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

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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@Overridepublic 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>() {@Overridepublic void onNext(Object o) {Log.d(id + TAG, "#####开始#####");Log.d(id + "数据", String.valueOf(o));Log.d(id + TAG, "#####结束#####");}@Overridepublic void onComplete() {Log.d(id + TAG, "onComplete");}@Overridepublic void onError(Throwable e) {Log.e(id + TAG, e.toString(), e);}};return disposableObserver;}@Overrideprotected 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

 

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