记事本应用编辑

Question

我尝试开发一个应用程序（笔记本）但删除并编辑按钮，因为每个帖子都不起作用，如果我点击了删除按钮的第4号帖子，每个帖子，帖子号码0将删除，同样适用于编辑。

如何获取position中每个帖子的RecyclerView，以便删除和修改功能

代码：

public class NoteAdapter extends RecyclerView.Adapter<NoteAdapter.NoteViewHolder> {

public static final int REQUEST_FOR_ACTIVITY_CODE = 102;
public static int itemPosition;
public static String state = "";
private Context context;
private List<Note> notes = new ArrayList<>();
Note note = new Note();

public NoteAdapter(Context context) {
    this.context = context;


}


@NonNull
@Override
public NoteViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    return new NoteViewHolder(LayoutInflater.from(context).inflate(R.layout.layout_item_note, parent, false));
}

@Override
public void onBindViewHolder(@NonNull final NoteViewHolder holder, int position) {

    holder.bindNote(notes.get(position));

    holder.editButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            state = "edit";
            Intent editintent = new Intent(context, NoteActivity.class);
            editintent.putExtra("title", holder.textViewTitle.getText().toString());
            editintent.putExtra("content", holder.textViewContent.getText().toString());
            // context.startActivity(editintent);


            ((Activity) context).startActivityForResult(editintent, REQUEST_FOR_ACTIVITY_CODE);


        }
    });


    holder.removeButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            removeNote(itemPosition);

        }
    });
}

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

public class NoteViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
    public TextView textViewTitle;
    public TextView textViewContent;
    public ImageButton removeButton;
    public ImageButton editButton;

    public NoteViewHolder(View itemView) {
        super(itemView);


        textViewTitle = itemView.findViewById(R.id.txt_title);
        textViewContent = itemView.findViewById(R.id.txt_note);
        removeButton = itemView.findViewById(R.id.btn_remove);
        editButton = itemView.findViewById(R.id.btn_edit);
    }

    public void bindNote(Note note) {
        textViewTitle.setText(note.getTitle());
        textViewContent.setText(note.getContent());


    }


    @Override
    public void onClick(View v) {

        itemPosition = note.getId();
    }
}


public void setNote(Note note) {
    notes.add(note);
    notifyItemInserted(notes.size() - 1);

}

public void setEditNote(Note note) {
    notes.set(itemPosition, note);

    notifyDataSetChanged();

}

public void removeNote(int position) {
    notes.remove(position);
    notifyItemRemoved(position);

}

public void clearAll() {
    notes = new ArrayList<>();
    notifyDataSetChanged();
}

}

Answer 1

将您的点击监听器设置为NoteViewHolder，而不是NoteAdapter，然后在viewHolder调用中找到您的项目位置getAdapterPosition()

您的方法可以通过这种方式实现：

首先，创建界面NoteEditListener

interface NoteEditListener {
    void edit(int position);
}

第二次，从NoteAdapter实施此界面并覆盖edit方法

public class NoteAdapter implements NoteEditListener 

public void edit(int position){
    // todo edit your item in position
}

第三次，将NoteEditListener添加到viewHolder构造函数并从适配器传递this

public class NoteViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
    public TextView textViewTitle;
    public TextView textViewContent;
    public ImageButton removeButton;
    public ImageButton editButton;

    public NoteViewHolder(View itemView, final NoteEditListener listener) {
        super(itemView);

        textViewTitle = itemView.findViewById(R.id.txt_title);
        textViewContent = itemView.findViewById(R.id.txt_note);
        removeButton = itemView.findViewById(R.id.btn_remove);
        editButton = itemView.findViewById(R.id.btn_edit);
        editButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                listener.edit(getAdapterPosition());
            }
        }
     }