Android搭載のJSONからデータを取得すると、致命的なエラーが発生します

Question

私は助けが必要です。私はアンドロイドに新しいので、助けが必要です。私はJSONからデータを受け取る必要があり、私はチュートリアルの沢山を見て、私は私の答えを見つけることができません。 JSONリンクからデータを受け取る必要があります。一度私はそれを私はエラーの戦利品を取得し、また、コンパイラは私に多くのエラーを与える。

CustomItemAdapter.javaと呼ばれる私のカスタムアダプタ

package com.example.madrit.okhttp_gson_view; 


import android.content.Context; 
import android.support.annotation.Nullable; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.ArrayAdapter; 
import android.widget.TextView; 

import java.util.ArrayList; 
import java.util.List; 

public class CustomItemAdapter extends ArrayAdapter <model_item> { 
    public CustomItemAdapter(Context context , List<model_item> mymodel) 
    { 
     super(context , 0 , mymodel); 

    } 

    @Nullable 
    @Override 
    public model_item getItem(int position) { 
     return super.getItem(position); 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     model_item model = getItem(position); 
     if (convertView==null){ 
      convertView = LayoutInflater.from(getContext()).inflate(R.layout.item_shop_list, parent, false); 
     } 
     TextView title = (TextView) convertView.findViewById(R.id.item_onthelist_title); 
     TextView price = (TextView) convertView.findViewById(R.id.item_onthelist_price); 
     TextView description = (TextView) convertView.findViewById(R.id.item_onthelist_description); 
     title.setText(model.getName()); 
     price.setText(Double.toString(model.getPrice())); 
     description.setText(model.getMeta_description()); 
     return convertView; 
    } 
} 

私のモデル項目model_item.java

package com.example.madrit.okhttp_gson_view; 

import com.google.gson.annotations.SerializedName; 

import java.util.List; 

import com.google.gson.annotations.SerializedName; 

import java.util.List; 

public class model_item { 
    private String id_product; 
    private String id_supplier; 
    private String id_manufacturer; 
    private String id_category_default; 
    private String id_shop_default; 
    private String id_tax_rules_group; 
    private String on_sale; 
    private String online_only; 
    private String ean13; 
    private String upc; 
    private String ecotax; 
    private int quantity; 
    private String minimal_quantity; 
    private double price; 
    private String wholesale_price; 
    private String unity; 
    private String unit_price_ratio; 
    private String additional_shipping_cost; 
    private String reference; 
    private String supplier_reference; 
    private String location; 
    private String width; 
    private String height; 
    private String depth; 
    private String weight; 
    private String out_of_stock; 
    private String quantity_discount; 
    private String customizable; 
    private String uploadable_files; 
    private String text_fields; 
    private String active; 
    private String redirect_type; 
    private String id_product_redirected; 
    private String available_for_order; 
    private String available_date; 
    private String condition; 
    private String show_price; 
    private String indexed; 
    private String visibility; 
    private String cache_is_pack; 
    private String cache_has_attachments; 
    private String is_virtual; 
    private String cache_default_attribute; 
    private String date_add; 
    private String date_upd; 
    private String advanced_stock_management; 
    private String pack_stock_type; 
    private String id_shop; 
    private int id_product_attribute; 
    private String product_attribute_minimal_quantity; 
    private String description; 
    private String description_short; 
    private String available_now; 
    private String available_later; 
    private String link_rewrite; 
    private String meta_description; 
    private String meta_keywords; 
    private String meta_title; 
    private String name; 
    private String id_image; 
    private String legend; 
    private String manufacturer_name; 
    private String category_default; 
    @SerializedName("new") 
    private String newX; 
    private String orderprice; 
    private int allow_oosp; 
    private String category; 
    private String link; 
    private int attribute_price; 
    private double price_tax_exc; 
    private double price_without_reduction; 
    private int reduction; 
    private boolean specific_prices; 
    private int quantity_all_versions; 
    private int virtual; 
    private int pack; 
    private int nopackprice; 
    private boolean customization_required; 
    private int rate; 
    private String tax_name; 
    private String image_url; 
    private List<?> features; 
    private List<?> attachments; 
    private List<?> packItems; 

