In my case, I need to change URL dynamically, but I don't want to create 2 instances of the retrofit client. I'm trying to change base URL via interceptor modifications, but retrofit still uses the old value. What am I doing wrong?
App.java
public class App extends Application {
private static AppComponent appComponent;
@Override
public void onCreate() {
super.onCreate();
appComponent =
DaggerAppComponent
.builder()
.appModule(new AppModule(this))
.build();
}
@NonNull
public static App get(@NonNull Context context) {
return (App) context.getApplicationContext();
}
public static AppComponent getAppComponent() {
return appComponent;
}
}
AppModule.java
@Module
public class AppModule {
private Context context;
public AppModule(Context context) {
this.context = context;
}
@Provides
@Singleton
Context provideContext() {
return context;
}
}
NetModule.java
@Module
public class NetModule {
@Provides
@Singleton
Gson provideGson() {
GsonBuilder gsonBuilder = new GsonBuilder();
gsonBuilder.setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES);
return gsonBuilder.create();
}
@Provides
@Singleton
MainInterceptor provideMyApiInterceptor() {
return MainInterceptor.get();
}
@Provides
@Singleton
OkHttpClient provideOkhttpClient() {
OkHttpClient.Builder client = new OkHttpClient.Builder();
client.readTimeout(15, TimeUnit.SECONDS);
client.connectTimeout(20, TimeUnit.SECONDS);
return client.build();
}
@Provides
@Singleton
Retrofit provideRetrofit(Gson gson, OkHttpClient okHttpClient) {
return new Retrofit.Builder()
.addConverterFactory(GsonConverterFactory.create(gson))
.addCallAdapterFactory(RxJava2CallAdapterFactory.create())
.baseUrl("first.url.com")
.client(okHttpClient)
.build();
}
}
NetComponent.java
@Singleton
@Component(modules = NetModule.class)
public interface NetComponent {
Retrofit getRetrofit();
MainInterceptor getInterceptor();
}
MainInterceptor.class
public class MainInterceptor implements Interceptor {
private static MainInterceptor sInterceptor;
private String mScheme;
private String mHost;
public static MainInterceptor get() {
if (sInterceptor == null) {
sInterceptor = new MainInterceptor();
}
return sInterceptor;
}
private MainInterceptor() {
}
public void setInterceptor(String url) {
HttpUrl httpUrl = HttpUrl.parse(url);
mScheme = httpUrl.scheme();
mHost = httpUrl.host();
}
@Override
public Response intercept(Chain chain) throws IOException {
Request original = chain.request();
if (mScheme != null && mHost != null) {
HttpUrl newUrl = original.url().newBuilder()
.scheme(mScheme)
.host(mHost)
.build();
original = original.newBuilder()
.url(newUrl)
.build();
}
return chain.proceed(original);
}
}
And this is the code to initialize the component in some class.
NetComponent component= DaggerNetComponent.create();
DataService service = component.getRetrofit().create(DataService.class);
MainInterceptor interceptor = component.getInterceptor();
interceptor.setInterceptor("second.url.com");
service.getSomeData();
After that, the URL is still "first.url.com"
For latest Retrofit library, you can simply use singleton instance and change it with retrofitInstance. newBuilder(). baseUrl(newUrl) . No need to create another instance.
Yes, you can create two different Service instances.
The simple way is to use @Named:
@Provides
@Singleton
@Named("retrofit_1")
Retrofit provideRetrofit1(Gson gson, OkHttpClient okHttpClient) {
return new Retrofit.Builder()
...
.baseUrl("url_1.com")
...;}
@Provides
@Singleton
@Named("retrofit_2")
Retrofit provideRetrofit2(Gson gson, OkHttpClient okHttpClient) {
return new Retrofit.Builder()
...
.baseUrl("url_2.com")
...;}
then use the same @Named:
@Provides
IApi1 provideApi_1(@Named("retrofit_1") RestAdapter adapter){....}
@Provides
IApi2 provideApi_2(@Named("retrofit_2") RestAdapter adapter){....}
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