RxJava 2.x 理解-2
操作符总结：
http://reactivex.io/documentation/operators.html
https://github.com/ReactiveX/RxJava/wiki
Operators By Category
Creating Observables ： 创建
Operators that originate new Observables.
Create— create an Observable from scratch by calling observer methods programmatically- — 基本创建方式
Defer— do not create the Observable until the observer subscribes, and create a fresh Observable for each observer- — 当观察者订阅时，才创建Observable，而不是像Create一样，执行Create就创建好了，在subscribe时才创建这个对象。并且针对每个观察者创建都是一个新的Observable。
Empty/Never/Throw— create Observables that have very precise and limited behavior- — 创建一个什么都不做直接onComplete的Observable
- — 创建一个什么都不做直接onError的Observable
- — 创建一个什么都不做的Observable
From— convert some other object or data structure into an Observable- — 发送集合
Interval— create an Observable that emits a sequence of integers spaced by a particular time interval- — 创建一个按照给定的时间间隔发射从0开始的整数序列的
Just— convert an object or a set of objects into an Observable that emits that or those objects- — 发送可变参数
Range— create an Observable that emits a range of sequential integers- — 创建一个发射指定范围的整数序列的
Observable<Integer> Repeat— create an Observable that emits a particular item or sequence of items repeatedly- — 重复发送，前提是已经有Obserable： http://www.introtorx.com/Content/v1.0.10621.0/12_CombiningSequences.html#Repeat
Start— create an Observable that emits the return value of a functionTimer— create an Observable that emits a single item after a given delay- — 计时器，延迟一段时间后执行
Transforming Observables ：变换
Operators that transform items that are emitted by an Observable.
Buffer— periodically gather items from an Observable into bundles and emit these bundles rather than emitting the items one at a time- — 缓存，可以简单的理解为缓存，它定期从Observable收集数据到一个集合，然后把这些数据集合打包发射，而不是一次发射一个
FlatMap— transform the items emitted by an Observable into Observables, then flatten the emissions from those into a single Observable- — 扁平映射，将Observable发射的数据变换为Observables集合，然后将这些Observable发射的数据平坦化的放进一个单独的Observable，可以认为是一个将嵌套的数据结构展开的过程。
GroupBy— divide an Observable into a set of Observables that each emit a different group of items from the original Observable, organized by key- — 分组，将原来的Observable分拆为Observable集合，将原始Observable发射的数据按Key分组，每一个Observable发射一组不同的数据。
Map— transform the items emitted by an Observable by applying a function to each item- — 映射，通过对序列的每一项都应用一个函数变换Observable发射的数据，实质是对序列中的每一项执行一个函数，函数的参数就是这个数据项
Scan— apply a function to each item emitted by an Observable, sequentially, and emit each successive value- — 扫描， 连续地对数据序列的每一项应用一个函数，然后连续发射结果,每一项结果基于之前的结果 --- 可以说Scan是 累加器函数.
Window— periodically subdivide items from an Observable into Observable windows and emit these windows rather than emitting the items one at a time- — 窗口，定期将来自Observable的数据分拆成一些Observable窗口，然后发射这些Observable窗口，而不是每次发射一项。类似于Buffer，但Buffer发射的是数据，Window发射的是Observable，每一个Observable发射原始Observable的数据的一个子集.
Filtering Observables ：过滤
Operators that selectively emit items from a source Observable.
Debounce— only emit an item from an Observable if a particular timespan has passed without it emitting another item- — 只有在空闲了一段时间后才发射数据，通俗的说，就是如果一段时间没有操作，就执行一次操作 : RxJava（七） 使用debounce操作符 优化app搜索功能
Distinct— suppress duplicate items emitted by an Observable- — 去重，过滤掉重复数据项
ElementAt— emit only item n emitted by an Observable- — 取值，取特定位置的数据项
Filter— emit only those items from an Observable that pass a predicate test- — 过滤，过滤掉没有通过谓词测试的数据项，只发射通过满足条件的
First— emit only the first item, or the first item that meets a condition, from an Observable- — 首项，只发射满足条件的第一条数据，即使后面满足的也不管了
IgnoreElements— do not emit any items from an Observable but mirror its termination notification- — 忽略所有的数据，只保留终止通知(onError或onCompleted)
Last— emit only the last item emitted by an Observable- — 末项，只发射满足条件的最后一条数据
Sample— emit the most recent item emitted by an Observable within periodic time intervals- — 在周期的时间间隔内，发射最新的数据，等于是数据抽样
Skip— suppress the first n items emitted by an Observable- — 跳过前面的若干项数据
SkipLast— suppress the last n items emitted by an Observable- — 跳过后面的若干项数据
Take— emit only the first n items emitted by an Observable- — 只保留前面的若干项数据
TakeLast— emit only the last n items emitted by an Observable- — 只保留后面的若干项数据
Combining Observables：组合
Operators that work with multiple source Observables to create a single Observable
And/Then/When— combine sets of items emitted by two or more Observables by means ofPatternandPlanintermediaries- — 通过模式(And条件)和计划(Then次序)组合两个或多个Observable发射的数据集
