我正在使用带有 Rx java 的 Retrofit 并且我在 onNext 中获取身份验证令牌的值。根据 onNext 的结果,我必须通过在自定义标头中添加令牌来将数据发布到服务器。我是否应该在 on next 中编写所有代码,是否可以从 onNext 返回一个值,以便何时值可用?
public String getToken() {
Retrofit retrofit = new Retrofit.Builder()
.baseUrl("https://abc.efg.com/")
.addConverterFactory(ScalarsConverterFactory.create())
.addCallAdapterFactory(RxJavaCallAdapterFactory.create())
.build();
GetTokenInterface service = retrofit.create(GetTokenInterface.class);
Observable<String> response_call = service.getToken1(setAPI_KEY, setaccesstoken);
response_call.subscribeOn(Schedulers.newThread())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Subscriber<String>() {
@Override
public void onCompleted() {
System.out.print("Complete");
}
@Override
public void onError(Throwable e) {
System.out.print("Fail");
}
@Override
public void onNext(String token) {
authentication_token = token; //getting correct value here
}
});
return authentication_token;
}
}
然后在另一个班级:
generated_token = getToken();
但我得到了 generate_token null 因为值不可用 有没有办法在其中获取值?我必须使用这个值来发布或者我需要在 onNext() 中结合 post observable 吗?
RxJava 代码是异步执行的。例如
public class Foo {
String value = "a";
public String getFoo() {
value = "a"; // This executes first
Observable.just(value + "a")
.observeOn(Schedulers.io())
.subscribe(new Action1<String>() {
public void call(String v) {
value = v; // This is called later on IO thread.
}
}); // This creates the observable and schedules execution on IO thread.
return value; // Return value "a"
}
}
Foo foo = new Foo();
foo.getFoo(); // Return a
Thread.sleep(100);
foo.getFoo(); // likley Return `aa` (depends upon how long the IO thread take to run)
Thread.sleep(100);
foo,getFoo(); // likley Return `aaa` (depends upon how long the IO thread take to run)
如果你想从你的方法 getToken 中获取一个值,你可以返回,Observable<String>
如果你想你也可以将令牌保存在你的类中,如下所示。
public class TokenService {
Retrofit retrofit = new Retrofit.Builder()
.baseUrl("https://abc.efg.com/")
.addConverterFactory(ScalarsConverterFactory.create())
.addCallAdapterFactory(RxJavaCallAdapterFactory.create())
.build();
GetTokenInterface service = retrofit.create(GetTokenInterface.class); // This should be done outside of the method for performance
String savedToken;
public Observable<String> refreshToken() {
return service.getToken1(setAPI_KEY, setaccesstoken)
.subscribeOn(Schedulers.newThread())
.doOnNext(new Action1<String() {
public void call(String token) {
savedToken = token;
}
}) // Do want is needed with token
.observeOn(AndroidSchedulers.mainThread());
}
public String getSavedToken() {
return savedToken;
}
}
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