取消选择并向下滚动后，列表视图中的复选框被选中。

Question

我知道有人提出了多个与我的问题类似的问题，但尚未解决我的特定问题。

我有一个 BaseAdapter，它准备了一个带有复选框的列表。

这里是适配器的相关代码——

 @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        selectedFolderIds = new ArrayList<>();
        selectedFolderNames = new ArrayList<>();
        selectedFolderParentIds = new ArrayList<>();
        deselectedFolderIds = new ArrayList<>();

        final FolderStructureDataModel folderDetails = (FolderStructureDataModel) getItem(position);

        final ViewHolder holder;
        LayoutInflater inflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        if(convertView == null) {
            convertView = inflater.inflate(R.layout.folder_structure_list_item_template,
                    parent, false);
            holder = new ViewHolder();
            holder.folderListLayout = (RelativeLayout) convertView.findViewById(R.id.folder_list_layout);
            holder.childFoldersIndicator = (ImageView)
                    convertView.findViewById(R.id.child_folders_indicator);
            holder.selectionCheckBox = (CheckBox) convertView.findViewById(R.id.checkbox);

            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
            holder.selectionCheckBox.setOnCheckedChangeListener(null);
            holder.selectionCheckBox.setOnClickListener(null);
        }

        /**
         * Attach the listeners to the checkboxes.
         */
        holder.selectionCheckBox.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                CheckBox cb = (CheckBox) view;
                if (cb.isChecked()) {
                    selectedFolderIds.add(HelperFunctions.EncodeString(folderDetails.ID));
                    selectedFolderNames.add(HelperFunctions.EncodeString(folderDetails.DisplayName));
                    selectedFolderParentIds.add(HelperFunctions.EncodeString(folderDetails.ParentFolderID));

                    SelectedFolderListener selectedFolderListener =
                            (SelectedFolderListener) context;
                    selectedFolderListener.getSelectedFoldersArrayList(selectedFolderIds,
                            selectedFolderNames, selectedFolderParentIds);

                    Log.i("Test : " + folderDetails.DisplayName + " at position " +
                            String.valueOf(position), "Set to " +
                            String.valueOf(checkboxStatus.get(position))
                            + " From onClickListener");
                } else {
                    selectedFolderIds.remove(HelperFunctions.EncodeString(folderDetails.ID));
                    selectedFolderNames.remove(HelperFunctions
                            .EncodeString(folderDetails.DisplayName));
                    selectedFolderParentIds.remove(HelperFunctions
                            .EncodeString(folderDetails.ParentFolderID));
                    deselectedFolderIds.add(HelperFunctions.EncodeString(folderDetails.ID));

                    UnselectedFolderListener unselectedFolderListener =
                            (UnselectedFolderListener) context;
                    unselectedFolderListener.getDeselectedFolderArrayList(deselectedFolderIds);

                    Log.i("Test : " + folderDetails.DisplayName + " at position " +
                            String.valueOf(position), "Set to " +
                            String.valueOf(checkboxStatus.get(position))
                            + " From onClickListener");
                }
            }
        });

        holder.selectionCheckBox.setOnCheckedChangeListener
                (new CompoundButton.OnCheckedChangeListener() {

                    @Override
                    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

                        if (((buttonView).isChecked()) && isChecked) {
                            checkboxStatus.set(position, true);
                            Log.i("Test : " + folderDetails.DisplayName + " at position " +
                                    String.valueOf(position), "Set to " +
                                    String.valueOf(checkboxStatus.get(position))
                                    + " From onCheckChangedListener");
                        } else {
                            checkboxStatus.set(position, false);
                            Log.i("Test : " + folderDetails.DisplayName + " at position " +
                                    String.valueOf(position), "Set to " +
                                    String.valueOf(checkboxStatus.get(position))
                                    + " From onCheckChangedListener");
                        }
                    }
                });

        //Populate the data
        holder.selectionCheckBox.setText(String.valueOf(folderDetails.DisplayName));

        if(Integer.valueOf(folderDetails.ChildFolderCount) == 0) {
            holder.childFoldersIndicator.setVisibility(View.GONE);
            holder.folderListLayout.setFocusable(true);
            holder.folderListLayout.setClickable(true);
        } else {
            holder.childFoldersIndicator.setVisibility(View.VISIBLE);
            holder.folderListLayout.setFocusable(false);
            holder.folderListLayout.setClickable(false);
        }

        /**
         * Set the checkbox as per the service reply (status in the server)
         */
        if(Boolean.valueOf(folderDetails.IsAlreadySelected)) {
            holder.selectionCheckBox.setChecked(true);
            Log.i("Test : " + folderDetails.DisplayName + " at position " +
                    String.valueOf(position), "Set to " +
                    String.valueOf(holder.selectionCheckBox.isChecked()) + " From folderDetails");
        } else {
            holder.selectionCheckBox.setChecked(false);
            Log.i("Test : " + folderDetails.DisplayName + " at position " +
                    String.valueOf(position), "Set to " +
                    String.valueOf(holder.selectionCheckBox.isChecked()) + " From folderDetails");
        }

        /**
         * Set the checkbox as per the values maintained in the checkboxStatus ArrayList
         */
        if(checkboxStatus.get(position)) {
            holder.selectionCheckBox.setChecked(true);
            Log.i("Test : " + folderDetails.DisplayName + " at position " +
                    String.valueOf(position), "Set to " +
                    String.valueOf(holder.selectionCheckBox.isChecked()) + " From checkBoxStatus");
        } else {
            holder.selectionCheckBox.setChecked(false);
            Log.i("Test : " + folderDetails.DisplayName + " at position " +
                    String.valueOf(position), "Set to " +
                    String.valueOf(holder.selectionCheckBox.isChecked()) + " From checkBoxStatus");
        }

        return convertView;
    }

我有一个ArrayListcheckboxStatus，它维护每个位置复选框的状态。

我面临的问题是，如果一个复选框已被选中（根据“folderDetails.IsAlreadySelected”的值），我取消选中它并向下滚动然后向上滚动，该复选框将再次被选中。特殊的部分是在相反的情况下不会发生这种情况 - 如果未选中复选框，我选中它并向下滚动然后再次向上滚动；状态保持为选中状态。

适配器可能有什么问题？

Answer 1

要解决您的问题，请执行以下操作：

if(convertView == null) {
        convertView = inflater.inflate(R.layout.folder_structure_list_item_template,
                parent, false);
        holder = new ViewHolder();
        holder.folderListLayout = (RelativeLayout) convertView.findViewById(R.id.folder_list_layout);
        holder.childFoldersIndicator = (ImageView)
                convertView.findViewById(R.id.child_folders_indicator);
        holder.selectionCheckBox = (CheckBox) convertView.findViewById(R.id.checkbox);
  // Add this line, set tag on your checkbox.
 holder.selectionCheckBox .setTag(holder);
        convertView.setTag(holder);
    }

现在在 clicklistner 上，

 holder.selectionCheckBox.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
         // add this line,declare holder_new as an instance of ViewHolder
        holder_new= (ViewHolder) view.getTag();
            // rest is your code what you have already written
    });

现在在 onclick 之后，无论您使用 holder 访问 selectionCheckBox 的任何位置，都将其更改为 holder_new。

holder.selectionCheckBox.setChecked(true); 将其更改为 holder_new.selectionCheckBox.setChecked(true);