RxJava Single Observable|极客教程

RxJava Single Observable

Single类代表单个值的响应。单个可观察对象只能发出一个成功的值或一个错误。它不会发出onComplete事件。

类声明

下面是 **io.reactivex.Single ** 类的声明−

public abstract class Single<T>
   extends Object
      implements SingleSource<T>

协议

以下是Single Observable操作的顺序协议：

onSubscribe (onSuccess | onError)?

单个示例

使用你选择的任何编辑器，在C:> RxJava创建以下Java程序。

ObservableTester.java

import java.util.concurrent.TimeUnit;

import io.reactivex.Single;
import io.reactivex.disposables.Disposable;
import io.reactivex.observers.DisposableSingleObserver;
import io.reactivex.schedulers.Schedulers;

public class ObservableTester  {
   public static void main(String[] args)  throws InterruptedException {
      //Create the observable
      Single<String> testSingle = Single.just("Hello World");

      //Create an observer
      Disposable disposable = testSingle
         .delay(2, TimeUnit.SECONDS, Schedulers.io())
         .subscribeWith(
         new DisposableSingleObserver<String>() {

         @Override
         public void onError(Throwable e) { 
            e.printStackTrace();
         }

         @Override
         public void onSuccess(String value) {
            System.out.println(value);
         }
      }); 
      Thread.sleep(3000);
      //start observing
      disposable.dispose();
   }
}