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

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: 105-18 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: 205-18 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: 305-18 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: 405-18 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: 505-18 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: 605-18 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: 705-18 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: 805-18 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: 905-18 10:57:55.070 4374-4374/zhangphil.app D/0MainActivity: #####结束#####05-18 10:57:55.070 4374-4374/zhangphil.app D/0MainActivity: onComplete05-18 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: 105-18 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: 205-18 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: 305-18 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: 405-18 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: 505-18 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: 205-18 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: 505-18 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: 305-18 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: 605-18 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: 405-18 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: 705-18 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: 805-18 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: 905-18 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