android中的动态标签，带有来自json的动态内容

Posted 2023-04-18

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【中文标题】android中的动态标签，带有来自json的动态内容【英文标题】：Dyanamic tabs in android with dynamic content from json 【发布时间】：2016-11-06 09:13:00 【问题描述】：

我在 android 中创建动态选项卡，其中选项卡的数据是从 json 填充的

下面是json响应

    
  "shop_details": [
    
      "id": "36",
      "shop_name": "All in One Mart",
      "shop_no": "23223",
      "shop_address": "Tinkune",
      "phone": "9804966595",
      "email": "arjundangal4@gmail.com",
      "user_name": "arjun",
      "address": "",
      "tel": "",
      "fax": "",
      "facebook": "",
      "twitter": "",
      "googleplus": "",
      "image": "",
      "featured_image": ""
    
  ],
  "category": [
    
      "category_id": "35",
      "category_name": "Skirt",
      "product": [
        
          "product_id": "49",
          "product_name": "Skirt",
          "category_id": "35",
          "subcategory_id": "37",
          "product_color": "blue",
          "description": "Skirt for girls",
          "price": "301",
          "discount": "0",
          "service_charge": "0",
          "user_id": "36",
          "image_name": "6baab8a5308b7e821f5b6387794979a4.jpeg",
          "created_at": "2016-07-04 03:54:54"
        
      ]
    ,
    
      "category_id": "36",
      "category_name": "Men",
      "product": [
        
          "product_id": "48",
          "product_name": "Glasses",
          "category_id": "36",
          "subcategory_id": "39",
          "product_color": "red",
          "description": "Glasses of Rayban",
          "price": "594",
          "discount": "23",
          "service_charge": "22",
          "user_id": "36",
          "image_name": "fce01420a9021fdb159226b4bdc5b591.jpg",
          "created_at": "2016-07-04 03:52:58"
        
      ]
    ,
    
      "category_id": "37",
      "category_name": "Bags",
      "product": [
        
          "product_id": "50",
          "product_name": "Laptop bag",
          "category_id": "37",
          "subcategory_id": "41",
          "product_color": "black",
          "description": "Bag to carry laptop",
          "price": "190",
          "discount": "2",
          "service_charge": "3",
          "user_id": "36",
          "image_name": "e836e090a54cd2b6b594fa0a3382bb38.jpg",
          "created_at": "2016-07-04 04:14:08"
        
      ]
    
  ]

以下是获取动态添加标签的代码

 private void getShopDetails() 
    coordinatorLayout.setVisibility(View.GONE);
    new ProgressDialog(this);
    ProgressDialog.show();

    JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(shopDetailsJsonUrl, new Response.Listener<JSONObject>() 
        @Override
        public void onResponse(JSONObject response) 
            ProgressDialog.dismiss();
            coordinatorLayout.setVisibility(View.VISIBLE);

            try 
                JSONArray shopDetailsArray = response.getJSONArray("shop_details");
                JSONObject shopDetailsObj = shopDetailsArray.getJSONObject(0);
                shopName = shopDetailsObj.getString("shop_name");

                phone = shopDetailsObj.getString("tel");
                shopNum = shopDetailsObj.getString("shop_no");
                shopAddress = shopDetailsObj.getString("shop_address");
                shopImage = shopDetailsObj.getString("featured_image");
                Glide.with(getApplicationContext()).load("http://allmartapp.com/appapi/uploads/" + shopImage).diskCacheStrategy(DiskCacheStrategy.SOURCE).into(backdrop);
                colLayout.setTitle(shopName);

                address.setText("Address - Shop no -" + shopNum + ", " + shopAddress);

                JSONArray tabsArray = response.getJSONArray("category");

                categoryId = new int[tabsArray.length()];

                for (int i = 0; i < tabsArray.length(); i++) 

                    JSONObject tabsObj = tabsArray.getJSONObject(i);
                    tabLayout.addTab(tabLayout.newTab().setText(tabsObj.getString("category_name")));
                    categoryId[i] = tabsObj.getInt("category_id");

                

                tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
                PagerAdapter pagerAdapter = new PagerAdapter(getSupportFragmentManager(), tabLayout.getTabCount());
                 pager.setAdapter(pagerAdapter);
                pager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));

                tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() 
                    @Override
                    public void onTabSelected(TabLayout.Tab tab) 
                        pager.setCurrentItem(tab.getPosition());
                        ShopDetailsTabsFragment.sgetid(categoryId[tab.getPosition()]);
                        Log.d("CATIID", categoryId[tab.getPosition()] + "");

                    

                    @Override
                    public void onTabUnselected(TabLayout.Tab tab) 

                    

                    @Override
                    public void onTabReselected(TabLayout.Tab tab) 

                    
                );


             catch (JSONException e) 
                e.printStackTrace();
            


        
    , new Response.ErrorListener() 
        @Override
        public void onErrorResponse(VolleyError error) 
            ProgressDialog.dismissWithError();
        
    );

    int socketTimeout = 30000;//30 seconds - change to what you want
    RetryPolicy policy = new DefaultRetryPolicy(socketTimeout, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT);
    jsonObjectRequest.setRetryPolicy(policy);
    AppController.getInstance().addToRequestQueue(jsonObjectRequest);

在 ontabselected() 中，我根据选项卡的位置分配了类别 ID，并调用了片段中的 sgetid() 函数

我的 pageradapter 只返回一个带有 recyclerview 的 Fragment。以下是片段代码

public class ShopDetailsTabsFragment extends Fragment 
RecyclerView recyclerView;
boolean isViewShown = false;
CategoryListItemsAdapter shopListRvAdapters;

private String shopDetailsJsonUrl = "http://allmartapp.com/appapi/json/get_shop_details_by_shop_id/";

private String baseshopDetailsJsonUrl = "http://allmartapp.com/appapi/json/get_shop_details_by_shop_id/";

ArrayList<CategoryItemsListModel> arrayList = new ArrayList<>();
static int catid = 0;
int shopId;

public ShopDetailsTabsFragment() 
    // Required empty public constructor



@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) 
    // Inflate the layout for this fragment
    View v = inflater.inflate(R.layout.fragment_shop_details_tabs, container, false);
    recyclerView = (RecyclerView) v.findViewById(R.id.rv);
    recyclerView.setLayoutManager(new GridLayoutManager(getActivity(), 2));

    SharedPreferences sharedPreferences = getActivity().getSharedPreferences("SHOPID", Context.MODE_PRIVATE);
    shopId = sharedPreferences.getInt("shopid", 0);

    return v;




@Override
public void setUserVisibleHint(boolean isVisibleToUser) 
    super.setUserVisibleHint(isVisibleToUser);
    if (getView() != null) 
        isViewShown = true;
        getShopCat();

        // fetchdata() contains logic to show data when page is selected mostly asynctask to fill the data
     else 
        isViewShown = false;
    


public static void sgetid(int cat) 
    catid = cat;



private void getShopCat() 
    recyclerView.setAdapter(null);
    shopDetailsJsonUrl += shopId;
    arrayList.clear();
    JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(shopDetailsJsonUrl, new Response.Listener<JSONObject>() 
        @Override
        public void onResponse(JSONObject response) 
            Log.d("JSON", response.toString());

            try 
                JSONArray categoryArray = response.getJSONArray("category");

                for (int i = 0; i < categoryArray.length(); i++) 
                    JSONObject catObj = categoryArray.getJSONObject(i);

                    int category_id = catObj.getInt("category_id");

                    if (category_id == catid) 

                        JSONArray productArray = catObj.getJSONArray("product");

                        for (int j = 0; j < productArray.length(); j++) 
                            JSONObject productObj = productArray.getJSONObject(j);

                            String name = productObj.getString("product_name");
                            String image = productObj.getString("image_name");
                            int id = productObj.getInt("product_id");
                            int price = productObj.getInt("product_id");


                            CategoryItemsListModel shopListRvModels = new CategoryItemsListModel(id, image, name, price);
                            arrayList.add(shopListRvModels);
                            shopListRvAdapters = new CategoryListItemsAdapter(arrayList, getActivity());
                            recyclerView.setAdapter(shopListRvAdapters);
                            shopListRvAdapters.notifyDataSetChanged();
                        
                    

                


             catch (JSONException e) 
                e.printStackTrace();
            


        
    , new Response.ErrorListener() 
        @Override
        public void onErrorResponse(VolleyError error) 

        
    );

    int socketTimeout = 30000;//30 seconds - change to what you want
    RetryPolicy policy = new DefaultRetryPolicy(socketTimeout, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT);
    jsonObjectRequest.setRetryPolicy(policy);
    AppController.getInstance().addToRequestQueue(jsonObjectRequest);
    shopDetailsJsonUrl = baseshopDetailsJsonUrl;

