How to find out if item is selected in CHOICE_MODE_MULTIPLE_MODAL inside custom ArrayAdapter?

Question

Here is my problem: I have a ListView with a custom ArrayAdapter:

My list in onCreate():

list = /*some list*/
listView = (ListView) findViewById(R.id.some_list);
listView.setAdapter(new MapListAdapter(this, R.layout.custom_list_item, list));
listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE_MODAL);

listView.setOnItemClickListener(new OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        listView.setItemChecked(position, true);
    }
});

mapListView.setMultiChoiceModeListener(new MultiChoiceModeListener() {

    @Override
    public boolean onPrepareActionMode(...) {
        // some unrelated working code 
    }

    @Override
    public void onDestroyActionMode(...) {
        // some unrelated working code  
    }

    @Override
    public boolean onCreateActionMode(...) {
        // some unrelated working code 
    }

    @Override
    public boolean onActionItemClicked(...) {
        // some unrelated working code 
    }

    @Override
    public void onItemCheckedStateChanged(...) {
        // some unrelated working code 
    }
});

My custom ArrayAdapter's getView(...):

@Override
public View getView (int position, View view, ViewGroup parent) {
    view = (LinearLayout) inflater.inflate(layoutId, null);

    final ListItem entry = getItem(position);

    // setting some textviews here and so on...

    CheckBox checkBox = (CheckBox) view.findViewById(R.id.m_l_i_checkbox);
    // my problem ^

    return view;
}

I know that certain list items are selected, because ActionMode bar appears as I select them and disappears as I unselect(toggle) all of them. However, I want to have checkBox that would indicate if they indeed are selected. So how do I do that? It works just fine with android.R.single_list_item_multiple_choice and default ArrayAdapter, but I want to use my custom one. Maybe I'm getting something wrong and there is another way to do it?

Answer 1

I implement a similar behavior custom adapter by adding a "special" field in my Item class called isSelectedOnList (Boolean). Then in the OnItemClickListener I do like this:

listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
    mapListView.setItemChecked(position, true);
    ...Get your item here...getItem(position).setIsSelectedOnList(!getItem(position).isSelectedOnList());
}
});

So now my Items Array knows which items are selected. Then in the getView method I update the checkbox which is in my item layout xml:

@Override
public View getView (int position, View view, ViewGroup parent) {
    view = (LinearLayout) inflater.inflate(layoutId, null);

    final ListItem entry = getItem(position);

    // setting some textviews here and so on...

    CheckBox checkBox = (CheckBox) view.findViewById(R.id.m_l_i_checkbox);
    // my problem ^

    checkBox.setChecked(ListItem.isSelectedOnList());

    return view;
}

This solution works for me pretty well so I didn't care to look in android's internal mechanism for selected items in multi-select lists.

Hope this helps...