    public String getId_product() { 
     return id_product; 
    } 

    public void setId_product(String id_product) { 
     this.id_product = id_product; 
    } 

    public String getId_supplier() { 
     return id_supplier; 
    } 

    public void setId_supplier(String id_supplier) { 
     this.id_supplier = id_supplier; 
    } 

    public String getId_manufacturer() { 
     return id_manufacturer; 
    } 

    public void setId_manufacturer(String id_manufacturer) { 
     this.id_manufacturer = id_manufacturer; 
    } 

    public String getId_category_default() { 
     return id_category_default; 
    } 

    public void setId_category_default(String id_category_default) { 
     this.id_category_default = id_category_default; 
    } 

    public String getId_shop_default() { 
     return id_shop_default; 
    } 

    public void setId_shop_default(String id_shop_default) { 
     this.id_shop_default = id_shop_default; 
    } 

    public String getId_tax_rules_group() { 
     return id_tax_rules_group; 
    } 

    public void setId_tax_rules_group(String id_tax_rules_group) { 
     this.id_tax_rules_group = id_tax_rules_group; 
    } 

    public String getOn_sale() { 
     return on_sale; 
    } 

    public void setOn_sale(String on_sale) { 
     this.on_sale = on_sale; 
    } 

    public String getOnline_only() { 
     return online_only; 
    } 

    public void setOnline_only(String online_only) { 
     this.online_only = online_only; 
    } 

    public String getEan13() { 
     return ean13; 
    } 

    public void setEan13(String ean13) { 
     this.ean13 = ean13; 
    } 

    public String getUpc() { 
     return upc; 
    } 

    public void setUpc(String upc) { 
     this.upc = upc; 
    } 

    public String getEcotax() { 
     return ecotax; 
    } 

    public void setEcotax(String ecotax) { 
     this.ecotax = ecotax; 
    } 

    public int getQuantity() { 
     return quantity; 
    } 

    public void setQuantity(int quantity) { 
     this.quantity = quantity; 
    } 

    public String getMinimal_quantity() { 
     return minimal_quantity; 
    } 

    public void setMinimal_quantity(String minimal_quantity) { 
     this.minimal_quantity = minimal_quantity; 
    } 

    public double getPrice() { 
     return price; 
    } 

    public void setPrice(double price) { 
     this.price = price; 
    } 

    public String getWholesale_price() { 
     return wholesale_price; 
    } 

    public void setWholesale_price(String wholesale_price) { 
     this.wholesale_price = wholesale_price; 
    } 

    public String getUnity() { 
     return unity; 
    } 

    public void setUnity(String unity) { 
     this.unity = unity; 
    } 

    public String getUnit_price_ratio() { 
     return unit_price_ratio; 
    } 

    public void setUnit_price_ratio(String unit_price_ratio) { 
     this.unit_price_ratio = unit_price_ratio; 
    } 

    public String getAdditional_shipping_cost() { 
     return additional_shipping_cost; 
    } 

    public void setAdditional_shipping_cost(String additional_shipping_cost) { 
     this.additional_shipping_cost = additional_shipping_cost; 
    } 

    public String getReference() { 
     return reference; 
    } 

    public void setReference(String reference) { 
     this.reference = reference; 
    } 

    public String getSupplier_reference() { 
     return supplier_reference; 
    } 

    public void setSupplier_reference(String supplier_reference) { 
     this.supplier_reference = supplier_reference; 
    } 

    public String getLocation() { 
     return location; 
    } 

    public void setLocation(String location) { 
     this.location = location; 
    } 

    public String getWidth() { 
     return width; 
    } 

    public void setWidth(String width) { 
     this.width = width; 
    } 

    public String getHeight() { 
     return height; 
    } 

    public void setHeight(String height) { 
     this.height = height; 
    } 

    public String getDepth() { 
     return depth; 
    } 

    public void setDepth(String depth) { 
     this.depth = depth; 
    } 

    public String getWeight() { 
     return weight; 
    } 

    public void setWeight(String weight) { 
     this.weight = weight; 
    } 

    public String getOut_of_stock() { 
     return out_of_stock; 
    } 

    public void setOut_of_stock(String out_of_stock) { 
     this.out_of_stock = out_of_stock; 
    } 

