Get Data from the Internet

[Takahiro-Tsuji]

URL of codelab:
https://developer.android.com/codelabs/basic-android-kotlin-compose-getting-data-internet?hl=en#7

Specify the language of the codelab if it is not English:

In which task and step of the codelab can this issue be found?
8. Parse the JSON response with kotlinx.serialization

Describe the problem
java.lang.IllegalArgumentException: Unable to create converter for java.util.List<com.example.marsphotos.network.MarsPhoto>
for method MarsApiService.getPhotos

Steps to reproduce?

1. Run the app.
2. When the app faces FATAL EXCEPTION, see the logcat.

Versions
_Android Studio version:_Android Studio Meerkat | 2024.3.1 Patch 2
_API version of the emulator:_Nexus 5X

Additional information
Include screenshots if they would be useful in clarifying the problem.
According to https://note.com/haine_rion23/n/n3a7c40c015da, I have changed the "org.jetbrains.kotlin.plugin.serialization" version to 1.9.10. It works but I cannot see why it is solved and would know how to review the update history of this plugin.

[nickwhitley]

Solution

I was able to resolve this issue by removing the implementation("com.jakewharton.retrofit:retrofit2-kotlinx-serialization-converter:1.0.0") library dependency and added the following library dependency.

    // gson converter
    implementation("com.squareup.retrofit2:converter-gson:2.11.0")

After the syncing this library, I've made following change to the retrofit instance creation in MarsApiService.kt file:

import retrofit2.converter.gson.GsonConverterFactory

private val retrofit = Retrofit.Builder()
    .baseUrl(BASE_URL)
    .addConverterFactory(GsonConverterFactory.create())
    .build()

Then it starts working and able to convert JSON string array to data class MarsPhoto