CombineLatest— when an item is emitted by either of two Observables, combine the latest item emitted by each Observable via a specified function and emit items based on the results of this function- — 当两个Observables中的任何一个发射了一个数据时，通过一个指定的函数组合每个Observable发射的最新数据（一共两个数据），然后发射这个函数的结果
Join— combine items emitted by two Observables whenever an item from one Observable is emitted during a time window defined according to an item emitted by the other Observable- — 无论何时，如果一个Observable发射了一个数据项，只要在另一个Observable发射的数据项定义的时间窗口内，就将两个Observable发射的数据合并发射
Merge— combine multiple Observables into one by merging their emissions- — 将两个Observable发射的数据组合并成一个
StartWith— emit a specified sequence of items before beginning to emit the items from the source Observable- — 在发射原来的Observable的数据序列之前，先发射一个指定的数据序列或数据项
Switch— convert an Observable that emits Observables into a single Observable that emits the items emitted by the most-recently-emitted of those Observables- — 将一个发射Observable序列的Observable转换为这样一个Observable：它逐个发射那些Observable最近发射的数据
Zip— combine the emissions of multiple Observables together via a specified function and emit single items for each combination based on the results of this function- — 打包，使用一个指定的函数将多个Observable发射的数据组合在一起，然后将这个函数的结果作为单项数据发射
Error Handling Operators :错误处理
Operators that help to recover from error notifications from an Observable
Catch— recover from anonErrornotification by continuing the sequence without error- — 捕获，继续序列操作，将错误替换为正常的数据，从onError通知中恢复
Retry— if a source Observable sends anonErrornotification, resubscribe to it in the hopes that it will complete without error- — 重试，如果Observable发射了一个错误通知，重新订阅它，期待它正常终止
Observable Utility Operators :辅助操作
A toolbox of useful Operators for working with Observables
Delay— shift the emissions from an Observable forward in time by a particular amount- — 延迟一段时间发射结果数据
Do— register an action to take upon a variety of Observable lifecycle events- — 注册一个操作来执行各种可观察的生命周期事件。观察调用的过程。
Materialize/Dematerialize— represent both the items emitted and the notifications sent as emitted items, or reverse this processObserveOn— specify the scheduler on which an observer will observe this Observable- — 指定观察者观察Observable的调度程序（工作线程）
Serialize— force an Observable to make serialized calls and to be well-behaved- — 强制Observable按次序发射数据并且功能是有效的
Subscribe— operate upon the emissions and notifications from an Observable- — 收到Observable发射的数据和通知后执行的操作
SubscribeOn— specify the scheduler an Observable should use when it is subscribed to- — 指定Observable应该在哪个调度程序上执行
TimeInterval— convert an Observable that emits items into one that emits indications of the amount of time elapsed between those emissions- — 将一个Observable转换为发射两个数据之间所耗费时间的Observable
Timeout— mirror the source Observable, but issue an error notification if a particular period of time elapses without any emitted items- — 添加超时机制，如果过了指定的一段时间没有发射数据，就发射一个错误通知
Timestamp— attach a timestamp to each item emitted by an Observable- — 给Observable发射的每个数据项添加一个时间戳
Using— create a disposable resource that has the same lifespan as the Observable- — 创建一个只在Observable的生命周期内存在的一次性资源
Conditional and Boolean Operators ： 条件和布尔操作
Operators that evaluate one or more Observables or items emitted by Observables
All— determine whether all items emitted by an Observable meet some criteria- — 判断Observable发射的所有的数据项是否都满足某个条件
Amb— given two or more source Observables, emit all of the items from only the first of these Observables to emit an item- — 给定多个Observable，只让第一个发射数据的Observable发射全部数据
Contains— determine whether an Observable emits a particular item or not- — 判断Observable是否会发射一个指定的数据项
DefaultIfEmpty— emit items from the source Observable, or a default item if the source Observable emits nothing- — 发射来自原始Observable的数据，如果原始Observable没有发射数据，就发射一个默认数据
SequenceEqual— determine whether two Observables emit the same sequence of items- — 判断两个Observable是否按相同的数据序列
SkipUntil— discard items emitted by an Observable until a second Observable emits an item- — 丢弃原始Observable发射的数据，直到第二个Observable发射了一个数据，然后发射原始Observable的剩余数据
SkipWhile— discard items emitted by an Observable until a specified condition becomes false- — 丢弃原始Observable发射的数据，直到一个特定的条件为假，然后发射原始Observable剩余的数据
TakeUntil— discard items emitted by an Observable after a second Observable emits an item or terminates- — 发射来自原始Observable的数据，直到第二个Observable发射了一个数据或一个通知
TakeWhile— discard items emitted by an Observable after a specified condition becomes false- — 发射原始Observable的数据，直到一个特定的条件为真，然后跳过剩余的数据
Mathematical and Aggregate Operators ： 算术和聚合操作
Operators that operate on the entire sequence of items emitted by an Observable
Average— calculates the average of numbers emitted by an Observable and emits this average- — 计算Observable发射的数据序列的平均值，然后发射这个结果
Concat— emit the emissions from two or more Observables without interleaving them- — 合并，不交错的连接多个Observable的数据（按顺序）/ 和 merge 不一样，这个是混序的
Count— count the number of items emitted by the source Observable and emit only this value- — 计算Observable发射的数据个数，然后发射这个结果
Max— determine, and emit, the maximum-valued item emitted by an Observable- — 计算并发射数据序列的最大值
Min— determine, and emit, the minimum-valued item emitted by an Observable- — 计算并发射数据序列的最小值
Reduce— apply a function to each item emitted by an Observable, sequentially, and emit the final value- — 按顺序对数据序列的每一个应用某个函数，然后返回这个值
Sum— calculate the sum of numbers emitted by an Observable and emit this sum- — 计算并发射数据序列的和
Connectable Observable Operators : 连接
Specialty Observables that have more precisely-controlled subscription dynamics
Connect— instruct a connectable Observable to begin emitting items to its subscribers- — 指示一个可连接的Observable开始发射数据给订阅者
Publish— convert an ordinary Observable into a connectable Observable- — 将一个普通的Observable转换为可连接的
RefCount— make a Connectable Observable behave like an ordinary Observable- — 使一个可连接的Observable表现得像一个普通的Observable
Replay— ensure that all observers see the same sequence of emitted items, even if they subscribe after the Observable has begun emitting items- — 确保所有的观察者收到同样的数据序列，即使他们在Observable开始发射数据之后才订阅
Operators to Convert Observables ： 转换操作
To— convert an Observable into another object or data structure- — 将Observable转换为其它的对象或数据结构
操作符决策树
几种主要的需求：
- 直接创建一个Observable（创建操作）
- 组合多个Observable（组合操作）
- 对Observable发射的数据执行变换操作（变换操作）
- 从Observable发射的数据中取特定的值（过滤操作）
- 转发Observable的部分值（条件/布尔/过滤操作）
- 对Observable发射的数据序列求值（算术/聚合操作）
package pers.bolin.rxjava2demo; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.util.Log; import java.util.ArrayList; import java.util.List; import java.util.concurrent.TimeUnit; import io.reactivex.CompletableObserver; import io.reactivex.Notification; import io.reactivex.Observable; import io.reactivex.ObservableEmitter; import io.reactivex.ObservableOnSubscribe; import io.reactivex.Observer; import io.reactivex.Scheduler; import io.reactivex.android.schedulers.AndroidSchedulers; import io.reactivex.annotations.NonNull; import io.reactivex.disposables.Disposable; import io.reactivex.functions.BiFunction; import io.reactivex.functions.Consumer; import io.reactivex.functions.Function; import io.reactivex.functions.Predicate; import io.reactivex.observables.GroupedObservable; import io.reactivex.schedulers.Schedulers; import io.reactivex.schedulers.Timed; public class MainActivity extends AppCompatActivity { private static final String TAG = "MainActivity"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //rxJava2BaseUser(); //rxJava2Thread(); //rxJava2Just(); //rxJava2From(); //rxJava2Buff(); //raJava2GroupBy(); //rxJava2Scan(); //rxJava2Window(); //rxJava2Distinct(); //rxJava2ElementAt(); //rxJava2Filter(); //rxJava2First(); //rxJava2IgnoreElements(); //rxJava2Last(); //rxJava2Sample(); //rxJava2Skip(); //rxJava2Take(); //rxJava2CombineLatest(); //rxJava2Merge(); //rxJava2StartWith(); //rxJava2Switch(); //rxJava2Zip(); //rxJava2Catch(); //rxJava2All(); //rxJava2Delay(); //rxJava2Do(); //rxJava2TimeInterval(); //rxJava2Timeout(); //rxJava2Timestamp(); rxJava2Concat(); } /** * rajava2 的基本使用 */ private void rxJava2BaseUser() { Observable .create(new ObservableOnSubscribe<String>() { @Override public void subscribe(@NonNull ObservableEmitter<String> emitter) throws Exception { emitter.onNext("1"); emitter.onNext("2"); emitter.onNext("3"); //throw new Exception("发生了错误"); } }) .subscribe(new Observer<String>() { Disposable disposable; // 新增该方法 @Override public void onSubscribe(@NonNull Disposable d) { Log.d(TAG, "onSubscribe"); disposable = d; } @Override public void onNext(@NonNull String s) { Log.d(TAG, "Item: " + s); if (s.equals("4")) disposable.dispose(); // 在RxJava 2.x 中，新增的Disposable可以做到切断的操作，让Observer观察者不再接收上游事件 } @Override public void onError(@NonNull Throwable e) { Log.d(TAG, "onError：" + e.getMessage()); } @Override public void onComplete() { Log.d(TAG, "onComplete"); } }); Observable .create(new ObservableOnSubscribe<String>() { @Override public void subscribe(@NonNull ObservableEmitter<String> emitter) throws Exception { emitter.onNext("----- 01 -----"); emitter.onNext("----- 02 -----"); emitter.onNext("----- 03 -----"); } }) // Consumer 和 RxJava 1 中的 Action1 类似 .subscribe(new Consumer<String>() { @Override public void accept(String s) throws Exception { Log.d(TAG, "Item: " + s); } }); Log.d(TAG, " ----------------- empty -----------------"); Observable.empty().subscribe(new Observer<Object>() { @Override public void onSubscribe(@NonNull Disposable d) { Log.d(TAG, "onSubscribe"); } @Override public void onNext(@NonNull Object o) { Log.d(TAG, "onNext"); } @Override public void onError(@NonNull Throwable e) { Log.d(TAG, "onError"); } @Override public void onComplete() { Log.d(TAG, "onComplete"); } }); Log.d(TAG, " ----------------- error -----------------"); Observable.error(new Exception()).subscribe(new Observer<Object>() { @Override public void onSubscribe(@NonNull Disposable d) { } @Override public void onNext(@NonNull Object o) { } @Override public void onError(@NonNull Throwable e) { } @Override public void onComplete() { } }); } /** * rajava2 线程 */ private void rxJava2Thread() { Observable .create(new ObservableOnSubscribe<String>() { @Override public void subscribe(@NonNull ObservableEmitter<String> emitter) throws Exception { Log.d(TAG, "事件处理线程:" + Thread.currentThread().getId()); emitter.onNext("---- 1 ----"); emitter.onNext("---- 2 ----"); emitter.onNext("---- 3 ----"); } }) .subscribeOn(Schedulers.trampoline()) // 指明被观察者处理的线程 .observeOn(AndroidSchedulers.mainThread()) // 指明观察者线程 .subscribe(new Observer<String>() { @Override public void onSubscribe(@NonNull Disposable d) { Log.d(TAG, "onSubscribe:" + Thread.currentThread().getName()); } @Override public void onNext(@NonNull String s) { Log.d(TAG, "Item: " + s + " :" + Thread.currentThread().getName()); } @Override public void onError(@NonNull Throwable e) { Log.d(TAG, "onError：" + e.getMessage() + " :" + Thread.currentThread().getName()); } @Override public void onComplete() { Log.d(TAG, "onComplete:" + Thread.currentThread().getName()); } }); } /** * rajava2 just 和 rajava1 的使用方式一致 */ private void rxJava2Just() { Observable .just(1, 2, 3, 4, 5, 6, 7) .subscribe(new Consumer<Integer>() { @Override public void accept(Integer integer) throws Exception { Log.d(TAG, "integer:" + integer); } }); Observable .just(1, 2, 3, 4, 5, 6, 7, 8) .subscribe(new Observer<Integer>() { @Override public void onSubscribe(@NonNull Disposable d) { Log.d(TAG, "onSubscribe"); } @Override public void onNext(@NonNull Integer integer) { Log.d(TAG, "integer:" + integer); } @Override public void onError(@NonNull Throwable e) { Log.d(TAG, "onError"); } @Override public void onComplete() { Log.d(TAG, "onComplete"); } }); } /** * rajava2 from 和 rajava1 的使用方式一致 */ private void rxJava2From() { List<String> data = new ArrayList<>(); data.add("hello world 1"); data.add("hello world 2"); Observable .fromIterable(data) .subscribe(new Consumer<String>() { @Override public void accept(String s) throws Exception { Log.d(TAG, s); } }); } /** * rajava2 buff * 结果： * 02-10 22:32:18.758 21300-21300/pers.bolin.rxjava2demo D/MainActivity: integers:[1, 2, 3, 4] * 02-10 22:32:18.759 21300-21300/pers.bolin.rxjava2demo D/MainActivity: integers:[5, 6] */ private void rxJava2Buff() { Observable.just(1, 2, 3, 4, 5, 6).buffer(4).subscribe(new Consumer<List<Integer>>() { @Override public void accept(List<Integer> integers) throws Exception { Log.d(TAG, "integers:" + integers.toString()); } }); } /** * rajava2 groupBy * 分组，将原来的Observable分拆为Observable集合，将原始Observable发射的数据按Key分组，每一个Observable发射一组不同的数据 * 结果： * 02-10 22:43:28.241 31495-31495/pers.bolin.rxjava2demo D/MainActivity: 奇数:1 * 02-10 22:43:28.242 31495-31495/pers.bolin.rxjava2demo D/MainActivity: 偶数:2 * 02-10 22:43:28.242 31495-31495/pers.bolin.rxjava2demo D/MainActivity: 奇数:3 * 02-10 22:43:28.242 31495-31495/pers.bolin.rxjava2demo D/MainActivity: 偶数:4 * 02-10 22:43:28.242 31495-31495/pers.bolin.rxjava2demo D/MainActivity: 奇数:5 * 02-10 22:43:28.242 31495-31495/pers.bolin.rxjava2demo D/MainActivity: 偶数:6 * 02-10 22:43:28.242 31495-31495/pers.bolin.rxjava2demo D/MainActivity: 奇数:7 */ private void raJava2GroupBy() { Observable.just(1, 2, 3, 4, 5, 6, 7).groupBy(new Function<Integer, Object>() { @Override public Object apply(@NonNull Integer integer) throws Exception { if (integer % 2 == 0) { return "偶数"; } else { return "奇数"; } } }).subscribe(new Consumer<GroupedObservable<Object, Integer>>() { @Override public void accept(GroupedObservable<Object, Integer> objectIntegerGroupedObservable) throws Exception { String type = (String) objectIntegerGroupedObservable.getKey(); if (type.equals("偶数")) { objectIntegerGroupedObservable.subscribe(new Consumer<Integer>() { @Override public void accept(Integer integer) throws Exception { Log.d(TAG, "偶数:" + integer); } }); } else if (type.equals("奇数")) { objectIntegerGroupedObservable.subscribe(new Consumer<Integer>() { @Override public void accept(Integer integer) throws Exception { Log.d(TAG, "奇数:" + integer); } }); } } }); } /** * rajava2 scan * 扫描， 连续地对数据序列的每一项应用一个函数，然后连续发射结果,每一项结果基于之前的结果 --- 可以说Scan是 累加器函数. * 结果： * 02-10 22:54:18.927 11193-11193/? D/MainActivity: scan:h * 02-10 22:54:18.927 11193-11193/? D/MainActivity: scan:he * 02-10 22:54:18.927 11193-11193/? D/MainActivity: scan:hel * 02-10 22:54:18.928 11193-11193/? D/MainActivity: scan:hell * 02-10 22:54:18.928 11193-11193/? D/MainActivity: scan:hell, * 02-10 22:54:18.928 11193-11193/? D/MainActivity: scan:hell,w * 02-10 22:54:18.928 11193-11193/? D/MainActivity: scan:hell,wo * 02-10 22:54:18.928 11193-11193/? D/MainActivity: scan:hell,wor * 02-10 22:54:18.928 11193-11193/? D/MainActivity: scan:hell,worl * 02-10 22:54:18.928 11193-11193/? D/MainActivity: scan:hell,world * 02-10 22:54:18.928 11193-11193/? D/MainActivity: scan:hell,world! */ private void rxJava2Scan() { Observable.fromArray("h", "e", "l", "l", ",", "w", "o", "r", "l", "d", "!").scan(new BiFunction<String, String, String>() { @Override public String apply(@NonNull String s, @NonNull String s2) throws Exception { // Log.d(TAG, "apply s :" + s); return s + s2; } }).subscribe(new Consumer<String>() { @Override public void accept(String s) throws Exception { Log.d(TAG, "scan:" + s); } }); } /** * rajava2 window * 窗口，定期将来自Observable的数据分拆成一些Observable窗口，然后发射这些Observable窗口，而不是每次发射一项。 * 类似于Buffer，但Buffer发射的是数据，Window发射的是Observable，每一个Observable发射原始Observable的数据的一个子集. * 结果： * 02-10 23:33:44.219 18440-18440/pers.bolin.rxjava2demo D/MainActivity: onSubscribe 1 * 02-10 23:33:44.221 18440-18440/pers.bolin.rxjava2demo D/MainActivity: onNext 1 * 02-10 23:33:44.222 18440-18440/pers.bolin.rxjava2demo D/MainActivity: onSubscribe 2 * 02-10 23:33:44.222 18440-18440/pers.bolin.rxjava2demo D/MainActivity: onNext 2:h * 02-10 23:33:44.222 18440-18440/pers.bolin.rxjava2demo D/MainActivity: onNext 2:e * 02-10 23:33:44.222 18440-18440/pers.bolin.rxjava2demo D/MainActivity: onNext 2:l * 02-10 23:33:44.222 18440-18440/pers.bolin.rxjava2demo D/MainActivity: onComplete 2 * 02-10 23:33:44.222 18440-18440/pers.bolin.rxjava2demo D/MainActivity: onNext 1 * 02-10 23:33:44.222 18440-18440/pers.bolin.rxjava2demo D/MainActivity: onSubscribe 2 * 02-10 23:33:44.223 18440-18440/pers.bolin.rxjava2demo D/MainActivity: onNext 2:l * 02-10 23:33:44.223 18440-18440/pers.bolin.rxjava2demo D/MainActivity: onNext 2:, * 02-10 23:33:44.223 18440-18440/pers.bolin.rxjava2demo D/MainActivity: onNext 2:w * 02-10 23:33:44.223 18440-18440/pers.bolin.rxjava2demo D/MainActivity: onComplete 2 * 02-10 23:33:44.223 18440-18440/pers.bolin.rxjava2demo D/MainActivity: onNext 1 * 02-10 23:33:44.223 18440-18440/pers.bolin.rxjava2demo D/MainActivity: onSubscribe 2 * 02-10 23:33:44.223 18440-18440/pers.bolin.rxjava2demo D/MainActivity: onNext 2:o * 02-10 23:33:44.223 18440-18440/pers.bolin.rxjava2demo D/MainActivity: onNext 2:r * 02-10 23:33:44.223 18440-18440/pers.bolin.rxjava2demo D/MainActivity: onNext 2:l * 02-10 23:33:44.223 18440-18440/pers.bolin.rxjava2demo D/MainActivity: onComplete 2 * 02-10 23:33:44.223 18440-18440/pers.bolin.rxjava2demo D/MainActivity: onNext 1 * 02-10 23:33:44.223 18440-18440/pers.bolin.rxjava2demo D/MainActivity: onSubscribe 2 * 02-10 23:33:44.223 18440-18440/pers.bolin.rxjava2demo D/MainActivity: onNext 2:d * 02-10 23:33:44.223 18440-18440/pers.bolin.rxjava2demo D/MainActivity: onNext 2:! * 02-10 23:33:44.224 18440-18440/pers.bolin.rxjava2demo D/MainActivity: onComplete 2 * 02-10 23:33:44.224 18440-18440/pers.bolin.rxjava2demo D/MainActivity: onComplete 1 */ private void rxJava2Window() { Observable.fromArray("h", "e", "l", "l", ",", "w", "o", "r", "l", "d", "!").window(3).subscribe(new Observer<Observable<String>>() { @Override public void onSubscribe(@NonNull Disposable d) { Log.d(TAG, "onSubscribe 1"); } @Override public void onNext(@NonNull Observable<String> stringObservable) { Log.d(TAG, "onNext 1"); stringObservable.subscribe(new Observer<String>() { @Override public void onSubscribe(@NonNull Disposable d) { Log.d(TAG, "onSubscribe 2"); } @Override public void onNext(@NonNull String s) { Log.d(TAG, "onNext 2:" + s); } @Override public void onError(@NonNull Throwable e) { Log.d(TAG, "onError 2"); } @Override public void onComplete() { Log.d(TAG, "onComplete 2"); } }); } @Override public void onError(@NonNull Throwable e) { Log.d(TAG, "onError 1"); } @Override public void onComplete() { Log.d(TAG, "onComplete 1"); } }); } /** * rxJava distinct * 去重，过滤掉重复数据项 * 结果： * 02-11 09:04:50.897 21403-21403/pers.bolin.rxjava2demo D/MainActivity: accept:h * 02-11 09:04:50.897 21403-21403/pers.bolin.rxjava2demo D/MainActivity: accept:e * 02-11 09:04:50.897 21403-21403/pers.bolin.rxjava2demo D/MainActivity: accept:l * 02-11 09:04:50.897 21403-21403/pers.bolin.rxjava2demo D/MainActivity: accept:, * 02-11 09:04:50.898 21403-21403/pers.bolin.rxjava2demo D/MainActivity: accept:w * 02-11 09:04:50.898 21403-21403/pers.bolin.rxjava2demo D/MainActivity: accept:o * 02-11 09:04:50.898 21403-21403/pers.bolin.rxjava2demo D/MainActivity: accept:r * 02-11 09:04:50.898 21403-21403/pers.bolin.rxjava2demo D/MainActivity: accept:d * 02-11 09:04:50.898 21403-21403/pers.bolin.rxjava2demo D/MainActivity: accept:! */ private void rxJava2Distinct() { Observable.fromArray("h", "e", "l", "l", ",", "w", "o", "r", "l", "d", "!").distinct().subscribe(new Consumer<String>() { @Override public void accept(String s) throws Exception { Log.d(TAG, "accept:" + s); } }); } /** * rxJava ElementAt * 取值，取特定位置的数据项 * 结果： * 02-11 09:07:23.761 24523-24523/pers.bolin.rxjava2demo D/MainActivity: accept:w */ private void rxJava2ElementAt() { Observable.fromArray("h", "e", "l", "l", ",", "w", "o", "r", "l", "d", "!").elementAt(5).subscribe(new Consumer<String>() { @Override public void accept(String s) throws Exception { Log.d(TAG, "accept:" + s); } }); } /** * rxJava Filter * 过滤，过滤掉没有通过谓词测试的数据项，只发射通过满足条件的 * 结果： * 02-11 09:11:33.980 28931-28931/? D/MainActivity: accept:8 * 02-11 09:11:33.980 28931-28931/? D/MainActivity: accept:9 * 02-11 09:11:33.980 28931-28931/? D/MainActivity: accept:10 */ private void rxJava2Filter() { Observable.fromArray(1, 2, 3, 4, 5, 6, 7, 8, 9, 10).filter(new Predicate<Integer>() { @Override public boolean test(@NonNull Integer integer) throws Exception { return integer > 7; } }).subscribe(new Consumer<Integer>() { @Override public void accept(Integer integer) throws Exception { Log.d(TAG, "accept:" + integer); } }); } /** * rxJava First * 首项，只发射满足条件的第一条数据,first(T defaultItem),参数是默认的item * 结果： * 02-11 09:17:47.644 3991-3991/pers.bolin.rxjava2demo D/MainActivity: accept:11 */ private void rxJava2First() { Observable .fromArray(1, 2, 3, 4, 5, 6, 7, 8, 9, 10) .filter(new Predicate<Integer>() { @Override public boolean test(@NonNull Integer integer) throws Exception { return integer > 10; } }) //first(T defaultItem) .first(11).subscribe(new Consumer<Integer>() { @Override public void accept(Integer integer) throws Exception { Log.d(TAG, "accept:" + integer); } }); } /** * rxJava IgnoreElements * 忽略所有的数据，只保留终止通知(onError或onCompleted) * 结果： * 02-11 09:21:37.641 8822-8822/pers.bolin.rxjava2demo D/MainActivity: onSubscribe * 02-11 09:21:37.642 8822-8822/pers.bolin.rxjava2demo D/MainActivity: onError：java.lang.Exception: 抛出错误信息 */ private void rxJava2IgnoreElements() { Observable .error(new Exception("抛出错误信息")) .ignoreElements() .subscribe(new CompletableObserver() { @Override public void onSubscribe(@NonNull Disposable d) { Log.d(TAG, "onSubscribe"); } @Override public void onComplete() { Log.d(TAG, "onComplete"); } @Override public void onError(@NonNull Throwable e) { Log.d(TAG, "onError：" + e); } }); } /** * rxJava Last * 末项，只发射满足条件的最后一条数据 * 结果： * 02-11 09:37:36.570 26512-26512/pers.bolin.rxjava2demo D/MainActivity: accept:8 */ private void rxJava2Last() { Observable.just(1, 2, 3, 4, 5, 6, 7, 8) .filter(new Predicate<Integer>() { @Override public boolean test(@NonNull Integer integer) throws Exception { return integer > 5; } }) .last(0).subscribe(new