在上下文操作栏可见时停止 ExpandableListView 组扩展

Question

我有一个包含ExpandableListView 的片段。我希望能够按 group 选择和删除项目。我还希望能够通过上下文操作栏选择多个组项进行删除。

到目前为止，我可以点击组查看孩子，也可以点击孩子去另一个活动。我将ExpandableListView 的选择模式设置为CHOICE_MODE_MULTIPLE_MODAL，如果我长按一个组，它被选中，就会出现一个上下文操作栏。如果我选择我的删除按钮，该项目将被删除。都好。

但是，当我尝试在 CAB 模式中选择 多个 组时，就会出现问题。它只是行不通。如果我单击第二个组，则会展开该组（未选中）。我希望能够仅突出显示多个组项而不会发生任何扩展。

有很多代码可以让这个工作，但我会尝试展示一些相关的部分。主要问题是获取选定组项目的列表。其次，我不希望在选择组时扩展组（虽然 CAB 是可见的 - 这是我通过在 mActionMode 中保持 ActionMode 所尝试的）。

非常感谢任何帮助。

ex.setMultiChoiceModeListener(new AbsListView.MultiChoiceModeListener() {
        @Override
        public void onItemCheckedStateChanged(ActionMode actionMode, int position, long id, boolean checked) {
            // Ignore long clicks on children
            long pos = ex.getExpandableListPosition(position);
            if (checked && (ExpandableListView.getPackedPositionType(pos) == ExpandableListView.PACKED_POSITION_TYPE_CHILD)) {
                ex.setItemChecked(position, false);
                return;
            }
        }

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

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

        @Override
        public boolean onActionItemClicked(ActionMode actionMode, MenuItem item) {
            // If delete is clicked, delete the measurement set
            switch(item.getItemId()) {
                case(R.id.context_menu_delete_item):
                    Set<mySet> setsToDelete = new HashSet<mySet>();

                    if (ex != null) {
                        if (ex.getCheckedItemCount() > 0) {
                            SparseBooleanArray checkedPositions = ex.getCheckedItemPositions();
                            for (int i = 0; i < checkedPositions.size(); i++) {
                                int position = checkedPositions.keyAt(i);

                                /* Ignore selected children */
                                long pos = ex.getExpandableListPosition(position);
                                int groupPosition = ExpandableListView.getPackedPositionGroup(pos);


                                if (checkedPositions.valueAt(i)) {
                                    Log.d(TAG, "Adding MeasurementSet at position Key = " + position + " to deletion list");
                                    setsToDelete.add(mSets.get(groupPosition));
                                }

                            }
                        }
                    }

                    try {
                        if (ex != null && setsToDelete.size() > 0) {

                            ArrayList setsToDeleteList = new ArrayList(setsToDelete);
                            deleteSets(setsToDeleteList);

                            for (mySet s : setsToDelete) {
                                mSets.remove(s);
                            }

                            Toast.makeText(getActivity(), "Set deleted successfully", Toast.LENGTH_LONG).show();


                        }
                    } catch (SQLiteException sqlex) {
                        Log.e(TAG, "Delete operation failed");
                        Log.e(TAG, "Error was: " + sqlex.getMessage());
                        Log.e(TAG, "Stack trace: " + sqlex.getStackTrace());
                        Toast.makeText(getActivity(), "There was an error whilst deleting Set(s): " + sqlex.getMessage(), Toast.LENGTH_LONG).show();
                    }

                    actionMode.finish();
                    return true;
                default:
                    return false;
            }
        }

        @Override
        public void onDestroyActionMode(ActionMode actionMode) {
            mActionMode = null;
        }
    });

    ex.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
        @Override
        public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
            Long mId = mSets.get(groupPosition).getMyList().get(childPosition).getId();
            Intent intent = new Intent(getActivity(), ViewSingleActivity.class);
            intent.putExtra(getResources().getString(R.string.EXTRA_MID_KEY), measurementId);
            startActivityForResult(intent, Constants.REQ_VIEW_M);
            return true;
        }
    });

// Here I was trying to intercept group clicks and force the clicked group to collapse. Although this doesn't seem to solve the issue of having the group "selected"
    ex.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
        @Override
        public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {
            if (mActionMode != null) {
                Log.d(TAG, "mActionMode is not null. Setting View: " + parent.toString() + " to be selected");
                v.setSelected(true);
                Log.d(TAG, "Collapsing group " + groupPosition);
                parent.collapseGroup(groupPosition);
            }
            return false;
        }
    });
}

Answer 1

虽然这是一篇旧帖子，但我想如果有人偶然发现我会发布答案。问题是ExpandableListView 不支持ChoiceMode。虽然它似乎可以正常工作，但您可以手动调用ExpandableListView 来设置检查项目......它永远不会完全正常工作。对于原因的更深入的原因；请参阅this 和this SO 答案。

OP 没有说明他们是否编写了自己的自定义适配器。所以我将解决这两种方法。

如果您想编写自己的自定义ExpandableListAdapter，我建议使用PatchedExpandabeListAdapter。你可以阅读它here。基本上它修补和改进了一些东西......其中之一是 OP 提出的 ChoiceMode 问题。

如果您不想推出自己的解决方案，可以找到两个不错的成熟 Rolodex 适配器 here，它实现了 PatchedExpandabeListAdapter 以及除了视图生成之外您需要的大部分内容。