android - Android ListFragment:onListItemClickとonContextItemSelectedの両方を持つ方法は?

Question

私は ListActivity と ListFragment を実装しており、ユーザーが短いタップと長いタップを使用できるようにしたいと考えています。短いタップはアイテムの詳細を編集/表示し、長いタップはアイテムを削除するオプションを含むコンテキストメニューを表示します。 . ただし、onCreateContextMenu をトリガーすることはできないようです。onListItemClick は正常に機能し、短いタップでも長いタップでもすべてキャプチャします。ListFragment は、レイアウトファイルを使用せずに、わずかにカスタム化された SimpleCursorAdaptor と LoaderManager を使用して設定されます。

両方を持つことは可能ですか？

コード...

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);
}

}

更新：私はまだこれを理解していません.この戦略を放棄して、ユーザーフレンドリーな方法ではない別の方法で実装する必要があるかどうか疑問に思っています. おそらく、スワイプして詳細を表示し、タップして削除しますか?

score 4 · Accepted Answer

答えは、ネイティブメールアプリの Android ソースコードにありました。https://android.googlesource.com/platform/packages/apps/Email/

ListFragment はリスナーを実装する必要があります。

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);
    }

呼び出されるメソッドは次のとおりです。

 /**
  * 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);
}

完全を期すために、ここにローダーコードがあります

// 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);
}

android - Android ListFragment:onListItemClickとonContextItemSelectedの両方を持つ方法は?

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