Rxjava2-Android-Samlpes（一）
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发布日期:   2018-11-30
文章字数:   7.8k
阅读时长:   43 分
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  • 最近工作不那么忙，计划重新搭建一个MVP架构！基于Rxjava2-Rxandroid首先掌握RxJava2的使用的方式！
  • 此文章是根据老外amitshekhariitbhu的RxJava2-Android-SamplesDemo 改装而成，是个翻译版本，足够应付对RxJava2的全部姿势！
  • GitHub地址： RxJava2-Android-Samples
    • Map - >通过对每个项应用函数来变换Observable发出的项
    • Zip - >通过指定的函数将多个Observable的排放组合在一起，并根据此函数的结果为每个组合发出单个项目
      • Filter - >仅发出通过谓词测试的Observable中的那些项
    • FlatMap - >将Observable发出的项目转换为Observables，然后将这些项目的排放量变为单个Observable
    • Take - >仅发出Observable发出的前n项
    • Reduce - >按顺序将一个函数应用于Observable发出的每个项目，并发出最终值
    • Skip - >抑制Observable发出的前n项
    • Buffer - >定期将Observable发出的项目收集到bundle中并发出这些bundle而不是一次发送一个项目
    • Concat - >从两个或多个Observable发射发射而不交错
    • Replay - >确保所有观察者看到相同的发射物品序列，即使他们在Observable开始发射物品后订阅
    • Merge - >通过合并它们的排放将多个Observable组合成一个
    • SwitchMap - >将Observable发出的项目变换为Observables，并镜像最近转换的Observable发出的项目

Operators

  • 1、 简单的一个顺序执行的Demo

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    /*
        * 一个一个地发出两个值的简单例子
        */
       private void doSomeWork() {
           getObservable()
                   // 在后台线程上运行
                   .subscribeOn(Schedulers.io())
                   // 在主线程上被通知
                   .observeOn(AndroidSchedulers.mainThread())
                   .subscribe(getObserver());
       }

       private Observable<String> getObservable() {
           return Observable.just("1", "2","3","4","5","6");
       }

  • d.dispose(); todo 如果这个方法放开的话，就不会往下面走了

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    private Observer<String> getObserver() {
           return new Observer<String>() {
               /**
                *
                *为观察者提供取消（处理）的方法。
                *连接（通道）和可观察到的两个
                *同步（从{{Link Lang-OnNeXT（object）}）和异步方式。
                */
               @Override
               public void onSubscribe(Disposable d) {
                   Log.d(TAG, " onSubscribe : " + d.isDisposed());
                   //处理资源，操作应该是幂等的。
                   //d.dispose();  todo 如果这个方法放开的话，就不会往下面走了

               }

               @Override
               public void onNext(String value) {
                   Log.d(TAG, " onNext : value : " + value);
               }

               @Override
               public void onError(Throwable e) {
                   Log.d(TAG, " onError : " + e.getMessage());
               }

               @Override
               public void onComplete() {
                   Log.d(TAG, " onComplete");
               }
           };
       }

  • 输出结果

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    11-30 10:03:17.883 16586-16586/com.rxjava2.android.samples D/SimpleExampleActivity:  onSubscribe : false
    11-30 10:03:17.923 16586-16586/com.rxjava2.android.samples D/SimpleExampleActivity:  onNext : value : 1
    11-30 10:03:17.931 16586-16586/com.rxjava2.android.samples D/SimpleExampleActivity:  onNext : value : 2
    11-30 10:03:17.938 16586-16586/com.rxjava2.android.samples D/SimpleExampleActivity:  onNext : value : 3
    11-30 10:03:17.944 16586-16586/com.rxjava2.android.samples D/SimpleExampleActivity:  onNext : value : 4
    11-30 10:03:17.950 16586-16586/com.rxjava2.android.samples D/SimpleExampleActivity:  onNext : value : 5
    11-30 10:03:17.955 16586-16586/com.rxjava2.android.samples D/SimpleExampleActivity:  onNext : value : 6
    11-30 10:03:17.961 16586-16586/com.rxjava2.android.samples D/SimpleExampleActivity:  onComplete

  • 2、通过map运算符 处理网咯请求的Demo,就比如说我去网络上请求个ApiUser回来，然后转化成我想要的User类

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private void doSomeWork() {
      getObservable()
              // Run on a background thread
              .subscribeOn(Schedulers.io())
              // Be notified on the main thread
              .observeOn(AndroidSchedulers.mainThread())
              .map(new Function<List<ApiUser>, List<User>>() {
                   //通过前面的东西，如何获取后面的东西
                  @Override
                  public List<User> apply(List<ApiUser> apiUsers) {
                      return Utils.convertApiUserListToUserList(apiUsers);
                  }
              })
              .subscribe(getObserver());
  }

  private Observable<List<ApiUser>> getObservable() {
      return Observable.create(new ObservableOnSubscribe<List<ApiUser>>() {
          @Override
          public void subscribe(ObservableEmitter<List<ApiUser>> e) {
              if (!e.isDisposed()) {
                  // List<ApiUser> 得到这个 对象
                  e.onNext(Utils.getApiUserList());
                  e.onComplete();
              }
          }
      });
  }

  • 处理得到的List<User>

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    //处理得到的 List<User>
      private Observer<List<User>> getObserver() {
          return new Observer<List<User>>() {

              @Override
              public void onSubscribe(Disposable d) {
                  Log.d(TAG, " onSubscribe : " + d.isDisposed());
              }

              @Override
              public void onNext(List<User> userList) {
                  Log.d(TAG, " onNext : " + userList.size());
              }

              @Override
              public void onError(Throwable e) {
                  Log.d(TAG, " onError : " + e.getMessage());
              }

              @Override
              public void onComplete() {
                  Log.d(TAG, " onComplete");
              }
          };

  • 输出结果

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11-30 10:22:26.566 16586-16586/com.rxjava2.android.samples D/MapExampleActivity:  onSubscribe : false
11-30 10:22:26.619 16586-16586/com.rxjava2.android.samples D/MapExampleActivity:  onNext : 3
11-30 10:22:26.624 16586-16586/com.rxjava2.android.samples D/MapExampleActivity:  onComplete
  • 3、两个复杂的操作放到子线程中去，然后在主线程中去处理 两队球迷的问题 zip

  • 获取数据源

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    private Observable<List<User>> getCricketFansObservable() {
          return Observable.create(new ObservableOnSubscribe<List<User>>() {
              @Override
              public void subscribe(ObservableEmitter<List<User>> e) {
                  if (!e.isDisposed()) {
                      e.onNext(Utils.getUserListWhoLovesCricket());
                      e.onComplete();
                  }
              }
          });
      }

      private Observable<List<User>> getFootballFansObservable() {
          return Observable.create(new ObservableOnSubscribe<List<User>>() {
              @Override
              public void subscribe(ObservableEmitter<List<User>> e) {
                  if (!e.isDisposed()) {
                      e.onNext(Utils.getUserListWhoLovesFootball());
                      e.onComplete();
                  }
              }
          });
      }

