从回收站视图中获取多个选定的数据并将数据存储到数据库

Posted 2023-04-19

【中文标题】从回收站视图中获取多个选定的数据并将数据存储到数据库

【英文标题】：Get multiple selected data from recycler view and store the data to database

【发布时间】：2020-12-23 06:09:39

【问题描述】：

我有一个显示来自 json api 的数据的回收站视图。我将其设为多项选择，因此用户可以从列表中选择多个数据。当用户单击按钮时，我想使用 volley 将所选数据存储到我的数据库表的不同列中。

我已经做到了，但是存储在数据库中的数据是相同的，我的意思是每一列都存储了相同的数据。我想让每一列得到不同的数据。

例如：用户选择 3 个数据，例如 data1、data2 和 data3。当用户点击按钮时，存储在 db 上的数据是：

第 1 栏 |第 2 栏 |第 3 栏

数据1 |数据1 |数据1

数据2 |数据2 |数据2

数据3 |数据3 |数据3

我想要实现的是当用户点击按钮存储数据时，列将：

第 1 列 |第 2 列 |第 3 列

数据1 |数据2 |数据3

谁有解决办法？

在我的代码下面：

Activity.java

public class AddTagActivity extends AppCompatActivity 

private RecyclerView recyclerView;
private ArrayList<TagItem> tagItemArrayList = new ArrayList<>();
private TagAdapter adapter;
private Button save;
private String url = "http://agenproduk.dianarthaselaras.com/user/tag";

@Override
protected void onCreate(Bundle savedInstanceState) 
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_add_tag);

    save = findViewById(R.id.save);
    recyclerView = findViewById(R.id.tag_rview);

    int numberOfColumns = 2;
    //recyclerView.setLayoutManager(new LinearLayoutManager(this));
    recyclerView.setLayoutManager(new GridLayoutManager(this, numberOfColumns));
    recyclerView.addItemDecoration(new DividerItemDecoration(this, LinearLayoutManager.VERTICAL));
    adapter = new TagAdapter(this, tagItemArrayList);
    recyclerView.setAdapter(adapter);

    getData();

    save.setOnClickListener(new View.OnClickListener() 
        @Override
        public void onClick(View view) 
            if (adapter.getSelected().size() > 0) 
                StringBuilder stringBuilder = new StringBuilder();
                for (int i = 0; i < adapter.getSelected().size(); i++) 
                    stringBuilder.append(adapter.getSelected().get(i).getTagList());
                    stringBuilder.append("\n");

                
                //showToast(stringBuilder.toString().trim());
                postTag(stringBuilder.toString().trim(), stringBuilder1.toString().trim(), stringBuilder2.toString().trim());
             else 
                //showToast("No Selection");
            
        
    );


private void getData()
    final ProgressDialog progressDialog = new ProgressDialog(this);
    progressDialog.setMessage("Loading...");
    progressDialog.show();

    RequestQueue requestQueue = Volley.newRequestQueue(this);
    String URL_READ = url;
    System.out.print(URL_READ);
    JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.GET, URL_READ,null,
            new Response.Listener<JSONObject>() 
                @Override
                public void onResponse(JSONObject response) 
                    progressDialog.dismiss();
                    System.out.println(response);
                    try
                        JSONArray jsonArray = response.getJSONArray("tag");
                        Gson gson = new Gson();
                        tagItemArrayList.clear();
                        for (int k = 0; k < jsonArray.length(); k++) 

                            JSONObject jsonObject = jsonArray.getJSONObject(k);
                            TagItem data = gson.fromJson(String.valueOf(jsonObject), TagItem.class);
                            tagItemArrayList.add(data);

                        
                        adapter.notifyDataSetChanged();
                        recyclerView.setAdapter(adapter);

                        progressDialog.dismiss();

                     catch (JSONException e) 
                        e.printStackTrace();
                        progressDialog.dismiss();
                        Toast.makeText(AddTagActivity.this, "Error "+e.toString(), LENGTH_SHORT).show();
                    
                

            ,
            new Response.ErrorListener() 
                @Override
                public void onErrorResponse(VolleyError error) 
                    progressDialog.dismiss();
                    Toast.makeText(AddTagActivity.this, "Error "+error.toString(), LENGTH_SHORT).show();
                
            )
    

        @Override
        public Map<String, String> getHeaders() throws AuthFailureError 
            Map<String, String> params = new HashMap<String, String>();
            params.put("Accept", "application/json");
            return params;
        
