RxJava2 / RxAndroid2操作符distinct去重

distinct去除重复的数据，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, 2, 2, 3, 4, 5, 5, 6, 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() { DisposableObserver disposableObserver = new DisposableObserver() { @Override public void onNext(Integer i) { Log.d(TAG, "#####开始#####"); Log.d("数据", String.valueOf(i)); Log.d(TAG, "#####结束#####"); } @Override public void onComplete() { Log.d(TAG, "onComplete"); } @Override public void onError(Throwable e) { Log.e(TAG, e.toString(), e); } }; Observable observable = Observable.fromArray(test_data); mCompositeDisposable.add(observable .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .distinct() .subscribeWith(disposableObserver)); } @Override protected void onDestroy() { super.onDestroy(); // 如果退出程序，就清除后台任务 mCompositeDisposable.clear(); } }

代码输出：

05-18 10:19:32.361 2346-2346/zhangphil.app D/MainActivity: #####开始##### 05-18 10:19:32.361 2346-2346/zhangphil.app D/数据: 1 05-18 10:19:32.361 2346-2346/zhangphil.app D/MainActivity: #####结束##### 05-18 10:19:32.362 2346-2346/zhangphil.app D/MainActivity: #####开始##### 05-18 10:19:32.362 2346-2346/zhangphil.app D/数据: 2 05-18 10:19:32.362 2346-2346/zhangphil.app D/MainActivity: #####结束##### 05-18 10:19:32.362 2346-2346/zhangphil.app D/MainActivity: #####开始##### 05-18 10:19:32.362 2346-2346/zhangphil.app D/数据: 3 05-18 10:19:32.362 2346-2346/zhangphil.app D/MainActivity: #####结束##### 05-18 10:19:32.362 2346-2346/zhangphil.app D/MainActivity: #####开始##### 05-18 10:19:32.362 2346-2346/zhangphil.app D/数据: 4 05-18 10:19:32.362 2346-2346/zhangphil.app D/MainActivity: #####结束##### 05-18 10:19:32.362 2346-2346/zhangphil.app D/MainActivity: #####开始##### 05-18 10:19:32.362 2346-2346/zhangphil.app D/数据: 5 05-18 10:19:32.362 2346-2346/zhangphil.app D/MainActivity: #####结束##### 05-18 10:19:32.362 2346-2346/zhangphil.app D/MainActivity: #####开始##### 05-18 10:19:32.362 2346-2346/zhangphil.app D/数据: 6 05-18 10:19:32.362 2346-2346/zhangphil.app D/MainActivity: #####结束##### 05-18 10:19:32.362 2346-2346/zhangphil.app D/MainActivity: #####开始##### 05-18 10:19:32.362 2346-2346/zhangphil.app D/数据: 7 05-18 10:19:32.362 2346-2346/zhangphil.app D/MainActivity: #####结束##### 05-18 10:19:32.362 2346-2346/zhangphil.app D/MainActivity: #####开始##### 05-18 10:19:32.362 2346-2346/zhangphil.app D/数据: 8 05-18 10:19:32.362 2346-2346/zhangphil.app D/MainActivity: #####结束##### 05-18 10:19:32.362 2346-2346/zhangphil.app D/MainActivity: #####开始##### 05-18 10:19:32.362 2346-2346/zhangphil.app D/数据: 9 05-18 10:19:32.362 2346-2346/zhangphil.app D/MainActivity: #####结束##### 05-18 10:19:32.362 2346-2346/zhangphil.app D/MainActivity: onComplete