Develop Reference

baseurl must end in /

I have weather api to parse data for 10 days
All it's good , but I have problem with retrofit now , I have app crashes , my URL(with API) have / in the end.
But still don't working.
Also I have dependency injection for retrofit.
Goal is to get data from api.
Hope , that you will help me to resolve this problem.
package const
const val BASE_URL = "https://api.weatherapi.com/v1/forecast" +
".json?key=a9f9d57b6e064f16b28141346231001&q=London&days=10&aqi=no&alerts=no/" // error here
const val apikey = "a9f9d57b6e064f16b28141346231001"
const val WeatherDays = 10
interface WeatherServiceAPI {
#GET("forecast.json")
suspend fun Weatherday(
#Query("days") days : Int
) : WeatherResponse
#GET("forecast.json")
suspend fun searchcitybycoord(#Query("lat")lat:String) : List<WeatherLocationDTO>
#GET("forecast.json")
suspend fun searchingbyCity(#Query("q") name: String) : List<WeatherLocationDTO>
companion object{
operator fun invoke(
connectivityInterceptor: Interceptor
):WeatherServiceAPI{
val requestInterceptor = Interceptor{
chain -> val url = chain.request()
.url
.newBuilder()
.addQueryParameter("key", apikey)
.build()
val request = chain.request()
.newBuilder()
.url(url)
.build()
return#Interceptor chain.proceed(request)
}
val okHttpClient = OkHttpClient.Builder()
.addInterceptor(requestInterceptor)
.addInterceptor(connectivityInterceptor)
.build()
return Retrofit.Builder()
.client(okHttpClient)
.baseUrl("https://api.weatherapi.com/v1/") // error line
.addCallAdapterFactory(CoroutineCallAdapterFactory())
.addConverterFactory(GsonConverterFactory.create())
.build()
.create(WeatherServiceAPI::class.java)
}
}
}
#Provides
#Singleton
fun providerepository(api:WeatherServiceAPI):ForecastRepository{
return ForecastRepositoryImpl(api)
}
#Provides
#Singleton
fun provideWeatherApiService(retrofit: Retrofit) =
retrofit.create(WeatherServiceAPI::class.java)
#Provides
#Singleton
fun provideRetrofit ( okHttpClient: OkHttpClient) = Retrofit.Builder()
.addConverterFactory(GsonConverterFactory.create())
.baseUrl(BASE_URL)
.client(okHttpClient)
.build()
#Provides
#Singleton
fun provideOkhttpClient(interceptor: Interceptor): OkHttpClient {
val httpBuilder = OkHttpClient.Builder().addInterceptor(interceptor)
return httpBuilder.build()
}
#Provides
#Singleton
fun provideinterceptor():Interceptor{
return Interceptor {
val request =it.request().newBuilder()
val actualRequest = request.build()
it.proceed(actualRequest)
}
}

Given what else you have in the code, your base URL should be https://api.weatherapi.com/v1/.
forecast.json comes from the #GET annotations, and the query parameters will need to come from #Query-annotated parameters to your Retrofit interface functions.

I am trying to create a retrofit instance inside companion object I am writing this code using using by lazy{}

class RetrofitInstance {
companion object {
private val retrofit by lazy {
val logging = HttpLoggingInterceptor()
logging.setLevel(HttpLoggingInterceptor.Level.BODY)
val client = OkHttpClient.Builder()
.addInterceptor(logging)
.build()
Retrofit.Builder()
.baseUrl(BASE_URL)
.addConverterFactory(GsonConverterFactory.create())
.client(client)
.build()
}
val api by lazy {
retrofit.create(RickAndMortyServiceApi::class.java)
}
} }
Error message
"Type 'Lazy<TypeVariable(T)>' has no method 'getValue(RetrofitInstance.Companion, KProperty<*>)' and thus it cannot serve as a delegate"
Kotlin version 1.6

I have tried this code snippet on my machine, and it works fine:
companion object {
private val retrofit by lazy {
val logging = HttpLoggingInterceptor()
logging.setLevel(HttpLoggingInterceptor.Level.BODY)
val client = OkHttpClient.Builder()
.addInterceptor(logging)
.build()
Retrofit.Builder()
.baseUrl("https://www.google.com")
.addConverterFactory(GsonConverterFactory.create())
.client(client)
.build()
}
val api by lazy {
retrofit.create(DummyClass::class.java)
}
}
So i suggest you double-check your code for typos, or you can check for dependency versions. Versions that i'm using are:
implementation 'com.squareup.retrofit2:retrofit:2.9.0'
implementation 'com.squareup.retrofit2:converter-gson:2.9.0'
implementation("com.squareup.okhttp3:logging-interceptor:4.9.3")

Add Multiple #Path with retrofit call

I have an api request where in the url i need to pass multiple #Path and i did so but i keep getting an error , i would like to get some help with this issue , thank you in advance
This is sample of url
https://api.site.dev/api/v2/entries/en_US/hello
This is the retrofit setup
#Singleton
#Provides
fun provideRetrofitInstance(): ApiInterface {
val httpLoggingInterceptor = HttpLoggingInterceptor()
val interceptor = httpLoggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BASIC)
val okHttp = OkHttpClient.Builder()
.addInterceptor(interceptor)
.build()
return Retrofit.Builder()
.baseUrl("https://api.site.dev/api/v2/entries/")
.addConverterFactory(GsonConverterFactory.create())
.client(okHttp)
.build()
.create(ApiInterface::class.java)
}
This is my retrofit Call
Error Unable to create call adapter for class com.dic.mydictionnary.models.DictionnaryModelItem
for method ApiInterface.getDictionnaryWord
*This is my apiInterfac
#GET("{language_code}/{word}")
fun getDictionnaryWord(
#Path("language_code") language : String,
#Path("word") word : String,
) : DictionnaryModelItem
}

It looks like Retrofit is trying to find a way of creating a DictionnaryModelItem for your service interface. You need to change that to this:
#GET("{language_code}/{word}")
suspend fun getDictionnaryWord(
#Path("language_code") language : String,
#Path("word") word : String,
) : Response<DictionnaryModelItem>

Android make POST request with retrofit

I'm trying to make my first POST request to make the user login using retrofit library, but it's not working and i don't understand why. If i make a GET request it works, but with POST something gone wrong and i don't understand why. My API run on localhost webserver
My code of the LoginService:
private const val BASE_URL = "http://localhost:10000/api/"
/**
* Build the Moshi object that Retrofit will be using, making sure to add the Kotlin adapter for
* full Kotlin compatibility.
*/
private val moshi = Moshi.Builder()
.add(KotlinJsonAdapterFactory())
.build()
/**
* Use the Retrofit builder to build a retrofit object using a Moshi converter with our Moshi
* object.
*/
private val retrofit = Retrofit.Builder()
.addConverterFactory(MoshiConverterFactory.create(moshi))
.baseUrl(BASE_URL)
.build()
interface LoginApiService {
#Headers("Content-Type: application/json")
#POST("login")
suspend fun makeLogin(#Body usr: User): LoginResponse
}
/**
* A public Api object that exposes the lazy-initialized Retrofit service
*/
object LoginApi {
val retrofitService : LoginApiService by lazy { retrofit.create(LoginApiService::class.java) }
}
code of the LoginResponse class
data class LoginResponse(
val token: String,
val expiration: Date,
val role: Int)
code of the User class:
data class User(
val mail: String,
val pw: String
) : Parcelable
Code of the ViewModel that make the request:
private fun makeLogin(email: String, password: String) {
viewModelScope.launch {
try {
val usr = User(email, password)
val rsp = LoginApi.retrofitService.makeLogin(usr)
_isLogged.value = true
} catch (ex: Exception) {
_status.value = LoginStatus.ERROR
}
}
}
Can someone help me to solve this please? it seems that the request it's not sended.
my retrofit call generate this error in logcat in the try-catch block
java.lang.IllegalArgumentException: Unable to create converter for class com.example.ticketapp.network.LoginResponse
for method LoginApiService.makeLogin

Default Retrofit's timeout is 10sec. You can fix it like this:
val client = OkHttpClient.Builder()
.connectTimeout(30, TimeUnit.SECONDS)
.readTimeout(30, TimeUnit.SECONDS)
.writeTimeout(30, TimeUnit.SECONDS)
.build()
val retrofit = Retrofit.Builder()
...
.client(client)
.build()
Here I set it to 30secs, but you can use any number and TimeUnit you want.
UPD:
You can store Retorfit builder in a separate file like this:
interface WebService {
companion object {
fun <T> build(clazz: Class<T>): T {
val client = OkHttpClient.Builder()
...
.build()
val retrofit = Retrofit.Builder()
...
.build()
return retrofit.create(clazz)
}
}
}
Then you can have multiple ApiService interfaces. And use them like this:
val myApiService = WebService.build(MyApiServiceInterface::class.java)
myApiService.myRequestFunction()

Try to add
android:usesCleartextTraffic="true"
Into your application tag in manifest

Retrofit with kotlin, unable to create #Body

Hi i get the following error:
java.lang.IllegalArgumentException: Unable to create #Body converter for class com.jr.app.models.ExampleData (parameter #1)
Here is my ExampleData.kt
data class ExampleData(val id: String,
val firstName: String,
val secondName: String,
val profilImages: String,
val info: String) {
}
My interface retrofit
interface UsersService {
#GET("/usersProfile")
fun getAllUsers(): Call<List<ExampleData>>
#POST("/usersProfile")
fun addUser(#Body exampleData: ExampleData): Call<ResponseBody>
}
function that addsUser
override fun addUser(user: ExampleData) {
val retrofit = Retrofit.Builder().baseUrl(baseUrl).client(httpAuthClient).build();
val userService = retrofit.create(UsersService::class.java);
userService.addUser(user).enqueue(callbackResponse);
}
private val httpAuthClient: OkHttpClient
get() {
val okHttpClient = OkHttpClient().newBuilder().addInterceptor { chain ->
val originalRequest = chain.request()
val builder = originalRequest.newBuilder().header(authorizeHeader,
Credentials.basic(userName, password))
val newRequest = builder.build()
chain.proceed(newRequest)
}.build()
return okHttpClient
}

Add the gradle dependency to your project:
compile 'com.squareup.retrofit2:converter-gson:VERSION_OF_RETROFIT'
When you build an instance of retrofit add this line:
.addConverterFactory(GsonConverterFactory.create())
In your project building the retrofit object will look like:
val retrofit = Retrofit.Builder()
.baseUrl(baseUrl)
.client(httpAuthClient)
.addConverterFactory(GsonConverterFactory.create())
.build()

I believe this has nothing to do with Kotlin but your Retrofit configuration and your data class ExampleData.
Retrofit has no idea how to serialize your instance of ExampleData to JSON. You need to add a specific converter factory when creating instance of Retrofit client (see Builder#addConverterFactory method for details).