Question

我有一个带有名单和复选框列表的recyclerview。当我通过检查列表中的一些项目滚动列表时，复选框的位置会发生变化。试图摆脱它。有人可以帮忙吗？

我有单独的模型和适配器类，我对recyclelerview的父视图是一个活动顶部的片段。

我也可以提供代码供参考。

谢谢！

Fragment.java

recyclerView = (RecyclerView) getView().findViewById(R.id.my_recycler_view2);
        recyclerView.setHasFixedSize(true);
        LinearLayoutManager llm = new LinearLayoutManager(getActivity());
        llm.setOrientation(LinearLayoutManager.VERTICAL);
        recyclerView.setLayoutManager(llm);


        try{
            data = new JSONObject(MainActivity.responseobject);
            //data.getJSONArray("Children");
            demoData = new ArrayList<Model>();
            for(int i=0;i<data.getJSONArray("Children").length();i++)
            {
                Model model = new Model();
                model.name = data.getJSONArray("Children").getJSONObject(i).getJSONObject("Child").getString("childName");
                model.zone = data.getJSONArray("Children").getJSONObject(i).getJSONObject("Child").getString("Zone");
                model.latitude = data.getJSONArray("Children").getJSONObject(i).getJSONObject("Child").getString("childLat");
                model.longitude= data.getJSONArray("Children").getJSONObject(i).getJSONObject("Child").getString("childLon");
                model.isChecked=MainActivity.checkedall?true:false;
                model.studentid = data.getJSONArray("Children").getJSONObject(i).getJSONObject("Child").getString("ParentID");
                demoData.add(model);
            }

            adapter = new RecyclerViewAdapterMessage(demoData,getActivity());
            recyclerView.setAdapter(adapter);

        }
        catch (Exception e){
            e.printStackTrace();
        }

Adapter.java

@Override
    public ListItemViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
        View itemView = LayoutInflater.from(viewGroup.getContext()).
                inflate(R.layout.recyclerview_messageitem, viewGroup, false);

        return new ListItemViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(final ListItemViewHolder viewHolder, int position) {

        final Model model = items.get(position);
        viewHolder.name.setText(String.valueOf(model.name));
        //viewHolder.itemView.setActivated(model.isChecked);
        viewHolder.select.setActivated(viewHolder.checkboxstate);
        viewHolder.checkboxstate = false;
        System.out.println(selectedItems.toString());
        viewHolder.select.setTag(model);
        if (MainActivity.checkedall) {
            for (int i = 0; i < items.size(); i++) {
                if (MainActivity.checkedall) {
                    viewHolder.select.setActivated(viewHolder.checkboxstate);
                    System.out.println("ALL CHECKED INSIDE AVA");
                }
            }
        }

        viewHolder.select.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                CheckBox cb = (CheckBox) v;
                Model contact = (Model) cb.getTag();
                contact.isChecked = true;
               /* if(){

                }else{

                }*/
                if(cb.isChecked()){
                    TwoFragment.sid=TwoFragment.sid+","+contact.studentid;
                    //contact.studentid = contact.studentid;
                    //notifyDataSetChanged();
                    Toast.makeText(v.getContext(), "Clicked on Checkbox: " + contact.name + " is " + cb.isChecked() +"    "+contact.studentid, Toast.LENGTH_LONG).show();
                 }
                }
        });
        //model.studentid




    }
    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public int getItemCount() {
        return items.size();
    }
    public Model getItem(int position){
        return items.get(position);
    }

    public final static class ListItemViewHolder extends RecyclerView.ViewHolder {
        TextView name;
        CheckBox select;
        boolean checkboxstate;

        public ListItemViewHolder(View itemView) {
            super(itemView);
            name = (TextView) itemView.findViewById(R.id.person_name);
            select=(CheckBox) itemView.findViewById(R.id.person_zone);
        }
    }
    public List<Model> getStudentist() {
        return items;
    }

我已经为片段类和适配器类提供了代码。

Answer 1

我无法理解为什么你在onBindViewHolder中这样做。

if (MainActivity.checkedall) {
        for (int i = 0; i < items.size(); i++) {
            if (MainActivity.checkedall) {
                viewHolder.select.setActivated(viewHolder.checkboxstate);
                System.out.println("ALL CHECKED INSIDE AVA");
            }
        }
    }

点击选择所有视图，将model.isChecked此值更改为true，然后调用adapter.notifyDataSetChanged();。在ViewHolder中也不需要这个checkboxstate

然后选中复选框

viewHolder.select.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            // Just Do this
            model.isChecked = viewHolder.select.isChecked();

            if(viewHolder.select.isChecked()){
                TwoFragment.sid=TwoFragment.sid+","+contact.studentid;

                Toast.makeText(v.getContext(), "Clicked on Checkbox: " + model.name + " is " + viewHolder.select.isChecked() +"    "+model.studentid, Toast.LENGTH_LONG).show();
             }
            }
    });

最后

if(model.isChecked)
    viewHolder.select.setChecked(true);
else
    viewHolder.select.setChecked(false)

带有复选框的Recyclerview会更改滚动

1 个答案: