java - 从fragment添加到recyclerview并从recyclerview内部删除recyclerview

Question

大家好，我有一个 fragment ，我可以毫无问题地将所有元素添加到回收器 View 中。然后，如果我从回收器 View 中删除一切都很好。但是在我删除某些内容后，我从适配器列表中删除的项目似乎并未从我传递到适配器中的 fragment 列表中删除，因为如果我添加其他内容，所有已删除的项目都会返回到回收器 View 中。我已经记录了列表的大小，这是正确的，只是如果我在向回收器添加 1 个元素时删除一个或多个项目，它会添加所有其他已删除的元素，但似乎它只算作一个，因为如果我点击删除任何旧的，它们都再次消失，我已经这样做了一段时间，但找不到解决方案，谢谢您的时间

这是 fragment 中的相关代码

 public void instantiateViews(){
        View power1 = (View)getView().findViewById(R.id.include);
        View mega1 = (View)getView().findViewById(R.id.include1);
        powerBall = (TextView)power1.findViewById(R.id.win);
        megaMillions = (TextView)mega1.findViewById(R.id.winm);
        power = (RecyclerView)getView().findViewById(R.id.powerRecycle);
        mega = (RecyclerView)getView().findViewById(R.id.megaRecycle);
    }
    public void getMyTickets(){
        powerNumbers = SharedPrefHelper.getMyTickets(getActivity(),"powerball");
        megaNumbers = SharedPrefHelper.getMyTickets(getActivity(),"megamillions");
    }
    public void setMyTickets(){
        SharedPrefHelper.setMyTickets(getActivity(),powerNumbers,"powerball");
        SharedPrefHelper.setMyTickets(getActivity(),megaNumbers,"megamillions");
    }
    public void populateRecyclerViews(){
        //power.setHasFixedSize(true);
        LinearLayoutManager llm = new LinearLayoutManager(getActivity());
        power.setLayoutManager(llm);
        powerAdapter = new MyTicketAdapter(powerNumbers,"powerball");
        power.setAdapter(powerAdapter);

        //mega.setHasFixedSize(true);
        LinearLayoutManager llm1 = new LinearLayoutManager(getActivity());
        mega.setLayoutManager(llm1);
        megaAdapter = new MyTicketAdapter(megaNumbers,"megamillions");
        mega.setAdapter(megaAdapter);
    }
    public void setClickListeners(){
        powerBall.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                final AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(getActivity());
// ...Irrelevant code for customizing the buttons and title
                LayoutInflater inflater = getActivity().getLayoutInflater();
                final View dialogView = inflater.inflate(R.layout.ticket_selector, null);
                final NumberPicker one = (NumberPicker)dialogView.findViewById(R.id.one);
                one.setMinValue(1);
                one.setMaxValue(69);
                final NumberPicker two = (NumberPicker)dialogView.findViewById(R.id.two);
                two.setMinValue(1);
                two.setMaxValue(69);
                final NumberPicker three = (NumberPicker)dialogView.findViewById(R.id.three);
                three.setMinValue(1);
                three.setMaxValue(69);
                final NumberPicker four = (NumberPicker)dialogView.findViewById(R.id.four);
                four.setMinValue(1);
                four.setMaxValue(69);
                final NumberPicker five = (NumberPicker)dialogView.findViewById(R.id.five);
                five.setMinValue(1);
                five.setMaxValue(69);
                final NumberPicker six = (NumberPicker)dialogView.findViewById(R.id.six);
                six.setMinValue(1);
                six.setMaxValue(26);
                final RadioGroup group = (RadioGroup)dialogView.findViewById(R.id.group);

                dialogBuilder.setView(dialogView);




                final AlertDialog alertDialog = dialogBuilder.create();
                alertDialog.setButton(AlertDialog.BUTTON_NEGATIVE, "Cancel", null, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        alertDialog.dismiss();
                    }
                });
                alertDialog.setButton(AlertDialog.BUTTON_POSITIVE, "Add", null, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        //powerNumbers = SharedPrefHelper.getMyTickets(getActivity(),"powerball");
                        //powerNumbers = powerAdapter.mDataset;
                        String ticket = one.getValue() + " " + two.getValue() + " " + three.getValue() +
                                " " + four.getValue() + " " + five.getValue() + " " + six.getValue();
                        int mul = group.getCheckedRadioButtonId();
                        RadioButton but = dialogView.findViewById(mul);
                        String multi = but.getText().toString();
                        MyTicket ticket1 = new MyTicket();
                        ticket1.ticket = ticket;
                        ticket1.multi = multi;
                        powerNumbers.add(ticket1);
                        Log.d("adapter",powerNumbers.size()+"");
                        powerAdapter.notifyItemInserted(powerNumbers.size() - 1);
                        SharedPrefHelper.setMyTickets(getActivity(),powerNumbers,"powerball");
                        alertDialog.dismiss();

