Question

I have a ListView that normally is the singleChoice choiceMode. When the user long presses on an item, I want to enter an action mode that allows selecting multiple items so they can perform an action on any selected items.

I am able to configure the ListView so that it is in singleChoice mode and the user is able to select list items to display a details fragment next to it and have the list item itself shown in its activated state.

I am also able to configure the ListView so that it is in the multipleChoiceModal choiceMode and performing a long press on an item starts the action mode and allows multiple selections, but now the ListView will not allow a single selection in the normal mode (no action mode).

How can I have a ListView that is in singleChoice mode and then transition it to multipleChoiceModal mode when an item is long pressed?

This is the closest I’ve been able to come up with:

1. set the ListView to singleChoice mode
2. set the ListView’s OnItemLongClickListener and in that listener:
   1. set the ListView’s OnItemLongClickListener to null
   2. set the ListView’s choiceMode to multipleChoiceModal
   3. call view.performClick() on the item that was long pressed.

This approach has a couple problems.

1. The action mode isn’t started until the second time I long press on an item.
2. When I call getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE); in onDestroyActionMode I get a java.lang.StackOverflowError because that method ends up trying to destroy the action mode as well (but we have no yet returned from the destroy).

Answer 1

I used this in one of my programs

us the ListView.CHOICE_MODE_MULTIPLE_MODAL then lv.setMultiChoiceModeListener(new ModeCallBack());

    public class ModeCallBack implements ListView.MultiChoiceModeListener{

    View mSelectView;
    TextView mSelectedCount;
    ArrayList<Long> mCheckedItems;

    @Override
    public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
        SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(getActivity());
        SharedPreferences.Editor edit = pref.edit();

        if(item.getItemId() == R.id.bowler_delete){

            for(int i=0; i<mCheckedItems.size(); i++){
                long id = mCheckedItems.get(i);

                getActivity().getContentResolver().delete(BowlersDB.CONTENT_URI,BowlersDB.ID+"="+id,null);
            }
        }else if(item.getItemId() == R.id.bowler_add_ball){
            if(mCheckedItems.size() > 1){
                Toast.makeText(getActivity(),"Can only add bowling balls to one bowler at a time",Toast.LENGTH_SHORT).show();
            }else{
                edit.putLong(Preferences.BOWLER_SELECTED_FOR_BALL,mCheckedItems.get(0)).commit();

                ListFragment lf = new ManufacturersList();
                FragmentTransaction ft;
                ft = getFragmentManager().beginTransaction();
                ft.replace(R.id.frameOne, lf).addToBackStack(null).commit();
                //mRemover.rFragment();
            }
        }else if(item.getItemId() == R.id.add_bowler_to_team){
            for(int i=0; i<mCheckedItems.size(); i++){

                long id = mCheckedItems.get(i);
                ContentValues values = new ContentValues();
                values.put(TeamBowlers.BOWLER_ID,id);
                values.put(TeamBowlers.TEAM_ID,pref.getLong(Preferences.TEAM_SELECTED,1));
                getActivity().getContentResolver().insert(TeamBowlers.CONTENT_URI, values);

            }
            FragmentManager fm = getFragmentManager();
            fm.popBackStack();
        }
        mode.finish();
        return true;
    }

    @Override
    public boolean onCreateActionMode(ActionMode mode, Menu menu) {
        MenuInflater inflate = getActivity().getMenuInflater();
        if(fromTeam){
            inflate.inflate(R.menu.bowlers_team_action_menu, menu);
        }else{
            inflate.inflate(R.menu.bowler_action_menu, menu);
        }
        if(mSelectView == null){
            mSelectView = (ViewGroup)LayoutInflater.from(getActivity()).inflate(R.layout.select_count_layout,null);

            mSelectedCount = (TextView)mSelectView.findViewById(R.id.count_tv);

        }
        if(mCheckedItems == null){
            mCheckedItems = new ArrayList<Long>();
        }
        mode.setCustomView(mSelectView);
        return true;
    }

    @Override
    public void onDestroyActionMode(ActionMode mode) {
        mCheckedItems = null;

    }

    @Override
    public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
        if(mSelectView == null){
            mSelectView = (ViewGroup)LayoutInflater.from(getActivity()).inflate(R.layout.select_count_layout,null);

            mSelectedCount = (TextView)mSelectView.findViewById(R.id.count_tv);
        }

        if(mCheckedItems == null){
            mCheckedItems = new ArrayList<Long>();
        }
        return true;
    }

    @Override
    public void onItemCheckedStateChanged(ActionMode mode, int position,long id, boolean checked) {         

        final int count = lv.getCheckedItemCount();
        mSelectedCount.setText(String.valueOf(count));
        if(checked){
            mCheckedItems.add(id);
        }else{
            mCheckedItems.remove(id);
        }
    }

}

this allows for single choice single listview click and long click multiple selection. This was all pulled from the ICS messaging app so you can browse that too