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java.lang.IllegalArgumentException: HTTP method annotation is required (e.g., #GET, #POST, etc.).Error when trying call apiInterface GET request

I get error when trying to call API interface get request. I am trying to pass a value through GET method. But I get this error in logcat Caused by: java.lang.IllegalArgumentException: HTTP method annotation is required (e.g., #GET, #POST, etc.). for method ApiInterface.name
Here is my java code. Here I call the function namely getname()to pass a string value through GET request. Here I also have one more function getdata() which display output in the recyclerview.
public class MainActivity extends AppCompatActivity {
RecyclerView recyclerView;
ListAdapter1 listAdapter;
// List<SupermarketModels> supermarketModelsList = new ArrayList<>();
ApiInterface apiInterface;
String hi;
Button badd;
EmptyAdapterl emptyAdapter = new EmptyAdapterl();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
badd=findViewById(R.id.btadd);
badd.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent= new Intent(MainActivity.this,Insert.class);
startActivity(intent);
}
});
String tablen= getIntent().getStringExtra("name");
// supermarketModelsList.add(new SupermarketModels(1,"sugar cane","20kg",
// "50rs","31/12/2021"));
//
// supermarketModelsList.add(new SupermarketModels(2,"sugar cane","20kg",
// "50rs","31/12/2021"));
// supermarketModelsList.add(new SupermarketModels(3 ,"sugar cane","20kg",
// "50rs","31/12/2021"));
initialization();
hi=tablen;
Toast.makeText(MainActivity.this,"oo"+hi,Toast.LENGTH_SHORT).show();
getname(hi);
// recyclerView.setAdapter(emptyAdapter);
// getdata();
}
private void initialization(){
recyclerView = findViewById(R.id.recyclerview1);
Retrofit retrofit = APIClient.getclient();
apiInterface = retrofit.create(ApiInterface.class);
// apiInterface = APIClient.getRetrofitInstance().create(ApiInterface.class);
}
private void setadapter(List<SupermarketModels> supermarketModels){
listAdapter = new ListAdapter1(this, supermarketModels,hi);
// LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
#SuppressLint("WrongConstant")
RecyclerView.LayoutManager lm = new LinearLayoutManager(getApplicationContext(), LinearLayout.VERTICAL, false);
recyclerView.setLayoutManager(lm);
// linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(lm);
recyclerView.setAdapter(listAdapter);
}
private void getname(String n) {
apiInterface.name(n).enqueue(new Callback<DeleteResponse>() {
#Override
public void onResponse(Call<DeleteResponse> call, Response<DeleteResponse> response) {
try {
if (response.body().getStatus().equals("1")){
Toast.makeText(MainActivity.this,"Successfully inserted",Toast.LENGTH_SHORT).show();
}
else{
Toast.makeText(MainActivity.this,"Error while inserting",Toast.LENGTH_SHORT).show();
}
} catch (Exception e){
}
}
#Override
public void onFailure(Call<DeleteResponse> call, Throwable t) {
}
});
}
private void getdata(){
apiInterface.getList().enqueue(new Callback<GetListResponse>() {
#Override
public void onResponse(Call<GetListResponse> call, Response<GetListResponse> response) {
try {
if (response!= null){
if (response.body().getStatus().equals("1")){
// category_adapter category_adapter = new category_adapter(getContext(),datalist);
setadapter(response.body().getData());
}
else {
Toast.makeText(MainActivity.this, response.body().getMessage(), Toast.LENGTH_SHORT).show();
}
}
} catch (Exception e){
Log.e("exp", e.getLocalizedMessage());
}
}
#Override
public void onFailure(Call<GetListResponse> call, Throwable t) {
}
});
}
}
This is my apiInterface class
public interface ApiInterface {
#GET("user-controller.php?operation=list")
Call<GetListResponse> getList();
Call<DeleteResponse> name(#Field("name") String name1);
}

make sure you are using Retrofit2 in your #GET Imports (maybe you are using the wrong #Get)