  • 处理

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    private void doSomeWork() {
          // 获取喜欢足球名单的人员   获取板球球迷的名单
          Observable.zip(getCricketFansObservable(), getFootballFansObservable(),
                  // 有点kotlin的啊 第一个对应的是沙面位置的第一个，最后是期望
                  new BiFunction<List<User>, List<User>, List<User>>() {
                      @Override
                      public List<User> apply(List<User> cricketFans, List<User> footballFans) {
                          return Utils.filterUserWhoLovesBoth(cricketFans, footballFans);
                      }
                  })
                  // Run on a background thread
                  .subscribeOn(Schedulers.io())
                  // Be notified on the main thread
                  .observeOn(AndroidSchedulers.mainThread())
                  .subscribe(getObserver());
      }

  • 结果监听

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    private Observer<List<User>> getObserver() {
          return new Observer<List<User>>() {

              @Override
              public void onSubscribe(Disposable d) {
                  Log.d(TAG, " onSubscribe : " + d.isDisposed());
              }

              @Override
              public void onNext(List<User> userList) {
                  textView.append(" onNext");
                  textView.append(AppConstant.LINE_SEPARATOR);
                  for (User user : userList) {
                      textView.append(" firstname : " + user.firstname);
                      textView.append(AppConstant.LINE_SEPARATOR);
                  }
                  Log.d(TAG, " onNext : " + userList.size());
              }

              @Override
              public void onError(Throwable e) {
                  textView.append(" onError : " + e.getMessage());
                  textView.append(AppConstant.LINE_SEPARATOR);
                  Log.d(TAG, " onError : " + e.getMessage());
              }

              @Override
              public void onComplete() {
                  textView.append(" onComplete");
                  textView.append(AppConstant.LINE_SEPARATOR);
                  Log.d(TAG, " onComplete");
              }
          };

  • 输出，过程就是找出两个类的共性，然后放到主线程操作它的结果

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    11-30 10:28:16.326 16586-16586/com.rxjava2.android.samples D/ZipExampleActivity:  onSubscribe : false
    11-30 10:28:16.353 16586-16586/com.rxjava2.android.samples D/ZipExampleActivity:  onNext : 1
    11-30 10:28:16.358 16586-16586/com.rxjava2.android.samples D/ZipExampleActivity:  onComplete

  • 4、对一些耗时操作的问题，可以使用使用容器 Disposable ,在活动被破坏后不要发送事件

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  //一次性容器，可以容纳多个其他一次性物品，并提供O(1)添加和移除复杂性。
  private final CompositeDisposable disposables = new CompositeDisposable();
@Override
  protected void onDestroy() {
      super.onDestroy();
      //在活动被破坏后不要发送事件
      disposables.clear(); // do not send event after activity has been destroyed
  }
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disposables.add(sampleObservable()
               // Run on a background thread
               .subscribeOn(Schedulers.io())
               // Be notified on the main thread
               .observeOn(AndroidSchedulers.mainThread())
               .subscribeWith(new DisposableObserver<String>() {
                   @Override
                   public void onComplete() {
                       textView.append(" onComplete");
                       textView.append(AppConstant.LINE_SEPARATOR);
                       Log.d(TAG, " onComplete");
                   }

                   @Override
                   public void onError(Throwable e) {
                       textView.append(" onError : " + e.getMessage());
                       textView.append(AppConstant.LINE_SEPARATOR);
                       Log.d(TAG, " onError : " + e.getMessage());
                   }

                   @Override
                   public void onNext(String value) {
                       textView.append(" onNext : value : " + value);
                       textView.append(AppConstant.LINE_SEPARATOR);
                       Log.d(TAG, " onNext value : " + value);
                   }
               }));

  • sampleObservable 

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    static Observable<String> sampleObservable() {
           return Observable.defer(new Callable<ObservableSource<? extends String>>() {
               @Override
               public ObservableSource<? extends String> call() {
                   // Do some long running operation
                   // 做一些长时间运行的操作
                   SystemClock.sleep(2000);
                   return Observable.just("one", "two", "three", "four", "five");
               }
           });
       }

  • 输出结果

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    11-30 10:32:47.735 16586-16586/com.rxjava2.android.samples D/DisposableExampleActivity:  onNext value : one
    11-30 10:32:47.748 16586-16586/com.rxjava2.android.samples D/DisposableExampleActivity:  onNext value : two
    11-30 10:32:47.755 16586-16586/com.rxjava2.android.samples D/DisposableExampleActivity:  onNext value : three
    11-30 10:32:47.762 16586-16586/com.rxjava2.android.samples D/DisposableExampleActivity:  onNext value : four
    11-30 10:32:47.770 16586-16586/com.rxjava2.android.samples D/DisposableExampleActivity:  onNext value : five
    11-30 10:32:47.775 16586-16586/com.rxjava2.android.samples D/DisposableExampleActivity:  onComplete

  • 5、使用取算符，它只发出所需数量的值。这里只有5个中的3个

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    private void doSomeWork() {
        getObservable()
                // Run on a background thread
                .subscribeOn(Schedulers.io())
                // Be notified on the main thread
                .observeOn(AndroidSchedulers.mainThread())
                .take(3)
                .subscribe(getObserver());
    }

    private Observable<Integer> getObservable() {
        return Observable.just(1, 2, 3, 4, 5);
    }

  • 监听 

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    private Observer<Integer> getObserver() {
           return new Observer<Integer>() {

               @Override
               public void onSubscribe(Disposable d) {
                   Log.d(TAG, " onSubscribe : " + d.isDisposed());
               }

               @Override
               public void onNext(Integer value) {
                   textView.append(" onNext : value : " + value);
                   textView.append(AppConstant.LINE_SEPARATOR);
                   Log.d(TAG, " onNext value : " + value);
               }

               @Override
               public void onError(Throwable e) {
                   textView.append(" onError : " + e.getMessage());
                   textView.append(AppConstant.LINE_SEPARATOR);
                   Log.d(TAG, " onError : " + e.getMessage());
               }

               @Override
               public void onComplete() {
                   textView.append(" onComplete");
                   textView.append(AppConstant.LINE_SEPARATOR);
                   Log.d(TAG, " onComplete");
               }
           };
       }

