Question

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

到目前为止，我可以点击群组查看孩子，我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，如果我长按对某个组进行选择，则会显示一个上下文操作栏。如果我选择删除按钮，则删除该项目。都好。

但是，当我尝试在CAB模式下选择多个组时，会出现问题。它只是不起作用。如果我单击第二个组，则该组将展开（未选中）。我希望能够突出显示多个组项而不进行任何扩展。

有很多代码可以让它工作，但我会尝试展示一些相关的部分。主要问题是获取所选组项的列表。其次，我不希望这些组在被选中时被扩展（虽然CAB是可见的 - 这是我试图通过保持mActionMode中的ActionMode）。

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

虽然这是一篇很老的帖子，但如果有人偶然发现，我会发布一个答案。问题是ExpandableListView不支持ChoiceMode。虽然它似乎有效，你可以手动调用ExpandableListView来设置检查项目...它永远不会完全正常工作。为了更深入的原因，为什么;请参阅this和this SO回答。

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，建议您使用PatchedExpandabeListAdapter。你可以阅读它here。基本上它补丁并改进了一些东西......其中一个是由OP提出的ChoiceMode问题。

如果你不想推出自己的解决方案，那么找到两个很好的完全成熟的Rolodex适配器here来实现PatchedExpandabeListAdapter以及除视图生成之外你需要的大部分内容。

当Contextual Action Bar可见时，停止ExpandableListView组扩展

1 个答案: