Question

我正在使用ListFragment（不是来自支持库）。我有SimpleCursorAdapter，我正在使用android.R.layout.simple_list_item_2。数据显示完全正常，但我没有在onListItemClick方法中收到任何内容。

我试图实现自己的自定义适配器，扩展CursorAdapter。同样，数据显示正常，但没有触发任何点击事件。

接下来，我尝试从here复制默认ListFragment布局的来源。再一次，没有骰子。

再次，我正在使用android.R.layout.simple_list_item_2。我还尝试了simple_list_item_1。两者都给了我一个问题，我以前从来没有遇到过这些问题。

我的目标是API 15+，因此我没有使用支持库。

我还应该尝试做些什么呢？

修改 ListFragment实施代码。其中大部分是由Android Studio自动生成的。自动生成的代码包含支持库，我将其更改为标准包。

import android.app.Activity;
import android.app.ListFragment;
import android.app.LoaderManager;
import android.content.CursorLoader;
import android.content.Loader;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.ContextMenu;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.CursorAdapter;
import android.widget.ListView;

import com.parse.ParseUser;
import com.blah.adapters.SuggestionCursorAdapter;
import com.blah.models.DateActivity;
import com.blah.provider.Contracts;
import com.blah.provider.UpdateService;

public class DateActivityListFragment extends ListFragment implements LoaderManager.LoaderCallbacks<Cursor> {

    private static final String TAG = DateActivityListFragment.class.getSimpleName();
    /**
     * The serialization (saved instance state) Bundle key representing the
     * activated item position. Only used on tablets.
     */
    private static final String STATE_ACTIVATED_POSITION = "activated_position";

    /**
     * The fragment's current callback object, which is notified of list item
     * clicks.
     */
    private Callbacks mCallbacks = sDummyCallbacks;

    /**
     * The current activated item position. Only used on tablets.
     */
    private int mActivatedPosition = ListView.INVALID_POSITION;

    private SuggestionCursorAdapter mAdapter;

    /**
     * A callback interface that all activities containing this fragment must
     * implement. This mechanism allows activities to be notified of item
     * selections.
     */
    public interface Callbacks {
        /**
         * Callback for when an item has been selected.
         */
        public void onItemSelected(DateActivity dateActivity);

        /**
         * Callback for when a new item should be created.
         */
        public void onNewItem();
    }

    /**
     * A dummy implementation of the {@link Callbacks} interface that does
     * nothing. Used only when this fragment is not attached to an activity.
     */
    private static Callbacks sDummyCallbacks = new Callbacks() {
        @Override
        public void onItemSelected(DateActivity dateActivity) {
        }

        @Override
        public void onNewItem() {
        }
    };

    /**
     * Mandatory empty constructor for the fragment manager to instantiate the
     * fragment (e.g. upon screen orientation changes).
     */
    public DateActivityListFragment() {
    }

    final static String[] FROM = {Contracts.DateActivities.C_NAME, Contracts.DateActivities.C_DESCRIPTION};
    final static int[] TO = {android.R.id.text1, android.R.id.text2};

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

        mAdapter = new SuggestionCursorAdapter(getActivity(), null);
//        mAdapter = new SimpleCursorAdapter(getActivity(), android.R.layout.simple_list_item_2, null, FROM, TO, CursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER);
        setListAdapter(mAdapter);

        getLoaderManager().initLoader(0, null, this);
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        setHasOptionsMenu(true);
        registerForContextMenu(getListView());
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_dateactivity_list, container, false);
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        // Restore the previously serialized activated item position.
        if (savedInstanceState != null
                && savedInstanceState.containsKey(STATE_ACTIVATED_POSITION)) {
            setActivatedPosition(savedInstanceState.getInt(STATE_ACTIVATED_POSITION));
        }
    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);