  • 输出结果

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    11-30 10:33:43.235 16586-16586/com.rxjava2.android.samples D/TakeExampleActivity:  onSubscribe : false
    11-30 10:33:43.254 16586-16586/com.rxjava2.android.samples D/TakeExampleActivity:  onNext value : 1
    11-30 10:33:43.259 16586-16586/com.rxjava2.android.samples D/TakeExampleActivity:  onNext value : 2
    11-30 10:33:43.265 16586-16586/com.rxjava2.android.samples D/TakeExampleActivity:  onNext value : 3
    11-30 10:33:43.271 16586-16586/com.rxjava2.android.samples D/TakeExampleActivity:  onComplete

  • 6、延迟两秒运行

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    private void doSomeWork() {
        getObservable()
                // Run on a background thread
                .subscribeOn(Schedulers.io())
                // Be notified on the main thread
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(getObserver());
    }

    private Observable<? extends Long> getObservable() {
        return Observable.timer(2, TimeUnit.SECONDS);
    }

  • 7、定时器 不断重复的运行 使用RxJava运行 使用间隔2秒的间隔运行任务的简单示例

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    private final CompositeDisposable disposables = new CompositeDisposable();
    @Override
       protected void onDestroy() {
           super.onDestroy();
           disposables.clear(); // clearing it : do not emit after destroy
       }

  • 使用间隔2秒的间隔运行任务的简单示例立即开始，initialDelay的开始的时间为0

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    private void doSomeWork() {
         disposables.add(getObservable()
                 // Run on a background thread
                 .subscribeOn(Schedulers.io())
                 // Be notified on the main thread
                 .observeOn(AndroidSchedulers.mainThread())
                 .subscribeWith(getObserver()));
     }

     private Observable<? extends Long> getObservable() {
         return Observable.interval(0, 2, TimeUnit.SECONDS);
     }

  • 8、使用单观察者的简单例子

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    /*
        * simple example using SingleObserver
        *使用单观察者的简单例子
        */
       private void doSomeWork() {
           Single.just("Amit")
                   .subscribe(getSingleObserver());
       }

  • 观察者

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    private SingleObserver<String> getSingleObserver() {
           return new SingleObserver<String>() {
               @Override
               public void onSubscribe(Disposable d) {
                   Log.d(TAG, " onSubscribe : " + d.isDisposed());
               }

               @Override
               public void onSuccess(String value) {
                   textView.append(" onNext : value : " + value);
                   textView.append(AppConstant.LINE_SEPARATOR);
                   Log.d(TAG, " onNext value : " + value);
               }

               @Override
               public void onError(Throwable e) {
                   textView.append(" onError : " + e.getMessage());
                   textView.append(AppConstant.LINE_SEPARATOR);
                   Log.d(TAG, " onError : " + e.getMessage());
               }
           };
       }

  • 输出结果 ：注意这里没有onNext的方法了，这个比较特殊

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    11-30 11:11:00.612 16586-16586/com.rxjava2.android.samples D/SingleObserverExampleActivity:  onSubscribe : true
    11-30 11:11:00.615 16586-16586/com.rxjava2.android.samples D/SingleObserverExampleActivity:  onNext value : Amit

  • 9、使用完全观测器的简单示例，延迟1s才去自行

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     Completable completable = Completable.timer(1000, TimeUnit.MILLISECONDS);

           completable
                   .subscribeOn(Schedulers.io())
                   // Be notified on the main thread
                   .observeOn(AndroidSchedulers.mainThread())
                   .subscribe(getCompletableObserver());

    private CompletableObserver getCompletableObserver() {
           return new CompletableObserver() {
               @Override
               public void onSubscribe(Disposable d) {
                   Log.d(TAG, " onSubscribe : " + d.isDisposed());
               }

               @Override
               public void onComplete() {
                   textView.append(" onComplete");
                   textView.append(AppConstant.LINE_SEPARATOR);
                   Log.d(TAG, " onComplete");
               }

               @Override
               public void onError(Throwable e) {
                   textView.append(" onError : " + e.getMessage());
                   textView.append(AppConstant.LINE_SEPARATOR);
                   Log.d(TAG, " onError : " + e.getMessage());
               }
           };
       }

  • 输出结果 ：延迟1s

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    11-30 11:12:41.248 16586-16586/com.rxjava2.android.samples D/CompletableObserverExampleActivity:  onSubscribe : false
    11-30 11:12:42.270 16586-16586/com.rxjava2.android.samples D/CompletableObserverExampleActivity:  onComplete

  • 10、使用流动性的简单示例，说白了 就是累加的过程 1+2+3+4+5 ==== 使用Rxjava管理 这个带了一个初始值

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       Flowable<Integer> observable = Flowable.just(100, 2, 3, 4);

           observable.reduce(50+1, new BiFunction<Integer, Integer, Integer>() {
               @Override
               public Integer apply(Integer t1, Integer t2) {
                   Log.d(TAG, "  t1 : " + t1);
                   Log.d(TAG, "  t2 : " + t2);
                   return t1 + t2;
               }
           }).subscribe(getObserver());

    private SingleObserver<Integer> getObserver() {

           return new SingleObserver<Integer>() {
               @Override
               public void onSubscribe(Disposable d) {
                   Log.d(TAG, " onSubscribe : " + d.isDisposed());
               }

               @Override
               public void onSuccess(Integer value) {
                   textView.append(" onSuccess : value : " + value);
                   textView.append(AppConstant.LINE_SEPARATOR);
                   Log.d(TAG, " onSuccess : value : " + value);
               }

               @Override
               public void onError(Throwable e) {
                   textView.append(" onError : " + e.getMessage());
                   textView.append(AppConstant.LINE_SEPARATOR);
                   Log.d(TAG, " onError : " + e.getMessage());
               }
           };
       }

  • 输出结果：51+100+2+3+4=160

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    11-30 11:14:40.489 16586-16586/com.rxjava2.android.samples D/FlowableExampleActivity:  onSubscribe : false
    11-30 11:14:40.490 16586-16586/com.rxjava2.android.samples D/FlowableExampleActivity:   t1 : 51
          t2 : 100
          t1 : 151
          t2 : 2
          t1 : 153
          t2 : 3
          t1 : 156
    11-30 11:14:40.491 16586-16586/com.rxjava2.android.samples D/FlowableExampleActivity:   t2 : 4
    11-30 11:14:40.496 16586-16586/com.rxjava2.android.samples D/FlowableExampleActivity:  onSuccess : value : 160

  • 11、说白了 就是累加的过程 1+2+3+4+5 ==== 使用Rxjava管理 这个没有带一个初始值

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    /*
       * simple example using reduce to add all the number
       *
       * 简单的例子，用以减少所有数字的添加
       */
      private void doSomeWork() {
          getObservable()
                  .reduce(new BiFunction<Integer, Integer, Integer>() {
                      @Override
                      public Integer apply(Integer t1, Integer t2) {
                          return t1 + t2;
                      }
                  })
                  .subscribe(getObserver());
      }

      private Observable<Integer> getObservable() {
          return Observable.just(1, 2, 3, 4);
      }

      private MaybeObserver<Integer> getObserver() {
          return new MaybeObserver<Integer>() {
              @Override
              public void onSubscribe(Disposable d) {
                  Log.d(TAG, " onSubscribe : " + d.isDisposed());
              }

