Develop Reference

How to call tokenURI() function in ERC721 using Web3j library?

I need to view NFT-image with all metadata. I decide to call tokenURI() function like it, but it's ain't working
private fun getNFTMetadata() = viewModelScope.launch(Dispatchers.IO){
//tokenURI -- by token ID
val web3j: Web3j = createWeb3j() ?: return#launch
var ids = listOf<Uint256>(Uint256.DEFAULT)
val function: org.web3j.abi.datatypes.Function = org.web3j.abi.datatypes.Function(
"tokenURI",
ids,
listOf()
)
val encodedFunction = FunctionEncoder.encode(function)
val response: EthCall = web3j.ethCall(
Transaction.createEthCallTransaction(WALLET_ADDRESS, CONTRACT_ADDRESS, encodedFunction),
LATEST
).sendAsync().get()
if (response.value != null){
state.value = response.value
} else {
state.value = "NAN"
}
}
private fun createWeb3j(): Web3j? {
val webSocketService = WebSocketService(WEB_SOCKET_URL, true)
try {
webSocketService.connect()
} catch (e: ConnectException) {
e.printStackTrace()
}
return Web3j.build(webSocketService)
}
I really don't know how to call that function rightly. Help me please!)

I found my mistake. I had change received parameters.
private fun getNFTMetadata() = viewModelScope.launch(Dispatchers.IO){
//tokenURI -- by token ID
val web3j: Web3j = createWeb3j() ?: return#launch
val big: Uint256 = Uint256(1)
val function: org.web3j.abi.datatypes.Function = org.web3j.abi.datatypes.Function(
"tokenURI",
listOf(big),
listOf(object : TypeReference<Utf8String>() {})
)
val encodedFunction = FunctionEncoder.encode(function)
val response: EthCall = web3j.ethCall(
Transaction.createEthCallTransaction(WALLET_ADDRESS, CONTRACT_ADDRESS, encodedFunction),
LATEST
).sendAsync().get()
if (response.value != null){
state.value = response.value
} else {
state.value = "NAN"
}
}

#Get annotation does not accept any other arguments other than top-headlines (Kotlin)(NewsAPI)(Android Studio)

I am currently facing a problem with the endpoint argument in the #GET Annotation in Android Studio.
Here are the list of endpoints
NewsApi Endpoints
Defining the get function with the following endpoint v2/top-headlines works completely fine
interface APIDirectory{
#GET("v2/top-headlines")
suspend fun getArticles(
#Query("country")
countryCode: String = "Singapore",
#Query("page")
pageNumber: Int = 1,
#Query("sortBy")
sortBy:String = "publishedAt",
#Query("apiKey")
apiKey: String = API_KEY
):Response<ArticleList>
However, changing the endpoint to /v2/everything will result in an error
2022-12-03 02:47:11.887 10220-10220/com.example.thenewsapplication E/Tech: An error occured
This error is located in the Tech Fragment, the error occurs in the is Resource.Error portion of the code.
viewModel.searchNews.observe(viewLifecycleOwner, Observer{ response ->
Log.e("Tech", "in the technology fragment")
when (response){
is Resource.Success -> {
response.data?.let {newsResponse ->
//Submits the data to the recyclerview
newsAdapter.differ.submitList(newsResponse.articles.toList())
val totalPages = newsResponse.totalResults / Constants.QUERY_PAGE_SIZE + 2
isLastPage = viewModel.searchNewsPage == totalPages
}
}
is Resource.Error -> {
response.message?.let {
Log.e("Tech","An error occured $it")
}
}
is Resource.Loading -> {
...}
I concluded that the error must be due to the response argument in the when statement, which refers to the searchNews variable in the viewmodel
val searchNews: MutableLiveData<Resource<ArticleList>> = MutableLiveData()
fun getsearchNews(countryCode: String) = viewModelScope.launch {
Log.e("viewmodel", "in the viewmodel getsearchNews")
searchNews.postValue(Resource.Loading())
Log.e("viewmodel", "getting data")
val response = newsRepository.getSearchNews(countryCode, breakingNewsPage)
searchNews.postValue(handleSearchNewsResponse(response))
}
private fun handleSearchNewsResponse(response: Response<ArticleList>): Resource<ArticleList> {
if (response.isSuccessful) {
response.body()?.let { resultResponse ->
searchNewsPage++
if (searchNewsResponse == null) {
searchNewsResponse = resultResponse
} else {
val olArticles = searchNewsResponse?.articles
val newArticles = resultResponse.articles
olArticles?.addAll(newArticles)
}
return Resource.Success(searchNewsResponse ?: resultResponse)
}
}
return Resource.Error(response.message())
}
From the handleSearchNewsResponse above, the Response from the ArticleList is a failure, the ArticleList class is just a kotlin class that represents the Response from the WebService
data class ArticleList(
val articles: MutableList<Article>,
val status: String,
val totalResults: Int
)

map an object return unresolved reference

I'm trying to map a network object to a domain object with a .map in the response, but compiler says me that .map is an unresolved reference. What is wrong?
suspend fun getAllPlayersFromNetwork(): PlayersDomainModel {
val response: PlayersNetworkModel = api.getAllPlayers()
**return response.**map** { it.toDomain() }**
}
This is the data class of the network part
data class PlayersNetworkModel(
#SerializedName("data") var data: MutableList<DataNetworkModel> = mutableListOf(),
#SerializedName("meta") var meta: MetaNetworkModel? = MetaNetworkModel()
){
constructor() : this(mutableListOf(), MetaNetworkModel())
}
This is the object of the domain
data class PlayersDomainModel(
var data: MutableList<DataDomainModel> = mutableListOf(),
var meta: MetaDomainModel? = MetaDomainModel()
)
and this is the transform method to map
fun PlayersNetworkModel.toDomain(): PlayersDomainModel {
val mapMeta : MetaDomainModel
meta.let {
mapMeta = MetaDomainModel(meta?.totalPages, meta?.currentPage, meta?.nextPage, meta?.perPage, meta?.totalCount)
}
val mapData : MutableList<DataDomainModel> = mutableListOf()
data.let {
for(item in data){
val mapTeam : TeamDomainModel = TeamDomainModel(item.team?.id, item.team?.abbreviation, item.team?.city, item.team?.conference, item.team?.division, item.team?.fullName, item.team?.name)
mapData.add(DataDomainModel(item.id, item.firstName, item.heightFeet, item.heightInches, item.lastName, item.position, mapTeam, item.weightPounds))
}
}
return PlayersDomainModel(mapData, mapMeta)
}

I'm not sure why simple data class suppose to have a map method.
Instead of mapping:
return response.map { it.toDomain() }
just use toDomain() on the response:
return response.toDomain()

Android Mockito test cases with Retrofit

I am new to test cases and I am trying to write test cases for the below code but I did not get success after trying several method. My main target is to cover code coverage of MaintenanceStatusResponseHandler.kt class. I am using mockito to write the test cases. I am already implemented jococo for code coverage but I am facing some issue to write a test cases. Please help me to write test cases of MaintenanceStatusResponseHandler class
Thanks in advance
internal class MaintenanceStatusResponseHandler {
public fun getMaintenanceResponse(voiceAiConfig : VoiceAiConfig):MaintenanceStatus{
val maintenanceStatus = MaintenanceStatus()
val retrofitRepository = RetrofitRepository()
val maintenanceUrl : String
val jwtToken : String
when (voiceAiConfig.server) {
BuildConfig.ENV_PRODUCTION_SERVER -> {
jwtToken = BuildConfig.JWT_TOKEN_PRODUCTION
maintenanceUrl = BuildConfig.MAINTENANCE_PROD_URL
}
BuildConfig.ENV_STAGING_SERVER -> {
jwtToken = BuildConfig.JWT_TOKEN_STAGING
maintenanceUrl = BuildConfig.MAINTENANCE_SANDBOX_URL
}
else -> {
jwtToken = BuildConfig.JWT_TOKEN_SANDBOX
maintenanceUrl = BuildConfig.MAINTENANCE_SANDBOX_URL
}
}
val header = "${VoiceAISDKConstant.JWT_TOKEN_PREFIX} $jwtToken"
retrofitRepository.getRetrofit(maintenanceUrl)
.getMaintenanceStatus(header)
.subscribe { response: MaintenanceStatus.Content, error: Throwable? ->
error.let {
if (error != null) {
maintenanceStatus.error = error
}
}
response.let {
maintenanceStatus.content = response
}
}
return maintenanceStatus
}
}
repository class
class RetrofitRepository() {
val TAG = RetrofitRepository::class.java.canonicalName
fun getRetrofit(baseUrl: String?): VoiceAiServices {
val voiceAiServices: VoiceAiServices = Retrofit.Builder()
.baseUrl(baseUrl!!)
.addConverterFactory(GsonConverterFactory.create())
.addCallAdapterFactory(RxJava2CallAdapterFactory.create())
.build().create(VoiceAiServices::class.java)
return voiceAiServices
}
}
interface
interface VoiceAiServices {
#GET("/v1/api/status")
fun getMaintenanceStatus(#Header("Authorization")header: String): Single<MaintenanceStatus.Content>
}
Pojo class
data class MaintenanceStatus(
var error: Throwable? = null,
var content: Content? = null
) {
data class Content(
val enabled: Boolean,
val maintenanceMsg: String
)
}

Successful API call returning null value when using Single.zip()

I am using Single.zip() and Function 5 to consolidate 5 API calls into one Single:
private fun loadProfileAndBalances() {
registerSubscription(
Single.zip<AvailableFundsResult, IncomingFundsResult, TotalEarnedResult, TotalDonatedResult, ProfileResult, Unit>(
Interactors.api.paymentsApiClient.getAvailableFunds()
.map<AvailableFundsResult> {
Timber.d("Available Result [${it.amount}]") <------ DollarAmount object with null amount
AvailableFundsResult.Amount(it) }
.onErrorReturn { AvailableFundsResult.Error(it) }
.scheduleIOUI(),
Interactors.api.paymentsApiClient.getIncomingFunds()
.map<IncomingFundsResult> { IncomingFundsResult.Amount(it) }
.onErrorReturn { IncomingFundsResult.Error(it) }
.scheduleIOUI(),
Interactors.api.paymentsApiClient.getTotalEarned()
.map<TotalEarnedResult> { TotalEarnedResult.Amount(it) }
.onErrorReturn { TotalEarnedResult.Error(it) }
.scheduleIOUI(),
Interactors.api.paymentsApiClient.getTotalDonated()
.map<TotalDonatedResult> { TotalDonatedResult.Amount(it) }
.onErrorReturn { TotalDonatedResult.Error(it) }
.scheduleIOUI(),
Interactors.profileManager.getNotCachedProfile()
.map<ProfileResult> { ProfileResult.Profile(it) }
.onErrorReturn { ProfileResult.Error(it) }
.scheduleIOUI(),
Function5 { availableFunds: AvailableFundsResult, incomingFunds: IncomingFundsResult, totalEarned: TotalEarnedResult, totalDonated: TotalDonatedResult, profileResult: ProfileResult ->
availableTotal = when (availableFunds) {
is AvailableFundsResult.Amount ->
availableFunds.result.amount
is AvailableFundsResult.Error -> {
Timber.w(availableFunds.throwable, "Error while fetching sponsorships")
"0.00"
}
}
incomingTotal = when (incomingFunds) {
is IncomingFundsResult.Amount -> incomingFunds.result.amount
is IncomingFundsResult.Error -> {
Toast.makeText(activity, getString(R.string.payout_main_error_loading_totals), Toast.LENGTH_SHORT).show()
"0.00"
}
}
earnedTotal = when (totalEarned) {
is TotalEarnedResult.Amount -> totalEarned.result.amount
is TotalEarnedResult.Error -> {
Toast.makeText(activity, getString(R.string.payout_main_error_loading_totals), Toast.LENGTH_SHORT).show()
"0.00"
}
}
donatedTotal = when (totalDonated) {
is TotalDonatedResult.Amount -> totalDonated.result.amount
is TotalDonatedResult.Error -> {
Toast.makeText(activity, getString(R.string.payout_main_error_loading_totals), Toast.LENGTH_SHORT).show()
"0.00"
}
}
onboardingComplete = when (profileResult) {
is ProfileResult.Profile ->
profileResult.result.isOnboardingCompleted
is ProfileResult.Error -> {
Timber.e(profileResult.throwable, "Error fetching profile")
true
}
}
}
).ignoreElement()
.subscribe(::updateViews) {
it.printStackTrace()
availableTotal = ""
incomingTotal = ""
earnedTotal = ""
donatedTotal = ""
onboardingComplete= false
vWalletRefresher.isRefreshing = false
internetConnectionError(it)
})
}
Each of these API calls is succeeding with code 200. The call made with Interactors.api.paymentsApiClient.getAvailableFunds() is returning {"amount":264.69}, which is parsed into an object of this class:
internal data class DollarAmount(#SerializedName("amount") val amount: String)
The paymentsApiClient repeatedly referenced is built like this:
private fun createNewPaymentsClient(authRefreshClient: AuthRefreshClient,
preferencesInteractor: PreferencesInteractor): PaymentsApiClient {
val loggingInterceptor = run {
val httpLoggingInterceptor = HttpLoggingInterceptor()
httpLoggingInterceptor.apply {
httpLoggingInterceptor.level = if (BuildConfig.DEBUG) HttpLoggingInterceptor.Level.BODY else HttpLoggingInterceptor.Level.NONE
}
}
val okHttpClient = createHttpClientBuilder()
.addInterceptor(createSessionRequestInterceptor())
.addInterceptor(createUserAgentInterceptor(context))
.addInterceptor(loggingInterceptor)
.authenticator(RefreshUserAuthenticator(authRefreshClient, preferencesInteractor,
UnauthorizedNavigator(SDKInternal.appContext, Interactors.preferences)))
.build()
val gson = GsonBuilder().excludeFieldsWithoutExposeAnnotation().setLenient().create()
return Retrofit.Builder()
.client(okHttpClient)
.addCallAdapterFactory(RxJava2CallAdapterFactory.create())
.addConverterFactory(GsonConverterFactory.create(gson))
.baseUrl(Interactors.apiEndpoint)
.build()
.create(PaymentsApiClient::class.java)
}
Despite the API call being successful, the log statement that is printed in Single.zip for a successful retrieval of a DollarAmount via Interactors.api.paymentsApiClient.getAvailableFunds() the is showing its amount as being null, rather than 264.69. What is wrong with my parsing that is making this null?
Edit: As someone noticed, I am wrapping the results in another set of classes:
private sealed class AvailableFundsResult {
data class Error(val throwable: Throwable) : AvailableFundsResult()
data class Amount(val result: DollarAmount) : AvailableFundsResult()
}
private sealed class IncomingFundsResult {
data class Error(val throwable: Throwable) : IncomingFundsResult()
data class Amount(val result: DollarAmount) : IncomingFundsResult()
}
private sealed class TotalEarnedResult {
data class Error(val throwable: Throwable) : TotalEarnedResult()
data class Amount(val result: DollarAmount) : TotalEarnedResult()
}
private sealed class TotalDonatedResult {
data class Error(val throwable: Throwable) : TotalDonatedResult()
data class Amount(val result: DollarAmount) : TotalDonatedResult()
}
private sealed class ProfileResult {
data class Error(val throwable: Throwable) : ProfileResult()
data class Profile(val result: InfluencerProfileDto) : ProfileResult()
}
I don't think this is relevant though because it the amount is coming back null before I even spit out an instance of these wrapper classes.
Edit 2: Class that gets returned from 5th API call:
#JsonClass(generateAdapter = true)
internal data class InfluencerProfileDto(
#Json(name = "id") val id: String,
#Json(name = "emailAddress") val email: String?,
#Json(name = "phoneNumber") val phoneNumber: PhoneNumberDto?,
#Json(name = "isPhoneNumberVerified") val isPhoneNumberVerified: Boolean,
#Json(name = "isEmailVerified") val isEmailVerified: Boolean,
#Json(name = "notificationTimePreference") val notificationTimePreference: String,
#Json(name = "isInstagramConnected") val isInstagramConnected: Boolean,
#Json(name = "isFacebookConnected") val isFacebookConnected: Boolean,
#Json(name = "isTwitterConnected") val isTwitterConnected: Boolean,
#Json(name = "currencyIsoSymbol") val currencyIsoSymbol: String,
#Json(name = "currencySymbol") val currency: String,
#Json(name = "birthDate") val birthDate: Date?,
#Json(name = "name") val name: String?,
#Json(name = "profilePictureUri") val avatarUrl: String?,
#Json(name = "gender") val gender: Gender?)
{
val isOnboardingCompleted: Boolean
get() = gender!= Gender.UNKNOWN && birthDate!= null && !!notificationTimePreference.isNullOrEmpty() && isPhoneNumberVerified && !email.isNullOrEmpty()
}

my approach is in java
first of all we need two libraries that you might not be using in your project ie.
gson => for pasing objects from string and vice versa
volley => for string http requests
please google their official github pages and install the latest versions
then we ll be creating a common result object to bear results
class Result {
boolean error; // this field can be used by the api to tell if there was some error while processing the request
String message; // here api can give you some extra message if there was some error
String result; // here you get the result. you can make it a map as well if you want to receive an object and later parse to a unique object class
}
this is a function you can use for HTTP requets
public static Single<Result> getHttpResult(String api, Map<Stirng, String> params){
return Single.create(emitter -> {
StringRequest stringRequest = new StringRequest(Request.Method.POST, api, response -> {
Log.i("RESPONSE :", response);
try {
Result result = new Gson().fromJson(response, Result.java);
emitter.onSuccess(result);
} catch (JSONException e) {
emitter.onError(e);
}
}, emitter::onError) {
#Override
protected Map<String, String> getParams() {
return params;
}
};
stringRequest.setRetryPolicy(new DefaultRetryPolicy(0, 0, 0));
RequestQueue requestQueue = Volley.newRequestQueue(context);
requestQueue.add(stringRequest);
});
}
this is how you can get multiple results at once and i recommend you also check the internet connectivity if user has enough internet then only make parallel requests else it wont produce good UX
...
List<Single<Result>> tasks = new ArrayList();
tasks.add(getHttpResult("https://..."), /**here you can add a map with params that your api might require for auth and other purposes**/);
tasks.add(...);
tasks.add(...);
tasks.add(...);
Single.zip(tasks, objects -> {
List<Result> results = new ArrayList();
for(Object object : objects){
results.add((Result)object)
}
return results;
}).subscribe(results -> {
// this result object have all the results of http requests
// for distinguising results from each other you can create a field on the result object
});
...
hope my approach is helpful to you ;)