I try to parse my JSON into my Java with Retrofit

I tried someone's tutorial to parse JSON in Java using retrofit.
I change the url in the tutorial with mine http://umkmkabupatenmalang.xyz/api/config/ . But when I try to run it on Android, I get an error like this
this is my MainActivity.java
import ...
public class MainActivity extends AppCompatActivity {
private RecyclerView recyclerView;
private ArrayList<AndroidVersion> data;
private DataAdapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
view();
}
private void view(){
recyclerView = (RecyclerView)findViewById(R.id.card_recycler_view);
recyclerView.setHasFixedSize(true);
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getApplicationContext());
recyclerView.setLayoutManager(layoutManager);
loadJSON();
}
private void loadJSON(){
Retrofit retrofit = new Retrofit.Builder()
.baseUrl("http://umkmkabupatenmalang.xyz/")
.addConverterFactory(GsonConverterFactory.create())
.build();
RequestInterface request = retrofit.create(RequestInterface.class);
Call<JSONResponse> call = request.getJSON();
call.enqueue(new Callback<JSONResponse>() {
#Override
public void onResponse(Call<JSONResponse> call, Response<JSONResponse> response) {
JSONResponse jsonResponse = response.body();
data = new ArrayList<>(Arrays.asList(jsonResponse.getAndroid()));
adapter = new DataAdapter(data);
recyclerView.setAdapter(adapter);
}
#Override
public void onFailure(Call<JSONResponse> call, Throwable t) {
Log.d("Error", t.getMessage());
}
});
}
}
this is my json that i want to parse
can someone explain to me whats the error mean, and give a solution?
this is my JSONResponse
import com.example.skripsi.model.AndroidVersion;
public class JSONResponse {
private AndroidVersion[] android;
public AndroidVersion[] getAndroid() {
return android;
}
}

In your JSONResponse class, you should also provide a setter.
import com.google.gson.annotations.SerializedName;
import com.example.skripsi.model.AndroidVersion;
public class JSONResponse {
#SerializedName("data")
private AndroidVersion[] android;
public AndroidVersion[] getAndroid() {
return android;
}
public setAndroid(AndroidVersion[] androids){
this.android = androids;
}
}
Let me know if this works for you.

You can use this website to convert your JSON to java classes in the future
Convert JSON into java classes

set value of a static field in Intent service

I have a static ArrayList categories in MainActivity. I want to load data to category in a IntentService which is call Retrofit 2 response.
when i debugged. Retrofit response work well it return a arraylist of category and add to categories but when I run the project the categories is null.
I donn't know why i get this error. Is there any way to fix it?
MainActivity.java
public class MainActivity extends AppCompatActivity {
public static final String TAG="MainActivity";
public static User user = new User();
public static ArrayList<Category> categories = new ArrayList<>();
private Context context;
TextView textCartItemCount;
AppInfomation appInfo;
Retrofit retrofit;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
context = this;
appInfo = new AppInfomation(context);
retrofit = ApiClient.getApiClient();
Intent intent = new Intent(this, GetCategoryService.class);
startService(intent);
...
GetCategoryService.java.
public class GetCategoryService extends IntentService {
public GetCategoryService(){
super("GetCategoryService");
}
#Override
protected void onHandleIntent(#Nullable Intent intent) {
Retrofit retrofit = ApiClient.getApiClient();
Api api = retrofit.create(Api.class);
Call<ArrayList<Category>> getCategory = api.getCategories();
try {
Response<ArrayList<Category>> response = getCategory.execute();
for(Category c: response.body()){
MainActivity.categories.add(c);
}
} catch (IOException e) {
Log.d("GetCategoryService", "Cannot call API");
}
}
public void parseCategories(ArrayList<Category> cate){
MainActivity.categories = cate;
}
}

