Develop Reference

How to handle multiple response with retrofit - Android

With retrofit I get response LevelsEntity but if I get error it get me ResponseError, NOTE: I cant merge LevelsEntity and ResponseError together in one entity.
LevelsEntity:
class LevelsEntity : ArrayList<LevelsEntityItem>()
LevelsEntityItem:
data class LevelsEntityItem(
#SerializedName("category")
val category: Int? = null,
#SerializedName("completed")
val completed: Boolean? = null,
#SerializedName("completionhascriteria")
val completionhascriteria: Boolean? = null
)
ResponseError:
data class ResponseError(
#SerializedName("errorcode")
val errorcode: String? = null,
#SerializedName("exception")
val exception: String? = null,
#SerializedName("message")
val message: String? = null
)
And I create bellow class for get multiple data like bellow:
class BaseLevelsEntity<LevelsEntity, ResponseError> {
var levelsEntity: LevelsEntity? = null
var responseError: ResponseError? = null
val isSuccess: Boolean
get() = responseError == null
}
And in my #POST of retrofit is:
#POST("/webservice/rest/server.php")
suspend fun getPopularLevelsInLessonsF(
#Query("mdwsrestformat") mdwsrestformat: String?,
#Field("wsfunction") wsfunction: String?,
#Field("wstoken") wstoken: String?,
#Field("userid") userid: Int?
): Call<BaseLevelsEntity<LevelsEntity, ResponseError>>
But I cant get any result in my impl:
class LessonsRepositoryImpl(
private val lessonsRemoteDatasource: LessonsRemoteDatasource
) : LessonsRepository {
override suspend fun getLevelsInLessonsF(
wstoken: String,
userid: Int
): Resource<BaseLevelsEntity<LevelsEntity, ResponseError>> {
return responseToResource(lessonsRemoteDatasource.getLevelsValueInLessonsF(wstoken, userid).execute())
}
private fun responseToResource(response: Response<BaseLevelsEntity<LevelsEntity, ResponseError>>): Resource<BaseLevelsEntity<LevelsEntity, ResponseError>> {
if (response.isSuccessful) {
if (response.body() != null) {
response.body()?.let { result ->
if (!result.levelsEntity.isNullOrEmpty()) {
if (result.levelsEntity!!.size > 0) {
return Resource.Success(result)
}
} else if (result.responseError != null) {
return Resource.Error(result.responseError?.errorcode ?: "unknown")
}
}
} else {
return Resource.Error("unknown_info")
}
}
return Resource.Error(response.message())
}
}

Normally response should be in common format.
If cannot do this from backend then you can receive response as JsonObject and then check the key manually in repository to decide if it is success or error response. Based on that you can then convert the response to object with gson.

How to load JSON data with square bracket

I'm calling data from Breaking bad API https://www.breakingbadapi.com/api/character/random
I'm unable to get data. I think it's because the main Response file has square brackets that I need to call first. But I don't know how to call it. Can I get some help?
Here's my API interface
interface APIRequest {
#GET("character/random")
suspend fun getInfo() : Response<List<ResponseBB>>
}
ResponseBB Class
data class ResponseBB(
#field:SerializedName("ResponseBB")
val responseBB: List<ResponseBBItem?>? = null
)
data class ResponseBBItem(
#field:SerializedName("birthday")
val birthday: Any? = null,
#field:SerializedName("img")
val img: String? = null,
#field:SerializedName("better_call_saul_appearance")
val betterCallSaulAppearance: Any? = null,
#field:SerializedName("occupation")
val occupation: List<String?>? = null,
#field:SerializedName("appearance")
val appearance: List<Int?>? = null,
#field:SerializedName("portrayed")
val portrayed: String? = null,
#field:SerializedName("name")
val name: String? = null,
#field:SerializedName("nickname")
val nickname: String? = null,
#field:SerializedName("char_id")
val charId: Int? = null,
#field:SerializedName("category")
val category: String? = null,
#field:SerializedName("status")
val status: String? = null
)
Client object
object Client {
val gson = GsonBuilder().create()
val retrofit = Retrofit.Builder()
.baseUrl("https://www.breakingbadapi.com/api/")
.addConverterFactory(GsonConverterFactory.create(gson))
.build()
val api = retrofit.create(APIRequest::class.java)
}
Here's my function to call result in the main activity
class MainActivity : AppCompatActivity() {
private var TAG = "MainActivity"
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
getCharacterInfo()
linearLayout.setOnClickListener {
getCharacterInfo()
}
}
private fun getCharacterInfo() {
GlobalScope.launch(Dispatchers.IO) {
try {
val response = Client.api.getInfo()
if (response.isSuccessful) {
val data = response.body()
Log.d(TAG, data.toString())
withContext(Dispatchers.Main) {
Picasso.get().load(data!!.img).into(ivImage)
tvName.text = data.name
tvOccupation.text = data.toString()
tvActor.text = data.toString()
tvAppearance.text = data.appearance.toString()
tvStatus.text = data.status
}
}
}
catch (e:Exception){
withContext(Dispatchers.Main){
Toast.makeText(applicationContext, "Cannot Load Data" , Toast.LENGTH_LONG).show()
}
}
}
}
}

