从列表中删除项目后，扩展项目的位置不会在 ExpandableListView 上刷新 - Android？

Question

我有问题。我有一个 ExpandableListView 和一个从 BaseExpandableListAdapter 扩展而来的自定义适配器。我有一个 ArrayList，其中包含我的组和组的子项。

问题是：

1)展开第3组

2) 从ArrayList 中删除第一项并notifyDataSetInvalidated, notifyDataSetChanged

3) getGroupView要求正确，我可以设置我需要的。

4) 但旧位置 (3) 要求 getChildView。删除第一项时，索引会更改。但是 ListView 试图获取旧位置的子视图。

这是我的理解。哪里有问题？

这是我的适配器：

public class DashboardAdapter extends BaseExpandableListAdapter implements View.OnClickListener {

private static final String TAG = DashboardAdapter.class.getSimpleName();
private static final int groupTypeCount = GroupType.values().length;
private final Activity activity;
private final ExpandableListView exListView;
private final List<Object> dashboard = new ArrayList<>();
private String lastExpandedProductIban = null;

public DashboardAdapter(final Activity activity, ExpandableListView expandableListView) {
    this.activity = activity;
    exListView = expandableListView;
}

public void setDashboard(final List<Object> dashboard) {
    if (Verify.notNull(dashboard)) {
        this.dashboard.clear();
        this.dashboard.addAll(dashboard);
}


@Override
public int getGroupTypeCount() {
    return groupTypeCount;
}

@Override
public int getGroupType(int groupPosition) {
    final Object group = getGroup(groupPosition);
    if (group instanceof Dashboard.Products.Accordion)
        return GroupType.PRODUCT_ACCORDION.ordinal();

    return -1;
}

@Override
public int getGroupCount() {
    return dashboard.size();
}

@Override
public int getChildrenCount(int groupPosition) {
    if (getGroupType(groupPosition) == GroupType.PRODUCT_ACCORDION.ordinal())
        return ((Dashboard.Products.Accordion) getGroup(groupPosition)).actions.size();
    return 0;
}

@Override
public Object getGroup(int groupPosition) {
    if (groupPosition >= 0 && groupPosition < dashboard.size())
        return dashboard.get(groupPosition);
    return null;
}

@Override
public Object getChild(int groupPosition, int childPosition) {
    if (getGroupType(groupPosition) == GroupType.PRODUCT_ACCORDION.ordinal()) {
        final Dashboard.Products.Accordion group = (Dashboard.Products.Accordion) getGroup(groupPosition);

        if (group != null && childPosition >= 0 && childPosition < group.actions.size())
            return group.actions.get(childPosition);
    }
    return null;
}

@Override
public long getGroupId(int groupPosition) {
    return groupPosition;
}

@Override
public long getChildId(int groupPosition, int childPosition) {
    return childPosition;
}

@Override
public boolean hasStableIds() {
    return true;
}

@Override
public View getGroupView(final int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
    // initialise all possible ViewHolders
    ViewHolderAccordion viewHolderAccordion = null;
    // get GroupType of the current View
    final GroupType groupType = GroupType.valueOf(getGroupType(groupPosition));

    // Inflate the layout if convertView is null
    if (convertView == null) {
        LayoutInflater inflater = activity.getLayoutInflater();

        switch (groupType) {
            case PRODUCT_ACCORDION:
                convertView = inflater.inflate(R.layout.item_dashboard_accordion, parent, false);
                viewHolderAccordion = new ViewHolderAccordion(convertView);
                break;
        }
    }
    // reuse convertView if it isn't null
    else {
        switch (groupType) {
            case PRODUCT_ACCORDION:
                viewHolderAccordion = ((ViewHolderAccordion) convertView.getTag()).reset();
                break;
        }
    }



    if (viewHolderAccordion != null) {
        final Dashboard.Products.Accordion accordion = (Dashboard.Products.Accordion) getGroup(groupPosition);

