No more Retrofit, move to Ktor on Android — Logging and Interceptor

Photo by Jordan Harrison on Unsplash

In the previous article here, we see how to implement Ktor on Android, now we focus on Logging and Interceptor.

Logging

First, add the logging dependencies in build.gradle:

implementation "io.ktor:ktor-client-logging:$ktor_version"

Next, we have to install Logging on HttpClient :

install(Logging) {
    logger = Logger.DEFAULT
    level = LogLevel.ALL
}

• Logger.DEFAULT uses an SLF4J logging framework. For Native targets, set this property to Logger.SIMPLE.
• The level property specifies the logging level.

Extra

To see log displayed on Logcat you should use Logger.SIMPLE, but it is possible to create a CustomHttpLogger to customize logger messages. Here the CustomHttpLogger class:

class CustomHttpLogger : Logger {
    override fun log(message: String) {
        Log.d("loggerTag", message)
    }
}

We have to install it on HttpClient:

install(Logging) {
    logger = CustomHttpLogger()
    level = LogLevel.ALL
}

Interceptor