I see that you try to use coroutines in retrofit, I recommend that you do not work with Response, change it to call and remove the suspend.
interface APIRequest {
#GET("character/random")
fun getInfo() : Call<List<ResponseBB>>
}
In your Global Scope you can call it this way:
GlobalScope.launch {
try{
val response = Client.api.getInfo().await()
}catch(e:Exception){}
}
you can use the version 2.9.0 in retrofit and gson Converter

Unable to invoke no-args constructor for retrofit2.Call MVVM Coroutines Retrofit

I want to use coroutines in my project only when I use coroutines I get the error :Unable to invoke no-args constructor. I don't know why it's given this error. I am also new to coroutines.
here is my apiclient class:
class ApiClient {
val retro = Retrofit.Builder()
.baseUrl(Constants.BASE_URL)
.addConverterFactory(GsonConverterFactory.create())
.build()
}
Here is my endpoint class:
#GET("v2/venues/search")
suspend fun get(
#Query("near") city: String,
#Query("limit") limit: String = Constants.limit,
#Query("radius") radius: String = Constants.radius,
#Query("client_id") id: String = Constants.clientId,
#Query("client_secret") secret: String = Constants.clientSecret,
#Query("v") date: String
): Call<VenuesMainResponse>
my Repository class:
class VenuesRepository() {
private val _data: MutableLiveData<VenuesMainResponse?> = MutableLiveData(null)
val data: LiveData<VenuesMainResponse?> get() = _data
suspend fun fetch(city: String, date: String) {
val retrofit = ApiClient()
val api = retrofit.retro.create(VenuesEndpoint::class.java)
api.get(
city = city,
date = date
).enqueue(object : Callback<VenuesMainResponse>{
override fun onResponse(call: Call<VenuesMainResponse>, response: Response<VenuesMainResponse>) {
val res = response.body()
if (response.code() == 200 && res != null) {
_data.value = res
} else {
_data.value = null
}
}
override fun onFailure(call: Call<VenuesMainResponse>, t: Throwable) {
_data.value = null
}
})
}
}
my ViewModel class:
class VenueViewModel( ) : ViewModel() {
private val repository = VenuesRepository()
fun getData(city: String, date: String): LiveData<VenuesMainResponse?> {
viewModelScope.launch {
try {
repository.fetch(city, date)
} catch (e: Exception) {
Log.d("Hallo", "Exception: " + e.message)
}
}
return repository.data
}
}
part of activity class:
class MainActivity : AppCompatActivity(){
private lateinit var venuesViewModel: VenueViewModel
private lateinit var adapter: HomeAdapter
private var searchData: List<Venue>? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
val editText = findViewById<EditText>(R.id.main_search)
venuesViewModel = ViewModelProvider(this)[VenueViewModel::class.java]
venuesViewModel.getData(
city = "",
date = ""
).observe(this, Observer {
it?.let { res ->
initAdapter()
rv_home.visibility = View.VISIBLE
adapter.setData(it.response.venues)
searchData = it.response.venues
println(it.response.venues)
}
})
this is my VenuesMainResponse data class
data class VenuesMainResponse(
val response: VenuesResponse
)

I think the no-args constructor warning should be related to your VenuesMainResponse, is it a data class? You should add the code for it as well and the complete Log details
Also, with Coroutines you should the change return value of the get() from Call<VenuesMainResponse> to VenuesMainResponse. You can then use a try-catch block to get the value instead of using enqueue on the Call.
Check this answer for knowing about it and feel free to ask if this doesn't solve the issue yet :)
UPDATE
Ok so I just noticed that it seems that you are trying to use the foursquare API. I recently helped out someone on StackOverFlow with the foursquare API so I kinda recognize those Query parameters and the Venue response in the code you provided above.
I guided the person on how to fetch the Venues from the Response using the MVVM architecture as well. You can find the complete code for getting the response after the UPDATE block in the answer here.
This answer by me has code with detailed explanation for ViewModel, Repository, MainActivity, and all the Model classes that you will need for fetching Venues from the foursquare API.
Let me know if you are unable to understand it, I'll help you out! :)
RE: UPDATE
So here is the change that will allow you to use this code with Coroutines as well.
Repository.kt
class Repository {
private val _data: MutableLiveData<mainResponse?> = MutableLiveData(null)
val data: LiveData<mainResponse?> get() = _data
suspend fun fetch(longlat: String, date: String) {
val retrofit = Retro()
val api = retrofit.retro.create(api::class.java)
try {
val response = api.get(
longLat = longlat,
date = date
)
_data.value = response
} catch (e: Exception) {
_data.value = null
}
}
}
ViewModel.kt
class ViewModel : ViewModel() {
private val repository = Repository()
val data: LiveData<mainResponse?> = repository.data
fun getData(longLat: String, date: String) {
viewModelScope.launch {
repository.fetch(longLat, date)
}
}
}
api.kt
interface api {
#GET("v2/venues/search")
suspend fun get(
#Query("ll") longLat: String,
#Query("client_id") id: String = Const.clientId,
#Query("client_secret") secret: String = Const.clientSecret,
#Query("v") date: String
): mainResponse
}
MainActivity.kt
private val viewModel by viewModels<ViewModel>()
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
viewModel.getData(
longLat = "40.7,-74",
date = "20210718" // date format is: YYYYMMDD
)
viewModel.data
.observe(this, Observer {
it?.let { res ->
res.response.venues.forEach { venue ->
val name = venue.name
Log.d("name ",name)
}
}
})
}
}

populate spinner with retrofit and moshi

i am beginner in android dev (both java or kotlin). I am trying to populate spinner from json with retrofit and moshi but I have no idea how to populate it into spinner. to be honest I dont know whether the return of Json data is correct or not, since Log.d() return is not detail as dump() laravel or php.
script in activity onCreate (Please read the comment of the script, i put debug result of Log.d() there):
val task = object : AsyncTask<Void, Void, Response<List<ProductTypeResponse>>>() {
override fun doInBackground(vararg params: Void): Response<List<ProductTypeResponse>> {
val typeAPI = RestAPI()
val callResponse = typeAPI.getNews()
val response = callResponse.execute()
return response
}
override fun onPostExecute(response: Response<List<ProductTypeResponse>>) {
if (response.isSuccessful) {
val news = response.body()
Log.d("test:", news!![0].data.toString()) // method 'java.lang.String com.example.mockie.tigaer.api.TypeDataResponse.toString()' on a null object reference
Log.d("test:", news!!.size.toString()) // it says 67 but the data from the url is 63 array of json object
Log.d("test:", news!![0].toString()) // com.example.mockie.tigaer.api.ProductTypeResponse#f17fd5e
}
}
RestApi.kt
import retrofit2.Call
import retrofit2.Retrofit
import retrofit2.converter.moshi.MoshiConverterFactory
class RestAPI() {
private val tigaerApi: TigaerApi
init {
val retrofit = Retrofit.Builder()
.baseUrl("http://app.tigaer.id/laravel/")
.addConverterFactory(MoshiConverterFactory.create())
.build()
tigaerApi = retrofit.create(TigaerApi::class.java)
}
fun getNews(): Call<List<ProductTypeResponse>> {
return tigaerApi.getTop()
}
}
ApiModel.kt
package com.example.mockie.tigaer.api
class ProductTypeResponse(val data: TypeDataResponse)
class TypeDataResponse(
val children: List<ProductTypeChildrenResponse>
)
class ProductTypeChildrenResponse(val data: ProductTypeDataResponse)
class ProductTypeDataResponse(
val productType: String,
val readable: String
)
TigaerApi.kt
import retrofit2.Call
import retrofit2.http.GET
import retrofit2.http.Query
interface TigaerApi {
#GET("api/type")
fun getTop(): Call<List<ProductTypeResponse>>
}
return Json: https://jsoneditoronline.org/?id=ce90c41b859218e746e41d64eddb4c30
so my questions are :
is there any function to debug object/array as detail as in laravel ?
how to populate my json return data into spinner?

