sodp5 / retrofit-unit-adapter

Retrofit CallAdapterFactory for empty body response such as code:204

UnitCallAdapterFactory

This is a library that prevents NPE(NullPointerException) from occurring when receiving a response through Retrofit especially in cases where the response like 204 has no body.

Usage

For instance, if you write a function as follows and receive a 204 response, it would typically lead to NPE

interface MyApiService {
    @GET("/path")
    suspend fun foo() // The return type is not declared as a 204 response is expected.
}

However, using this converter, it gets transformed into the Unit type, preventing the occurrence of NPE.

Retrofit.Builder()
    .baseUrl("Your Url")
    /* Add Here! */
    .addCallAdapterFactory(UnitCallAdapterFactory())
    .build()

Dependency

repositories {
    mavenCentral()
    maven { url 'https://jitpack.io' }
}

dependencies {
    implementation "com.github.sodp5:retrofit-unit-adapter:$latest_version"
}