将ListView choiceMode从singleChoice更改为multipleChoiceModal

Question

我有一个通常是的ListView singleChoice choiceMode.当用户长按项目时,我想进入允许选择多个项目的动作模式,以便他们可以对任何选定的项目执行操作.

我能够配置它ListView以使其处于singleChoice模式,并且用户能够选择列表项以在其旁边显示细节片段并使列表项本身显示为其激活状态.

我也能够配置它ListView以便multipleChoiceModal choiceMode在项目中执行长按并启动动作模式并允许多个选择,但现在ListView将不允许在正常模式下进行单个选择(无动作模式).

如何处理singleChoice模式中的ListView,然后multipleChoiceModal在长按项目时将其转换为模式？

这是我能够提出的最接近的:

1. 将ListView设置为singleChoice模式
2. 设置ListView OnItemLongClickListener并在该侦听器中:
   1. 将ListView设置OnItemLongClickListener为null
   2. 将ListView设置choiceMode为multipleChoiceModal
   3. 调用view.performClick()长按的项目.

这种方法有几个问题.

1. 直到第二次长按项目时才开始操作模式.
2. 当我打电话给我时getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE);,onDestroyActionMode我得到一个java.lang.StackOverflowError因为该方法最终也试图破坏动作模式(但我们还没有从破坏中返回).

Answer 1

这个选择模式切换真的很糟糕,因为我没有干净简单的解决方案.HFM(有信仰的人)和KISS(保持简单的愚蠢)帮助;)

1.启动单模式选择并设置所有监听器(这是在设置列表适配器的地方完成的)

listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE); 
listView.setOnItemLongClickListener(liListener);
listView.setMultiChoiceModeListener(mcListener);

2.实现接口以在选择模式之间切换.让它工作的TRICK是在实现之外切换回单选模式,这意味着在你破坏动作模式之后!所以只需使用一个简单的标志来标记CAB破坏.另一个TRICK是返回false onItemLongClick,以便选择模式有时间生效.

private OnItemLongClickListener liListener = new OnItemLongClickListener() {
        @Override
        public boolean onItemLongClick(AdapterView<?> parent, View view,
                int position, long id) {                
            listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE_MODAL);
            isCABDestroyed = false;                 
            return false; // so this action does not consume the event!!!
        }
    };

private MultiChoiceModeListener mcListener = new MultiChoiceModeListener() {
    @Override
    public void onItemCheckedStateChanged(ActionMode mode, int position,
                                          long id, boolean checked) {
        final int checkedCount = listView.getCheckedItemCount();
        switch (checkedCount) {
            case 0:
                mode.setSubtitle(null);
                break;
            case 1:
                mode.setSubtitle("One item selected");
                break;
            default:
                mode.setSubtitle("" + checkedCount + " items selected");
                break;
        }
    }

    @Override
    public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
        switch (item.getItemId()) {
            case R.id.delete:
                //do your action command here
                mode.finish();
                return true;
            default:
                return false;
        }
    }

    @Override
    public boolean onCreateActionMode(ActionMode mode, Menu menu) {
        MenuInflater inflater = mode.getMenuInflater();
        inflater.inflate(R.menu.context_menu, menu);
        return true;
    }

    @Override
    public void onDestroyActionMode(ActionMode mode) {
        isCABDestroyed = true; // mark readiness to switch back to SINGLE CHOICE after the CABis destroyed  

    }

    @Override
    public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
        return false;
    }
};

这是转回来的

    @Override
    public void onListItemClick(ListView l, View v, int position, long id) {
        super.onListItemClick(l, v, position, id);  
        if(isCABDestroyed) {
            listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
            //do your action command  here
        }
        l.setItemChecked(position, true);

    }

Answer 2

我在我的一个程序中使用了这个

ListView.CHOICE_MODE_MULTIPLE_MODAL那时的我们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);
        }
    }

}

这允许单选单列表视图单击和长按多选。这全部是从 ICS 消息应用程序中提取的，因此您也可以浏览它