Styjun

I need change the URL base in retrofit, i'm using koin to create a retrofit module on app startup and i want change this url in runtime.

I already tried change the baseUrl("http://192.168.192.168/") to baseUrl("http://")and change the url on retrofit call but my app crashs and return illegal URL error.

This is my fun to create the builder

fun createRetrofit(okHttpClient: OkHttpClient): Retrofit 
 return Retrofit.Builder()
 .baseUrl("http://192.168.192.168/")//i need change this at runtime
 .client(okHttpClient)
 .addConverterFactory(GsonConverterFactory.create()) .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
.build()

create a bean to my module

val retrofitModule: Module = applicationContext 
 bean createRetrofit(get()) 

and start the koin:

startKoin(application = this,
 modules = listOf(retrofitModule, ...)
)

someone can i help me with this?

you must have to add these lines in your code:

First Step:
Add the new CallAdapter RxJavaCallAdapterFactory.create() when building a Retrofit instance.

public static final String BASE_URL = "http://google.com/";
public static Retrofit getClient(String baseUrl) 
 if (retrofit==null) 
 retrofit = new Retrofit.Builder()
 .baseUrl(baseUrl)
 .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
 .addConverterFactory(GsonConverterFactory.create())
 .build();
 
 return retrofit;

Next step:
Update the APIService for example:-> savePost(String title, String body, String userId) method to become an Observable.

public interface APIService 
 @GET
 Call<ResponseBody> list(@Url String url);
//or

@POST("/posts")
@FormUrlEncoded
Observable<Post> savePost(@Field("title") String title,
 @Field("body") String body,
 @Field("userId") long userId);

Final step:
When making the requests, our anonymous subscriber responds to the observable's stream which emits event.

public void sendPost(String title, String body) 

 // RxJava
 mAPIService.savePost(title, body, 1).subscribeOn(Schedulers.io()).observeOn(AndroidSchedulers.mainThread())
 .subscribe(new Subscriber<Post>() 
 @Override
 public void onCompleted() 

 

 @Override
 public void onError(Throwable e) 

 

 @Override
 public void onNext(Post post) 
 showResponse(post.toString());
 
 );

this is way you build your dynamic urls: want to learn more details full description link: Sending Data With Retrofit 2 HTTP Client for Android

and See base URL for details of how the value will be resolved against a base URL to create the full endpoint URL.

if you are doing using kotlin: follow this link. dynamic urls at Runtime with Retrofit 2

I already tried change the baseUrl("http://192.168.192.168/") to baseUrl("http://")and change the url on retrofit call but my app crashs and return illegal URL error.

You can leave it as a baseUrl if you use @URL it will overwrite the one on yout Retrofit.Builder()

You can use @URL parameter to change the endpoint dynamically.

@GET
fun getUsers(@Url String url) : Observable<UserResponse>