        mListener = (OnFragmentInteractionListener) activity;
    } catch (ClassCastException e) {
        throw new ClassCastException(activity.toString() + " must implement OnFragmentInteractionListener");
    }
}

@Override
public void onDetach() {
    super.onDetach();
    mListener = null;
}


public void setEmptyText(CharSequence emptyText) {
    View emptyView = mListView.getEmptyView();

    if (emptyText instanceof TextView) {
        ((TextView) emptyView).setText(emptyText);
    }
}

/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated
* to the activity and potentially other fragments contained in that
* activity.
* <p>
* See the Android Training lesson <a href=
* "http://developer.android.com/training/basics/fragments/communicating.html"
* >Communicating with Other Fragments</a> for more information.
*/
public interface OnFragmentInteractionListener {
    // TODO: Update argument type and name
    public void onDishClicked(ArrayList<DishListItem> dishes, int position);
}

}

主要活动如下所示

public class CulinariumSpeiseplan extends ActionBarActivity
implements DishListFragment.OnFragmentInteractionListener

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_culinarium_speiseplan);
    //add list fragment to the activity layout (put it into the container)
    if(savedInstanceState == null){
        getFragmentManager().beginTransaction()
                .add(R.id.listDishesContainer, new DishListFragment())
                .commit();
    }
}

{
    @Override
public void onDishClicked(ArrayList<DishListItem> dishes, int position) {
    Toast.makeText(this, dishes.get(position).getDishName() +" clicked!", Toast.LENGTH_SHORT).show();
    SingleDishEnhancedView singleDishEnhancedView = SingleDishEnhancedView.newInstance(dishes, position);
    singleDishEnhancedView.show(getFragmentManager(), "DishDisplay");
}
}

吐司仅用于测试目的，但它们也不会显示。我希望我不是完全愚蠢但我似乎无法找到问题的答案。谢谢你的时间。

编辑：我还应该提一下，我既没有收到编译错误，也没有在任何时候崩溃。该列表是可滚动的，并且行为与您期望的一样，您甚至可以在点击其中一个项目时看到点击动画。

EDIT2：我更新了代码，因为评论指出了一些重要的内容丢失了。我希望更新的代码能够更清晰。

Answer 1

解决方案相当简单，onItemClick方法必须使用ListView而不是AdapterView，虽然我不确定为什么这不会导致崩溃或至少某种警告。无论哪种方式，问题都解决了。感谢您的评论，他们以正确的方式引导我。

onItemClick未正确调用

1 个答案: