Я учусь создавать приложение android с MVVM, я обнаружил проблему, заключающуюся в том, что данные из API генерируют нулевые значения. Я следовал учебному пособию по этой ссылке , но образцы данных, которые я беру, отличаются. данные, которые я получаю, являются объектом, а не массивом. Я взял данные из ссылка
Модель
public class Corona {
@SerializedName("Provinsi")
private String provinsi;
@SerializedName("Kasus_Posi")
private String positif;
@SerializedName("Kasus_Semb")
private String sembuh;
@SerializedName("Kasus_Meni")
private String meninggal;
public String getProvinsi() {
return provinsi;
}
public void setProvinsi(String provinsi) {
this.provinsi = provinsi;
}
public String getPositif() {
return positif;
}
public void setPositif(String positif) {
this.positif = positif;
}
public String getSembuh() {
return sembuh;
}
public void setSembuh(String sembuh) {
this.sembuh = sembuh;
}
public String getMeninggal() {
return meninggal;
}
public void setMeninggal(String meninggal) {
this.meninggal = meninggal;
}
CoronaDataService
public interface CoronaDataService {
@GET("indonesia/provinsi")
Call<List<Corona>> getCorona();
}
**RetrofitClient**
public class RetrofitClient {
private static Retrofit retrofit;
private static final String BASE_URL = "https://api.kawalcorona.com/";
public static CoronaDataService getService() {
if (retrofit == null) {
retrofit = new Retrofit
.Builder()
.baseUrl(BASE_URL)
.addConverterFactory(GsonConverterFactory.create())
.build();
}
return retrofit.create(CoronaDataService.class);
}
}
Репозиторий
public class CoronaRepository {
private String TAG = "CoronaRepository";
private MutableLiveData mutableLiveData = new MutableLiveData<>();
public CoronaRepository() {
}
public MutableLiveData<List<Corona>> getMutableLiveData() {
final CoronaDataService coronaDataService = RetrofitClient.getService();
Call<List<Corona>> call = coronaDataService.getCorona();
call.enqueue(new Callback<List<Corona>>() {
@Override
public void onResponse(Call<List<Corona>> call, Response<List<Corona>> response) {
Log.e(TAG, "onResponse: " + call.request().url());
Log.e(TAG, "onResponse: " + response.toString());
mutableLiveData.setValue(response.body());;
}
@Override
public void onFailure(Call<List<Corona>> call, Throwable t) {
Log.e(TAG, "onResponse: " + call.request().url());
Log.e(TAG, "onFailure: " + t.getCause());
Log.e(TAG, "onFailure: " + t.getLocalizedMessage());
Log.e(TAG, "onFailure: " + t.getMessage());
Log.e(TAG, "onFailure: " + t.toString());
}
});
return mutableLiveData;
}
}
Адаптер
public class CoronaDataAdapter extends RecyclerView.Adapter<CoronaDataAdapter.CoronaViewHolder> {
private ArrayList<Corona> corona;
@NonNull
@Override
public CoronaViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
CoronaListItemBinding coronaListItemBinding =
DataBindingUtil.inflate(LayoutInflater.from(viewGroup.getContext()),
R.layout.corona_list_item, viewGroup, false);
return new CoronaViewHolder(coronaListItemBinding);
}
@Override
public void onBindViewHolder(@NonNull CoronaViewHolder coronaViewHolder, int i) {
Corona c = corona.get(i);
coronaViewHolder.coronaListItemBinding.setCorona(c);
}
@Override
public int getItemCount() {
if (corona != null) {
return corona.size();
} else {
return 0;
}
}
public void setCoronaList(ArrayList<Corona> corona) {
this.corona = corona;
notifyDataSetChanged();
}
static class CoronaViewHolder extends RecyclerView.ViewHolder {
private CoronaListItemBinding coronaListItemBinding;
CoronaViewHolder(@NonNull CoronaListItemBinding coronaListItemBinding) {
super(coronaListItemBinding.getRoot());
this.coronaListItemBinding = coronaListItemBinding;
}
}
}
MainViewModel
public class MainViewModel extends AndroidViewModel {
private CoronaRepository coronaRepository;
public MainViewModel(@NonNull Application application) {
super(application);
coronaRepository = new CoronaRepository();
}
public LiveData<List<Corona>> getAllCorona() {
return coronaRepository.getMutableLiveData();
}
}
MainActivity
public class MainActivity extends AppCompatActivity {
private MainViewModel mainViewModel;
private CoronaDataAdapter coronaDataAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ActivityMainBinding activityMainBinding =
DataBindingUtil.setContentView(this, R.layout.activity_main);
// bind RecyclerView
RecyclerView recyclerView = activityMainBinding.viewCorona;
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.setHasFixedSize(true);
mainViewModel = ViewModelProviders.of(this).get(MainViewModel.class);
coronaDataAdapter = new CoronaDataAdapter();
recyclerView.setAdapter(coronaDataAdapter);
getAllCorona();
}
private void getAllCorona() {
mainViewModel.getAllCorona().observe(this, new Observer<List<Corona>>() {
@Override
public void onChanged(@Nullable List<Corona> corona) {
coronaDataAdapter.setCoronaList((ArrayList<Corona>) corona);
}
});
}
}
Макет
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:bind="http://schemas.android.com/apk/res-auto"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools">
<data>
<variable
name="corona"
type="com.dekikurnia.belajarmvvm.model.Corona"/>
</data>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:adjustViewBounds="true">
<androidx.cardview.widget.CardView
android:id="@+id/cvCorona"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:layout_margin="8dp"
android:elevation="3dp"
card_view:cardCornerRadius="1dp">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/tvProvinsi"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="4dp"
android:layout_marginEnd="8dp"
android:padding="4dp"
android:text="@{`Provinsi : ` + corona.provinsi}"
android:textColor="@color/colorProvinsi"
android:textSize="20sp"
bind:layout_constraintEnd_toEndOf="parent"
bind:layout_constraintStart_toStartOf="parent"
bind:layout_constraintTop_toTopOf="parent"
tools:text="DKI. Jakarta" />
<TextView
android:id="@+id/tvPositif"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="4dp"
android:layout_marginEnd="8dp"
android:padding="4dp"
android:text="@{`Positif : ` + corona.positif}"
android:textColor="@color/colorPositif"
android:textSize="14sp"
bind:layout_constraintEnd_toEndOf="parent"
bind:layout_constraintStart_toStartOf="parent"
bind:layout_constraintTop_toBottomOf="@+id/tvProvinsi"
tools:text="Positif" />
<TextView
android:id="@+id/tvSembuh"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="4dp"
android:layout_marginEnd="8dp"
android:padding="4dp"
android:text="@{`Sembuh : ` + corona.sembuh}"
android:textColor="@color/colorSembuh"
android:textSize="14sp"
bind:layout_constraintEnd_toEndOf="parent"
bind:layout_constraintStart_toStartOf="parent"
bind:layout_constraintTop_toBottomOf="@+id/tvPositif"
tools:text="Sembuh" />
<TextView
android:id="@+id/tvMeninggal"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="4dp"
android:layout_marginEnd="8dp"
android:padding="4dp"
android:text="@{`Meninggal : ` + corona.meninggal}"
android:textColor="@color/colorMeninggal"
android:textSize="14sp"
bind:layout_constraintEnd_toEndOf="parent"
bind:layout_constraintStart_toStartOf="parent"
bind:layout_constraintTop_toBottomOf="@+id/tvSembuh"
tools:text="Meninggal" />
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.cardview.widget.CardView>
</LinearLayout>
</layout>