              @Override
              public void onSuccess(Integer value) {
                  textView.append(" onSuccess : value : " + value);
                  textView.append(AppConstant.LINE_SEPARATOR);
                  Log.d(TAG, " onSuccess : value : " + value);
              }

              @Override
              public void onError(Throwable e) {
                  textView.append(" onError : " + e.getMessage());
                  textView.append(AppConstant.LINE_SEPARATOR);
                  Log.d(TAG, " onError : " + e.getMessage());
              }

              @Override
              public void onComplete() {
                  textView.append(" onComplete");
                  textView.append(AppConstant.LINE_SEPARATOR);
                  Log.d(TAG, " onComplete");
              }
          };
      }

  • 输出结果

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    11-30 11:16:17.035 16586-16586/com.rxjava2.android.samples D/ReduceExampleActivity:  onSubscribe : false
    11-30 11:16:17.039 16586-16586/com.rxjava2.android.samples D/ReduceExampleActivity:  onSuccess : value : 10

  • 12 、一个buffer 缓冲取 ，我要从缓冲区中取数据，而且是跳着取数据，就要这样做

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    /*
      * simple example using buffer operator - bundles all emitted values into a list
      *
      * 使用缓冲运算符的简单示例-将所有发出的值捆绑到列表中
      */
     private void doSomeWork() {

         Observable<List<String>> buffered = getObservable().buffer(3, 1);

         // 3 means,  从开始索引和创建列表中最多需要三个
         // 1 means, 每次跳一步
         // so the it gives the following list
         // 1 - one, two, three
         // 2 - two, three, four
         // 3 - three, four, five
         // 4 - four, five
         // 5 - five

         buffered.subscribe(getObserver());
     }

     private Observable<String> getObservable() {
         return Observable.just("one", "two", "three", "four", "five");
     }

     private Observer<List<String>> getObserver() {
         return new Observer<List<String>>() {

             @Override
             public void onSubscribe(Disposable d) {
                 Log.d(TAG, " onSubscribe : " + d.isDisposed());
             }

             @Override
             public void onNext(List<String> stringList) {
                 textView.append(" onNext size : " + stringList.size());
                 textView.append(AppConstant.LINE_SEPARATOR);
                 Log.d(TAG, " onNext : size :" + stringList.size());
                 for (String value : stringList) {
                     textView.append(" value : " + value);
                     textView.append(AppConstant.LINE_SEPARATOR);
                     Log.d(TAG, " : value :" + value);
                 }

             }

             @Override
             public void onError(Throwable e) {
                 textView.append(" onError : " + e.getMessage());
                 textView.append(AppConstant.LINE_SEPARATOR);
                 Log.d(TAG, " onError : " + e.getMessage());
             }

             @Override
             public void onComplete() {
                 textView.append(" onComplete");
                 textView.append(AppConstant.LINE_SEPARATOR);
                 Log.d(TAG, " onComplete");
             }
         };
     }

  • 输出结果：以此取出3个数字，同时角标移动1.把这个buffer中的值去完成就ok

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    11-30 11:17:25.002 16586-16586/com.rxjava2.android.samples D/BufferExampleActivity:  onSubscribe : false
    11-30 11:17:25.009 16586-16586/com.rxjava2.android.samples D/BufferExampleActivity:  onNext : size :3
    11-30 11:17:25.012 16586-16586/com.rxjava2.android.samples D/BufferExampleActivity:  : value :one
    11-30 11:17:25.014 16586-16586/com.rxjava2.android.samples D/BufferExampleActivity:  : value :two
    11-30 11:17:25.016 16586-16586/com.rxjava2.android.samples D/BufferExampleActivity:  : value :three
    11-30 11:17:25.018 16586-16586/com.rxjava2.android.samples D/BufferExampleActivity:  onNext : size :3
    11-30 11:17:25.019 16586-16586/com.rxjava2.android.samples D/BufferExampleActivity:  : value :two
    11-30 11:17:25.021 16586-16586/com.rxjava2.android.samples D/BufferExampleActivity:  : value :three
    11-30 11:17:25.022 16586-16586/com.rxjava2.android.samples D/BufferExampleActivity:  : value :four
    11-30 11:17:25.025 16586-16586/com.rxjava2.android.samples D/BufferExampleActivity:  onNext : size :3
    11-30 11:17:25.027 16586-16586/com.rxjava2.android.samples D/BufferExampleActivity:  : value :three
    11-30 11:17:25.029 16586-16586/com.rxjava2.android.samples D/BufferExampleActivity:  : value :four
    11-30 11:17:25.031 16586-16586/com.rxjava2.android.samples D/BufferExampleActivity:  : value :five
    11-30 11:17:25.033 16586-16586/com.rxjava2.android.samples D/BufferExampleActivity:  onNext : size :2
    11-30 11:17:25.035 16586-16586/com.rxjava2.android.samples D/BufferExampleActivity:  : value :four
    11-30 11:17:25.037 16586-16586/com.rxjava2.android.samples D/BufferExampleActivity:  : value :five
    11-30 11:17:25.039 16586-16586/com.rxjava2.android.samples D/BufferExampleActivity:  onNext : size :1
    11-30 11:17:25.040 16586-16586/com.rxjava2.android.samples D/BufferExampleActivity:  : value :five
    11-30 11:17:25.041 16586-16586/com.rxjava2.android.samples D/BufferExampleActivity:  onComplete

  • 13、 对数据中特定的信息 做处理 使用过滤器操作符只发出偶数值的简单示例

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    /*
       * simple example by using filter operator to emit only even value
       * 使用过滤器操作符只发出偶数值的简单示例
       */
      private void doSomeWork() {
          Observable.just(1, 2, 3, 4, 5, 6)
                  .filter(new Predicate<Integer>() {
                      @Override
                      public boolean test(Integer integer) {
                          return integer % 2 == 0;
                      }
                  })
                  .subscribe(getObserver());
      }


      private Observer<Integer> getObserver() {
          return new Observer<Integer>() {

              @Override
              public void onSubscribe(Disposable d) {
                  Log.d(TAG, " onSubscribe : " + d.isDisposed());
              }

              @Override
              public void onNext(Integer value) {
                  textView.append(" onNext : ");
                  textView.append(AppConstant.LINE_SEPARATOR);
                  textView.append(" value : " + value);
                  textView.append(AppConstant.LINE_SEPARATOR);
                  Log.d(TAG, " onNext ");
                  Log.d(TAG, " value : " + value);
              }