                    }
                });
                alertDialog.show();
            }
        });
        megaMillions.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                final AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(getActivity());
// ...Irrelevant code for customizing the buttons and title
                LayoutInflater inflater = getActivity().getLayoutInflater();
                final View dialogView = inflater.inflate(R.layout.ticket_selector, null);
                final NumberPicker one = (NumberPicker)dialogView.findViewById(R.id.one);
                one.setMinValue(1);
                one.setMaxValue(69);
                final NumberPicker two = (NumberPicker)dialogView.findViewById(R.id.two);
                two.setMinValue(1);
                two.setMaxValue(69);
                final NumberPicker three = (NumberPicker)dialogView.findViewById(R.id.three);
                three.setMinValue(1);
                three.setMaxValue(69);
                final NumberPicker four = (NumberPicker)dialogView.findViewById(R.id.four);
                four.setMinValue(1);
                four.setMaxValue(69);
                final NumberPicker five = (NumberPicker)dialogView.findViewById(R.id.five);
                five.setMinValue(1);
                five.setMaxValue(69);
                final NumberPicker six = (NumberPicker)dialogView.findViewById(R.id.six);
                six.setMinValue(1);
                six.setMaxValue(26);
                six.setBackgroundColor(Color.YELLOW);
                final RadioGroup group = (RadioGroup)dialogView.findViewById(R.id.group);

                dialogBuilder.setView(dialogView);




                final AlertDialog alertDialog = dialogBuilder.create();
                alertDialog.setButton(AlertDialog.BUTTON_NEGATIVE, "Cancel", null, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        alertDialog.dismiss();
                    }
                });
                alertDialog.setButton(AlertDialog.BUTTON_POSITIVE, "Add", null, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        //megaNumbers.clear();
                        //megaNumbers = SharedPrefHelper.getMyTickets(getActivity(),"megamillions");
                       // megaNumbers = new ArrayList<MyTicket>(megaAdapter.mDataset);
                        String ticket = one.getValue() + " " + two.getValue() + " " + three.getValue() +
                                " " + four.getValue() + " " + five.getValue() + " " + six.getValue();
                        int mul = group.getCheckedRadioButtonId();
                        RadioButton but = dialogView.findViewById(mul);
                        String multi = but.getText().toString();
                        MyTicket ticket1 = new MyTicket();
                        ticket1.ticket = ticket;
                        ticket1.multi = multi;
                        megaNumbers.add(ticket1);
                        megaAdapter.notifyItemInserted(megaNumbers.size() - 1);
                        //megaAdapter.notifyDataSetChanged();
                        SharedPrefHelper.setMyTickets(getActivity(),megaNumbers,"megamillions");
                        alertDialog.dismiss();

                    }
                });
                alertDialog.show();
            }
        });
    }

这是我的整个 recyclerview 适配器

public class MyTicketAdapter extends RecyclerView.Adapter<MyTicketAdapter.MyViewHolder> {
    public ArrayList<MyTicket> mDataset;
    private String type;


    // Provide a reference to the views for each data item
    // Complex data items may need more than one view per item, and
    // you provide access to all the views for a data item in a view holder
    public static class MyViewHolder extends RecyclerView.ViewHolder {
        // each data item is just a string in this case
        CardView cv;
        LinearLayout linear;
        Context context;
        public MyViewHolder(View itemView, Context context) {
            super(itemView);
            cv = (CardView) itemView.findViewById(R.id.cv);
            linear = (LinearLayout) itemView.findViewById(R.id.linear);
            this.context = context;
        }
    }

    // Provide a suitable constructor (depends on the kind of dataset)
    public MyTicketAdapter(ArrayList<MyTicket> myDataset, String type) {
        mDataset = myDataset;
        this.type = type;

    }

    // Create new views (invoked by the layout manager)
    @Override
    public MyTicketAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent,
                                                     int viewType) {
        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.cardview, parent, false);
        MyViewHolder vh = new MyViewHolder(v,parent.getContext());
        return vh;
    }