        // set alternating background color
        //if(dashboardGroups.accounts.indexOf(account) % 2 == 0)
        //convertView.setBackgroundColor(activity.getResources().getColor(R.color.dashboard_account_alternate_color));

        // populate view with content
        if (accordion != null) {
            setText(viewHolderAccordion.tvProductAccordionName, accordion.title);
            setText(viewHolderAccordion.tvProductAccordionDetail, accordion.detail);
            setText(viewHolderAccordion.tvProductAccordionBalance, accordion.balance);

            boolean _isExpanded = getPositionFromIban(lastExpandedProductIban) == groupPosition;
            accordion.isExpanded = _isExpanded;
            viewHolderAccordion.groupExpander.setImageResource(_isExpanded ? R.drawable.expander_white_close : R.drawable.expander_open);
            viewHolderAccordion.contentView.setActivated(_isExpanded ? true : false);
            viewHolderAccordion.dashboard_product_accordion_divider.setVisibility(_isExpanded ? View.GONE : View.VISIBLE);
        }
        convertView.setTag(viewHolderAccordion);
    }


    return convertView;
}

private void deleteCell(final View view, final int groupPosition) {
    final Animation.AnimationListener animationListener = new Animation.AnimationListener() {
        @Override
        public void onAnimationEnd(Animation arg0) {
            dashboard.remove(groupPosition);
            notifyDataSetInvalidated();
            notifyDataSetChanged();


        }

        @Override
        public void onAnimationRepeat(Animation animation) {
        }

        @Override
        public void onAnimationStart(Animation animation) {
        }
    };

    collapse(view, animationListener);
}

private void collapse(final View view, final Animation.AnimationListener al) {
    final int initialHeight = view.getMeasuredHeight();

    Animation anim = new Animation() {
        @Override
        protected void applyTransformation(float interpolatedTime, Transformation t) {
            if (interpolatedTime == 1) {
                view.setVisibility(View.GONE);
            } else {
                view.getLayoutParams().height = initialHeight - (int) (initialHeight * interpolatedTime);
                view.requestLayout();
            }
        }

        @Override
        public boolean willChangeBounds() {
            return true;
        }
    };

    if (al != null) {
        anim.setAnimationListener(al);
    }
    anim.setDuration(200);
    view.startAnimation(anim);
}

@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
    if (getGroupType(groupPosition) == GroupType.PRODUCT_ACCORDION.ordinal()) {

        final Dashboard.Products.Accordion.Action action =
                (Dashboard.Products.Accordion.Action) getChild(groupPosition, childPosition);
        if (action != null) {
            ViewHolderAccordionLink viewHolderAccordionLink;
            if (convertView == null) {
                LayoutInflater inflater = activity.getLayoutInflater();
                convertView = inflater.inflate(R.layout.item_dashboard_accordion_link, parent, false);
                viewHolderAccordionLink = new ViewHolderAccordionLink(convertView);
            } else {
                viewHolderAccordionLink = ((ViewHolderAccordionLink) convertView.getTag()).reset();
            }

            // populate view with content
            if (viewHolderAccordionLink != null) {
                if (Verify.notNull(action.icon)) {
                    viewHolderAccordionLink.ivAccordionLink.setVisibility(View.VISIBLE);
                } else {
                    viewHolderAccordionLink.ivAccordionLink.setVisibility(View.GONE);
                }
                if (action.title != null) {
                    setText(viewHolderAccordionLink.tvAccordionLinkLabel, action.title);
                }

                convertView.setTag(viewHolderAccordionLink);
            }
        }

    }
    return convertView;
}

@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
    return getChildrenCount(groupPosition) > 0;
}

