php - 如何使用 volley 删除 recyclerview 中的项目？

Question

您好，我已通过将回收 View 与 MYSQL PHP 链接成功地插入项目，但删除项目仍然失败。你可以在客户端删除它，但我用 PHP 和 MYSQL 总是失败。我可以获得有关此示例或代码的帮助吗？

这是recyclerview适配器代码

public class CardAdapter extends RecyclerView.Adapter<CardAdapter.ViewHolder> {

    //Imageloader to load image
    private ImageLoader imageLoader;
    private Context context;

    //List to store all superheroes
    List<recyclerview_list> recyclerview_lists;

    //Constructor of this class
    public CardAdapter(List<recyclerview_list> recyclerview_lists, recyclerview context) {
        super();
        //Getting all superheroes
        this.recyclerview_lists = recyclerview_lists;
        this.context = (Context) context;
    }

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

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

        //Getting the particular item from the list
        recyclerview_list recyclerview_List = recyclerview_lists.get(position);

        //Loading image from url
        imageLoader = CustomVolleyRequest.getInstance(context).getImageLoader();
        imageLoader.get(recyclerview_List.getImage_path(), ImageLoader.getImageListener(holder.imageView, R.drawable.ic_launcher_background, android.R.drawable.ic_dialog_alert));

        //Showing data on the views
        holder.imageView.setImageUrl(recyclerview_List.getImage_path(), imageLoader);
        holder.textViewName.setText(recyclerview_List.getImage_name());

    }

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

    class ViewHolder extends RecyclerView.ViewHolder {
        //Views
        public NetworkImageView imageView;
        public TextView textViewName;
        public Button deleteButton;

        //Initializing Views
        public ViewHolder(final View itemView) {
            super(itemView);
            imageView = (NetworkImageView) itemView.findViewById(R.id.imageViewHero);
            textViewName = (TextView) itemView.findViewById(R.id.textViewName);
            deleteButton = (Button) itemView.findViewById(R.id.buttonDelete);
            deleteButton.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    Toast.makeText(context, "Delete", Toast.LENGTH_SHORT).show();
                    delete(getAdapterPosition());


                }
            });

        }

        public void delete(int position) {

            try {
                recyclerview_lists.remove(position);
                notifyItemRemoved(position);
            } catch (IndexOutOfBoundsException ex) {
                ex.printStackTrace();
            }
        }
    }
}

这是PHP代码

$con = mysqli_connect("", "", "", "");

$id = $_POST["id"];

$statement = mysqli_prepare($con, "DELETE FROM image WHERE id = ?");
mysqli_stmt_bind_param($statement, "s", $id);
mysqli_stmt_execute($statement);

$response = array();
$response["success"] = true;

echo json_encode($response);

Answer 1

在适配器调用中添加新方法

  public void deleteFromServer(int id)
        {
         url = "http://yoururl/delete_image.php";
            StringRequest postRequest = new StringRequest(Request.Method.POST, url, 
                new Response.Listener<String>() 
                {
                    @Override
                    public void onResponse(String response) {
                        // if success 
                        delete(id)
                        Log.d("Response", response);
                    }
                }, 
                new Response.ErrorListener() 
                {
                     @Override
                     public void onErrorResponse(VolleyError error) {
                         // error
                         Log.d("Error.Response", response);
                   }
                }
            ) {     
                @Override
                protected Map<String, String> getParams() 
                {  
                        Map<String, String>  params = new HashMap<String, String>();  
                        params.put("id", id);  

                        return params;  
                }
            };
            queue.add(postRequest);
        }

从适配器类调用这个方法

deleteButton.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    Toast.makeText(context, "Delete", Toast.LENGTH_SHORT).show();
                    deleteFromServer(recyclerview_lists.get(getAdapterPosition()).id);


                }
            });