我的问题是，标签显示出奇怪的行为。我知道获取类别列表的逻辑是正确的。但我认为片段的状态存在问题。当我切换选项卡时，有时会重复加载选项卡中的数据，甚至有时会加载两次数据。任何建议都会受到赞赏，因为我会在几天内面临这个问题。我想知道在选项卡中加载数据的简单方法。

【问题讨论】：

我也遇到了同样的问题，请问你是怎么解决的 【参考方案1】：

如果有帮助，试试下面的代码：

public class ShopDetailsTabsFragment extends Fragment 
RecyclerView recyclerView;
boolean isViewShown = false;
CategoryListItemsAdapter shopListRvAdapters;

private String shopDetailsJsonUrl = "http://allmartapp.com/appapi/json/get_shop_details_by_shop_id/";

private String baseshopDetailsJsonUrl = "http://allmartapp.com/appapi/json/get_shop_details_by_shop_id/";

ArrayList<CategoryItemsListModel> arrayList = new ArrayList<>();
static int catid = 0;
int shopId;

public ShopDetailsTabsFragment() 
    // Required empty public constructor



@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) 
    // Inflate the layout for this fragment
    View v = inflater.inflate(R.layout.fragment_shop_details_tabs, container, false);
    recyclerView = (RecyclerView) v.findViewById(R.id.rv);
    recyclerView.setLayoutManager(new GridLayoutManager(getActivity(), 2));

    SharedPreferences sharedPreferences = getActivity().getSharedPreferences("SHOPID", Context.MODE_PRIVATE);
    shopId = sharedPreferences.getInt("shopid", 0);

    shopListRvAdapters = new CategoryListItemsAdapter(arrayList, getActivity());
    recyclerView.setAdapter(shopListRvAdapters);


    return v;




@Override
public void setUserVisibleHint(boolean isVisibleToUser) 
    super.setUserVisibleHint(isVisibleToUser);
    if (getView() != null) 
        isViewShown = true;
        getShopCat();

        // fetchdata() contains logic to show data when page is selected mostly asynctask to fill the data
     else 
        isViewShown = false;
    


public static void sgetid(int cat) 
    catid = cat;



private void getShopCat() 
    recyclerView.setAdapter(null);
    shopDetailsJsonUrl += shopId;
    arrayList.clear();
    JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(shopDetailsJsonUrl, new Response.Listener<JSONObject>() 
        @Override
        public void onResponse(JSONObject response) 
            Log.d("JSON", response.toString());

            try 
                JSONArray categoryArray = response.getJSONArray("category");

                if(arrayList!=null)
                    if(arrayList.size()>0)
                        arrayList.clear();
                

                for (int i = 0; i < categoryArray.length(); i++) 
                    JSONObject catObj = categoryArray.getJSONObject(i);

                    int category_id = catObj.getInt("category_id");

                    if (category_id == catid) 

                        JSONArray productArray = catObj.getJSONArray("product");

                        for (int j = 0; j < productArray.length(); j++) 
                            JSONObject productObj = productArray.getJSONObject(j);

                            String name = productObj.getString("product_name");
                            String image = productObj.getString("image_name");
                            int id = productObj.getInt("product_id");
                            int price = productObj.getInt("product_id");

                            arrayList.add(new CategoryItemsListModel(id, image, name, price));

                        

                        shopListRvAdapters.notifyDataSetChanged();

                    

                


             catch (JSONException e) 
                e.printStackTrace();
            


        
    , new Response.ErrorListener() 
        @Override
        public void onErrorResponse(VolleyError error) 

        
    );

    int socketTimeout = 30000;//30 seconds - change to what you want
    RetryPolicy policy = new DefaultRetryPolicy(socketTimeout, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT);
    jsonObjectRequest.setRetryPolicy(policy);
    AppController.getInstance().addToRequestQueue(jsonObjectRequest);
    shopDetailsJsonUrl = baseshopDetailsJsonUrl;

【讨论】：

如何保存每个标签页的数据，这样每次显示标签页都不需要json请求？？你可以保留一些像 isDataLoadedOnce=false 这样的标志，并在你第一次得到响应时让它为真，如果只有标志为假，则每次加载数据。但在这种情况下，注释掉 if(arrayList !=null) if(arrayList.size()>0) arrayList.clear();

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