@Override
public boolean areAllItemsEnabled() {
    return false;
}

@Override
public boolean isEmpty() {
    return dashboard.size() == 0;
}

@Override
public void onGroupExpanded(int groupPosition) {
}

@Override
public void onGroupCollapsed(int groupPosition) {

}

private void setText(final TextView textView, final DashboardText text) {
    if (text != null) {
        textView.setVisibility(View.VISIBLE);
        if (Verify.notNull(text.text)) {
            textView.setText(Html.fromHtml(text.text));
        }
        switch (text.color) {
            case BLACK:
                textView.setTextColor(activity.getResources().getColorStateList(R.color.selector_dashboard_black));
                break;
            case ORANGE:
                textView.setTextColor(activity.getResources().getColorStateList(R.color.selector_dashboard_orange));
                break;
            case RED:
                textView.setTextColor(activity.getResources().getColorStateList(R.color.selector_dashboard_red));
                break;
            case GREEN:
                textView.setTextColor(activity.getResources().getColorStateList(R.color.selector_dashboard_green));
                break;
            case GREY:
                textView.setTextColor(activity.getResources().getColorStateList(R.color.selector_dashboard_grey));
                break;
            case WHITE:
                textView.setTextColor(activity.getResources().getColor(R.color.white));
                break;
        }
    } else {
        textView.setVisibility(View.GONE);
    }
}

public String getIbanAtPosition(int groupPosition) {

    if (getGroupType(groupPosition) == GroupType.PRODUCT_ACCORDION.ordinal()) {
        final Dashboard.Products.Accordion group = (Dashboard.Products.Accordion) getGroup(groupPosition);

        if (group != null) {
            return group.detail.text;
        }
    }

    return null;

}

public int getPositionFromIban(String iban) {
    if (dashboard != null) {
        for (int groupPosition = 0; groupPosition < dashboard.size(); groupPosition++) {
            if (getGroupType(groupPosition) == GroupType.PRODUCT_ACCORDION.ordinal()) {
                Dashboard.Products.Accordion group = (Dashboard.Products.Accordion) getGroup(groupPosition);
                if (group.detail.text.equalsIgnoreCase(iban))
                    return groupPosition;
            }
        }
    }
    return -1;
}

public void setLastExpandedProductIban(String lastExpandedProductIban) {
    this.lastExpandedProductIban = lastExpandedProductIban;
}

private enum GroupType {
    PERSONALIZATION, PRODUCT_ACCORDION;

    // Converts from an ordinal value to the Groups
    public static GroupType valueOf(final int index) {
        final GroupType[] values = GroupType.values();
        if (index < 0 || index >= values.length) {
            return PERSONALIZATION;
        }
        return values[index];
    }
}



class ViewHolderAccordion {
    public View contentView;
    public ImageView groupExpander;
    public TextView tvProductAccordionName;
    public TextView tvProductAccordionDetail;
    public TextView tvProductAccordionBalance;
    public View dashboard_product_accordion_divider;

    public ViewHolderAccordion(View contentView) {
        this.contentView = contentView;
        groupExpander = (ImageView) contentView.findViewById(R.id.groupExpander);
        tvProductAccordionName = (TextView) contentView.findViewById(R.id.tvProductAccordionName);
        tvProductAccordionDetail = (TextView) contentView.findViewById(R.id.tvProductAccordionDetail);
        tvProductAccordionBalance = (TextView) contentView.findViewById(R.id.tvProductAccordionBalance);
        dashboard_product_accordion_divider = contentView.findViewById(R.id.dashboard_product_accordion_divider);
    }

    public ViewHolderAccordion reset() {
        //contentView.setBackgroundColor(0xFFffffff);
        tvProductAccordionName.setText("");
        tvProductAccordionDetail.setText("");
        tvProductAccordionDetail.setVisibility(View.VISIBLE);
        tvProductAccordionBalance.setText("");
        return this;
    }
}}

Answer 1

我可以使用

解决这个问题

@Override
public long getGroupId(int groupPosition) {
    return dashboard.get(groupPosition).hashCode();
}

而不是

@Override
public long getGroupId(int groupPosition) {
    return groupPosition;
}

从列表中删除项目后，扩展项目的位置不会在 ExpandableListView 上刷新 - Android？

After deleting an item from list, expanded item's position does not refresh on ExpandableListView - Android?

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