1

我有一个已为上下文菜单注册的列表视图。对于列表中的某些项目，上下文菜单不适用。在这些情况下，我只是不在 onCreateContextMenu 方法中扩充菜单。

不幸的是，这意味着当长按不显示上下文菜单的项目时，Android 会将其处理为短按（可能是因为上下文菜单通常会返回 true 以表示长按事件已被处理）。

这会导致列表视图中的行为不一致 - 当您长按某些项目时，它们会显示上下文菜单 - 其他项目则不会，然后执行默认的单击行为。如何确保即使不显示上下文菜单的项目也会使用长按，以便不调用 onItemClick 方法？

@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {

  AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) menuInfo;
  Playable playable = (Playable) info.targetView.getTag(R.id.playable);
  if (playable != null && !(playable instanceof AutoRadioStation) && !(playable.getId().equals(Playlist.AUTOMATIC_PLAYLIST))) {
    v.setTag(R.id.playable, playable); // This copies the tag so that it is contained within the view used for the menu.
    Drawable stationImage = (Drawable) ((ImageView) info.targetView.findViewById(R.id.artwork)).getDrawable().getConstantState().newDrawable();

    menu.setHeaderTitle(playable.getName());
    menu.setHeaderIcon(stationImage);
    MenuInflater inflater = getActivity().getMenuInflater();
    inflater.inflate(R.menu.saved_context_menu, menu);
  }
}
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2 回答 2

1

我有一个类似的问题，我最终使用 aDialog而不是上下文菜单。

我的活动实现了，如果满足条件OnItemLongClickListener，我会显示它 。onLongItemClick()

于 2012-06-01T13:19:52.663 回答
1

我终于开始实施 NathanZ 解决方案的一个版本。似乎没有太多关于将 contextMenu 转换为 DialogFragment 的内容，因此我将在此处粘贴大部分解决方案。

实现 onLongItemClick 侦听器还意味着我能够拥有一个不需要列表视图中的菜单的长按事件。不幸的是，因为您不能将菜单传递给对话框，所以我不得不重用现有的 ListViewElement 类型来存储列表视图中每个“菜单”项的 id 和文本字符串。

  @Override
  public boolean onItemLongClick(AdapterView<?> parent, View view, int item, long position) {

    Playable playable = (Playable) view.getTag(R.id.playable);
    //Switch haptic feedback off by default so if we don't handle the long click we don't vibrate
    parent.setHapticFeedbackEnabled(false);

    if (playable == null) {
      // This must be a message bar so the only option is to update all saved content
      updateAll();
      parent.setHapticFeedbackEnabled(true);
    } else {
      if (!(playable instanceof AutoRadioStation) && !(playable.getId().equals(Playlist.AUTOMATIC_PLAYLIST))) {
        Drawable drawable = (Drawable) ((ImageView) view.findViewById(R.id.artwork)).getDrawable().getConstantState().newDrawable();
        showContextDialog(playable, drawable);
        parent.setHapticFeedbackEnabled(true);
      }
    }
    return true;
  }
  private void showContextDialog(Playable playable, Drawable drawable) {
    FragmentManager fm = getActivity().getSupportFragmentManager();
    final List<ListViewElement> array = new ArrayList<ListViewElement>();
    array.add(new ListViewElement(R.id.menu_share, null, getString(R.string.share), true));
    array.add(new ListViewElement(R.id.menu_delete, null, getString(R.string.delete), true));
    ContextMenuDialog dialog = new ContextMenuDialog(drawable, playable.getName(), array, playable);
    dialog.setOnItemClickListener(this);
    dialog.show(fm, "Context Menu");
  }

  //Callback from the ContextMenuDialog class
  @Override
  public void onItemClickDialogFragment(int option, Playable playable) {
    switch (option) {
      case R.id.menu_delete :
        // Perform delete actions
        break;
      case R.id.menu_share :
        // Perform share actions
        break;
    }
  }


public class ContextMenuDialog extends DialogFragment implements OnItemClickListener {

  private Drawable drawableIcon;
  private String title;
  private List<ListViewElement> values;
  private Playable playable;
  private DialogFragmentOnItemClickListener listener;

  public interface DialogFragmentOnItemClickListener {
    void onItemClickDialogFragment(int option, Playable playable);
  }

  public void setOnItemClickListener(DialogFragmentOnItemClickListener listener) {
    this.listener = listener;
  }

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    //Create the dialog without a title since the layout includes a customized title
    setStyle(DialogFragment.STYLE_NO_TITLE, R.style.MyDialogStyle);
  }

  public ContextMenuDialog(Drawable drawableIcon, String title, List<ListViewElement> values, Playable playable) {
    this.drawableIcon = drawableIcon;
    this.title = title;
    this.values = values;
    this.playable = playable;
  }


  public ContextMenuDialog(int drawableResource, String title, List<ListViewElement> values, Playable playable) {
    this.drawableIcon = getResources().getDrawable(drawableResource);
    this.title = title;
    this.values = values;
    this.playable = playable;
  }

  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.context_menu, container, true);
    TextView titleView = (TextView) view.findViewById(R.id.context_menu_title);
    titleView.setText(title);
    ImageView icon = (ImageView) view.findViewById(R.id.context_menu_artwork);
    icon.setImageDrawable(drawableIcon);

    ListView listView = (ListView) view.findViewById(R.id.context_menu_listview);
    ContextMenuAdapter adapter = new ContextMenuAdapter(getActivity(), R.layout.context_menu_list_item, values);
    listView.setAdapter(adapter);
    listView.setOnItemClickListener(this);
    return view;
 }
于 2012-08-01T08:45:02.223 回答