        // Activities containing this fragment must implement its callbacks.
        if (!(activity instanceof Callbacks)) {
            throw new IllegalStateException("Activity must implement fragment's callbacks.");
        }

        mCallbacks = (Callbacks) activity;
    }

    /////////////// OPTIONS MENU
    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        super.onCreateOptionsMenu(menu, inflater);
        inflater.inflate(R.menu.suggestion, menu);
        final ParseUser parseUser = ParseUser.getCurrentUser();
        // Only show add button for dev user
        if (parseUser != null && !parseUser.getUsername().equals("dev")) {
            menu.findItem(R.id.menu_add).setVisible(false);
        }
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();
        if (id == R.id.menu_add) {
            mCallbacks.onNewItem();
            return true;
        }
        if (id == R.id.menu_refresh) {
            UpdateService.startActionUpdate(getActivity());
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
    /////////////// END OPTIONS MENU

    /////////////// CONTEXT MENU
    @Override
    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
        final MenuInflater menuInflater = getActivity().getMenuInflater();
        menuInflater.inflate(R.menu.suggestion_context, menu);
        // Set menu title
        final AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) menuInfo;
        final Cursor cursor = (Cursor) getListAdapter().getItem(info.position);
        menu.setHeaderTitle(cursor.getString(Contracts.DateActivities.I_NAME));
        super.onCreateContextMenu(menu, v, menuInfo);
    }

    @Override
    public boolean onContextItemSelected(MenuItem item) {
        int id = item.getItemId();
        if (id == R.id.menu_delete) {
            AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) item.getMenuInfo();
            final Cursor cursor = (Cursor) getListAdapter().getItem(info.position);
            // TODO promopt, are you sure first
            // delete from service.
            UpdateService.startActionDeleteItem(getActivity(), new DateActivity(cursor),
                    cursor.getLong(Contracts.DateActivities.I_ID));
            return true;
        }
        return super.onContextItemSelected(item);
    }
    /////////////// END CONTEXT MENU

    @Override
    public void onDetach() {
        super.onDetach();

        // Reset the active callbacks interface to the dummy implementation.
        mCallbacks = sDummyCallbacks;
    }

    @Override
    public void onListItemClick(ListView listView, View view, int position, long id) {
        Log.v(TAG, "onListItemClick");
        super.onListItemClick(listView, view, position, id);
        Cursor c = ((CursorAdapter) listView.getAdapter()).getCursor();
        c.moveToPosition(position);
        mCallbacks.onItemSelected(new DateActivity(c));
        c.close();
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        if (mActivatedPosition != ListView.INVALID_POSITION) {
            // Serialize and persist the activated item position.
            outState.putInt(STATE_ACTIVATED_POSITION, mActivatedPosition);
        }
    }

    /**
     * Turns on activate-on-click mode. When this mode is on, list items will be
     * given the 'activated' state when touched.
     */
    public void setActivateOnItemClick(boolean activateOnItemClick) {
        // When setting CHOICE_MODE_SINGLE, ListView will automatically
        // give items the 'activated' state when touched.
        getListView().setChoiceMode(activateOnItemClick
                ? ListView.CHOICE_MODE_SINGLE
                : ListView.CHOICE_MODE_NONE);
    }

    private void setActivatedPosition(int position) {
        if (position == ListView.INVALID_POSITION) {
            getListView().setItemChecked(mActivatedPosition, false);
        } else {
            getListView().setItemChecked(position, true);
        }

        mActivatedPosition = position;
    }

    @Override
    public Loader<Cursor> onCreateLoader(int i, Bundle bundle) {
        final Uri baseUri = Contracts.DateActivities.CONTENT_URI;
        return new CursorLoader(getActivity(), baseUri,
                Contracts.DateActivities.SELECT_ALL_PROJECTION, null, null, null);
    }

    @Override
    public void onLoadFinished(Loader<Cursor> cursorLoader, Cursor cursor) {
        mAdapter.swapCursor(cursor);
    }

    @Override
    public void onLoaderReset(Loader<Cursor> cursorLoader) {
        mAdapter.swapCursor(null);
    }
}

Answer 1

将父活动更改为常规活动，而不是ListActivity。

Answer 2

以上回答 - 将家长活动从ListActivity更改为Activity - 这对我有用

未调用ListFragment onListItemClick

2 个答案: