RxJava2 / RxAndroid2操作符distinct去重

た入场券 2024-02-17 22:11 63阅读 0赞

**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<Integer>() {
                @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<Integer> 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