              @Override
              public void onError(Throwable e) {
                  textView.append(" onError : " + e.getMessage());
                  textView.append(AppConstant.LINE_SEPARATOR);
                  Log.d(TAG, " onError : " + e.getMessage());
              }

              @Override
              public void onComplete() {
                  textView.append(" onComplete");
                  textView.append(AppConstant.LINE_SEPARATOR);
                  Log.d(TAG, " onComplete");
              }
          };
      }

  • 输出结果，简单的意思 就是取偶数

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    11-30 11:20:24.775 16586-16586/com.rxjava2.android.samples D/FilterExampleActivity:  onSubscribe : false
    11-30 11:20:24.779 16586-16586/com.rxjava2.android.samples D/FilterExampleActivity:  onNext 
    11-30 11:20:24.780 16586-16586/com.rxjava2.android.samples D/FilterExampleActivity:  value : 2
    11-30 11:20:24.782 16586-16586/com.rxjava2.android.samples D/FilterExampleActivity:  onNext 
         value : 4
    11-30 11:20:24.786 16586-16586/com.rxjava2.android.samples D/FilterExampleActivity:  onNext 
         value : 6
    11-30 11:20:24.788 16586-16586/com.rxjava2.android.samples D/FilterExampleActivity:  onComplete

  • 14、使用跳过操作符，它不会发出前2个值。 对前面两个值不会操作

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    /* Using skip operator, it will not emit
       * the first 2 values.
       * 使用跳过操作符，它不会发出前2个值。
       */
       private void doSomeWork() {
           getObservable()
                   // Run on a background thread
                   .subscribeOn(Schedulers.io())
                   // Be notified on the main thread
                   .observeOn(AndroidSchedulers.mainThread())
                   .skip(2)
                   .subscribe(getObserver());
       }

       private Observable<Integer> getObservable() {
           return Observable.just(1, 2, 3, 4, 5);
       }

       private Observer<Integer> getObserver() {
           return new Observer<Integer>() {

               @Override
               public void onSubscribe(Disposable d) {
                   Log.d(TAG, " onSubscribe : " + d.isDisposed());
               }

               @Override
               public void onNext(Integer value) {
                   textView.append(" onNext : value : " + value);
                   textView.append(AppConstant.LINE_SEPARATOR);
                   Log.d(TAG, " onNext value : " + value);
               }

               @Override
               public void onError(Throwable e) {
                   textView.append(" onError : " + e.getMessage());
                   textView.append(AppConstant.LINE_SEPARATOR);
                   Log.d(TAG, " onError : " + e.getMessage());
               }

               @Override
               public void onComplete() {
                   textView.append(" onComplete");
                   textView.append(AppConstant.LINE_SEPARATOR);
                   Log.d(TAG, " onComplete");
               }
           };
       }

  • 输出结果：跳出前面的两个值

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    11-30 11:21:22.224 16586-16586/com.rxjava2.android.samples D/SkipExampleActivity:  onSubscribe : false
    11-30 11:21:22.235 16586-16586/com.rxjava2.android.samples D/SkipExampleActivity:  onNext value : 3
    11-30 11:21:22.236 16586-16586/com.rxjava2.android.samples D/SkipExampleActivity:  onNext value : 4
         onNext value : 5
    11-30 11:21:22.237 16586-16586/com.rxjava2.android.samples D/SkipExampleActivity:  onComplete

  • 15、 使用扫描算子，它也发送先前的结果。 意思就是 我关心每次运算的结果 ，是每次运算的结果 这个有个关键的地方 subscribe 里面的 观察者 onNext的方法是先行执行的

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    /* Using scan operator, it sends also the previous result
      * 使用扫描算子，它也发送先前的结果。
      * */
      private void doSomeWork() {
          getObservable()
                  // Run on a background thread
                  .subscribeOn(Schedulers.io())
                  // Be notified on the main thread
                  .observeOn(AndroidSchedulers.mainThread())
                  .scan(new BiFunction<Integer, Integer, Integer>() {
                      @Override
                      public Integer apply(Integer int1, Integer int2) {
                          Log.d(TAG, "  int1 : " + int1);
                          Log.d(TAG, "  int2 : " + int2);
                          return int1 + int2;
                      }
                  })
                  .subscribe(getObserver());
      }

      private Observable<Integer> getObservable() {
          return Observable.just(1, 2, 3, 4, 5);
      }

      private Observer<Integer> getObserver() {
          return new Observer<Integer>() {

              @Override
              public void onSubscribe(Disposable d) {
                  Log.d(TAG, " onSubscribe : " + d.isDisposed());
              }

              @Override
              public void onNext(Integer value) {
                  textView.append(" onNext : value : " + value);
                  textView.append(AppConstant.LINE_SEPARATOR);
                  Log.d(TAG, " onNext value : " + value);
              }

              @Override
              public void onError(Throwable e) {
                  textView.append(" onError : " + e.getMessage());
                  textView.append(AppConstant.LINE_SEPARATOR);
                  Log.d(TAG, " onError : " + e.getMessage());
              }

              @Override
              public void onComplete() {
                  textView.append(" onComplete");
                  textView.append(AppConstant.LINE_SEPARATOR);
                  Log.d(TAG, " onComplete");
              }
          };
      }

  • 输出结果：三角形数

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    11-30 11:22:24.396 16586-16586/com.rxjava2.android.samples D/ScanExampleActivity:  onSubscribe : false
    11-30 11:22:24.409 16586-16586/com.rxjava2.android.samples D/ScanExampleActivity:  onNext value : 1
          int1 : 1
          int2 : 2
    11-30 11:22:24.411 16586-16586/com.rxjava2.android.samples D/ScanExampleActivity:  onNext value : 3
          int1 : 3
          int2 : 3
    11-30 11:22:24.414 16586-16586/com.rxjava2.android.samples D/ScanExampleActivity:  onNext value : 6
          int1 : 6
          int2 : 4
    11-30 11:22:24.417 16586-16586/com.rxjava2.android.samples D/ScanExampleActivity:  onNext value : 10
          int1 : 10
          int2 : 5
    11-30 11:22:24.419 16586-16586/com.rxjava2.android.samples D/ScanExampleActivity:  onNext value : 15
    11-30 11:22:24.420 16586-16586/com.rxjava2.android.samples D/ScanExampleActivity:  onComplete

  • 16、PublishSubject 我个人理解的话，就是一堆数据我要发送给别人，但是呢最后几个数字我又要发送给其他人，所以就需要使用到这个，使用重放操作符，重放确保所有观察者看到相同的序列。发射项目，即使它们订阅后，可观测已经开始发射项目。我个人理解的是，发送一个buffer，给第一个观察者，同时我要把这个buffer的尾部长度为4的在发送给第二个观察者。