    public String getQuantity_discount() { 
     return quantity_discount; 
    } 

    public void setQuantity_discount(String quantity_discount) { 
     this.quantity_discount = quantity_discount; 
    } 

    public String getCustomizable() { 
     return customizable; 
    } 

    public void setCustomizable(String customizable) { 
     this.customizable = customizable; 
    } 

    public String getUploadable_files() { 
     return uploadable_files; 
    } 

    public void setUploadable_files(String uploadable_files) { 
     this.uploadable_files = uploadable_files; 
    } 

    public String getText_fields() { 
     return text_fields; 
    } 

    public void setText_fields(String text_fields) { 
     this.text_fields = text_fields; 
    } 

    public String getActive() { 
     return active; 
    } 

    public void setActive(String active) { 
     this.active = active; 
    } 

    public String getRedirect_type() { 
     return redirect_type; 
    } 

    public void setRedirect_type(String redirect_type) { 
     this.redirect_type = redirect_type; 
    } 

    public String getId_product_redirected() { 
     return id_product_redirected; 
    } 

    public void setId_product_redirected(String id_product_redirected) { 
     this.id_product_redirected = id_product_redirected; 
    } 

    public String getAvailable_for_order() { 
     return available_for_order; 
    } 

    public void setAvailable_for_order(String available_for_order) { 
     this.available_for_order = available_for_order; 
    } 

    public String getAvailable_date() { 
     return available_date; 
    } 

    public void setAvailable_date(String available_date) { 
     this.available_date = available_date; 
    } 

    public String getCondition() { 
     return condition; 
    } 

    public void setCondition(String condition) { 
     this.condition = condition; 
    } 

    public String getShow_price() { 
     return show_price; 
    } 

    public void setShow_price(String show_price) { 
     this.show_price = show_price; 
    } 

    public String getIndexed() { 
     return indexed; 
    } 

    public void setIndexed(String indexed) { 
     this.indexed = indexed; 
    } 

    public String getVisibility() { 
     return visibility; 
    } 

    public void setVisibility(String visibility) { 
     this.visibility = visibility; 
    } 

    public String getCache_is_pack() { 
     return cache_is_pack; 
    } 

    public void setCache_is_pack(String cache_is_pack) { 
     this.cache_is_pack = cache_is_pack; 
    } 

    public String getCache_has_attachments() { 
     return cache_has_attachments; 
    } 

    public void setCache_has_attachments(String cache_has_attachments) { 
     this.cache_has_attachments = cache_has_attachments; 
    } 

    public String getIs_virtual() { 
     return is_virtual; 
    } 

    public void setIs_virtual(String is_virtual) { 
     this.is_virtual = is_virtual; 
    } 

    public String getCache_default_attribute() { 
     return cache_default_attribute; 
    } 

    public void setCache_default_attribute(String cache_default_attribute) { 
     this.cache_default_attribute = cache_default_attribute; 
    } 

    public String getDate_add() { 
     return date_add; 
    } 

    public void setDate_add(String date_add) { 
     this.date_add = date_add; 
    } 

    public String getDate_upd() { 
     return date_upd; 
    } 

    public void setDate_upd(String date_upd) { 
     this.date_upd = date_upd; 
    } 

    public String getAdvanced_stock_management() { 
     return advanced_stock_management; 
    } 

    public void setAdvanced_stock_management(String advanced_stock_management) { 
     this.advanced_stock_management = advanced_stock_management; 
    } 

    public String getPack_stock_type() { 
     return pack_stock_type; 
    } 

    public void setPack_stock_type(String pack_stock_type) { 
     this.pack_stock_type = pack_stock_type; 
    } 

    public String getId_shop() { 
     return id_shop; 
    } 

    public void setId_shop(String id_shop) { 
     this.id_shop = id_shop; 
    } 

    public int getId_product_attribute() { 
     return id_product_attribute; 
    } 

    public void setId_product_attribute(int id_product_attribute) { 
     this.id_product_attribute = id_product_attribute; 
    } 

