android - RecyclerView textChangeListener 或数据绑定(bind)

Question

我有一个 RecylerView，其中每一行都有一个 EditText。此 EditText 供用户输入玩家名称。当用户输入名称时，我需要 Adapter 正在查看的列表以某种方式更新。

首先我想我会在 EditText 上放置一个 textChangedListener ，这部分起作用了。 问题是当用户添加新行或删除行时，似乎每个 EditText 的监听器在调用 notifyDataSetChanged() 时被调用 Adapter . notifyDataSetChanged() 也从 textChangedListener 调用，给出错误

Cannot call this method while RecyclerView is computing a layout or scrolling android.support.v7.widget.RecyclerView.

另一种选择是不使用textChangedListener，而是仅在用户添加一行、删除一行或开始游戏时才更新适配器列表。但是为此，我不知何故需要从 RecyclerView 中存在的所有 editTexts 中获取信息，但我还没有找到这样做的方法。如果这是可能的，我可以简单地清除适配器列表，并在每次调用 notifyDataSetChanged() 时替换为用户放入 recyclerView 的任何内容。

第三种选择 是使用数据绑定(bind)。我一直在尝试遵循指南，但没有成功。绑定(bind)必须使 editTexts 直接更新适配器列表，并且最好在列表更改时更新 EditText，但这并不重要。

关于如何最好地实现它有什么想法吗？

public class ReviewAdapter extends RecyclerView.Adapter<ReviewAdapter.MyViewHolder> {

private ArrayList<String> data;

public ReviewAdapter(ArrayList<String> data) {

    this.data = data;
}

@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    Context c = parent.getContext();
    LayoutInflater inflater = LayoutInflater.from(c);
    View view = inflater.inflate(R.layout.custom_row, parent, false);
    MyViewHolder holder = new MyViewHolder(view);

    return holder;
}

@Override
public void onBindViewHolder(MyViewHolder holder, int position) {

    holder.txtPlayerName.setText(data.get(position));
    holder.txtRowNumber.setText(position+1 + "");
    holder.btnRemoveRow.setOnClickListener(new MyClickListener(position, holder.btnRemoveRow));
    holder.txtPlayerName.addTextChangedListener(new MyTextWatcher(position));

}

@Override
public int getItemCount() {
    return data.size();
}

class MyClickListener implements View.OnClickListener {

    private int pos;
    Button button;


    public MyClickListener(int _pos, Button _button) {
        super();
        pos = _pos;
        button = _button;


    }

    @Override
    public void onClick(View view) {
        data.remove(pos);
        System.out.println("MyClickListener.onClick.pos: " + pos);
        MainActivity.txtPlayers.setText(data.size() + " players");
        ReviewAdapter.this.notifyDataSetChanged();
    }
}

class MyTextWatcher implements TextWatcher {

    int pos;

    public MyTextWatcher(int pos) {
        this.pos = pos;
    }

    @Override
    public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
    }

    @Override
    public void onTextChanged(CharSequence s, int i, int i1, int i2) {
        data.set(pos, s.toString());
        notifyDataSetChanged();

    }

    @Override
    public void afterTextChanged(Editable editable) {
    }
}


class MyViewHolder extends RecyclerView.ViewHolder {

    EditText txtPlayerName;
    TextView txtRowNumber;
    Button btnRemoveRow;

    public MyViewHolder(View view) {
        super(view);

        txtPlayerName = itemView.findViewById(R.id.listText);
        txtRowNumber = itemView.findViewById(R.id.listIcon);
        btnRemoveRow = itemView.findViewById(R.id.btnRemove);
    }
}
}

Answer 1

修改并缩小了您的 Adapter 类。永远不要在 onBindViewHolder 中分配 onClickListener 而不是那个类你可以使用这个可能会解决你的问题。

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import java.util.ArrayList;

public class ReviewAdapter extends RecyclerView.Adapter<ReviewAdapter.MyViewHolder> {

    private ArrayList<String> data;
    private Context mContext;

    public ReviewAdapter(Context mContext, ArrayList<String> data) {
        this.mContext=mContext;
        this.data = data;
    }

    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.custom_row, parent, false);
        return new MyViewHolder(view);
    }

    @Override
    public void onBindViewHolder(MyViewHolder holder, int position) {

        holder.txtPlayerName.setText(data.get(position));
        holder.txtRowNumber.setText(String.valueOf(position + 1));

    }

    @Override
    public int getItemCount() {
        return data.size();
    }


    class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener, TextWatcher {

        EditText txtPlayerName;
        TextView txtRowNumber;
        Button btnRemoveRow;

        public MyViewHolder(View view) {
            super(view);

            txtPlayerName = itemView.findViewById(R.id.listText);
            txtRowNumber = itemView.findViewById(R.id.listIcon);
            btnRemoveRow = itemView.findViewById(R.id.btnRemove);
            btnRemoveRow.setOnClickListener(this);
            txtPlayerName.addTextChangedListener(this);
        }

        @Override
        public void onClick(View view) {
            if (view == btnRemoveRow) {
                data.remove(getAdapterPosition());
                System.out.println("MyClickListener.onClick.pos: " + getAdapterPosition());
                MainActivity.txtPlayers.setText(data.size() + " players");
                notifyDataSetChanged();
            }
        }

        @Override
        public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

        }

        @Override
        public void onTextChanged(CharSequence s, int i, int i1, int i2) {
            data.set(getAdapterPosition(), s.toString());
            //notifyItemChanged(getAdapterPosition());

        }

        @Override
        public void afterTextChanged(Editable editable) {

        }
    }
}