滚动时，在recyclerView中取消选中复选框 [英] checkboxes gets unchecked in recyclerView upon scrolling

问题描述

我有一个光标，它检索成分列表并填充适配器，然后将其分配给具有复选框的回收站视图。我得到的问题是，当我检查一组复选框并向下滚动时，从顶部选择的那些，取消选择，反之亦然，或者在某些情况下，如果我从顶部选择三个，从底部选择三个被选中。我需要确保，最初没有选择任何内容，即使我上下滚动，所选内容也应该保持选中状态并需要跟踪。

I have a cursor which retrieves a list of ingredients and populates an adapter, which is then assigned to a recycler View having checkboxes. The problem I've got is that, when I check a set of checkboxes and scroll down, the ones selected from the top, get deselected and vice versa, or in some instances, if I select three from the top, three from the bottom get selected. I need to make sure that, initially nothing is selected, and even if I scroll up and down, the ones selected should remain selected and need to keep track of.

这里是可以scrolable的列表。

Here is the list which is scrolable.

这是我的代码：

class RecipeDetailCursorAdapter extends CursorRecyclerViewAdapter<RecyclerView.ViewHolder> {

    private int mBrownColor;
    private int mGreenColor;
    private int mCheckItems;
    private ItemsCheckedCallback mCheckedCallback;

    RecipeDetailCursorAdapter(Context context, Cursor cursor, ItemsCheckedCallback callback) {
        super(context, cursor);
        mCheckedCallback = callback;
        mBrownColor = ContextCompat.getColor(mContext, R.color.colorTextBrown);
        mGreenColor = ContextCompat.getColor(mContext, R.color.colorTextGreen);
        mCheckItems = 0;
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, Cursor cursor) {
        String taskName = cursor.getString(cursor.getColumnIndexOrThrow(MascotHelper.RecipeTask.NAME));
        ((RecipeTaskHolder) viewHolder).bindView(taskName);
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.recipe_task_item, parent, false);
        return new RecipeTaskHolder(v);
    }


    private class RecipeTaskHolder extends RecyclerView.ViewHolder
            implements SmoothCheckBox.OnCheckedChangeListener {

        SmoothCheckBox taskBox;
        TextView recipeComponentName;


        RecipeTaskHolder(View v) {
            super(v);
            taskBox = (SmoothCheckBox) v.findViewById(R.id.recipe_task_box);
            recipeComponentName = (TextView) v.findViewById(R.id.recipe_component_name);
            taskBox.setOnCheckedChangeListener(this);
        }


        void bindView(String task) {
            recipeComponentName.setText(task);
        }

        @Override
        public void onCheckedChanged(SmoothCheckBox smoothCheckBox, boolean b) {
            if (smoothCheckBox.isChecked()) {
                recipeComponentName.setTextColor(mBrownColor);
                mCheckItems++;
            } else {
                recipeComponentName.setTextColor(mGreenColor);
                mCheckItems--;
            }


            if (mCheckItems == getItemCount()) {
                //Toast.makeText(mContext, "All items are checked", Toast.LENGTH_SHORT).show();
                mCheckedCallback.onAllItemChecked(true);
            } else {
                mCheckedCallback.onAllItemChecked(false);
            }
        }
    }


    interface ItemsCheckedCallback {
        void onAllItemChecked(boolean status);
    }
}

任何想法或建议都将不胜感激。

Any ideas or suggestions would be appreciated.

推荐答案

在onBindView上使用以下逻辑：

use logic below on onBindView:

holder.attenCheckBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
                if (holder.attenCheckBox.isChecked())
                    dataModel.setChecked(true);
                else
                    dataModel.setChecked(false);
            }
        });

        if (dataModel.getChecked())
            holder.attenCheckBox.setChecked(true);
        else
            holder.attenCheckBox.setChecked(false);
        holder.checkboxLinearLayout.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                if (holder.attenCheckBox.isChecked())
                    holder.attenCheckBox.setChecked(false);
                else
                    holder.attenCheckBox.setChecked(true);


            }
        });

说明：

• 向下或向上滚动时，回收查看会延长eveytime。


• 您需要在数据pojo中存储标记以跟踪检查状态


• 将该标志与 setOnCheckedChangeListener 一起使用，可以让你检查启用/禁用。确保你把旗帜放在后面听众。

• Recycle view inflate eveytime when you scroll down or up.
• you need to store a flag in the data pojo to keep track of check status
• using that flag with setOnCheckedChangeListener will enable you to have you checked enable/disable .make sure you put flag after listener.

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