I’m building an Android app using Kotlin that lets users create AI-generated stories. I’ve set up the UI and now I’m trying to add the OpenAI API. I wrote the code for the API request, but the app crashes right away when I try to run it.
The error message says it can’t find the ContentNegotiation class from Ktor. Here’s what the error looks like:
java.lang.NoClassDefFoundError: Failed resolution of: Lio/ktor/client/plugins/contentnegotiation/ContentNegotiation;
I’ve already added these Ktor dependencies to my project:
implementation("io.ktor:ktor-client-core:3.0.2")
implementation("io.ktor:ktor-client-android:3.0.2")
implementation("io.ktor:ktor-client-content-negotiation:3.0.2")
implementation("io.ktor:ktor-serialization-kotlinx-json:3.0.2")
implementation("io.ktor:ktor-client-logging:3.0.2")
implementation("io.ktor:ktor-client-cio:3.0.2")
I’ve tried cleaning and rebuilding the project, and even using different versions of Ktor and Kotlin. Nothing seems to work. Do I need to do something special with content negotiation for the OpenAI API to work in Android Studio? Any ideas on how to fix this?
Hey there, I’ve actually run into a similar issue when integrating OpenAI’s API into an Android project. The error you’re seeing typically pops up when there’s a mismatch between the dependencies or if the content negotiation plugin isn’t properly set up.
First, double-check that all your Ktor dependencies are using the same version. Mixing versions can lead to unexpected errors. Also, make sure you’ve added the content negotiation plugin to your HttpClient configuration. It should look something like this:
val client = HttpClient(Android) {
install(ContentNegotiation) {
json(Json {
prettyPrint = true
isLenient = true
})
}
}
If that doesn’t solve it, try adding this line to your dependencies:
implementation("io.ktor:ktor-client-json:3.0.2")
Sometimes, this explicit JSON dependency can resolve the issue. If you’re still stuck, it might be worth checking if there are any conflicts in your Proguard rules or if multidex is enabled for your app. Hope this helps you get your story generator up and running!
I encountered a similar issue when integrating the OpenAI API into an Android project. The NoClassDefFoundError you’re seeing is often related to dependency conflicts or missing configurations.
First, ensure all your Ktor dependencies are using the same version. Then, verify that you’ve properly set up the ContentNegotiation plugin in your HttpClient configuration. It should look something like this:
val client = HttpClient(Android) {
install(ContentNegotiation) {
json()
}
}
If the issue persists, try adding the following to your app’s build.gradle file:
android {
packagingOptions {
exclude ‘META-INF/DEPENDENCIES’
exclude ‘META-INF/LICENSE’
exclude ‘META-INF/LICENSE.txt’
exclude ‘META-INF/license.txt’
exclude ‘META-INF/NOTICE’
exclude ‘META-INF/NOTICE.txt’
exclude ‘META-INF/notice.txt’
exclude ‘META-INF/ASL2.0’
}
}
This can help resolve conflicts between different libraries. If you’re still stuck, consider checking your ProGuard rules or enabling multidex for your app.
I’ve been down this road before with OpenAI API integration, and it can be a real pain. From my experience, the issue you’re facing is likely due to a mismatch in Ktor module versions or improper configuration.
First, make sure all your Ktor dependencies are on the same version. I’ve found that mixing versions can cause unexpected errors like the one you’re seeing.
Next, check your HttpClient setup. You need to explicitly install the ContentNegotiation plugin. Here’s what worked for me:
val client = HttpClient(Android) {
install(ContentNegotiation) {
json(Json {
ignoreUnknownKeys = true
prettyPrint = true
})
}
}
If you’re still hitting a wall, try adding this to your app’s build.gradle:
android {
packagingOptions {
exclude ‘META-INF/*.kotlin_module’
}
}
This helped me resolve some conflicts between libraries. Also, consider enabling multidex if you haven’t already. It can help with class loading issues in larger apps.
Lastly, if nothing else works, try a clean rebuild or even invalidate caches and restart. Sometimes Android Studio just needs a kick to get things working again.
yo, ive dealt with this before. make sure ur using the same version for all ktor dependencies. also, check if u added the content negotiation plugin to ur HttpClient setup. if not, do it like this:
val client = HttpClient(Android) {
install(ContentNegotiation) {
json()
}
}
if that doesnt work, try adding ‘implementation(“io.ktor:ktor-client-json:3.0.2”)’ to ur dependencies. good luck!