    ;
    requestQueue.add(jsonObjectRequest);


private void showToast(String msg) 
    Toast.makeText(this, msg, Toast.LENGTH_SHORT).show();


private void postTag(final String tag1, final String tag2, final String tag3)

    Intent intent = getIntent();
    final String idd = intent.getStringExtra("id");
    final String name = intent.getStringExtra("nama");

    String URL_REGISTER = "http://agenproduk.dianarthaselaras.com/user/addtag";
    StringRequest stringRequest = new StringRequest(Request.Method.POST, URL_REGISTER,
            new Response.Listener<String>() 
                @Override
                public void onResponse(String response) 
                    try
                        JSONObject jsonObject = new JSONObject(response);
                        new Handler().postDelayed(new Runnable() 
                            @Override
                            public void run() 
                            

                        , 3000);


                     catch (JSONException e)
                        e.printStackTrace();
                        Toast.makeText(AddTagActivity.this, "Failed" + e.toString(), Toast.LENGTH_SHORT).show();

                    
                
            ,
            new Response.ErrorListener() 
                @Override
                public void onErrorResponse(VolleyError error) 
                    Toast.makeText(AddTagActivity.this, "Failed" + error.toString(), Toast.LENGTH_SHORT).show();
                
            )

    

        @Override
        public String getBodyContentType() 
            return "application/x-www-form-urlencoded; charset=UTF-8";
        

        @Override
        public Map<String, String> getParams() 
            Map<String, String> params = new HashMap<>();
            params.put("userid", idd);
            params.put("user_name", name);
            params.put("tag1", tag1);
            params.put("tag2", tag2);
            params.put("tag3", tag3);
            params.put("Content-Type","application/x-www-form-urlencoded");
            return params;
        
    ;

    RequestQueue requestQueue = Volley.newRequestQueue(this);
    requestQueue.add(stringRequest);

适配器.java

public class TagAdapter extends RecyclerView.Adapter<TagAdapter.TagViewHolder> 

private Context context;
private ArrayList<TagItem> tag;

public TagAdapter(Context context, ArrayList<TagItem> tag) 
    this.context = context;
    this.tag = tag;


public void setTag(ArrayList<TagItem> tag) 
    this.tag = new ArrayList<>();
    this.tag = tag;
    notifyDataSetChanged();


@NonNull
@Override
public TagViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) 
    View view = LayoutInflater.from(context).inflate(R.layout.item_tag, viewGroup, false);
    return new TagViewHolder(view);


@Override
public void onBindViewHolder(@NonNull TagViewHolder tagViewHolder, int position) 
    tagViewHolder.bind(tag.get(position));


@Override
public int getItemCount() 
    return tag.size();


class TagViewHolder extends RecyclerView.ViewHolder 

    private TextView textView;
    private ImageView imageView;

    TagViewHolder(@NonNull View itemView) 
        super(itemView);
        textView = itemView.findViewById(R.id.textView);
        imageView = itemView.findViewById(R.id.imageView);
    

    void bind(final TagItem tag) 
        imageView.setVisibility(tag.isChecked() ? View.VISIBLE : View.GONE);
        textView.setText(tag.getTagList());

        itemView.setOnClickListener(new View.OnClickListener() 
            @Override
            public void onClick(View view) 
                tag.setChecked(!tag.isChecked());
                imageView.setVisibility(tag.isChecked() ? View.VISIBLE : View.GONE);
            
        );
    


public ArrayList<TagItem> getAll() 
    return tag;


public ArrayList<TagItem> getSelected() 
    ArrayList<TagItem> selected = new ArrayList<>();
    for (int i = 0; i < tag.size(); i++) 
        if (tag.get(i).isChecked()) 
            selected.add(tag.get(i));
        
    
    return selected;

【参考方案1】：

如果选择了超过 3 个项目，我不知道您要发布哪些项目

if (adapter.getSelected().size() == 1) 
        postTag(adapter.getSelected().get(0).getTagList(), null, null);
     else if (adapter.getSelected().size() == 2) 
        postTag(adapter.getSelected().get(0).getTagList(),
                adapter.getSelected().get(1).getTagList(),
                null);
     else if (adapter.getSelected().size() > 2) 
        postTag(adapter.getSelected().get(0).getTagList(),
                adapter.getSelected().get(1).getTagList(),
                adapter.getSelected().get(2).getTagList());