    // Replace the contents of a view (invoked by the layout manager)
    @Override
    public void onBindViewHolder(final MyViewHolder holder, final int position) {
        if(type.equals("powerball")){
            final View view;
            LayoutInflater inflater = (LayoutInflater)   holder.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            view = inflater.inflate(R.layout.balls, null);
            TextView ball1 = (TextView) view.findViewById(R.id.ball1);
            TextView ball2 = (TextView) view.findViewById(R.id.ball2);
            TextView ball3 = (TextView) view.findViewById(R.id.ball3);
            TextView ball4 = (TextView) view.findViewById(R.id.ball4);
            TextView ball5 = (TextView) view.findViewById(R.id.ball5);
            TextView ball6 = (TextView) view.findViewById(R.id.ball6);
            TextView multi = (TextView) view.findViewById(R.id.multi);
            multi.setText("Multiplier: " + mDataset.get(position).multi);
            TextView win = (TextView)view.findViewById(R.id.win);
            win.setText(holder.context.getResources().getString(R.string.remove));

            TextView[] images = {ball1,ball2,ball3,ball4,ball5,ball6};
            //String num = mDataset.get(position).ticket;
            String num = mDataset.get(position).ticket;
            String[] split = num.split(" ");
            for(int j = 0;j < split.length;j++){
                images[j].setText(split[j]);
            }
            holder.linear.addView(view);
            win.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    //holder.linear.removeView(view);
                    //mDataset.remove(holder.getAdapterPosition());
                    mDataset.remove(holder.getAdapterPosition());
                    Log.d("adapter",mDataset.size()+"");
                    notifyItemRemoved(holder.getAdapterPosition());
                    notifyItemRangeChanged(holder.getAdapterPosition(), getItemCount());
                    //notifyDataSetChanged();

                    SharedPrefHelper.setMyTickets(holder.context,mDataset,"powerball");
                }
            });
        }else{
            View view;
            LayoutInflater inflater = (LayoutInflater)   holder.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            view = inflater.inflate(R.layout.balls1, null);
            TextView ball1 = (TextView) view.findViewById(R.id.ball1m);
            TextView ball2 = (TextView) view.findViewById(R.id.ball2m);
            TextView ball3 = (TextView) view.findViewById(R.id.ball3m);
            TextView ball4 = (TextView) view.findViewById(R.id.ball4m);
            TextView ball5 = (TextView) view.findViewById(R.id.ball5m);
            TextView ball6 = (TextView) view.findViewById(R.id.ball6m);
            TextView multi = (TextView) view.findViewById(R.id.multim);
            multi.setText("Multiplier: " + mDataset.get(position).multi);
            TextView win = (TextView)view.findViewById(R.id.winm);
            win.setText(holder.context.getResources().getString(R.string.remove));
            TextView[] images = {ball1,ball2,ball3,ball4,ball5,ball6};
            String num = mDataset.get(position).ticket;
            String[] split = num.split(" ");
            for(int j = 0;j < split.length;j++){
                images[j].setText(split[j]);
            }
            holder.linear.addView(view);
            win.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    //holder.linear.removeView(view);
                    mDataset.remove(holder.getAdapterPosition());

                    notifyItemRemoved(holder.getAdapterPosition());
                    notifyItemRangeChanged(holder.getAdapterPosition(), 1);
                    //notifyDataSetChanged();

                    SharedPrefHelper.setMyTickets(holder.context,mDataset,"megamillions");
                }
            });
        }

    }

    // Return the size of your dataset (invoked by the layout manager)
    @Override
    public int getItemCount() {
        return mDataset.size();
    }

Answer 1

也许需要从回收器中删除 View

recycler.removeViewAt(position);

看起来this

但我认为，如果您尝试在从适配器获取回调调用时更改适配器中的列表，也许您的逻辑会变得更加清晰。

我的意思是在 Kotlin 上:

 interface RemoveListern{
      fun onRemove()
    }

     class Adapter(val listenr:RemoveListener)...


 on Activity:

          val adapter = Adapter(object:RemoveListener{

           oveeride fun onRemove(){
                //<----  MODIFY HERE
                list.remove(position);
                recycler.removeViewAt(position);
                mAdapter.notifyItemRemoved(position);                 
                mAdapter.notifyItemRangeChanged(position, list.size())
           }
})