我想知道Dagger是否有办法知道它应该在新数据可用时重新创建一个对象。
我所说的实例是我用于改造的请求标题。在某些时候(当用户登录时),我得到一个令牌,我需要将其添加到改造的标题中以进行经过身份验证的请求。问题是,我留下了相同的未经验证的改造版本。这是我的注射代码:
@Provides
@Singleton
OkHttpClient provideOkHttpClient(Cache cache) {
HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor();
interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
OkHttpClient client = new OkHttpClient.Builder()
.addInterceptor(interceptor)
.cache(cache).build();
client
.newBuilder()
.addInterceptor(
chain -> {
Request original = chain.request();
Request.Builder requestBuilder = original.newBuilder()
.addHeader("Accept", "Application/JSON");
Request request = requestBuilder.build();
return chain.proceed(request);
}).build();
return client;
}
@Provides
@Singleton
Retrofit provideRetrofit(Gson gson, OkHttpClient okHttpClient) {
Retrofit retrofit = new Retrofit.Builder()
.addConverterFactory(GsonConverterFactory.create(gson))
.addCallAdapterFactory(RxErrorHandlingCallAdapterFactory.create())
.baseUrl(mBaseUrl)
.client(okHttpClient)
.build();
return retrofit;
}
@Provides
@Singleton
public NetworkService providesNetworkService(Retrofit retrofit) {
return retrofit.create(NetworkService.class);
}
关于如何使这项工作的任何想法?
请考虑使用@oldergod提到的the approach,因为它是“官方”和更好的方式,而下面提到的方法不建议,它们可能被视为变通方法。
你有几个选择。
Retrofit
实例的组件清零,创建一个新组件并要求新的Retrofit
实例,该实例将使用必要的okhttp
实例进行实例化。SharedPreferences
中保存令牌,创建okHttp
头,这将从SharedPreferences
应用令牌读取。如果没有 - 发送没有令牌标头。static volatile String
字段,并像在第2步中那样做。为什么第二种选择不好?因为在每个请求中,您将轮询SD卡并从那里获取数据。
我个人创建了一个okhttp3.Interceptor
,它为我做了这个,我更新了一旦我有所需的令牌。它看起来像:
@Singleton
public class MyServiceInterceptor implements Interceptor {
private String sessionToken;
@Inject public MyServiceInterceptor() {
}
public void setSessionToken(String sessionToken) {
this.sessionToken = sessionToken;
}
@Override public Response intercept(Chain chain) throws IOException {
Request request = chain.request();
Request.Builder requestBuilder = request.newBuilder();
if (request.header(NO_AUTH_HEADER_KEY) == null) {
// needs credentials
if (sessionToken == null) {
throw new RuntimeException("Session token should be defined for auth apis");
} else {
requestBuilder.addHeader("Cookie", sessionToken);
}
}
return chain.proceed(requestBuilder.build());
}
}
在相应的匕首组件中,我暴露了这个拦截器,所以我可以在需要时设置sessionToken
。
这是杰克谈到的一些东西他的谈话Making Retrofit Work For You。
基于@oldergod解决方案kotlin版本具有不同的类和结构
像这样制作Retrofit实例
object RetrofitClientInstance {
private var retrofit: Retrofit? = null
private val BASE_URL = "http://yoururl"
val retrofitInstance: Retrofit?
get() {
if (retrofit == null) {
var client = OkHttpClient.Builder()
.addInterceptor(ServiceInterceptor())
//.readTimeout(45,TimeUnit.SECONDS)
//.writeTimeout(45,TimeUnit.SECONDS)
.build()
retrofit = Retrofit.Builder()
.baseUrl(BASE_URL)
.client(client)
.addConverterFactory(GsonConverterFactory.create())
.build()
}
return retrofit
}
}
像下面一样添加ServiceInterceptor
类
class ServiceInterceptor : Interceptor{
var token : String = "";
fun Token(token: String ) {
this.token = token;
}
override fun intercept(chain: Interceptor.Chain): Response {
var request = chain.request()
if(request.header("No-Authentication")==null){
//val token = getTokenFromSharedPreference();
//or use Token Function
if(!token.isNullOrEmpty())
{
val finalToken = "Bearer "+token
request = request.newBuilder()
.addHeader("Authorization",finalToken)
.build()
}
}
return chain.proceed(request)
}
}
登录界面和数据类实现
interface Login {
@POST("Login")
@Headers("No-Authentication: true")
fun login(@Body value: LoginModel): Call<LoginResponseModel>
@POST("refreshToken")
fun refreshToken(refreshToken: String):
Call<APIResponse<LoginResponseModel>>
}
data class LoginModel(val Email:String,val Password:String)
data class LoginResponseModel (val token:String,val
refreshToken:String)
在任何这样的活动中调用它
val service = RetrofitClientInstance.retrofitInstance?.create(Login::class.java)
val refreshToken = "yourRefreshToken"
val call = service?.refreshToken(refreshToken)
call?.enqueue(object: Callback<LoginResponseModel>{
override fun onFailure(call: Call<LoginResponseModel>, t: Throwable) {
print("throw Message"+t.message)
Toast.makeText(applicationContext,"Error reading JSON",Toast.LENGTH_LONG).show()
}
override fun onResponse(call: Call<LoginResponseModel>, response: Response<LoginResponseModel>) {
val body = response?.body()
if(body!=null){
//do your work
}
}
})