我如何将 recyclerview 放入另一个数据来自 retrofit 2

Question

我是这些服务器处理方面的新手，我需要很大的帮助。我在 android 中有两个 recyclerviews。一个用于类别，另一个用于项目。我想用 recyclerview 将项目放在类别下。所以，我通过改造 2 获得了所有数据。我能够获得项目数据，但数据来晚了，我无法在类别下看到。我该如何解决。请帮我解决这个问题？谢谢。

这是我的代码：

urunAdapter

public class UrunAdapter extends RecyclerView.Adapter<UrunAdapter.UrunlerViewHolder> {

    private Context context;
    private List<UrunListe> urun;
    private SelectedUrun selectedUrun;
    private int urunListeSize;

    public UrunAdapter(Context context, List<UrunListe> urun, SelectedUrun selectedUrun, int urunListeSize) {
        this.context = context;
        this.urun = urun;
        this.selectedUrun = selectedUrun;
        this.urunListeSize = urunListeSize;
    }

    @NonNull
    @Override
    public UrunlerViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

        View view = LayoutInflater.from(context).inflate(R.layout.item_products, parent, false);

        return new UrunlerViewHolder(view);
    }

    public interface SelectedUrun {
        void onSelectedUrun(int index);
    }

    @SuppressLint("SetTextI18n")
    @Override
    public void onBindViewHolder(@NonNull UrunlerViewHolder holder, int position) {
        UrunListe urunListe = urun.get(position);

        holder.urunAdi.setText(urunListe.getId() + " - " + urunListe.getUrunAdi());
        holder.urunTutar.setText( urunListe.getTutar());

    }


    @Override
        public int getItemCount() {
            return urunListeSize;
        }

        public class UrunlerViewHolder extends RecyclerView.ViewHolder{

            private TextView urunAdi,  urunTutar;
        private ImageView btnAdd;

        public UrunlerViewHolder(@NonNull View itemView) {
            super(itemView);

            urunAdi = itemView.findViewById(R.id.urunAdi);
            urunTutar = itemView.findViewById(R.id.urunTutar);
            btnAdd = itemView.findViewById(R.id.btnAdd);

            btnAdd.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {

                    selectedUrun.onSelectedUrun(getLayoutPosition());
                }
            });

        }
    }
}

这是类别适配器

public class CategoryAdapter extends RecyclerView.Adapter<CategoryAdapter.CategoryAdapterViewHolder> implements UrunAdapter.SelectedUrun  {

    private Context context ;
    private List<Categories> categoriesList;
    private  Categories categories;
    private List<UrunListe> urunListes = new ArrayList<>();

    private UrunAdapter rvUrunAdapter;
    private RestInterface restInterface = ServiceGenerator.createService(RestInterface.class);

    public CategoryAdapter(Context context, List<Categories> categoriesList) {
        this.context = context;
        this.categoriesList = categoriesList;
    }

    @NonNull
    @Override
    public CategoryAdapterViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

        View view = LayoutInflater.from(context).inflate(R.layout.categories, parent, false);

        return new CategoryAdapterViewHolder(view);
    }

    private void createSubCategories(Context context1, int catId, int position){

        try {
            if (restInterface == null) {
                restInterface = ServiceGenerator.createService(RestInterface.class);
            }
        }catch (Exception e){
            Log.d("TAG apiCall", e.getMessage());
        }

        context=context1;

        String hash = "some hash";

        Call<UrunListe[]> call = restInterface.getUrunler(hash, catId);

        String url = call.request().url().toString();
        Log.i("TAG Kategoriler",url);
        call.enqueue(new Callback<UrunListe[]>() {

            @Override
            public void onResponse(Call<UrunListe[]> call, Response<UrunListe[]> response) {

                if (response.isSuccessful()){
                    urunListes = Arrays.asList(response.body());

                    Log.d("TAG apiCall", response.message());
                    Log.d("TAG apiCall", "OK ürünler");

                   // categories.setUrunListeList(urunListes);

                }
            }

            @Override
            public void onFailure(Call<UrunListe[]> call, Throwable t) {
                Log.d("TAG apiCall", "FAIL");
                Log.d("TAG apiCall", t.getMessage());
            }
        });

    }

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

        categories = categoriesList.get(position);

        createSubCategories(context, categories.getId(), position);

        categories.setUrunListeList(urunListes);

        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(context);
        linearLayoutManager.setOrientation(RecyclerView.VERTICAL);
        holder.rvSubCategories.setLayoutManager(linearLayoutManager);
        holder.rvSubCategories.hasFixedSize();
        rvUrunAdapter = new UrunAdapter(context, categories.getUrunListeList(), this::onSelectedUrun, urunListes.size());

        holder.txtHeader.setText(categories.getCategoryName());
        holder.rvSubCategories.setAdapter(rvUrunAdapter);

        rvUrunAdapter.notifyDataSetChanged();

    }

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

    @Override
    public void onSelectedUrun(int index) {
        Toast.makeText(context, "Seçilen ürün "+ urunListes.get(index).getId()  + urunListes.get(index).getUrunAdi() , Toast.LENGTH_SHORT).show();
    }

    public class CategoryAdapterViewHolder extends RecyclerView.ViewHolder {

        private TextView txtHeader;
        private RecyclerView rvSubCategories;

        public CategoryAdapterViewHolder(@NonNull View itemView) {
            super(itemView);

            txtHeader = itemView.findViewById(R.id.txtHeader);
            rvSubCategories = itemView.findViewById(R.id.rvSubCategories);

        }
    }
}

型号class

public class UrunListe {

    @SerializedName("id")
    @Expose
    private int id;

    @SerializedName("parentCatId")
    @Expose
    private int parentCatId;

    @SerializedName("urunAdi")
    @Expose
    private String urunAdi ;

    @SerializedName("adet")
    @Expose
    private int adet;

    @SerializedName("ucret")
    @Expose
    private String tutar;

    @SerializedName("aktif")
    @Expose
    private int aktif;
}

public class Categories {

    @SerializedName("id")
    @Expose
    private int id;

    @SerializedName("kategori_adi")
    @Expose
    private String categoryName;

    private List<UrunListe> urunListeList;
}

@GET("getKategoriler")
    Call<Categories[]> getKategoriler(@Query(value = "hash",encoded = true) String hash );

    @GET("getUrunler")
    Call<UrunListe[]> getUrunler(@Query(value = "hash",encoded = true) String hash,
                                 @Query(value = "parentCatId",encoded = true) int parentCatId);

这些是asp.net服务器端


 #region getUrunler
        [WebMethod]
        [ScriptMethod(ResponseFormat = ResponseFormat.Json)]
        public void getUrunler()
        {
            HttpContext context = HttpContext.Current;
            context.Response.Clear();
            context.Response.ClearHeaders();
            context.Response.ClearContent();
            context.Response.Cache.SetCacheability(HttpCacheability.NoCache);
            context.Response.ContentType = "application/json";
            context.Response.Charset = Encoding.UTF8.WebName;
            context.Response.ContentEncoding = Encoding.UTF8;
            context.Response.BinaryWrite(Encoding.UTF8.GetPreamble());

            try
            {
                string hash = null;
                hash = temizle(context.Request.QueryString["hash"]);

                string parentCatId = null;

                try
                {
                    parentCatId = temizle(context.Request.QueryString["parentCatId"]);
                }
                catch { }



                if (hash == "some hash")
                {

                    DbCon dbCon = new DbCon();

                    DataTable dt = null;

                    try
                    {
                        dt = dbCon.getDataTable("select * from urun_liste where aktif=1 and parentCatId =" + parentCatId);
                    }
                    catch
                    {
                        dt = dbCon.getDataTable("select * from urun_liste");
                    }

                  

                    JavaScriptSerializer jss = new JavaScriptSerializer(); jss.MaxJsonLength = 2147483644;
                    List<Dictionary<string, object>> rows = new List<Dictionary<string, object>>();
                    Dictionary<string, object> row;

                    foreach (DataRow dr in dt.Rows)
                    {
                        row = new Dictionary<string, object>();

                        foreach (DataColumn col in dt.Columns)
                        {

                            row.Add(col.ColumnName, dr[col].ToString());
                        }
                        rows.Add(row);
                    }


                    context.Response.Write(jss.Serialize(rows));
                    //return jss.Serialize(rowRoot);
                }
                else
                {

                    HttpContext.Current.Response.Write("Bilgileriniz kayit edildi. IP Adresiniz : " + KullaniciIP() + " Tekrari halinde hakkinizda yasal islem baslatilacaktir.");
                }
            }
            catch
            {

                HttpContext.Current.Response.Write("Bilgileriniz kayit edildi. IP Adresiniz : " + KullaniciIP() + " Tekrari halinde hakkinizda yasal islem baslatilacaktir.");
            }
        }
        #endregion

