Android Networking: Beyond the Basics

Sep 8 2022 · Kotlin 1.7.10, Android 12, Android Studio Chipmunk

Part 1: Implement Advanced Retrofit

03. Implement Logging Interceptors & Error Handling

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Previous episode: 02. Use Different Parsers Next episode: 04. Challenge: Error Handling

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When dealing with requests, you can always use more information to help you either see where the problem lies in case you receive an error, or fail to parse some data.

Demo

To add the logging interceptor, first, open the app level build.gradle, and add the following dependency:

implementation 'com.squareup.okhttp3:logging-interceptor:4.10.0'

.addInterceptor(HttpLoggingInterceptor().apply {
  level = HttpLoggingInterceptor.Level.BODY
})

sealed class Result<out T : Any>

data class Success<out T : Any>(val data: T) : Result<T>()

data class Failure(val error: Throwable?) : Result<Nothing>()

fun loginUser(userDataRequest: UserDataRequest, onUserLoggedIn: (Result<String>) -> Unit)

onUserLoggedIn(Failure(error))

...

if (loginResponse == null || loginResponse.token.isNullOrEmpty()) {
  onUserLoggedIn(Failure(NullPointerException("No response body!")))
} else {
  onUserLoggedIn(Success(loginResponse.token))
}

remoteApi.loginUser(userDataRequest) { result ->
  if (result is Success) {
    onLoginSuccess(result.data)
  } else {
    showLoginError()
  }
}