Network Requests with Retrofit in Android
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To start, open the app module’s build.gradle and add the dependency for the Moshi converter:
implementation "com.squareup.retrofit2:converter-moshi:2.9.0"
.addConverterFactory(MoshiConverterFactory.create())
@POST("user/register")
fun registerUser(@Body body: RegisterBody): Call<Unit>
@POST("user/login")
fun loginUser(@Body body: RegisterBody): Call<LoginResponse>
@GET("user")
fun getProfile(): Call<User>
@GET("sampleMovies")
fun getMovies(): Call<List<MovieReview>>
@POST("movies")
fun postReview(@Body movieReview: MovieReview): Call<MovieReview>
@JsonClass(generateAdapter = true)
data class LoginResponse(val token: String)
val body = RegisterBody(username, password, email)
apiService.registerUser(body).enqueue(object : Callback<Unit> {
override fun onResponse(call: Call<Unit>, response: Response<Unit>) {
if (response.isSuccessful) {
onResponse("Success", null)
} else {
onResponse(null, Throwable(response.message()))
}
}
override fun onFailure(call: Call<Unit>, error: Throwable) {
onResponse(null, error)
}
})
fun loginUser(
username: String,
password: String,
onResponse: (LoginResponse?, Throwable?) -> Unit
) {
val loginBody = RegisterBody(username, password)
apiService.loginUser(loginBody).enqueue(object : Callback<LoginResponse> {
override fun onResponse(call: Call<LoginResponse>, response: Response<LoginResponse>) {
if (response.isSuccessful) {
onResponse(response.body(), null)
} else {
onResponse(null, Throwable(response.errorBody()?.string()))
}
}
override fun onFailure(call: Call<LoginResponse>, error: Throwable) {
onResponse(null, error)
}
})
}
fun getMovies(onResponse: (List<MovieReview>?, Throwable?) -> Unit) {
apiService.getMovies().enqueue(object : Callback<List<MovieReview>> {
override fun onResponse(call: Call<List<MovieReview>>, response: Response<List<MovieReview>>) {
if (response.isSuccessful) {
onResponse(response.body(), null)
} else {
onResponse(null, Throwable(response.errorBody()?.string()))
}
}
override fun onFailure(call: Call<List<MovieReview>>, error: Throwable) {
onResponse(null, error)
}
})
}
@Composable
fun LoginScreen(
movieDiaryApi: MovieDiaryApi,
connectivityChecker: ConnectivityChecker,
onLogin: (LoginResponse) -> Unit,
onRegisterTapped: () -> Unit,
)
movieDiaryApi.loginUser(username, password) { loginResponse, error ->
if (loginResponse == null) {
screenScope.launch {
scaffoldState.snackbarHostState.showSnackbar(error?.message ?: "")
}
} else {
onLogin(loginResponse)
}
}
onLogin = { loginResponse ->
App.saveUserToken(loginResponse.token)
userLoggedIn = true
currentScreen = Screens.MOVIES
}