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Android ListFragment: how to have both onListItemClick and onContextItemSelected?

I implement ListActivity and ListFragment and would like to allow the user to use short taps and long taps - a short time to edit / show the item details and a long press to bring up a context menu with the option to delete the item. However, it seems like I cannot run onCreateContextMenu. onListItemClick works great and captures all taps, short or long. The ListFragment is populated using the small custom SimpleCursorAdaptor and LoaderManager, without using a layout file.

Is it possible to have both?

code...

LocationsListFragment.java package com.level3.connect.locations; //import removed for brevity public class LocationsListFragment extends SherlockListFragment implements LoaderManager.LoaderCallbacks<Cursor>{ private static final int DELETE_ID = Menu.FIRST + 1; private SimpleCursorAdapter adapter; private OnLocationSelectedListener locationSelectedListener; // the activity attaching to this fragment should implement this interface public interface OnLocationSelectedListener { public void onLocationSelected(String locationId); } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Fields from the database (projection) // Must include the _id column for the adapter to work String[] from = new String[] { LocationsTable.LOCATION_NAME, LocationsTable.LOCATION_PHONE_NAME }; // Fields on the UI to which we map int[] to = new int[] { R.id.titleText, R.id.phoneText }; // connect to the database getLoaderManager().initLoader(0, null, this); adapter = new LocationCursorAdapter(getActivity(), R.layout.location_row, null, from, to, 0); setListAdapter(adapter); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View root = super.onCreateView(inflater, container, savedInstanceState); registerForContextMenu(root); //this is called fine return root; } // hook up listening for the user selecting a location in the list @Override public void onAttach(Activity activity) { super.onAttach(activity); try { locationSelectedListener = (OnLocationSelectedListener) activity; } catch (ClassCastException e) { throw new ClassCastException(activity.toString() + " must implement OnLocationSelectedListener"); } } // handle user tapping a location - show a detailed view - this works fine @Override public void onListItemClick(ListView l, View v, int position, long id) { String projection[] = { LocationsTable.KEY_ID }; Cursor locationCursor = getActivity().getContentResolver().query( Uri.withAppendedPath(DatabaseContentProvider.CONTENT_URI, String.valueOf(id)), projection, null, null, null); if (locationCursor.moveToFirst()) { String locationUrl = locationCursor.getString(0); locationSelectedListener.onLocationSelected(locationUrl); } locationCursor.close(); } // Context menu - this is never called @Override public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) { super.onCreateContextMenu(menu, v, menuInfo); menu.add(0, DELETE_ID, 0, R.string.menu_delete); } @Override - this is never called public boolean onContextItemSelected(android.view.MenuItem item) { switch (item.getItemId()) { case DELETE_ID: AdapterContextMenuInfo info = (AdapterContextMenuInfo) item .getMenuInfo(); Uri uri = Uri.parse(DatabaseContentProvider.CONTENT_URI + "/" + info.id); getActivity().getContentResolver().delete(uri, null, null); return true; } return super.onContextItemSelected(item); } // Loader code // Creates a new loader after the initLoader () call @Override public Loader<Cursor> onCreateLoader(int id, Bundle args) { String[] projection = { LocationsTable.KEY_ID, LocationsTable.LOCATION_NAME, LocationsTable.LOCATION_PHONE_NAME }; CursorLoader cursorLoader = new CursorLoader(getActivity(), DatabaseContentProvider.CONTENT_URI, projection, null, null, null); return cursorLoader; } @Override public void onLoadFinished(Loader<Cursor> loader, Cursor data) { adapter.swapCursor(data); } @Override public void onLoaderReset(Loader<Cursor> loader) { // data is not available anymore, delete reference adapter.swapCursor(null); } }

UPDATE: I still do not understand this, and I wonder if I need to abandon this strategy and implement it in some other way, and not in a user-friendly form. Perhaps swipe to view details and tap to delete?

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1 answer

I found my answer in the Android source code for my own email application. https://android.googlesource.com/platform/packages/apps/Email/

ListFragment must have listeners implemented:

 public class MessageListFragment extends SherlockListFragment implements LoaderManager.LoaderCallbacks<Cursor>, AdapterView.OnItemLongClickListener private static final int DELETE_ID = Menu.FIRST + 1; private SimpleCursorAdapter adapter; // The LoaderManager needs initializing @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Fields from the database (projection) // Must include the _id column for the adapter to work String[] from = new String[] { BookmarksTable.BOOKMARK_NAME, BookmarksTable.BOOKMARK_PHONE_NAME }; // Fields on the UI to which we map int[] to = new int[] { R.id.titleText, R.id.phoneText }; // connect to the database getLoaderManager().initLoader(0, null, this); adapter = new BookmarkCursorAdapter(getActivity(), R.layout.bookmark_row, null, from, to, 0); setListAdapter(adapter); } // register to put up the context menu @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View root = super.onCreateView(inflater, container, savedInstanceState); registerForContextMenu(root); return root; } // set the listeners for long click @Override public void onViewCreated(View view, Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE); getListView().setOnItemLongClickListener(this); }

Called Methods:

  /** * Called when a message is clicked. */ @Override public void onListItemClick(ListView parent, View view, int position, long id) { // do item click stuff; show detailed view in my case } @Override public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) { return false; // let the system show the context menu } // Context menu @Override public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) { super.onCreateContextMenu(menu, v, menuInfo); menu.add(0, DELETE_ID, 0, R.string.menu_delete); } // respond to the context menu tap @Override public boolean onContextItemSelected(android.view.MenuItem item) { switch (item.getItemId()) { case DELETE_ID: AdapterContextMenuInfo info = (AdapterContextMenuInfo) item .getMenuInfo(); Uri uri = Uri.parse(DatabaseContentProvider.BOOKMARK_ID_URI + Long.toString(info.id)); getActivity().getContentResolver().delete(uri, null, null); return true; } return super.onContextItemSelected(item); }

For completeness, here's the bootloader code

 // Loader code // Creates a new loader after the initLoader () call @Override public Loader<Cursor> onCreateLoader(int id, Bundle args) { String[] projection = { BookmarksTable.KEY_ID, BookmarksTable.BOOKMARK_NAME, BookmarksTable.BOOKMARK_PHONE_NAME }; CursorLoader cursorLoader = new CursorLoader(getActivity(), DatabaseContentProvider.BOOKMARKS_URI, projection, null, null, null); return cursorLoader; } @Override public void onLoadFinished(Loader<Cursor> loader, Cursor data) { adapter.swapCursor(data); } @Override public void onLoaderReset(Loader<Cursor> loader) { // data is not available anymore, delete reference adapter.swapCursor(null); }
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Source: https://habr.com/ru/post/1478876/

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