        #region getKategoriler
        [WebMethod]
        [ScriptMethod(ResponseFormat = ResponseFormat.Json)]
        public void getKategoriler()
        {
            HttpContext context = HttpContext.Current;
            context.Response.Clear();
            context.Response.ClearHeaders();
            context.Response.ClearContent();
            context.Response.Cache.SetCacheability(HttpCacheability.NoCache);
            context.Response.ContentType = "application/json";
            context.Response.Charset = Encoding.UTF8.WebName;
            context.Response.ContentEncoding = Encoding.UTF8;
            context.Response.BinaryWrite(Encoding.UTF8.GetPreamble());

            try
            {
                string hash = null;
                hash = temizle(context.Request.QueryString["hash"]);


                if (hash == "some hash")
                {

                    DbCon dbCon = new DbCon();

                    DataTable dt = null;

                    dt = dbCon.getDataTable("select * from kategoriler");

                    JavaScriptSerializer jss = new JavaScriptSerializer(); jss.MaxJsonLength = 2147483644;
                    List<Dictionary<string, object>> rows = new List<Dictionary<string, object>>();
                    Dictionary<string, object> row;

                    foreach (DataRow dr in dt.Rows)
                    {
                        row = new Dictionary<string, object>();

                        foreach (DataColumn col in dt.Columns)
                        {

                            row.Add(col.ColumnName, dr[col].ToString());
                        }
                        rows.Add(row);
                    }


                    context.Response.Write(jss.Serialize(rows));
                    //return jss.Serialize(rowRoot);
                }
                else
                {

                    HttpContext.Current.Response.Write("Bilgileriniz kayit edildi. IP Adresiniz : " + KullaniciIP() + " Tekrari halinde hakkinizda yasal islem baslatilacaktir.");
                }
            }
            catch
            {

                HttpContext.Current.Response.Write("Bilgileriniz kayit edildi. IP Adresiniz : " + KullaniciIP() + " Tekrari halinde hakkinizda yasal islem baslatilacaktir.");
            }
        }
        #endregion

Answer 1

Firstly, You should change your UrunAdapter.getItemCount() 到 return urun.size() 而不是 urunListeSize。这样就容易同步了。

您需要在回调中调用notifyDataSetChanged()。不传递 categories.getId()，而是传递类别 object。您还应该传递项目适配器。改造一旦检索到数据，就会更新 categories.urunListeList 并通过适配器通知数据集已更改。

onBindViewHolder代码

@Override
public void onBindViewHolder(@NonNull CategoryAdapterViewHolder holder, int position) {
    categories = categoriesList.get(position);

    categories.setUrunListeList(new ArrayList<UrunListe>());

    LinearLayoutManager linearLayoutManager = new LinearLayoutManager(context);
    linearLayoutManager.setOrientation(RecyclerView.VERTICAL);
    holder.rvSubCategories.setLayoutManager(linearLayoutManager);
    holder.rvSubCategories.hasFixedSize();
    rvUrunAdapter = new UrunAdapter(context, categories.getUrunListeList(), this::onSelectedUrun, urunListes.size());

    holder.txtHeader.setText(categories.getCategoryName());
    holder.rvSubCategories.setAdapter(rvUrunAdapter);

    //rvUrunAdapter.notifyDataSetChanged();
    //This is not required.

    createSubCategories(context, categories, rvUrunAdapter, position);

}

相应地更改 'createSubCategories' 方法的 header。

private void createSubCategories(Context context1, Categories catId, UrunAdapter urunAdapter, int position)

最后修改onResponse代码。此处不应将回调结果分配给 categories.urunListeList。相反，你应该追加。

@Override

        public void onResponse(Call<UrunListe[]> call, Response<UrunListe[]> response) {

            if (response.isSuccessful()){
                 List<UrunListe> tempList = Arrays.asList(response.body());
                  //If you are planning to refresh this data, you should clear it first.
                urunListeList.clear();
                for(UrunListe urunListe:templist)                    
                    categories.urunListeList.add(urunListe);

                Log.d("TAG apiCall", response.message());
                Log.d("TAG apiCall", "OK ürünler");

               urunAdapter.notifyDataSetChanged();

            }
        }

我如何将 recyclerview 放入另一个数据来自 retrofit 2

How can i put a recyclerview into another with data comes from retrofit 2

android

android-recyclerview

retrofit2