Here is code for same, I modified and integrate in your code only:
"MainActivity.kt" class:
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
var spinner: Spinner = findViewById(R.id.spinner)
val task = object : AsyncTask<Void, Void, Response<List<ProductTypeDataResponse>>>() {
override fun doInBackground(vararg params: Void): Response<List<ProductTypeDataResponse>> {
val typeAPI = RestAPI()
val callResponse = typeAPI.getNews()
val response = callResponse.execute()
return response
}
override fun onPostExecute(response: Response<List<ProductTypeDataResponse>>) {
if (response.isSuccessful) {
val news: List<ProductTypeDataResponse>? = response.body()
var adapter: SpinnerAdapter = SpinnerAdapter(this#MainActivity, news!!);
spinner.adapter=adapter
}
}
}.execute()
}
}
Now Layout "activity_main":
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.ankitpatidar.checkkotlin.MainActivity">
<Spinner
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/spinner"></Spinner>
</LinearLayout>
Now Spinner Adapter as "SpinnerAdapter":
class SpinnerAdapter internal constructor(internal var context: Context, internal var list: List<ProductTypeDataResponse>) : BaseAdapter() {
override fun getCount(): Int {
return list.size
}
override fun getItem(i: Int): Any? {
return null
}
override fun getItemId(i: Int): Long {
return 0
}
override fun getView(i: Int, view: View?, viewGroup: ViewGroup): View {
var view = view
if (view == null) {
val inflater = LayoutInflater.from(context)
view = inflater.inflate(R.layout.item, viewGroup, false)
}
val textView = view!!.findViewById<TextView>(R.id.textView)
textView.text = list[i].productType + " " + list[i].readable
return textView
}
}
Spinner item layout as "item":
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/textView"/>
</LinearLayout>
Now some changes in your existing files:
"ApiModel.kt":
class TypeDataResponse(
val children: List<ProductTypeChildrenResponse>
)
class ProductTypeChildrenResponse(val data: ProductTypeDataResponse)
class ProductTypeDataResponse(
val productType: String,
val readable: String
)
"RestAPI.kt"
class RestAPI() {
private val tigaerApi: TigaerApi
init {
val retrofit = Retrofit.Builder()
.baseUrl("http://app.tigaer.id/laravel/")
.addConverterFactory(MoshiConverterFactory.create())
.build()
tigaerApi = retrofit.create(TigaerApi::class.java)
}
fun getNews(): Call<List<ProductTypeDataResponse>> {
return tigaerApi.getTop()
}
}
Hence it will work for you.

is there any function to debug object/array as detail as in laravel ?
Go through this to run your app in debug mode. https://developer.android.com/studio/debug/index.html
You can always use breakpoints to evaluate expressions while the app is running. Instead of logging put a breakpoint at this line.
val news = response.body()
so when you'll receive a response from server, app will stop at this point and you can check what you are getting in response in detail.
how to populate my json return data into spinner?
If you are getting response from server in Json format as shown in provided link, you'll have to parse the data into a list of objects(POJO).
And then you have to forward this data(maybe you'll have to iterate over list to get the required data because you have two fields in each object) into an adapter and set that adapter to your spinner. It is explained very clearly at following link.
https://developer.android.com/guide/topics/ui/controls/spinner.html

I got an idea in this post, maybe my logic can help anyone in here
this is my JSON
{
"success": 1,
"dataset": [
{
"id": "3",
"nama": "Rush"
},
{
"id": "5",
"nama": "Avanza"
},
{
"id": "6",
"nama": "Innova"
},
{
"id": "14",
"nama": "Sienta"
},
{
"id": "15",
"nama": "Alphard"
},
{
"id": "16",
"nama": "Calya"
}
],
"sql_duration": 0.0013179779052734375,
"auth_duration": 1.9073486328125e-6,
"req_duration": 0.004480123519897461,
"debug_duration": []
}
this is my API Service
ApiMain.kt
class ApiMain : Application(){
private var BASE_URL = "your url in here"
private val client = OkHttpClient().newBuilder()
.addInterceptor(HttpLoggingInterceptor().apply {
level = if (BuildConfig.DEBUG) HttpLoggingInterceptor.Level.BODY else HttpLoggingInterceptor.Level.NONE
})
.readTimeout(30, TimeUnit.SECONDS)
.writeTimeout(30, TimeUnit.SECONDS)
.build()
private val retrofit = Retrofit.Builder()
.baseUrl(BASE_URL)
.client(client)
.addConverterFactory(GsonConverterFactory.create())
.build()
val services: ApiServices = retrofit.create(ApiServices::class.java)
}
and this is my API service
ApiServices.kt
interface ApiServices {
#GET("yourlink")
fun MerkKendaraan():Call<MerkKendaraan>
}
and this is my model
kendaraan.kt
data class MerkKendaraan(
#SerializedName("success")
#Expose
var success: Int? = null,
#SerializedName("dataset")
#Expose
var dataset: List<MerkMobil>? = null,
#SerializedName("sql_duration")
#Expose
var sql_duration: String? = null,
#SerializedName("auth_duration")
#Expose
var auth_duration: String? = null,
#SerializedName("req_duration")
#Expose
var req_duration: String? = null
)
data class MerkMobil(
#SerializedName("id")
#Expose
var id: String? = null,
#SerializedName("nama")
#Expose
var nama: String? = null
)
and this is my main activity
AddKendaraan
class AddKendaraan : AppCompatActivity() {
private var merk : ArrayList<MerkMobil> = ArrayList()
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_add_kendaraan)
configspinnermobil()
}
private fun configspinnermobil() {
val spinner: Spinner = findViewById(R.id.spinnerMerk)
ApiMain().services.MerkKendaraan().enqueue(object :
Callback<MerkKendaraan> {
override fun onResponse(call: Call<MerkKendaraan>, response: Response<MerkKendaraan>) {
//Tulis code jika response sukses
Log.d("data api", "data masuk")
if(response.code() == 200){
merk = response.body()?.dataset as ArrayList<MerkMobil>
var data : MutableList<String> = ArrayList()
merk.forEach {
data.add(0,it.nama.toString())
}
spinner.adapter = ArrayAdapter<String>(this#AddKendaraan, R.layout.support_simple_spinner_dropdown_item, data)
}else{
}
}
override fun onFailure(call: Call<MerkKendaraan>, t: Throwable){
//Tulis code jika response fail
Toast.makeText(applicationContext, t.message, Toast.LENGTH_LONG).show()
Log.d("data api", "data tidak masuk")
}
})
}

No args error retrofit request body

I am facing problem while sending json object body using retrofit to the server. Below is the error.
Failed to invoke public
com.nitesh.brill.saleslines._User_Classes.User_PojoClass.UpdatePreviousDetails()
with no args
code snippet
// Api endpoint
#Headers("Content-Type: application/json")
#POST("UpdatePreviousDetails/{Id}")
fun updatePreviousDetails(#Path("Id") Id: Int, #Body updateDetails :UpdatePreviousDetails): Call<UpdatePreviousDetails>
//pojo class
package com.nitesh.brill.saleslines._User_Classes.User_PojoClass
import java.util.*
/**
* Created by Nitesh Android on 16-08-2017.
*/
class UpdatePreviousDetails(
var CompanyName: String? = null!!,
var Designation: String? = null!!,
var DateOfJoin: Date? = null!!,
var DateOfLeaving: Date? = null!!,
var SectorPreviouslyWorked: String? = null!!,
var Id: Int? = null!!
) {
}
//sending data
val details = UpdatePreviousDetails("rr", "asm", date, date, "Pharmaceuticals",3)
val call = apiEndpointInterface!!.updatePreviousDetails(5, details)
call.enqueue(object :Callback<UpdatePreviousDetails> {
override fun onResponse(call: Call<UpdatePreviousDetails>?, response: Response<UpdatePreviousDetails>?) {
objUsefullData.showSnackBar("success")
UsefullData.Log("============="+response!!.body().toString())
}
override fun onFailure(call: Call<UpdatePreviousDetails>?, t: Throwable?) {
objUsefullData.showSnackBar("fail")
UsefullData.Log("============="+t)
}
})
I am using kotlin language

Your UpdatePreviousDetails class has to have a constructor with no params to enable Gson (inside Retrofit) to convert your object into JSON.
EDIT
class UpdatePreviousDetails() {
var CompanyName: String? = null
var Designation: String? = null
var DateOfJoin: Date? = null
var DateOfLeaving: Date? = null
var SectorPreviouslyWorked: String? = null
var Id: Int? = null
constructor(
CompanyName: String?,
Designation: String?,
DateOfJoin: Date?,
DateOfLeaving: Date?,
SectorPreviouslyWorked: String?,
Id: Int?
) : this() {
this.CompanyName = CompanyName
this.Designation = Designation
this.DateOfJoin = DateOfJoin
this.DateOfLeaving = DateOfLeaving
this.SectorPreviouslyWorked = SectorPreviouslyWorked
this.Id = Id
}
}