无法解析方法 'sumDouble(io.reactivex.Observable<java.lang.Double>)'

Question

在Activity中：

Double price = o.getDouble ( "totalprice" );

Observable<Double> floatObservable = Observable.just(price);

MathObservable
       .sumDouble(floatObservable)
       .subscribe(new Observer<Integer>() {
       @Override
       public void onSubscribe(Disposable d) {

       }

       @Override
       public void onNext(Integer integer) {
             System.out.println("Sum: " + integer);
       }

       @Override
       public void onError(Throwable e) {

       }

       @Override
       public void onComplete() {

       }
});

Gradle :

implementation 'io.reactivex.rxjava2:rxandroid:2.1.1'
implementation 'io.reactivex:rxjava-math:1.0.0'

行发生错误：

.sumDouble(floatObservable)

错误：

Cannot resolve method 'sumDouble(io.reactivex.Observable)'

Answer 1

在你的app.gradle中添加依赖项

  implementation "com.github.akarnokd:rxjava2-extensions:0.20.8"

然后

 Observable<Double> floatObservable = Observable.just(1.2,1.3);

    MathObservable
            .sumDouble(floatObservable)
            .subscribe(new Observer<Double>() {
                @Override
                public void onSubscribe(Disposable d) {

                }

                @Override
                public void onNext(Double aDouble) {
                    System.out.println("Sum: " + aDouble);
                   //if you want int convert here
                }

                @Override
                public void onError(Throwable e) {

                }

                @Override
                public void onComplete() {

                }
            });

它工作正常..答案是 2.5

无法解析方法 'sumDouble(io.reactivex.Observable<java.lang.Double>)'

Cannot resolve method 'sumDouble(io.reactivex.Observable<java.lang.Double>)'

android

observable

rx-java

reactivex

rx-java2