RxJava2 / RxAndroid2的merge操作合并多个Observable

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RxJava2/RxAndroid2的merge操作合并多个Observable

RxAndroid2/RxJava2的merge操作合并若干个Observable为单个可观测的Observable，形成单一线性的Observable输出结果，例如代码：

package zhangphil.app;import android.os.Bundle;import android.support.annotation.NonNull;import android.support.annotation.Nullable;import android.support.v7.app.AppCompatActivity;import android.util.Log;import java.util.concurrent.Callable;import io.reactivex.Observable;import io.reactivex.android.schedulers.AndroidSchedulers;import io.reactivex.disposables.CompositeDisposable;import io.reactivex.functions.BiFunction;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();    @Override    public void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        test();    }    private void test() {        DisposableObserver disposableObserver = new DisposableObserver<String>() {            @Override            public void onNext(String s) {                Log.d(TAG, "#####开始#####");                Log.d(TAG + "数据", String.valueOf(s));                Log.d(TAG, "#####结束#####");            }            @Override            public void onComplete() {            }            @Override            public void onError(Throwable e) {                Log.e(TAG, e.toString(), e);            }        };        mCompositeDisposable.add(                Observable.merge(                        getObservableA(null),                        getObservableB(null),                        getObservableA(null),                        getObservableB(null))                        .subscribeOn(Schedulers.io())                        .observeOn(AndroidSchedulers.mainThread())                        .subscribeWith(disposableObserver));    }    @Override    protected void onDestroy() {        super.onDestroy();        // 如果退出程序，就清除后台任务        mCompositeDisposable.clear();    }    private Observable<String> getObservableA(Object o) {        return Observable.fromCallable(new Callable<String>() {            @Override            public String call() throws Exception {                try {                    Thread.sleep(500); // 假设此处是耗时操作                } catch (Exception e) {                    e.printStackTrace();                }                return "A";            }        });    }    private Observable<String> getObservableB(Object o) {        return Observable.fromCallable(new Callable<String>() {            @Override            public String call() throws Exception {                try {                    Thread.sleep(1000); // 假设此处是耗时操作                } catch (Exception e) {                    e.printStackTrace();                }                return "B";            }        });    }}

代码输出结果：

05-15 13:40:41.929 12972-12972/zhangphil.app D/MainActivity: #####开始#####05-15 13:40:41.929 12972-12972/zhangphil.app D/MainActivity数据: A05-15 13:40:41.929 12972-12972/zhangphil.app D/MainActivity: #####结束#####05-15 13:40:42.930 12972-12972/zhangphil.app D/MainActivity: #####开始#####05-15 13:40:42.930 12972-12972/zhangphil.app D/MainActivity数据: B05-15 13:40:42.930 12972-12972/zhangphil.app D/MainActivity: #####结束#####05-15 13:40:43.430 12972-12972/zhangphil.app D/MainActivity: #####开始#####05-15 13:40:43.431 12972-12972/zhangphil.app D/MainActivity数据: A05-15 13:40:43.431 12972-12972/zhangphil.app D/MainActivity: #####结束#####05-15 13:40:44.431 12972-12972/zhangphil.app D/MainActivity: #####开始#####05-15 13:40:44.431 12972-12972/zhangphil.app D/MainActivity数据: B05-15 13:40:44.431 12972-12972/zhangphil.app D/MainActivity: #####结束#####

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