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private void doSomeWork() {
       PublishSubject<Integer> source = PublishSubject.create();
       ConnectableObservable<Integer> connectableObservable = source.replay(4); 
        //连接可连接的可观察的
       connectableObservable.connect();
       connectableObservable.subscribe(getFirstObserver());
       source.onNext(1);
       source.onNext(2);
       source.onNext(3);
       source.onNext(4);
       source.onNext(5);
       source.onNext(6);
       source.onNext(7);
       source.onComplete();
       connectableObservable.subscribe(getSecondObserver());
   }


   private Observer<Integer> getFirstObserver() {
       return new Observer<Integer>() {

           @Override
           public void onSubscribe(Disposable d) {
               Log.d(TAG, " First onSubscribe : " + d.isDisposed());
           }

           @Override
           public void onNext(Integer value) {
               textView.append(" First onNext : value : " + value);
               textView.append(AppConstant.LINE_SEPARATOR);
               Log.d(TAG, " First onNext value : " + value);
           }

           @Override
           public void onError(Throwable e) {
               textView.append(" First onError : " + e.getMessage());
               textView.append(AppConstant.LINE_SEPARATOR);
               Log.d(TAG, " First onError : " + e.getMessage());
           }

           @Override
           public void onComplete() {
               textView.append(" First onComplete");
               textView.append(AppConstant.LINE_SEPARATOR);
               Log.d(TAG, " First onComplete");
           }
       };
   }

   private Observer<Integer> getSecondObserver() {
       return new Observer<Integer>() {

           @Override
           public void onSubscribe(Disposable d) {
               textView.append(" Second onSubscribe : isDisposed :" + d.isDisposed());
               Log.d(TAG, " Second onSubscribe : " + d.isDisposed());
               textView.append(AppConstant.LINE_SEPARATOR);
           }

           @Override
           public void onNext(Integer value) {
               textView.append(" Second onNext : value : " + value);
               textView.append(AppConstant.LINE_SEPARATOR);
               Log.d(TAG, " Second onNext value : " + value);
           }

           @Override
           public void onError(Throwable e) {
               textView.append(" Second onError : " + e.getMessage());
               Log.d(TAG, " Second onError : " + e.getMessage());
           }

           @Override
           public void onComplete() {
               textView.append(" Second onComplete");
               Log.d(TAG, " Second onComplete");
           }
       };
   }

  • 输出结果

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    11-30 11:39:02.882 19690-19690/com.rxjava2.android.samples D/ReplayExampleActivity:  First onSubscribe : false
    11-30 11:39:02.903 19690-19690/com.rxjava2.android.samples D/ReplayExampleActivity:  First onNext value : 1
    11-30 11:39:02.911 19690-19690/com.rxjava2.android.samples D/ReplayExampleActivity:  First onNext value : 2
    11-30 11:39:02.919 19690-19690/com.rxjava2.android.samples D/ReplayExampleActivity:  First onNext value : 3
    11-30 11:39:02.926 19690-19690/com.rxjava2.android.samples D/ReplayExampleActivity:  First onNext value : 4
    11-30 11:39:02.932 19690-19690/com.rxjava2.android.samples D/ReplayExampleActivity:  First onNext value : 5
    11-30 11:39:02.938 19690-19690/com.rxjava2.android.samples D/ReplayExampleActivity:  First onNext value : 6
    11-30 11:39:02.944 19690-19690/com.rxjava2.android.samples D/ReplayExampleActivity:  First onNext value : 7
    11-30 11:39:02.950 19690-19690/com.rxjava2.android.samples D/ReplayExampleActivity:  First onComplete
    11-30 11:39:02.954 19690-19690/com.rxjava2.android.samples D/ReplayExampleActivity:  Second onSubscribe : false
    11-30 11:39:02.963 19690-19690/com.rxjava2.android.samples D/ReplayExampleActivity:  Second onNext value : 4
    11-30 11:39:02.968 19690-19690/com.rxjava2.android.samples D/ReplayExampleActivity:  Second onNext value : 5
    11-30 11:39:02.972 19690-19690/com.rxjava2.android.samples D/ReplayExampleActivity:  Second onNext value : 6
    11-30 11:39:02.977 19690-19690/com.rxjava2.android.samples D/ReplayExampleActivity:  Second onNext value : 7
    11-30 11:39:02.979 19690-19690/com.rxjava2.android.samples D/ReplayExampleActivity:  Second onComplete

  • 17 、依次的发送两个数组，而且里面两个数组的是有序的输出的，所以就要使用到这个里面的

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    /**
        * 使用CONTAT运算符组合可观察性：CONTAT维护
        * 可观察的顺序。
        * 将按顺序发射所有7个值
        * 这里第一个“A1”，“A2”，“A3”，“A4”，然后是“B1”，“B2”，“B3”。
        * 首先从第一个观察到然后
        * 所有从第二可观察到的所有顺序
        */
       private void doSomeWork() {
           final String[] aStrings = {"A1", "A2", "A3", "A4"};
           final String[] bStrings = {"B1", "B2", "B3"};

           final Observable<String> aObservable = Observable.fromArray(aStrings);
           final Observable<String> bObservable = Observable.fromArray(bStrings);

           Observable.concat(aObservable, bObservable)
                   .subscribe(getObserver());
       }


       private Observer<String> getObserver() {
           return new Observer<String>() {

               @Override
               public void onSubscribe(Disposable d) {
                   Log.d(TAG, " onSubscribe : " + d.isDisposed());
               }

               @Override
               public void onNext(String value) {
                   textView.append(" onNext : value : " + value);
                   textView.append(AppConstant.LINE_SEPARATOR);
                   Log.d(TAG, " onNext : value : " + value);
               }

               @Override
               public void onError(Throwable e) {
                   textView.append(" onError : " + e.getMessage());
                   textView.append(AppConstant.LINE_SEPARATOR);
                   Log.d(TAG, " onError : " + e.getMessage());
               }

               @Override
               public void onComplete() {
                   textView.append(" onComplete");
                   textView.append(AppConstant.LINE_SEPARATOR);
                   Log.d(TAG, " onComplete");
               }
           };
       }

  • 输出结果

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    11-30 11:42:43.359 19690-19690/com.rxjava2.android.samples D/ConcatExampleActivity:  onSubscribe : false
    11-30 11:42:43.369 19690-19690/com.rxjava2.android.samples D/ConcatExampleActivity:  onNext : value : A1
    11-30 11:42:43.375 19690-19690/com.rxjava2.android.samples D/ConcatExampleActivity:  onNext : value : A2
    11-30 11:42:43.382 19690-19690/com.rxjava2.android.samples D/ConcatExampleActivity:  onNext : value : A3
    11-30 11:42:43.388 19690-19690/com.rxjava2.android.samples D/ConcatExampleActivity:  onNext : value : A4
    11-30 11:42:43.393 19690-19690/com.rxjava2.android.samples D/ConcatExampleActivity:  onNext : value : B1
    11-30 11:42:43.399 19690-19690/com.rxjava2.android.samples D/ConcatExampleActivity:  onNext : value : B2
    11-30 11:42:43.404 19690-19690/com.rxjava2.android.samples D/ConcatExampleActivity:  onNext : value : B3
    11-30 11:42:43.409 19690-19690/com.rxjava2.android.samples D/ConcatExampleActivity:  onComplete