    public String getProduct_attribute_minimal_quantity() { 
     return product_attribute_minimal_quantity; 
    } 

    public void setProduct_attribute_minimal_quantity(String product_attribute_minimal_quantity) { 
     this.product_attribute_minimal_quantity = product_attribute_minimal_quantity; 
    } 

    public String getDescription() { 
     return description; 
    } 

    public void setDescription(String description) { 
     this.description = description; 
    } 

    public String getDescription_short() { 
     return description_short; 
    } 

    public void setDescription_short(String description_short) { 
     this.description_short = description_short; 
    } 

    public String getAvailable_now() { 
     return available_now; 
    } 

    public void setAvailable_now(String available_now) { 
     this.available_now = available_now; 
    } 

    public String getAvailable_later() { 
     return available_later; 
    } 

    public void setAvailable_later(String available_later) { 
     this.available_later = available_later; 
    } 

    public String getLink_rewrite() { 
     return link_rewrite; 
    } 

    public void setLink_rewrite(String link_rewrite) { 
     this.link_rewrite = link_rewrite; 
    } 

    public String getMeta_description() { 
     return meta_description; 
    } 

    public void setMeta_description(String meta_description) { 
     this.meta_description = meta_description; 
    } 

    public String getMeta_keywords() { 
     return meta_keywords; 
    } 

    public void setMeta_keywords(String meta_keywords) { 
     this.meta_keywords = meta_keywords; 
    } 

    public String getMeta_title() { 
     return meta_title; 
    } 

    public void setMeta_title(String meta_title) { 
     this.meta_title = meta_title; 
    } 

    public String getName() { 
     return name; 
    } 

    public void setName(String name) { 
     this.name = name; 
    } 

    public String getId_image() { 
     return id_image; 
    } 

    public void setId_image(String id_image) { 
     this.id_image = id_image; 
    } 

    public String getLegend() { 
     return legend; 
    } 

    public void setLegend(String legend) { 
     this.legend = legend; 
    } 

    public String getManufacturer_name() { 
     return manufacturer_name; 
    } 

    public void setManufacturer_name(String manufacturer_name) { 
     this.manufacturer_name = manufacturer_name; 
    } 

    public String getCategory_default() { 
     return category_default; 
    } 

    public void setCategory_default(String category_default) { 
     this.category_default = category_default; 
    } 

    public String getNewX() { 
     return newX; 
    } 

    public void setNewX(String newX) { 
     this.newX = newX; 
    } 

    public String getOrderprice() { 
     return orderprice; 
    } 

    public void setOrderprice(String orderprice) { 
     this.orderprice = orderprice; 
    } 

    public int getAllow_oosp() { 
     return allow_oosp; 
    } 

    public void setAllow_oosp(int allow_oosp) { 
     this.allow_oosp = allow_oosp; 
    } 

    public String getCategory() { 
     return category; 
    } 

    public void setCategory(String category) { 
     this.category = category; 
    } 

    public String getLink() { 
     return link; 
    } 

    public void setLink(String link) { 
     this.link = link; 
    } 

    public int getAttribute_price() { 
     return attribute_price; 
    } 

    public void setAttribute_price(int attribute_price) { 
     this.attribute_price = attribute_price; 
    } 

    public double getPrice_tax_exc() { 
     return price_tax_exc; 
    } 

    public void setPrice_tax_exc(double price_tax_exc) { 
     this.price_tax_exc = price_tax_exc; 
    } 

    public double getPrice_without_reduction() { 
     return price_without_reduction; 
    } 

    public void setPrice_without_reduction(double price_without_reduction) { 
     this.price_without_reduction = price_without_reduction; 
    } 

    public int getReduction() { 
     return reduction; 
    } 

    public void setReduction(int reduction) { 
     this.reduction = reduction; 
    } 

    public boolean isSpecific_prices() { 
     return specific_prices; 
    } 

    public void setSpecific_prices(boolean specific_prices) { 
     this.specific_prices = specific_prices; 
    } 

    public int getQuantity_all_versions() { 
     return quantity_all_versions; 
    } 