need to wait answer from retrofit request in MainActivity

i have request in retrofit where return List which assign for my dataSet field. i did it in onResponse method. But initializing of recycle view in MainActivity is faster than request and view is showing nothing. What i can to do for waiting onResponse method.
I have this two methods in class NewsRepository.java
private void setNews(){
GetDataService service = RetrofitClientInstance.getRetrofitInstance().create(GetDataService.class);
Call<ItemsAPI> call = service.getAllItems();
call.enqueue(new Callback<ItemsAPI>() {
#Override
public void onResponse(Call<ItemsAPI> call, Response<ItemsAPI> response) {
Log.d(TAG, "onResponse");
items = response.body();
dataSet = items.getItems();
Log.d(TAG, dataSet.get(0).getTitle());
}
#Override
public void onFailure(Call<ItemsAPI> call, Throwable t) {
Log.d(TAG, "onFailure "+ t.getMessage());
}
});
}
public MutableLiveData<List<News>> getNews(){
setNews();
MutableLiveData<List<News>> data = new MutableLiveData<>();
data.setValue(dataSet);
return data;
}
And have this in MainActivityModelView.java
public void init(){
if(mNews != null){
return;
}
mRepo = NewsRepository.getInstance();
mNews = mRepo.getNews();
}
And this is MyActivity.java
public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";
private RecyclerView mRecycleView;
private RecycleViewAdapter mAdapter;
private MainActivityViewModel mMainActivityViewModel;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mRecycleView = findViewById(R.id.recyclev_view);
mMainActivityViewModel = ViewModelProviders.of(this).get(MainActivityViewModel.class);
mMainActivityViewModel.init();
mMainActivityViewModel.getNews().observe((LifecycleOwner) this, new Observer<List<News>>() {
#Override
public void onChanged(#Nullable List<News> news) {
mAdapter.notifyDataSetChanged();
}
});
mMainActivityViewModel.getIsUpdating().observe((LifecycleOwner) this, new Observer<Boolean>() {
#Override
public void onChanged(#Nullable Boolean aBoolean) {
if(aBoolean){
}
else{
mRecycleView.smoothScrollToPosition(mMainActivityViewModel.getNews().getValue().size()-1);
}
}
});
initRecyclerView();
Log.d(TAG, "RecycleView is inited");
}
private void initRecyclerView(){
mAdapter = new RecycleViewAdapter(this, mMainActivityViewModel.getNews().getValue());
RecyclerView.LayoutManager linearLayoutManager = new LinearLayoutManager(this);
mRecycleView.setLayoutManager(linearLayoutManager);
mRecycleView.setAdapter(mAdapter);
}
}
The Activity is init is faster then my request.
2019-05-18 09:32:12.299 13859-13859/com.krasnov.rxjavalearning D/MainActivity: RecycleView is inited
2019-05-18 09:32:13.098 13859-13859/com.krasnov.rxjavalearning D/NewsRepository: onResponse

I think it's better to move this code above othre code below findViewById
initRecyclerView();
Log.d(TAG, "RecycleView is inited");
In this function its better to not use this constractor
mAdapter = new RecycleViewAdapter(this, mMainActivityViewModel.getNews().getValue());
Use this instead (create this constractor)
mAdapter = new RecycleViewAdapter(this);
And when your data arrive fire this function in adapter
public void setData( List<News> list) {
this.list= list
notifyDataSetChanged()
}
So your code is like
mMainActivityViewModel.getNews().observe((LifecycleOwner) this, new Observer<List<News>>() {
#Override
public void onChanged(#Nullable List<News> news) {
mAdapter.setData(news)
}
});

in your onResponse you should notify adapter add this:
yourAdapter.notifyDataSetChanged();

On resume call the retrofit service,
after response create a callback
method in ViewModel to notify in Activty class, after notified then
initialise recyclerview.
.

Arraylist get not filled

I don't understand why the size is null. So the data is not loaded in the recyclerview.
I load the URLS from the Images from the my database and it should be shown into the recyclerview. I tested and I get the URL's but they are not added to the list.
SharedPreferences USERNAMEsp;
String USERNAME;
RecyclerView recyclerViewImageSlider;
List<ImageGetter> imageList = new ArrayList<>();
ImageAdapter imageAdapter;
ImageGetter imageGetter;
PullData pullData = new PullData(Profil.this);
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_profil);
USERNAMEsp = getSharedPreferences("DATAUSERNAME",MODE_PRIVATE);
USERNAME = USERNAMEsp.getString("DATAUSERNAME","");
pullData.getData(USERNAME, "3", new Pullcallback() {
#Override
public void getSingleData(String data) {
imageGetter = new ImageGetter(data);
imageList.add(imageGetter);
}
#Override
public void getMultipleData(String[] multipledatas) {
}
#Override
public void onError(String errormessage) {
}
});
recyclerViewImageSlider = findViewById(R.id.recyclerViewImages);
imageAdapter = new ImageAdapter(Profil.this, imageList, new AdapterCallback() {
#Override
public void onLoaded() {
}
});
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(Profil.this,LinearLayoutManager.HORIZONTAL,false);
recyclerViewImageSlider.setLayoutManager(layoutManager);
recyclerViewImageSlider.setHasFixedSize(true);
recyclerViewImageSlider.setAdapter(imageAdapter);
recyclerViewImageSlider.setOnFlingListener(new PagerSnapHelper());
SnapHelper snapHelper = new PagerSnapHelper();
snapHelper.attachToRecyclerView(recyclerViewImageSlider);
imageAdapter.notifyDataSetChanged();
}

Call imageAdapter.notifyDataSetChanged(); after imageList.add(imageGetter); because you are modifying arraylist and you have to let the adapter know to reload data set
pullData.getData(USERNAME, "3", new Pullcallback() {
#Override
public void getSingleData(String data) {
imageGetter = new ImageGetter(data);
imageList.add(imageGetter);
imageAdapter.notifyDataSetChanged();
}
#Override
public void getMultipleData(String[] multipledatas) {
}
#Override
public void onError(String errormessage) {
}
});