JSON (POJO) model response

JSON (POJO) model response - android

I have a problem with response model for my JSON.
I'm working with hitbtc API: https://api.hitbtc.com/api/2/public/currency.
When I convert this file to POJO model, I Have only this file:
public class Currency {
#SerializedName("id")
#Expose
private String id;
#SerializedName("fullName")
#Expose
private String fullName;
#SerializedName("crypto")
#Expose
private Boolean crypto;
#SerializedName("payinEnabled")
#Expose
private Boolean payinEnabled;
#SerializedName("payinPaymentId")
#Expose
private Boolean payinPaymentId;
#SerializedName("payinConfirmations")
#Expose
private Integer payinConfirmations;
#SerializedName("payoutEnabled")
#Expose
private Boolean payoutEnabled;
#SerializedName("payoutIsPaymentId")
#Expose
private Boolean payoutIsPaymentId;
#SerializedName("transferEnabled")
#Expose
private Boolean transferEnabled;
#SerializedName("delisted")
#Expose
private Boolean delisted;
#SerializedName("payoutFee")
#Expose
private String payoutFee;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getFullName() {
return fullName;
}
public void setFullName(String fullName) {
this.fullName = fullName;
}
public Boolean getCrypto() {
return crypto;
}
public void setCrypto(Boolean crypto) {
this.crypto = crypto;
}
public Boolean getPayinEnabled() {
return payinEnabled;
}
public void setPayinEnabled(Boolean payinEnabled) {
this.payinEnabled = payinEnabled;
}
public Boolean getPayinPaymentId() {
return payinPaymentId;
}
public void setPayinPaymentId(Boolean payinPaymentId) {
this.payinPaymentId = payinPaymentId;
}
public Integer getPayinConfirmations() {
return payinConfirmations;
}
public void setPayinConfirmations(Integer payinConfirmations) {
this.payinConfirmations = payinConfirmations;
}
public Boolean getPayoutEnabled() {
return payoutEnabled;
}
public void setPayoutEnabled(Boolean payoutEnabled) {
this.payoutEnabled = payoutEnabled;
}
public Boolean getPayoutIsPaymentId() {
return payoutIsPaymentId;
}
public void setPayoutIsPaymentId(Boolean payoutIsPaymentId) {
this.payoutIsPaymentId = payoutIsPaymentId;
}
public Boolean getTransferEnabled() {
return transferEnabled;
}
public void setTransferEnabled(Boolean transferEnabled) {
this.transferEnabled = transferEnabled;
}
public Boolean getDelisted() {
return delisted;
}
public void setDelisted(Boolean delisted) {
this.delisted = delisted;
}
public String getPayoutFee() {
return payoutFee;
}
public void setPayoutFee(String payoutFee) {
this.payoutFee = payoutFee;
}
}
In the next step I want to get list of items, seems like here:
public class CurrencyResponse {
#SerializedName("page")
private int page;
#SerializedName("results")
private List<Currency> results;
#SerializedName("total_results")
private int totalResults;
#SerializedName("total_pages")
private int totalPages;
public int getPage() {
return page;
}
public void setPage(int page) {
this.page = page;
}
public List<Currency> getResults() {
return results;
}
public void setResults(List<Currency> results) {
this.results = results;
}
public int getTotalResults() {
return totalResults;
}
public void setTotalResults(int totalResults) {
this.totalResults = totalResults;
}
public int getTotalPages() {
return totalPages;
}
public void setTotalPages(int totalPages) {
this.totalPages = totalPages;
}
}
When I'm trying to make Adapter and display my list of currencies (for now I need the only name of currencies in listview), I've received nullPointException.
I know that somewhere I make a categorical mistake, but I still have little experience in RESTfull API.
If you have any tips and you could help me, I will be very glad.
EDIT:
CurrenciesAdapter.java:
public class CurrenciesAdapter extends
RecyclerView.Adapter<CurrenciesAdapter.CurrencyViewHolder> {
private List<Currency> currencies;
private int rowLayout;
private Context context;
public static class CurrencyViewHolder extends RecyclerView.ViewHolder {
LinearLayout currenciesLayout;
TextView currencyTitle;
TextView data;
TextView currencyDescription;
TextView rating;
public CurrencyViewHolder(View v) {
super(v);
currenciesLayout = (LinearLayout) v.findViewById(R.id.currencies_layout);
currencyTitle = (TextView) v.findViewById(R.id.title);
data = (TextView) v.findViewById(R.id.subtitle);
currencyDescription = (TextView) v.findViewById(R.id.description);
//rating = (TextView) v.findViewById(R.id.rating);
}
}
public CurrenciesAdapter(List<Currency> currencies, int rowLayout, Context context) {
this.currencies = currencies;
this.rowLayout = rowLayout;
this.context = context;
}
#Override
public CurrenciesAdapter.CurrencyViewHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(rowLayout, parent, false);
return new CurrencyViewHolder(view);
}
#Override
public void onBindViewHolder(CurrencyViewHolder holder, final int position) {
holder.currencyTitle.setText(currencies.get(position).getFullName());
holder.data.setText(currencies.get(position).getPayoutFee());
if(currencies.get(position).getPayinEnabled()== true) {
holder.currencyDescription.setText("true");
}
else holder.currencyDescription.setText("false");
// holder.rating.setText(currencies.get(position).getVoteAverage().toString());
}
#Override
public int getItemCount() {
return currencies.size();
}
}
MainActivity.java:
public class MainActivity extends AppCompatActivity {
private static final String TAG = MainActivity.class.getSimpleName();
// TODO - insert your themoviedb.org API KEY here
private final static String API_KEY = "My_key";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (API_KEY.isEmpty()) {
Toast.makeText(getApplicationContext(), "Please obtain your API KEY from hitbtc.com first!", Toast.LENGTH_LONG).show();
return;
}
final RecyclerView recyclerView = (RecyclerView) findViewById(R.id.movies_recycler_view);
LinearLayoutManager manager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(manager);
recyclerView.setHasFixedSize(true);
ApiInterface apiService =
ApiClient.getClient().create(ApiInterface.class);
Call<CurrencyResponse> call = apiService.getCurrencies(API_KEY);
call.enqueue(new Callback<CurrencyResponse>() {
#EverythingIsNonNull
public void onResponse(Call<CurrencyResponse> call, Response<CurrencyResponse> response) {
int statusCode = response.code();
List<Currency> currencies = response.body().getResults();
recyclerView.setAdapter(new CurrenciesAdapter(currencies, R.layout.list_item_currency, getApplicationContext()));
}
#Override
public void onFailure(Call<CurrencyResponse> call, Throwable t) {
// Log error here since request failed
Log.e(TAG, t.toString());
}
});
}
}
I have NPE in 63 line in MainActivity.
Logcat:
--------- beginning of crash
2019-03-11 13:58:12.020 3325-3325/com.example.mojpierwszyrest
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.mojpierwszyrest, PID: 3325
java.lang.NullPointerException: Attempt to invoke virtual method 'java.util.List com.example.mojpierwszyrest.model.CurrencyResponse.getResults()' on a null object reference
at com.example.mojpierwszyrest.acitivity.MainActivity$1.onResponse(MainActivity.java:63)
at retrofit2.ExecutorCallAdapterFactory$ExecutorCallbackCall$1$1.run(ExecutorCallAdapterFactory.java:71)
at android.os.Handler.handleCallback(Handler.java:873)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run
(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
2019-03-11 13:58:12.563 3325-3325/com.example.mojpierwszyrest I/Process:
Sending signal. PID: 3325 SIG: 9

I checked the above link you provided in the description and I came to know that there's an array in response. so according to that you shouldn't need CurrencyResponse class. Just Currency class is enough.
In your retrofit interface, the api method should return list of currency. e.g. List<Currency> getCurrencyList(). It should work.
For NPE, probable cause should be that you are trying to access a field from these classes which is not in the api response so that the field will be null and accessing that will throw NPE. You can check stacktrace to find out which field access is throwing NPE or you can share stacktrace so that this community can help you.

Related

Android Paging with Room Database; RecyclerView: No adapter attached; skipping layout

I am using Android Paging with Room Database.I am going to fetch data using retrofit.But I am getting error No adapter attached; skipping layout.I searched a lot but dont find solution for this. Base url is working, for security reason i just hide base url.
private StoreAdapter storeAdapter;
private Store_ViewModel store_viewModel;
private RecyclerView recyclerView;
private static final String URL_DATA="https://xxxx/";
//insertion
private Store_Repository store_repository;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
store_repository=new Store_Repository(getApplication());
//adapter
storeAdapter=new StoreAdapter(getApplicationContext(), this);
//recycler
recyclerView=findViewById(R.id.recycler_store);
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getApplicationContext());
recyclerView.setLayoutManager(layoutManager);
recyclerView.setHasFixedSize(true);
store_viewModel=new ViewModelProvider(this).get(Store_ViewModel.class);
store_viewModel.pagedListLiveData.observe(this, new Observer<PagedList<StoreModel>>() {
#Override
public void onChanged(PagedList<StoreModel> storeModels) {
storeAdapter.submitList(storeModels);
recyclerView.setAdapter(storeAdapter);
}
});
getAllProducts();
}
private void getAllProducts() {
Retrofit retrofit=new Retrofit.Builder()
.baseUrl(URL_DATA)
.addConverterFactory(GsonConverterFactory.create())
.build();
//calling api
Api api=retrofit.create(Api.class);
Call<List<StoreModel>>call=api.getAllProducts();
call.enqueue(new Callback<List<StoreModel>>() {
#Override
public void onResponse(Call<List<StoreModel>> call, Response<List<StoreModel>> response) {
if (response.isSuccessful())
{
store_repository.insert(response.body());
}
}
#Override
public void onFailure(Call<List<StoreModel>> call, Throwable t) {
Toast.makeText(MainActivity.this, "Something get Wrong", Toast.LENGTH_SHORT).show();
}
});
}
This is my ViewModel Class
public class Store_ViewModel extends AndroidViewModel {
public LiveData<PagedList<StoreModel>>pagedListLiveData;
private StoreDao storeDao;
public Store_ViewModel(#NonNull Application application) {
super(application);
storeDao= StoreDatabase.getINSTANCE(application).storeDao();
pagedListLiveData=new LivePagedListBuilder<>(
storeDao.getAllItems(),5
).build();
}
}
And this is my adapter class
public class StoreAdapter extends PagedListAdapter<StoreModel,StoreAdapter.StoreViewHolder> {
private Context context;
private static Listener listener;
public StoreAdapter(Context context,Listener listener)
{
super(storeModelItemCallback);
this.context=context;
this.listener=listener;
}
#NonNull
#Override
public StoreViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
return null;
}
#Override
public void onBindViewHolder(#NonNull StoreViewHolder holder, int position) {
StoreModel storeModel=getItem(position);
holder.Product_name.setText(storeModel.getProduct_name());
holder.Product_weight.setText(storeModel.getProduct_weight());
holder.Price.setText(storeModel.getPrice());
holder.Mrp.setText(storeModel.getMrp());
}
static class StoreViewHolder extends RecyclerView.ViewHolder
{
TextView Product_name;
TextView Product_weight;
TextView Price;
TextView Mrp;
public StoreViewHolder(#NonNull View itemView) {
super(itemView);
Product_name=itemView.findViewById(R.id.product_name);
Product_weight=itemView.findViewById(R.id.product_weight);
Price=itemView.findViewById(R.id.price);
Mrp=itemView.findViewById(R.id.mrp);
//listener
itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
listener.onItemCLickListener(getAdapterPosition());
}
});
}
}
static DiffUtil.ItemCallback<StoreModel> storeModelItemCallback=new DiffUtil.ItemCallback<StoreModel>() {
#Override
public boolean areItemsTheSame(#NonNull StoreModel oldItem, #NonNull StoreModel newItem) {
return oldItem.getDatabase_id()==newItem.getDatabase_id();
}
#SuppressLint("DiffUtilEquals")
#Override
public boolean areContentsTheSame(#NonNull StoreModel oldItem, #NonNull StoreModel newItem) {
return oldItem.equals(newItem);
}
};
Json Response from Server
{"status":1,"msg":"",
"paginate":{"limit":1000,"PageNo":1},
"data":
[
{
"product_id":23234,
"product_brand_id":130,
"product_name":"Xyz"
,"product_code":"1554729666482",
"mrp":5,
"price":4,
"product_weight":1,
"product_weight_unit":"PCS"
}
,{"product_id":23244,
"product_brand_id":130,
"product_name":"Abc - 100 Gms",
"product_code":"9A","mrp":38,"price":31.94,
"product_weight":100,"product_weight_unit":"GM"}
ApiInterface
public interface Api {
#GET("/get-products")
Call<List<StoreModel>>getAllProducts();
}
Below is my StoreModel in which i am using room database fro creating tables
#Entity(tableName = "store",indices = #Index(value="product_id",unique = true))
public class StoreModel {
#PrimaryKey(autoGenerate = true)
private int database_id;
#SerializedName("product_id")
private int product_id;
#SerializedName("product_brand_id")
private int product_brand_id;
#SerializedName("product_name")
private String product_name;
#SerializedName("product_code")
private int product_code;
#SerializedName("mrp")
private int mrp;
#SerializedName("price")
private int price;
#SerializedName("product_weight")
private int product_weight;
#SerializedName("product_weight_unit")
private String product_weight_unit;
public StoreModel() {
}
public StoreModel(int product_id, int product_brand_id, String product_name, int product_code, int mrp, int price, int product_weight, String product_weight_unit) {
this.product_id = product_id;
this.product_brand_id = product_brand_id;
this.product_name = product_name;
this.product_code = product_code;
this.mrp = mrp;
this.price = price;
this.product_weight = product_weight;
this.product_weight_unit = product_weight_unit;
}
public int getProduct_id() {
return product_id;
}
public void setProduct_id(int product_id) {
this.product_id = product_id;
}
public int getProduct_brand_id() {
return product_brand_id;
}
public void setProduct_brand_id(int product_brand_id) {
this.product_brand_id = product_brand_id;
}
public String getProduct_name() {
return product_name;
}
public void setProduct_name(String product_name) {
this.product_name = product_name;
}
public int getProduct_code() {
return product_code;
}
public void setProduct_code(int product_code) {
this.product_code = product_code;
}
public int getMrp() {
return mrp;
}
public void setMrp(int mrp) {
this.mrp = mrp;
}
public int getPrice() {
return price;
}
public void setPrice(int price) {
this.price = price;
}
public int getProduct_weight() {
return product_weight;
}
public void setProduct_weight(int product_weight) {
this.product_weight = product_weight;
}
public String getProduct_weight_unit() {
return product_weight_unit;
}
public void setProduct_weight_unit(String product_weight_unit) {
this.product_weight_unit = product_weight_unit;
}
public int getDatabase_id() {
return database_id;
}
public void setDatabase_id(int database_id) {
this.database_id = database_id;
}
}
Below is Dao class
#Dao
public interface StoreDao {
#Insert(onConflict = OnConflictStrategy.REPLACE)
void insert(List<StoreModel> storeModels);
#Query("DELETE FROM store")
void deleteAll();
#Query("SELECT * FROM store ORDER BY database_id ASC")
DataSource.Factory<Integer,StoreModel>getAllItems();
}

Set recyclerView.setAdapter(storeAdapter); outside of observer because each time data is observed it will set adapter. So, adapter is attached to recyclerView only once. Like
recyclerView.setAdapter(storeAdapter);
store_viewModel.pagedListLiveData.observe(this, new Observer<PagedList<StoreModel>>() {
#Override
public void onChanged(PagedList<StoreModel> storeModels) {
storeAdapter.submitList(storeModels);
//recyclerView.setAdapter(storeAdapter);
}
});
From the API you are not getting exactly the StoreModel as response. You are getting another object which is StoreModel is a child object. You have to create resposne object like below:
public class ResponseObject{
//#SerializedName("status")
//private int status;
#SerializedName("data")
private List<StoreModel> storeModelList;
//getters and setters goes here
}
And then your interface should be like below as you are expecting
ResponseObject here
public interface Api {
#GET("/get-products")
Call<ResponseObject> getAllProducts();
}

Android Retrofit 2.1.0 Response.body() is null, status code is 404

I am trying to make a call to this api and am having difficulty as the response.body() is returning null.
http://demo.museum.vebrary.vn/api/stuff/getall
I want to get stuff name of list and show to my recyclerview.
My model:
public class SOAnswersResponse {
#SerializedName("StuffModels")
#Expose
private List<StuffModel> stuffModels = null;
public List<StuffModel> getStuffModels() {
return stuffModels;
}
public void setStuffModels(List<StuffModel> stuffModels) {
this.stuffModels = stuffModels;
}
and
public class StuffModel {
#SerializedName("STUFFID")
#Expose
private Integer sTUFFID;
#SerializedName("STUFFCODE")
#Expose
private String sTUFFCODE;
#SerializedName("STUFFNAME")
#Expose
private String sTUFFNAME;
#SerializedName("STUFFNOTE")
#Expose
private String sTUFFNOTE;
#SerializedName("STUFFORDER")
#Expose
private Integer sTUFFORDER;
#SerializedName("CUSTOMERID")
#Expose
private String cUSTOMERID;
#SerializedName("EXHIBITS")
#Expose
private List<Object> eXHIBITS = null;
Json response
{
"StuffModels":[
{
"STUFFID":2,
"STUFFCODE":"Gi",
"STUFFNAME":"Giấy",
"STUFFNOTE":"",
"STUFFORDER":2,
"CUSTOMERID":"CAMAU",
"EXHIBITS":[
]
},
ApiUtils Class
public class ApiUtils {
private ApiUtils() {
}
public static final String BASE_URL = "http://demo.museum.vebrary.vn/api/";
public static SOService getSOService() {
return RetrofitClient.getClient(BASE_URL).create(SOService.class);
}
}
Service interface
public interface SOService {
#GET("/stuff/getall")
Call<SOAnswersResponse> getAnswers();
}
RetrofitClient Class
public class RetrofitClient {
private static Retrofit retrofit = null;
public static Retrofit getClient(String baseUrl) {
if (retrofit==null) {
retrofit = new Retrofit.Builder()
.baseUrl(baseUrl)
.addConverterFactory(GsonConverterFactory.create())
.build();
}
return retrofit;
}
}
My RecyclerView adapter
public class CategogyNameRecyclerViewAdapter extends RecyclerView.Adapter<CategogyNameRecyclerViewAdapter.ViewHolder> {
private List<StuffModel> mItems;
private Context mContext;
private PostItemListener mItemListener;
public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
public TextView titleTv;
PostItemListener mItemListener;
public ViewHolder(View itemView, PostItemListener postItemListener) {
super(itemView);
titleTv = itemView.findViewById(R.id.tvListMenuCategogy);
this.mItemListener = postItemListener;
itemView.setOnClickListener(this);
}
#Override
public void onClick(View view) {
StuffModel item = getItem(getAdapterPosition());
this.mItemListener.onPostClick(item.getSTUFFID());
notifyDataSetChanged();
}
}
public CategogyNameRecyclerViewAdapter(Context context, List<StuffModel> posts, PostItemListener itemListener) {
mItems = posts;
mContext = context;
mItemListener = itemListener;
}
#Override
public CategogyNameRecyclerViewAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
Context context = parent.getContext();
LayoutInflater inflater = LayoutInflater.from(context);
View postView = inflater.inflate(R.layout.item_list_text, parent, false);
ViewHolder viewHolder = new ViewHolder(postView, this.mItemListener);
return viewHolder;
}
#Override
public void onBindViewHolder(CategogyNameRecyclerViewAdapter.ViewHolder holder, int position) {
StuffModel item = mItems.get(position);
TextView textView = holder.titleTv;
textView.setText(item.getSTUFFNAME());
}
#Override
public int getItemCount() {
return mItems.size();
}
public void updateAnswers(List<StuffModel> items) {
mItems = items;
notifyDataSetChanged();
}
private StuffModel getItem(int adapterPosition) {
return mItems.get(adapterPosition);
}
public interface PostItemListener {
void onPostClick(long id);
}
}
And my main activity
public class Testttt extends AppCompatActivity {
private CategogyNameRecyclerViewAdapter mAdapter;
private RecyclerView mRecyclerView;
private SOService mService;
#Override
protected void onCreate (Bundle savedInstanceState) {
super.onCreate( savedInstanceState );
setContentView(R.layout.test );
mService = ApiUtils.getSOService();
mRecyclerView = (RecyclerView) findViewById(R.id.rcvCategogyNameMenuTest);
mAdapter = new CategogyNameRecyclerViewAdapter(this, new ArrayList<StuffModel>(0), new CategogyNameRecyclerViewAdapter.PostItemListener() {
#Override
public void onPostClick(long id) {
Toast.makeText(Testttt.this, "Post id is" + id, Toast.LENGTH_SHORT).show();
}
});
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(layoutManager);
mRecyclerView.setAdapter(mAdapter);
mRecyclerView.setHasFixedSize(true);
RecyclerView.ItemDecoration itemDecoration = new DividerItemDecoration(this, DividerItemDecoration.VERTICAL_LIST);
mRecyclerView.addItemDecoration(itemDecoration);
loadAnswers();
}
public void loadAnswers() {
mService.getAnswers().enqueue(new Callback<SOAnswersResponse>() {
#Override
public void onResponse(Call<SOAnswersResponse> call, Response<SOAnswersResponse> response) {
Toast.makeText(Testttt.this, "333333333333333333"+response.body(), Toast.LENGTH_SHORT).show();
if(response.isSuccessful()) {
mAdapter.updateAnswers(response.body().getStuffModels());
Log.d("AnswersPresenter", "posts loaded from API");
}else {
int statusCode = response.code();
}
}
#Override
public void onFailure(Call<SOAnswersResponse> call, Throwable t) {
showErrorMessage();
Log.d("AnswersPresenter", "error loading from API");
}
});
}
public void showErrorMessage() {
Toast.makeText(this, "Error loading posts", Toast.LENGTH_SHORT).show();
}
}

The first thing that came in my mind:
Your
public static final String BASE_URL = "http://demo.museum.vebrary.vn/api/";
has a "/" at the the end and your
#GET("/stuff/getall")
Call<SOAnswersResponse> getAnswers();
starts with a "/". So there is a double backslash in the url that might leads to the 404 code. Does this solve the problem?
When i call your URL i receive XML. Maybe the API is not configured correctly?

Change your Service interface
public interface SOService {
#GET("stuff/getall")
Call<SOAnswersResponse> getAnswers();
}
it occurred because you have use start with backslash it already added in your base url

Android Studio Recyclerview use Retrofit

please help me..
i have 10 policy data on my PHP to show on recyclerview android studio using retrofit..but, when i run my emulator, the emulator just show 1 data..my plan just show PolicyNo..when i running emulator and check my log, they've said : my Number Policy Received: 10
sorry for my bad english :(
here is my policyActivity :
public class PolicyActivity extends AppCompatActivity {
private static final String TAG = PolicyActivity.class.getSimpleName();
private String policyno;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_policy);
final RecyclerView recyclerView = (RecyclerView) findViewById(R.id.policy_recycler_view);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
ApiEndPoint apiEndPoint =
ApiClient.getClient(this).create(ApiEndPoint.class);
Call<PolicyStatus> call = apiEndPoint.getPolicyNo(policyno);
call.enqueue(new Callback<PolicyStatus>() {
#Override
public void onResponse(Call<PolicyStatus> call, Response<PolicyStatus> response) {
List<PolicyNo> policyNo = response.body().getPolicyNo();
Log.d(TAG, "Number Policy Received: " + policyNo.size());
recyclerView.setAdapter(new PolicyAdapter(policyNo, R.layout.list_item_policy, getApplicationContext()));
}
#Override
public void onFailure (Call <PolicyStatus> call, Throwable t){
Log.e(TAG, t.toString());
}
});
}
}
and this is my policyadapter:
public class PolicyAdapter extends RecyclerView.Adapter<PolicyAdapter.PolicyViewHolder> {
private List<PolicyNo> policyNo;
private int rowLayout;
private Context context;
public static class PolicyViewHolder extends RecyclerView.ViewHolder{
LinearLayout policyLayout;
TextView nomorpolis;
public PolicyViewHolder (View v){
super(v);
policyLayout = (LinearLayout) v.findViewById(R.id.policy_layout);
nomorpolis = (TextView)v.findViewById(R.id.nomorpolis);
}
}
public PolicyAdapter (List<PolicyNo>policyNo, int rowLayout, Context context){
this.policyNo = policyNo;
this.context = context;
this.rowLayout = rowLayout;
}
#Override
public PolicyAdapter.PolicyViewHolder onCreateViewHolder(ViewGroup parent, int viewType){
View view= LayoutInflater.from(parent.getContext()).inflate(rowLayout, parent, false);
return new PolicyViewHolder(view);
}
#Override
public void onBindViewHolder (PolicyViewHolder holder, final int position){
holder.nomorpolis.setText(policyNo.get(position).getPolicyNo());
}
#Override
public int getItemCount() {return policyNo.size();}
}
PolicyStatus :
public class PolicyStatus {
#SerializedName("success")
#Expose
private Boolean success;
#SerializedName("PolicyNo")
#Expose
private List<PolicyNo> policyNo = null;
public Boolean getSuccess() {
return success;
}
public void setSuccess(Boolean success) {
this.success = success;
}
public List<PolicyNo> getPolicyNo() {
return policyNo;
}
public void setPolicyNo(List<PolicyNo> policyNo) {
this.policyNo = policyNo;
}
PolicyNo :
public class PolicyNo {
#SerializedName("ANO")
#Expose
private Integer aNO;
#SerializedName("PolicyNo")
#Expose
private String policyNo;
#SerializedName("ADate")
#Expose
private ADate aDate;
#SerializedName("ADATE")
#Expose
private String aDATE;
public Integer getANO() {
return aNO;
}
public void setANO(Integer aNO) {
this.aNO = aNO;
}
public String getPolicyNo() {
return policyNo;
}
public void setPolicyNo(String policyNo) {
this.policyNo = policyNo;
}
public ADate getADate() {
return aDate;
}
public void setADate(ADate aDate) {
this.aDate = aDate;
}
public String getADATE() {
return aDATE;
}
public void setADATE(String aDATE) {
this.aDATE = aDATE;
}
public PolicyNo (String policyNo){
this.policyNo = policyNo;
}
}
api endpoint :
#GET ("policy.php")
Call<PolicyStatus> getPolicyNo (#Query("PolicyNo") String policyNo);

I think you have given list_item_policy to match_parent. as you are saying you are getting 10 size in log. then this can be only reason. may be you will find items on scroll. So just change this to wrap_content.
Also check your recyclerView getting full height check in the preview.

Code looks fine except one thing which I noticed :-
Do this :-
LinearLayoutManager layoutManager
= new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false);
myList.setLayoutManager(layoutManager);
instead of :-
recyclerView.setLayoutManager(new LinearLayoutManager(this));

How to populate recyclerview with compex json data using retrofit?

please advise. I have a complex json object which I get requesting to openweathermap API using Retrofit and GSONConverterFactory. I have a trouble requesting forecast for 5 days, I can't populate my Recyclerview with the data, something goes wrong. I can't get what should I write in the onResponse method of Retrofit callback.
Retrofit requests are all with code 200 and message OK. So trouble is not in this area.
Thank you in advance!
Here is structure of Json object
WeatherData is a root Object which I get parsing my Json, please find the code below. All the code for it (as well as for other POJO's is imported from jsonschema2pojo:
public class WeatherData {
#SerializedName("coord")
#Expose
private Coord coord;
#SerializedName("weather")
#Expose
private List<Weather> weather = null;
#SerializedName("base")
#Expose
private String base;
#SerializedName("main")
#Expose
private Main main;
#SerializedName("visibility")
#Expose
private Integer visibility;
#SerializedName("wind")
#Expose
private Wind wind;
#SerializedName("clouds")
#Expose
private Clouds clouds;
#SerializedName("dt")
#Expose
private Long dt;
#SerializedName("sys")
#Expose
private Sys sys;
#SerializedName("id")
#Expose
private Integer id;
#SerializedName("name")
#Expose
private String name;
#SerializedName("cod")
#Expose
private Integer cod;
public Coord getCoord() {
return coord;
}
public void setCoord(Coord coord) {
this.coord = coord;
}
public List<Weather> getWeather() {
return weather;
}
public void setWeather(List<Weather> weather) {
this.weather = weather;
}
public String getBase() {
return base;
}
public void setBase(String base) {
this.base = base;
}
public Main getMain() {
return main;
}
public void setMain(Main main) {
this.main = main;
}
public Integer getVisibility() {
return visibility;
}
public void setVisibility(Integer visibility) {
this.visibility = visibility;
}
public Wind getWind() {
return wind;
}
public void setWind(Wind wind) {
this.wind = wind;
}
public Clouds getClouds() {
return clouds;
}
public void setClouds(Clouds clouds) {
this.clouds = clouds;
}
public Long getDt() {
return dt;
}
public void setDt(Long dt) {
this.dt = dt;
}
public Sys getSys() {
return sys;
}
public void setSys(Sys sys) {
this.sys = sys;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getCod() {
return cod;
}
public void setCod(Integer cod) {
this.cod = cod;
}
Here is my RecyclerView.Adapter
public class Forecast5DaysAdapter extends RecyclerView.Adapter<Forecast5DaysAdapter.ForecastHolder> {
List<WeatherData> mWeatherDataList;
public static class ForecastHolder extends RecyclerView.ViewHolder {
public TextView dateOnDate;
public ImageView weatherOnDate;
public TextView tempOnDate;
public TextView windSpeedOnDate;
public ForecastHolder(View view) {
super(view);
dateOnDate = (TextView) view.findViewById(R.id.dateOnDate);
windSpeedOnDate = (TextView) view.findViewById(R.id.windSpeedOnDate);
tempOnDate = (TextView) view.findViewById(R.id.tempOnDate);
weatherOnDate = (ImageView) view.findViewById(R.id.imageOnDate);
}
}
public Forecast5DaysAdapter(List<WeatherData> mWeatherDataList) {
this.mWeatherDataList = mWeatherDataList;
}
#Override
public ForecastHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.forecast_card, parent, false);
final ForecastHolder forecastHolder = new ForecastHolder(view);
return forecastHolder;
}
#Override
public void onBindViewHolder(ForecastHolder holder, int position) {
//FILLING THE CARDS IN RECYCLERVIEW WITH INFORMATION
holder.dateOnDate.setText(mWeatherDataList.get(position).getDt().toString());
holder.tempOnDate.setText(mWeatherDataList.get(position).getMain().getTemp().toString());
holder.windSpeedOnDate.setText(mWeatherDataList.get(position).getWind().getSpeed().toString());
Picasso.with(holder.weatherOnDate.getContext()).load("http://openweathermap.org/img/w/" + mWeatherDataList.get(position).getWeather().get(position).getIcon() + ".png").into(holder.weatherOnDate);
}
#Override
public int getItemCount() {
return 0;
}
Here is the class I want to display the Recyclerview
public class Forecast5Days extends AppCompatActivity {
private static final String API_KEY = "HERE IS THE KEY";
private RecyclerView forecastRecycler;
private ArrayList<WeatherData> mWeatherData;
private Forecast5DaysAdapter forecast5DaysAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_forecast_5_days);
forecastRecycler = (RecyclerView) findViewById(R.id.forecast_5_daysRecycler);
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getApplicationContext());
forecastRecycler.setLayoutManager(layoutManager);
final Forecast5DaysAdapter forecast5DaysAdapter = new Forecast5DaysAdapter(mWeatherData);
forecastRecycler.setAdapter(forecast5DaysAdapter);
Intent intent = getIntent();
final String cityName = intent.getStringExtra("cityName");
if (!cityName.isEmpty()) {
Call<WeatherData> call = RetrofitBuilderHelper.weatherAPI.getForecast5Days(cityName, "ru", "metric", API_KEY);
call.enqueue(new Callback<WeatherData>() {
#Override
public void onResponse(Call<WeatherData> call, Response<WeatherData> response) {
//????????????????
}
#Override
public void onFailure(Call<WeatherData> call, Throwable t) {
Toast toast = Toast.makeText(Forecast5Days.this, "Something went wrong with request", Toast.LENGTH_LONG);
toast.show();
}
});
} else {
Toast toast = Toast.makeText(Forecast5Days.this, "Something went wrong with intent", Toast.LENGTH_LONG);
toast.show();
}
}

Your onResponse should be like this
call.enqueue(new Callback<WeatherData>() {
#Override
public void onResponse(Call<WeatherData> call, Response<WeatherData> response) {
if(response.isSuccessful() && response.body != null) {
WeatherData data = response.body();
}
}
#Override
public void onFailure(Call<WeatherData> call, Throwable t) {
Toast toast = Toast.makeText(Forecast5Days.this, "Something went wrong with request", Toast.LENGTH_LONG);
toast.show();
}
});
Also your Call is Call<WeatherData> which will give you a single object. If you want a list of objects your call should be Call<List<WeatherData>>
I think you are looking to pass Weatherinstead of WeatherData so your onResponse should look like
call.enqueue(new Callback<WeatherData>() {
#Override
public void onResponse(Call<WeatherData> call, Response<WeatherData> response) {
if(response.isSuccessful() && response.body != null) {
WeatherData data = response.body();
List<Weather> weatherList = data.getWeatherList();
//Pass this list to your adapter
}
}
#Override
public void onFailure(Call<WeatherData> call, Throwable t) {
Toast toast = Toast.makeText(Forecast5Days.this, "Something went wrong with request", Toast.LENGTH_LONG);
toast.show();
}
});

Your JSON return is a List not only a Single WeatherData Object.
So all you should have to do is a cange of the Expected return value.
Try this:
Call<List<WeatherData>> call = RetrofitBuilderHelper.weatherAPI.getForecast5Days(cityName, "ru", "metric", API_KEY);
call.enqueue(new Callback<List<WeatherData>>() {
#Override
public void onResponse(Call<List<WeatherData>> call, Response<List<WeatherData>> response) {
forecastRecycler.weatherList = response.body();
forecastRecycler.notifyDatasetChanged();
}

RecyclerView (No adapter attached;skipping layout) using retrofit and fragment

Hi Im trying to show a list from retrofit onResponse and I am using recyclerview inside a fragment. The list shoud show chefs but I got an error from RecyclerView
Conexion Class
public class Conexion {
public static String BASE_URL = "http://10.30.0.133:8091/Service1.asmx/";
private static Retrofit retrofit = null;
public static Retrofit getClient() {
if (retrofit==null) {
retrofit = new Retrofit.Builder()
.baseUrl(BASE_URL)
.addConverterFactory(GsonConverterFactory.create())
.build();
}
return retrofit;
}
}
EndPoint Interface
public interface EndPointsInterface {
#GET("chef/{idUser}")
Call<ChefResponse> GetChefsCercanos(#Path("idUser") Integer id_usuario);
}
Entity Usuario
public class Usuario {
#SerializedName("id_usuario")
private Integer id_usuario;
#SerializedName("NombreUsuario")
private String NombreUsuario;
#SerializedName("ApellidoUsuario")
private String ApellidoUsuario;
#SerializedName("TelefonoUsuario")
private String TelefonoUsuario;
#SerializedName("Email")
private String Email;
#SerializedName("Contraseña")
private String Contraseña;
#SerializedName("pos_x")
private Double pos_x;
#SerializedName("pos_y")
private Double pos_y;
public Usuario(){}
public Usuario(Integer id_usuario,String NombreUsuario,String ApellidoUsuario,String TelefonoUsuario,String Email,String Contraseña,Double pos_x,Double pos_y){
this.id_usuario=id_usuario;
this.NombreUsuario=NombreUsuario;
this.ApellidoUsuario=ApellidoUsuario;
this.TelefonoUsuario=TelefonoUsuario;
this.Contraseña=Contraseña;
this.pos_x=pos_x;
this.pos_y=pos_y;
}
public Integer getId_usuario() {
return id_usuario;
}
public void setId_usuario(Integer id_usuario) {
this.id_usuario = id_usuario;
}
public String getNombreUsuario() {
return NombreUsuario;
}
public void setNombreUsuario(String nombreUsuario) {
NombreUsuario = nombreUsuario;
}
public String getApellidoUsuario() {
return ApellidoUsuario;
}
public void setApellidoUsuario(String apellidoUsuario) {
ApellidoUsuario = apellidoUsuario;
}
public String getTelefonoUsuario() {
return TelefonoUsuario;
}
public void setTelefonoUsuario(String telefonoUsuario) {
TelefonoUsuario = telefonoUsuario;
}
public String getEmail() {
return Email;
}
public void setEmail(String email) {
Email = email;
}
public String getContraseña() {
return Contraseña;
}
public void setContraseña(String contraseña) {
Contraseña = contraseña;
}
public Double getPos_x() {
return pos_x;
}
public void setPos_x(Double pos_x) {
this.pos_x = pos_x;
}
public Double getPos_y() {
return pos_y;
}
public void setPos_y(Double pos_y) {
this.pos_y = pos_y;
}
}
Entity Chef
public class Chef extends Usuario{
#SerializedName("id_chef")
private Integer id_chef;
#SerializedName("TipoServicio")
private String TipoServicio;
#SerializedName("Rating")
private Double Rating;
#SerializedName("EstadoChef")
private Boolean EstadoChef;
public Chef(){}
public Chef(Integer id_usuario,String NombreUsuario,String ApellidoUsuario,String TelefonoUsuario,String Email,String Contraseña,Double pos_x,Double pos_y,Integer id_chef,String TipoServicio,Double Rating,Boolean EstadoChef){
super(id_usuario,NombreUsuario,ApellidoUsuario,TelefonoUsuario,Email,Contraseña,pos_x,pos_y);
this.id_chef=id_chef;
this.TipoServicio=TipoServicio;
this.Rating=Rating;
this.EstadoChef=EstadoChef;
}
public Integer getId_chef() {
return id_chef;
}
public void setId_chef(Integer id_chef) {
this.id_chef = id_chef;
}
public String getTipoServicio() {
return TipoServicio;
}
public void setTipoServicio(String tipoServicio) {
TipoServicio = tipoServicio;
}
public Double getRating() {
return Rating;
}
public void setRating(Double rating) {
Rating = rating;
}
public Boolean getEstadoChef() {
return EstadoChef;
}
public void setEstadoChef(Boolean estadoChef) {
EstadoChef = estadoChef;
}
}
Chef Response
public class ChefResponse {
#SerializedName("results")
private Chef[] results;
public Chef[] getresults(){
return results;
}
}
RecyclerView Adapter
public class ListaChefsCercanos extends RecyclerView.Adapter<ListaChefsCercanos.ListaChefsCercanosViewHolder> {
private List<Chef> chefs;
private List<Usuario> usuarios;
private int rowLayout;
private Context context;
#Override
public ListaChefsCercanosViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(rowLayout, parent, false);
return new ListaChefsCercanosViewHolder(view);
}
#Override
public void onBindViewHolder(ListaChefsCercanosViewHolder holder, int position) {
holder.nombreschefscerca.setText(chefs.get(position).getNombreUsuario());
holder.ratingchef.setText(chefs.get(position).getRating().toString());
}
#Override
public int getItemCount() {
return chefs.size();
}
public static class ListaChefsCercanosViewHolder extends RecyclerView.ViewHolder{
LinearLayout chefslayout;
TextView nombreschefscerca;
TextView ratingchef;
public ListaChefsCercanosViewHolder(View v){
super(v);
chefslayout=(LinearLayout) v.findViewById(R.id.cheflayoutcerca);
nombreschefscerca=(TextView) v.findViewById(R.id.tv_NombreChefCercano);
ratingchef=(TextView) v.findViewById(R.id.tv_RatingChefCercano);
}
}
public ListaChefsCercanos(ArrayList <Chef> chefs){
this.chefs=chefs;
//this.rowLayout = rowLayout;
//this.context = context;
}
}
and the fragment
public class RecomendadosFragment extends Fragment {
private RatingBar ratingBar;
//ListAdapter adapter;
ArrayList<Chef> listachef;
ListView lvLista;
String tag_json_array="jarray req";
RecyclerView recyclerviewChefsCarnos;
ListaChefsCercanos mListaChefsCercanos;
private ArrayList<Chef> data;
private ListaChefsCercanos adapter;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View x = inflater.inflate(R.layout.recomendados,null);
//ratingBar = (RatingBar) x.findViewById(R.id.rb_RatingChefCercano);
recyclerviewChefsCarnos=(RecyclerView) x.findViewById(R.id.rv_chefsCernaos);
recyclerviewChefsCarnos.setLayoutManager(new LinearLayoutManager(getActivity().getApplicationContext()));
EndPointsInterface apiService = Conexion.getClient().create(EndPointsInterface.class);
Call<ChefResponse> call = apiService.GetChefsCercanos(5);
call.enqueue(new Callback<ChefResponse>() {
#Override
public void onResponse(Call<ChefResponse> call, Response<ChefResponse> response) {
int statusCode = response.code();
if (response.isSuccessful()) {
ChefResponse jsonResponse = response.body();
if(jsonResponse != null) {
data = new ArrayList<>(Arrays.asList(jsonResponse.getresults()));
adapter= new ListaChefsCercanos(data);
recyclerviewChefsCarnos.setAdapter(adapter);
}
} else {
// Do whatever you want if API is unsuccessful.
}
// List<Chef> chefs= response.body().getResults();
// recyclerviewChefsCarnos.setAdapter(new ListaChefsCercanos( chefs,R.layout.itemchefscercanos,getActivity().getApplicationContext()));
}
#Override
public void onFailure(Call<ChefResponse> call, Throwable t) {
Log.d("Error",t.getMessage());
}
});
return x;
}
this is the error I found while Im debuging
E/RecyclerView: No adapter attached; skipping layout

Update: Use a empty adapter for the RecyclerView in the OncreateView()
recyclerView.setAdapter(new YourAdapter(getCurrentActivity()));

Develop Reference

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