RxJava2 / RxAndroid2操作符distinct与distinctUntilChanged去重结果异同

代码例如：

package zhangphil.app; import android.os.Bundle; import android.support.annotation.Nullable; import android.support.v7.app.AppCompatActivity; import android.util.Log; import io.reactivex.Observable; import io.reactivex.android.schedulers.AndroidSchedulers; import io.reactivex.disposables.CompositeDisposable; import io.reactivex.observers.DisposableObserver; import io.reactivex.schedulers.Schedulers; public class MainActivity extends AppCompatActivity { private final String TAG = getClass().getSimpleName(); private CompositeDisposable mCompositeDisposable = new CompositeDisposable(); private Integer[] test_data = { 1, 1, 2, 3, 4, 5, 2, 5, 3, 6, 4, 7, 7, 8, 9 }; // 故意设置若干重复的数据，等待去重复数据 @Override public void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); test(); } private void test() { Observable<Integer> observable1 = Observable.fromArray(test_data); Observable<Integer> observable2 = Observable.fromArray(test_data); mCompositeDisposable.addAll(observable1 .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .distinct() .subscribeWith(getObserver(0)), observable2 .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .distinctUntilChanged() .subscribeWith(getObserver(1))); } private DisposableObserver getObserver(final int id) { DisposableObserver disposableObserver = new DisposableObserver<Object>() { @Override public void onNext(Object o) { Log.d(id + TAG, "#####开始#####"); Log.d(id + "数据", String.valueOf(o)); Log.d(id + TAG, "#####结束#####"); } @Override public void onComplete() { Log.d(id + TAG, "onComplete"); } @Override public void onError(Throwable e) { Log.e(id + TAG, e.toString(), e); } }; return disposableObserver; } @Override protected void onDestroy() { super.onDestroy(); // 如果退出程序，就清除后台任务 mCompositeDisposable.clear(); } } 

运行结果输出：

05-18 10:57:55.069 4374-4374/zhangphil.app D/0MainActivity: #####开始##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/0数据: 1 05-18 10:57:55.070 4374-4374/zhangphil.app D/0MainActivity: #####结束##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/0MainActivity: #####开始##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/0数据: 2 05-18 10:57:55.070 4374-4374/zhangphil.app D/0MainActivity: #####结束##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/0MainActivity: #####开始##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/0数据: 3 05-18 10:57:55.070 4374-4374/zhangphil.app D/0MainActivity: #####结束##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/0MainActivity: #####开始##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/0数据: 4 05-18 10:57:55.070 4374-4374/zhangphil.app D/0MainActivity: #####结束##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/0MainActivity: #####开始##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/0数据: 5 05-18 10:57:55.070 4374-4374/zhangphil.app D/0MainActivity: #####结束##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/0MainActivity: #####开始##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/0数据: 6 05-18 10:57:55.070 4374-4374/zhangphil.app D/0MainActivity: #####结束##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/0MainActivity: #####开始##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/0数据: 7 05-18 10:57:55.070 4374-4374/zhangphil.app D/0MainActivity: #####结束##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/0MainActivity: #####开始##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/0数据: 8 05-18 10:57:55.070 4374-4374/zhangphil.app D/0MainActivity: #####结束##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/0MainActivity: #####开始##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/0数据: 9 05-18 10:57:55.070 4374-4374/zhangphil.app D/0MainActivity: #####结束##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/0MainActivity: onComplete 05-18 10:57:55.070 4374-4374/zhangphil.app D/1MainActivity: #####开始##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/1数据: 1 05-18 10:57:55.070 4374-4374/zhangphil.app D/1MainActivity: #####结束##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/1MainActivity: #####开始##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/1数据: 2 05-18 10:57:55.070 4374-4374/zhangphil.app D/1MainActivity: #####结束##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/1MainActivity: #####开始##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/1数据: 3 05-18 10:57:55.070 4374-4374/zhangphil.app D/1MainActivity: #####结束##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####开始##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1数据: 4 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####结束##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####开始##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1数据: 5 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####结束##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####开始##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1数据: 2 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####结束##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####开始##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1数据: 5 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####结束##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####开始##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1数据: 3 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####结束##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####开始##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1数据: 6 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####结束##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####开始##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1数据: 4 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####结束##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####开始##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1数据: 7 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####结束##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####开始##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1数据: 8 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####结束##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####开始##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1数据: 9 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####结束##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: onComplete