  • 18、依次的发送两个数组，而且里面两个数组的不是有序的输出的，但是我始终没有测出来结果，哎哎 难受的很 日了狗！ RxJava 合并组合两个（或多个）Observable数据源

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private void doSomeWork() {
      final String[] aStrings = {"A1", "A2", "A3", "A4","1", "2", "3", "4","5", "6", "7", "8","9", "10", "11", "12",};
      final String[] bStrings = {"B1", "B2", "B3","B1", "B2", "B3","B1", "B2", "B3","B1", "B2", "B3","B1", "B2", "B3","B1", "B2", "B3","B1", "B2", "B3"};

      final Observable<String> aObservable = Observable.fromArray(aStrings);
      final Observable<String> bObservable = Observable.fromArray(bStrings);

      Observable.merge(aObservable, bObservable)
              .subscribe(getObserver());
  }


  private Observer<String> getObserver() {
      return new Observer<String>() {

          @Override
          public void onSubscribe(Disposable d) {
              Log.d(TAG, " onSubscribe : " + d.isDisposed());
          }

          @Override
          public void onNext(String value) {
              textView.append(" onNext : value : " + value);
              textView.append(AppConstant.LINE_SEPARATOR);
              Log.d(TAG, " onNext : value : " + value);
          }

          @Override
          public void onError(Throwable e) {
              textView.append(" onError : " + e.getMessage());
              textView.append(AppConstant.LINE_SEPARATOR);
              Log.d(TAG, " onError : " + e.getMessage());
          }

          @Override
          public void onComplete() {
              textView.append(" onComplete");
              textView.append(AppConstant.LINE_SEPARATOR);
              Log.d(TAG, " onComplete");
          }
      };
  }

  • 输出结果：合并多个Observables的发射物， Merge 可能会让合并的Observables发射的数据交错（有一个类似的操作符 Concat 不会让数 据交错，它会按顺序一个接着一个发射多个Observables的发射物，虽然我的结果没有测试出来，但是呢？真的有可能数据会交叉！！！！

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    11-30 11:46:44.466 19690-19690/com.rxjava2.android.samples D/MergeExampleActivity:  onSubscribe : false
    11-30 11:46:44.477 19690-19690/com.rxjava2.android.samples D/MergeExampleActivity:  onNext : value : A1
    11-30 11:46:44.484 19690-19690/com.rxjava2.android.samples D/MergeExampleActivity:  onNext : value : A2
    11-30 11:46:44.490 19690-19690/com.rxjava2.android.samples D/MergeExampleActivity:  onNext : value : A3
    11-30 11:46:44.495 19690-19690/com.rxjava2.android.samples D/MergeExampleActivity:  onNext : value : A4
    11-30 11:46:44.499 19690-19690/com.rxjava2.android.samples D/MergeExampleActivity:  onNext : value : 1
    11-30 11:46:44.503 19690-19690/com.rxjava2.android.samples D/MergeExampleActivity:  onNext : value : 2
    11-30 11:46:44.508 19690-19690/com.rxjava2.android.samples D/MergeExampleActivity:  onNext : value : 3
    11-30 11:46:44.512 19690-19690/com.rxjava2.android.samples D/MergeExampleActivity:  onNext : value : 4
    11-30 11:46:44.515 19690-19690/com.rxjava2.android.samples D/MergeExampleActivity:  onNext : value : 5
    11-30 11:46:44.517 19690-19690/com.rxjava2.android.samples D/MergeExampleActivity:  onNext : value : 6
    11-30 11:46:44.519 19690-19690/com.rxjava2.android.samples D/MergeExampleActivity:  onNext : value : 7
    11-30 11:46:44.522 19690-19690/com.rxjava2.android.samples D/MergeExampleActivity:  onNext : value : 8
    11-30 11:46:44.525 19690-19690/com.rxjava2.android.samples D/MergeExampleActivity:  onNext : value : 9
    11-30 11:46:44.528 19690-19690/com.rxjava2.android.samples D/MergeExampleActivity:  onNext : value : 10
    11-30 11:46:44.532 19690-19690/com.rxjava2.android.samples D/MergeExampleActivity:  onNext : value : 11
    11-30 11:46:44.535 19690-19690/com.rxjava2.android.samples D/MergeExampleActivity:  onNext : value : 12
    11-30 11:46:44.537 19690-19690/com.rxjava2.android.samples D/MergeExampleActivity:  onNext : value : B1
    11-30 11:46:44.539 19690-19690/com.rxjava2.android.samples D/MergeExampleActivity:  onNext : value : B2
    11-30 11:46:44.540 19690-19690/com.rxjava2.android.samples D/MergeExampleActivity:  onNext : value : B3
    11-30 11:46:44.542 19690-19690/com.rxjava2.android.samples D/MergeExampleActivity:  onNext : value : B1
    11-30 11:46:44.543 19690-19690/com.rxjava2.android.samples D/MergeExampleActivity:  onNext : value : B2
    11-30 11:46:44.546 19690-19690/com.rxjava2.android.samples D/MergeExampleActivity:  onNext : value : B3
    11-30 11:46:44.548 19690-19690/com.rxjava2.android.samples D/MergeExampleActivity:  onNext : value : B1
    11-30 11:46:44.551 19690-19690/com.rxjava2.android.samples D/MergeExampleActivity:  onNext : value : B2
    11-30 11:46:44.553 19690-19690/com.rxjava2.android.samples D/MergeExampleActivity:  onNext : value : B3
    11-30 11:46:44.556 19690-19690/com.rxjava2.android.samples D/MergeExampleActivity:  onNext : value : B1
    11-30 11:46:44.559 19690-19690/com.rxjava2.android.samples D/MergeExampleActivity:  onNext : value : B2
    11-30 11:46:44.561 19690-19690/com.rxjava2.android.samples D/MergeExampleActivity:  onNext : value : B3
    11-30 11:46:44.564 19690-19690/com.rxjava2.android.samples D/MergeExampleActivity:  onNext : value : B1
    11-30 11:46:44.567 19690-19690/com.rxjava2.android.samples D/MergeExampleActivity:  onNext : value : B2
    11-30 11:46:44.570 19690-19690/com.rxjava2.android.samples D/MergeExampleActivity:  onNext : value : B3
    11-30 11:46:44.573 19690-19690/com.rxjava2.android.samples D/MergeExampleActivity:  onNext : value : B1
    11-30 11:46:44.575 19690-19690/com.rxjava2.android.samples D/MergeExampleActivity:  onNext : value : B2
    11-30 11:46:44.577 19690-19690/com.rxjava2.android.samples D/MergeExampleActivity:  onNext : value : B3
    11-30 11:46:44.578 19690-19690/com.rxjava2.android.samples D/MergeExampleActivity:  onNext : value : B1
    11-30 11:46:44.580 19690-19690/com.rxjava2.android.samples D/MergeExampleActivity:  onNext : value : B2
    11-30 11:46:44.581 19690-19690/com.rxjava2.android.samples D/MergeExampleActivity:  onNext : value : B3
    11-30 11:46:44.582 19690-19690/com.rxjava2.android.samples D/MergeExampleActivity:  onComplete

