java - 这段代码如何编写Gson？

Question

在此代码中，我正在解析 JSON 并使用 ArrayList 将其显示在可搜索的微调器中。该代码运行完美，但在解析大型 JSON 时，需要花费时间和移动数据的内存。

任何人都可以建议我一个更好的想法来解析大型 JSON，或者任何人都可以解释我如何使用 Gson 解析它并加载到可搜索微调器中吗？

   try {
       if (response.has("products_data")) {
            jsonArray = new JSONArray();
               jsonArray = response.getJSONArray("products_data");
            for (int t = 0; t < jsonArray.length(); t++) {
               object = jsonArray.getJSONObject(t);
               retailer_id = object.getString("retailer_id");
               retailer_name = object.getString("retailer_name");
               product_code = object.getString("product_code");
               product_name = object.getString("product_name");
               pro_packing = object.getString("pro_packing");
               pro_company=object.getString("pro_company");
               pro_generic_code=object.getString("pro_generic_code");
               pro_generic_name=object.getString("pro_generic_name");
               pro_stock = object.getInt("product_stock");
               product_MRP=object.getDouble("product_MRP");
               p = new Product();
               p.setRetailer_id(retailer_id);
               p.setRetailer_name(retailer_name);
               p.setProduct_code(product_code);
               p.setProduct_name(product_name);
               p.setPro_packing(pro_packing);
               p.setPro_company(pro_company);
               p.setPro_generic_code(pro_generic_code);
               p.setPro_generic_name(pro_generic_name);
               p.setPro_stock(pro_stock);
               p.setProduct_MRP(product_MRP);
               productlist.add(p);
               }
               progressDialog.dismiss();

         final List<String> pname = new ArrayList<String>();
         final List<String> pcode = new ArrayList<String>();
         pname.clear();
         pname.add(0,"Select Products");
         for (int i = 0; i < productlist.size(); i++) {
                                       pname.add(productlist.get(i).getProduct_name());
                                }
               // Creating adapter for spinner
         final ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(getApplicationContext(),R.layout.custom_spinnertxt, pname);

                                spinnerAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
             runOnUiThread(new Runnable() {
                    @Override
                public void run() {
                       // attaching data adapter to spinner

   autoCompleteTextView.setAdapter(spinnerAdapter);
                                        autoCompleteTextView.setSelection(0);
                                    }
                                });
                                     autoCompleteTextView.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
          @Override
       public void onItemSelected(AdapterView<?> parent, View view, int i, long id) {
          if(i>0) {
         p_id = productlist.get(i - 1).getProduct_code();
         p_stock = productlist.get(i - 1).getPro_stock();
         ppack = productlist.get(i - 1).getPro_packing();
         pcomp = productlist.get(i - 1).getPro_company();
         mrp = productlist.get(i - 1).getProduct_MRP();
         pseller = productlist.get(i - 1).getRetailer_name();
        // Log.i("pID:", p_id);
        //Log.i("pStock:", String.valueOf(p_stock));
         //Log.i("PMRP:", String.valueOf(mrp));
                                        }
                                    }

                                    @Override
  public void onNothingSelected(AdapterView<?> parent) {

                                    }
                                });

                            }

                        }

这是我的 JSON 响应:

"products_data": [
{
  "retailer_id": "mum0022",
  "retailer_name": "SAKTI MEDICO",
  "product_code": "6474",
  "product_name": "EPISOFT CLEANSING LOTION",
  "pro_packing": "125ML",
  "pro_company": "GLENMARK-GRACEWELLSPECIALITY",
  "pro_generic_code": "",
  "pro_generic_name": "",
  "product_stock": "7",
  "product_MRP": "209"
},
{
  "retailer_id": "mum0022",
  "retailer_name": "SAKTI MEDICO",
  "product_code": "8403",
  "product_name": "ELOVERA LOTION 150ML (BIG)",
  "pro_packing": "150ML",
  "pro_company": "GLENMARK (DERMAX)",
  "pro_generic_code": "",
  "pro_generic_name": "",
  "product_stock": "3",
  "product_MRP": "324.5"
},
...

Answer 1

试试这个

public class Products_data implements Parcelable {
@SerializedName("retailer_id")
private String retailer_id;

@SerializedName("retailer_name")
private String retailer_name;

@SerializedName("product_code")
private String product_code;

@SerializedName("product_name")
private String product_name;

@SerializedName("pro_packing")
private String pro_packing;

@SerializedName("pro_company")
private String pro_company;

@SerializedName("pro_generic_code")
private String pro_generic_code;

@SerializedName("pro_generic_name")
private String pro_generic_name;

@SerializedName("product_stock")
private Integer product_stock;

@SerializedName("product_MRP")
private Double product_MRP;


public Products_data() {
}

protected Products_data(Parcel in) {
    retailer_id = in.readString();
    retailer_name = in.readString();
    product_code = in.readString();
    product_name = in.readString();
    pro_packing = in.readString();
    pro_company = in.readString();
    pro_generic_code = in.readString();
    pro_generic_name = in.readString();
    product_stock = in.readInt();
    product_MRP = in.readDouble();
}

public static final Creator<Products_data> CREATOR = new Creator<Products_data>() {
    @Override
    public Products_data createFromParcel(Parcel in) {
        return new Products_data(in);
    }

    @Override
    public Products_data[] newArray(int size) {
        return new Products_data[size];
    }
};

public String getRetailer_id() {
    return retailer_id;
}

public void setRetailer_id(String retailer_id) {
    this.retailer_id = retailer_id;
}

public String getRetailer_name() {
    return retailer_name;
}

public void setRetailer_name(String retailer_name) {
    this.retailer_name = retailer_name;
}

public String getProduct_code() {
    return product_code;
}

public void setProduct_code(String product_code) {
    this.product_code = product_code;
}

public String getProduct_name() {
    return product_name;
}

public void setProduct_name(String product_name) {
    this.product_name = product_name;
}

public String getPro_packing() {
    return pro_packing;
}

public void setPro_packing(String pro_packing) {
    this.pro_packing = pro_packing;
}

public String getPro_company() {
    return pro_company;
}

public void setPro_company(String pro_company) {
    this.pro_company = pro_company;
}

public String getPro_generic_code() {
    return pro_generic_code;
}

public void setPro_generic_code(String pro_generic_code) {
    this.pro_generic_code = pro_generic_code;
}

public String getPro_generic_name() {
    return pro_generic_name;
}

public void setPro_generic_name(String pro_generic_name) {
    this.pro_generic_name = pro_generic_name;
}

public Integer getProduct_stock() {
    return product_stock;
}

public void setProduct_stock(Integer product_stock) {
    this.product_stock = product_stock;
}

public Double getProduct_MRP() {
    return product_MRP;
}

public void setProduct_MRP(Double product_MRP) {
    this.product_MRP = product_MRP;
}

@Override
public int describeContents() {
    return 0;
}

@Override
public void writeToParcel(Parcel parcel, int i) {
    parcel.writeString(retailer_id);
    parcel.writeString(retailer_name);
    parcel.writeString(product_code);
    parcel.writeString(product_name);
    parcel.writeString(pro_packing);
    parcel.writeString(pro_company);
    parcel.writeString(pro_generic_code);
    parcel.writeString(pro_generic_name);
    parcel.writeInt(product_stock);
    parcel.writeDouble(product_MRP);
}
}

创建 POJO 类后

gson.fromJson(json, Products_data.class);