    public void setQuantity_all_versions(int quantity_all_versions) { 
     this.quantity_all_versions = quantity_all_versions; 
    } 

    public int getVirtual() { 
     return virtual; 
    } 

    public void setVirtual(int virtual) { 
     this.virtual = virtual; 
    } 

    public int getPack() { 
     return pack; 
    } 

    public void setPack(int pack) { 
     this.pack = pack; 
    } 

    public int getNopackprice() { 
     return nopackprice; 
    } 

    public void setNopackprice(int nopackprice) { 
     this.nopackprice = nopackprice; 
    } 

    public boolean isCustomization_required() { 
     return customization_required; 
    } 

    public void setCustomization_required(boolean customization_required) { 
     this.customization_required = customization_required; 
    } 

    public int getRate() { 
     return rate; 
    } 

    public void setRate(int rate) { 
     this.rate = rate; 
    } 

    public String getTax_name() { 
     return tax_name; 
    } 

    public void setTax_name(String tax_name) { 
     this.tax_name = tax_name; 
    } 

    public String getImage_url() { 
     return image_url; 
    } 

    public void setImage_url(String image_url) { 
     this.image_url = image_url; 
    } 

    public List<?> getFeatures() { 
     return features; 
    } 

    public void setFeatures(List<?> features) { 
     this.features = features; 
    } 

    public List<?> getAttachments() { 
     return attachments; 
    } 

    public void setAttachments(List<?> attachments) { 
     this.attachments = attachments; 
    } 

    public List<?> getPackItems() { 
     return packItems; 
    } 

    public void setPackItems(List<?> packItems) { 
     this.packItems = packItems; 
    } 
} 

list_main_item.java（主な活動）：

package com.example.madrit.okhttp_gson_view; 

import android.os.Handler; 
import android.os.Looper; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.util.Log; 
import android.widget.ListAdapter; 
import android.widget.ListView; 

import com.google.gson.Gson; 

import java.io.IOException; 
import java.util.Arrays; 
import java.util.List; 

import okhttp3.Call; 
import okhttp3.Callback; 
import okhttp3.OkHttpClient; 
import okhttp3.Request; 
import okhttp3.Response; 

public class list_main_item extends AppCompatActivity { 
private ListView listview; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     listview = (ListView) findViewById(R.id.item_shop_list_view); 
     String url = "http://77.242.25.43:8080/girogama/modules/api/mApi/v1/categories.php?action=get_products&id_category=6&page=1&products_per_page=15"; 
     OkHttpClient client = new OkHttpClient(); 
     Request request = new Request.Builder().url(url).build(); 
      client.newCall(request).enqueue(new Callback() { 
      @Override 
      public void onFailure(Call call, IOException e) { 

      } 

      @Override 
      public void onResponse(Call call, Response response) throws IOException { 
       String json = response.body().string(); 
       Gson gson = new Gson(); 
       model_item[] model = gson.fromJson(json , model_item[].class); 
       List<model_item> list = Arrays.asList(model); 
       final ListAdapter myadapter = new CustomItemAdapter(list_main_item.this,list); 
       new Handler(Looper.getMainLooper()).post(new Runnable() { 
        @Override 
        public void run() { 
         listview.setAdapter(myadapter); 
         Log.i("Item_shop_activity"," te dhenat e response"); 
        } 
       }); 

      } 
     }); 
     setContentView(R.layout.activity_list__main_item); 
    } 
} 

ここに私のコードです

私のメインのXMLファイルactivity_list_main_item.xml

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:id="@+id/activity_item_shop" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    tools:context="com.example.madrit.okhttp_gson_view.list_main_item"> 
    <ListView 
     android:id="@+id/item_shop_list_view" 
     android:layout_width="wrap_content" 
     android:layout_height="match_parent"> 
    </ListView> 
</RelativeLayout> 

エラー the error it gaved me 私は、データの解析と他の愚かなエラーを行っている場合でも、助けを必要としてください！

Answer 1

super.onCreate(savedInstanceState);の直後または任意のビューの割り当て/アクセス前にsetContentView(R.layout.activity_list__main_item);を呼び出します。