  • 19、让属性跟着数据bean传递下去
    Car 类

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    public class Car {

        private String brand;

        public void setBrand(String brand) {
            this.brand = brand;
        }

        public Observable<String> brandDeferObservable() {
            return Observable.defer(new Callable<ObservableSource<? extends String>>() {
                @Override
                public ObservableSource<? extends String> call() {
                    return Observable.just(brand);
                }
            });
        }
    }
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    /*
       * Defer used for Deferring Observable code until subscription in RxJava
       * 推迟在RxJava订阅可观察代码直到订阅
       */
      private void doSomeWork() {

          Car car = new Car();

          Observable<String> brandDeferObservable = car.brandDeferObservable();
          // 即使我们在创建了可观察的品牌之后设置了品牌，我们也会得到宝马的品牌。如果我们不使用延迟器，我们将没有作为品牌。
          car.setBrand("BMW");  // Even if we are setting the brand after creating Observable
          // we will get the brand as BMW.
          // If we had not used defer, we would have got null as the brand.

          brandDeferObservable
                  .subscribe(getObserver());
      }

      private Observer<String> getObserver() {
          return new Observer<String>() {

              @Override
              public void onSubscribe(Disposable d) {
                  Log.d(TAG, " onSubscribe : " + d.isDisposed());
              }

              @Override
              public void onNext(String value) {
                  textView.append(" onNext : value : " + value);
                  textView.append(AppConstant.LINE_SEPARATOR);
                  Log.d(TAG, " onNext : value : " + value);
              }

              @Override
              public void onError(Throwable e) {
                  textView.append(" onError : " + e.getMessage());
                  textView.append(AppConstant.LINE_SEPARATOR);
                  Log.d(TAG, " onError : " + e.getMessage());
              }

              @Override
              public void onComplete() {
                  textView.append(" onComplete");
                  textView.append(AppConstant.LINE_SEPARATOR);
                  Log.d(TAG, " onComplete");
              }
          };
      }

  • 输出结果

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    11-30 14:17:07.380 19690-19690/com.rxjava2.android.samples D/DeferExampleActivity:  onSubscribe : false
    11-30 14:17:07.388 19690-19690/com.rxjava2.android.samples D/DeferExampleActivity:  onNext : value : BMW
    11-30 14:17:07.392 19690-19690/com.rxjava2.android.samples D/DeferExampleActivity:  onComplete

  • 20、去重，对数据源，进行去重的操作

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/*
    * distinct() suppresses duplicate items emitted by the source Observable.
    * 区别（）抑制由可观察到的源发出的重复项。
    */
   private void doSomeWork() {

       getObservable()
               .distinct()
               .subscribe(getObserver());
   }

   private Observable<Integer> getObservable() {
       return Observable.just(1, 2, 1, 1, 2, 3, 4, 6, 4);
   }


   private Observer<Integer> getObserver() {
       return new Observer<Integer>() {

           @Override
           public void onSubscribe(Disposable d) {
               Log.d(TAG, " onSubscribe : " + d.isDisposed());
           }

           @Override
           public void onNext(Integer value) {
               textView.append(" onNext : value : " + value);
               textView.append(AppConstant.LINE_SEPARATOR);
               Log.d(TAG, " onNext value : " + value);
           }

           @Override
           public void onError(Throwable e) {
               Log.d(TAG, " onError : " + e.getMessage());
           }

           @Override
           public void onComplete() {
               Log.d(TAG, " onComplete");
           }
       };
   }

  • 输出的结果

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    11-30 14:20:04.382 19690-19690/com.rxjava2.android.samples D/DistinctExampleActivity:  onSubscribe : false
    11-30 14:20:04.388 19690-19690/com.rxjava2.android.samples D/DistinctExampleActivity:  onNext value : 1
    11-30 14:20:04.391 19690-19690/com.rxjava2.android.samples D/DistinctExampleActivity:  onNext value : 2
    11-30 14:20:04.394 19690-19690/com.rxjava2.android.samples D/DistinctExampleActivity:  onNext value : 3
    11-30 14:20:04.397 19690-19690/com.rxjava2.android.samples D/DistinctExampleActivity:  onNext value : 4
    11-30 14:20:04.400 19690-19690/com.rxjava2.android.samples D/DistinctExampleActivity:  onNext value : 6
         onComplete

  • 21、对数据源传递，但是只不过是取最后一个数，把前面的都不需要了，同时给了一个默认的值 A1

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    private void doSomeWork() {
            // the default item ("A1") to emit if the source ObservableSource is empty
            getObservable().last("A1") // the default item ("A1") to emit if the source ObservableSource is empty
                    .subscribe(getObserver());
        }

        private Observable<String> getObservable() {
            return Observable.just("A1", "A2", "A3", "A4", "A5", "A6");
        }

        private SingleObserver<String> getObserver() {
            return new SingleObserver<String>() {

                @Override
                public void onSubscribe(Disposable d) {
                    Log.d(TAG, " onSubscribe : " + d.isDisposed());
                }

                @Override
                public void onSuccess(String value) {
                    textView.append(" onNext : value : " + value);
                    textView.append(AppConstant.LINE_SEPARATOR);
                    Log.d(TAG, " onNext value : " + value);
                }


                @Override
                public void onError(Throwable e) {
                    textView.append(" onError : " + e.getMessage());
                    textView.append(AppConstant.LINE_SEPARATOR);
                    Log.d(TAG, " onError : " + e.getMessage());
                }
            };
        }

  • 输出结果

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    11-30 14:20:42.788 19690-19690/com.rxjava2.android.samples D/DistinctExampleActivity:  onSubscribe : false
    11-30 14:20:42.800 19690-19690/com.rxjava2.android.samples D/DistinctExampleActivity:  onNext value : A6

  • 未完待续。。。。。Rxjava2-Android-Samlpes（二）

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