How to prevent close action mode when no item is selected

Question

I used action mode to show selection mode, but when the selected item count is 0, it will auto exit action mode. I want to keep in selection mode unless user press back key.

ModeCallback mModeCallBack = new ModeCallback();
mGridview.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE_MODAL);
mGridview.setMultiChoiceModeListener(mModeCallBack);

private class ModeCallback implements GridView.MultiChoiceModeListener {
...
}

Answer 1

I have fixed this issue.

@Override
public void onItemCheckedStateChanged(ActionMode mode, int position, long id, boolean checked) {
    ...
    mCheckedCount = mGridview.getCheckedItemCount();
    // if we unselect the last item, cout is 0, we set it to -1, so it will not exit action mode(because if cout==0, mode.finish()).
    // if we select 1 item, we should plus this "1" back. unless the count will be woring.
    if (mCheckedCount == 0) {
        Utils.modifyFileValue(mGridview, "mCheckedItemCount", mCheckedCount + (checked ? 1 : -1));
    }

    String title = "";
    // we must get the count again, because we changed it.
    mCheckedCount = mGridview.getCheckedItemCount();
    title = mContext.getResources().getString(R.string.select_albums, mCheckedCount > 0 ? mCheckedCount : 0);

    mSelectedConvCount.setText(title);

    ....

    if (checked) {
        mSelectedIds.add(selectedId);
    } else {
        mSelectedIds.remove(selectedId);
    }
}

public static void modifyFileValue(Object object, String filedName, int filedValue) {
    //for my case, I want to get mCheckedItemCount in AbsListView.class, but i passed Gridview, so it should getSuperclass(). because GridView don't have mCheckedItemCount.
    Class classType = object.getClass().getSuperclass();
    Field fild = null;
    try {
        fild = classType.getDeclaredField(filedName);
        fild.setAccessible(true);
        fild.set(object, filedValue);
    } catch (NoSuchFieldException ex) {
        ex.printStackTrace();
    } catch (Exception ex) {
        ex.printStackTrace();
    }
}