Consumer<Integer>() { @Override public void accept(Integer integer) throws Exception { Log.d(TAG, "accept:" + integer); } }); } /** * rxJava Sample * 在周期的时间间隔内，发射最新的数据，等于是数据抽样 * 结果： * 02-11 09:42:44.323 30993-31516/pers.bolin.rxjava2demo D/MainActivity: accept:0 * 02-11 09:42:46.324 30993-31516/pers.bolin.rxjava2demo D/MainActivity: accept:2 * 02-11 09:42:48.325 30993-31516/pers.bolin.rxjava2demo D/MainActivity: accept:4 * 02-11 09:42:50.324 30993-31516/pers.bolin.rxjava2demo D/MainActivity: accept:6 * 02-11 09:42:52.325 30993-31516/pers.bolin.rxjava2demo D/MainActivity: accept:8 * 02-11 09:42:54.325 30993-31516/pers.bolin.rxjava2demo D/MainActivity: accept:10 * 02-11 09:42:56.324 30993-31516/pers.bolin.rxjava2demo D/MainActivity: accept:12 */ private void rxJava2Sample() { Observable.interval(1, TimeUnit.SECONDS).sample(2, TimeUnit.SECONDS).subscribe(new Consumer<Long>() { @Override public void accept(Long aLong) throws Exception { Log.d(TAG, "accept:" + aLong); } }); } /** * rxJava Skip * 跳过前面的若干项数据 * 结果： * 02-11 09:47:28.912 4294-4294/pers.bolin.rxjava2demo D/MainActivity: accept:4 * 02-11 09:47:28.912 4294-4294/pers.bolin.rxjava2demo D/MainActivity: accept:5 * 02-11 09:47:28.912 4294-4294/pers.bolin.rxjava2demo D/MainActivity: accept:6 * 02-11 09:47:28.912 4294-4294/pers.bolin.rxjava2demo D/MainActivity: accept:7 * 02-11 09:47:28.912 4294-4294/pers.bolin.rxjava2demo D/MainActivity: accept:8 */ private void rxJava2Skip() { Observable.just(1, 2, 3, 4, 5, 6, 7, 8).skip(3).subscribe(new Consumer<Integer>() { @Override public void accept(Integer integer) throws Exception { Log.d(TAG, "accept:" + integer); } }); } /** * rxJava Take * 只保留前面的若干项数据 * 结果： * 02-11 09:50:50.527 8603-8677/pers.bolin.rxjava2demo D/MainActivity: accept:0 * 02-11 09:50:51.528 8603-8677/pers.bolin.rxjava2demo D/MainActivity: accept:1 * 02-11 09:50:52.529 8603-8677/pers.bolin.rxjava2demo D/MainActivity: accept:2 * 02-11 09:50:53.529 8603-8677/pers.bolin.rxjava2demo D/MainActivity: accept:3 * 02-11 09:50:54.528 8603-8677/pers.bolin.rxjava2demo D/MainActivity: accept:4 */ private void rxJava2Take() { Observable.interval(1, TimeUnit.SECONDS).take(5).subscribe(new Consumer<Long>() { @Override public void accept(Long aLong) throws Exception { Log.d(TAG, "accept:" + aLong); } }); } /** * rxJava2 CombineLatest * 当两个Observables中的任何一个发射了一个数据时，通过一个指定的函数组合每个Observable发射的最新数据（一共两个数据），然后发射这个函数的结果 * 结果： * 02-11 11:05:23.292 27905-28474/pers.bolin.rxjava2demo D/MainActivity: s: 0 * 02-11 11:05:23.293 27905-28474/pers.bolin.rxjava2demo D/MainActivity: s2: 0 * 02-11 11:05:23.293 27905-28474/pers.bolin.rxjava2demo D/MainActivity: accept: 0 * 02-11 11:05:23.293 27905-28474/pers.bolin.rxjava2demo D/MainActivity: s: 0 * 02-11 11:05:23.293 27905-28474/pers.bolin.rxjava2demo D/MainActivity: s2: 1 * 02-11 11:05:23.293 27905-28474/pers.bolin.rxjava2demo D/MainActivity: accept: 1 * 02-11 11:05:24.293 27905-28475/pers.bolin.rxjava2demo D/MainActivity: s: 0 * 02-11 11:05:24.293 27905-28475/pers.bolin.rxjava2demo D/MainActivity: s2: 2 * 02-11 11:05:24.293 27905-28475/pers.bolin.rxjava2demo D/MainActivity: accept: 2 * 02-11 11:05:25.294 27905-28474/pers.bolin.rxjava2demo D/MainActivity: s: 1 * 02-11 11:05:25.295 27905-28474/pers.bolin.rxjava2demo D/MainActivity: s2: 2 * 02-11 11:05:25.295 27905-28474/pers.bolin.rxjava2demo D/MainActivity: accept: 3 * 02-11 11:05:25.295 27905-28474/pers.bolin.rxjava2demo D/MainActivity: s: 1 * 02-11 11:05:25.296 27905-28474/pers.bolin.rxjava2demo D/MainActivity: s2: 3 * 02-11 11:05:25.296 27905-28474/pers.bolin.rxjava2demo D/MainActivity: accept: 4 * 02-11 11:05:26.295 27905-28475/pers.bolin.rxjava2demo D/MainActivity: s: 1 * 02-11 11:05:26.296 27905-28475/pers.bolin.rxjava2demo D/MainActivity: s2: 4 * 02-11 11:05:26.296 27905-28475/pers.bolin.rxjava2demo D/MainActivity: accept: 5 * 02-11 11:05:27.295 27905-28474/pers.bolin.rxjava2demo D/MainActivity: s: 2 * 02-11 11:05:27.295 27905-28474/pers.bolin.rxjava2demo D/MainActivity: s2: 4 * 02-11 11:05:27.296 27905-28474/pers.bolin.rxjava2demo D/MainActivity: accept: 6 * 02-11 11:05:29.293 27905-28474/pers.bolin.rxjava2demo D/MainActivity: s: 3 * 02-11 11:05:29.293 27905-28474/pers.bolin.rxjava2demo D/MainActivity: s2: 4 * 02-11 11:05:29.293 27905-28474/pers.bolin.rxjava2demo D/MainActivity: accept: 7 * 02-11 11:05:31.294 27905-28474/pers.bolin.rxjava2demo D/MainActivity: s: 4 * 02-11 11:05:31.295 27905-28474/pers.bolin.rxjava2demo D/MainActivity: s2: 4 * 02-11 11:05:31.295 27905-28474/pers.bolin.rxjava2demo D/MainActivity: accept: 8 */ private void rxJava2CombineLatest() { Observable<Long> o1 = Observable.interval(2, TimeUnit.SECONDS).take(5); Observable<Long> o2 = Observable.interval(1, TimeUnit.SECONDS).take(5); Observable.combineLatest(o1, o2, new BiFunction<Long, Long, Long>() { @Override public Long apply(Long s, Long s2) throws Exception { Log.d(TAG, "s: " + s); Log.d(TAG, "s2: " + s2); return s + s2; } }).subscribe(new Consumer<Long>() { @Override public void accept(Long s) throws Exception { Log.d(TAG, "accept: " + s); } }); } /** * rxJava Merge * 将两个Observable发射的数据组合并成一个，但顺序不是先A在B * 结果： * 02-11 11:44:24.402 27774-27822/pers.bolin.rxjava2demo D/MainActivity: accept: 0 * 02-11 11:44:25.403 27774-27821/pers.bolin.rxjava2demo D/MainActivity: accept: 0 * 02-11 11:44:25.409 27774-27822/pers.bolin.rxjava2demo D/MainActivity: accept: 1 * 02-11 11:44:26.404 27774-27822/pers.bolin.rxjava2demo D/MainActivity: accept: 2 * 02-11 11:44:27.403 27774-27821/pers.bolin.rxjava2demo D/MainActivity: accept: 1 * 02-11 11:44:29.403 27774-27821/pers.bolin.rxjava2demo D/MainActivity: accept: 2 * 02-11 11:44:31.402 27774-27821/pers.bolin.rxjava2demo D/MainActivity: accept: 3 * 02-11 11:44:33.403 27774-27821/pers.bolin.rxjava2demo D/MainActivity: accept: 4 */ private void rxJava2Merge() { Observable<Long> o1 = Observable.interval(2, TimeUnit.SECONDS).take(5); Observable<Long> o2 = Observable.interval(1, TimeUnit.SECONDS).take(3); Observable.merge(o1, o2)//使用merge操作符将两个被观察者合并 //.subscribeOn(Schedulers.newThread()) //.observeOn(AndroidSchedulers.mainThread()) .subscribe(new Consumer<Long>() { @Override public void accept(Long s) throws Exception { Log.d(TAG, "accept: " + s); } }); } /** * rxJava StartWith * 在发射原来的Observable的数据序列之前，先发射一个指定的数据序列或数据项 * 结果： * 02-11 11:48:42.394 31994-31994/? D/MainActivity: accept: -1 * 02-11 11:48:42.394 31994-31994/? D/MainActivity: accept: -2 * 02-11 11:48:42.394 31994-31994/? D/MainActivity: accept: -3 * 02-11 11:48:42.394 31994-31994/? D/MainActivity: accept: -4 * 02-11 11:48:42.394 31994-31994/? D/MainActivity: accept: 1 * 02-11 11:48:42.395 31994-31994/? D/MainActivity: accept: 2 * 02-11 11:48:42.395 31994-31994/? D/MainActivity: accept: 3 * 02-11 11:48:42.395 31994-31994/? D/MainActivity: accept: 4 * 02-11 11:48:42.395 31994-31994/? D/MainActivity: accept: 5 */ private void rxJava2StartWith() { Observable.just(1, 2, 3, 4, 5) .startWith(Observable.just(-1, -2, -3, -4)) .subscribe(new Consumer<Integer>() { @Override public void accept(Integer integer) throws Exception { Log.d(TAG, "accept: " + integer); } }); } /** * rxJava Switch * 结果： * 02-11 13:57:11.076 31646-31646/pers.bolin.rxjava2demo D/MainActivity: onSubscribe * 02-11 13:57:11.077 31646-31646/pers.bolin.rxjava2demo D/MainActivity: subscribeActual * 02-11 13:57:11.077 31646-31646/pers.bolin.rxjava2demo D/MainActivity: onNext:null */ private void rxJava2Switch() { Observable.just(1, 2).filter(new Predicate<Integer>() { @Override public boolean test(@NonNull Integer integer) throws Exception { return integer > 3; } }).switchIfEmpty(new Observable<Integer>() { @Override protected void subscribeActual(Observer<? super Integer> observer) { Log.d(TAG, "subscribeActual"); observer.onNext(-1); } }).map(new Function<Integer, String>() { @Override public String apply(@NonNull Integer integer) throws Exception { if (integer < 0) return "null"; return integer + ""; } }).subscribe(new Observer<String>() { @Override public void onSubscribe(@NonNull Disposable d) { Log.d(TAG, "onSubscribe"); } @Override public void onNext(@NonNull String integer) { Log.d(TAG, "onNext:" + integer); } @Override public void onError(@NonNull Throwable e) { Log.d(TAG, "onError"); } @Override public void onComplete() { Log.d(TAG, "onComplete"); } }); } /** * rxJava Zip * 打包，使用一个指定的函数将多个Observable发射的数据组合在一起，然后将这个函数的结果作为单项数据发射 * 结果： * 02-11 14:06:16.669 8886-8886/pers.bolin.rxjava2demo D/MainActivity: aLong: 1 aLong2:2 * 02-11 14:06:16.669 8886-8886/pers.bolin.rxjava2demo D/MainActivity: accept: 3 * 02-11 14:06:16.669 8886-8886/pers.bolin.rxjava2demo D/MainActivity: aLong: 2 aLong2:4 * 02-11 14:06:16.669 8886-8886/pers.bolin.rxjava2demo D/MainActivity: accept: 6 * 02-11 14:06:16.669 8886-8886/pers.bolin.rxjava2demo D/MainActivity: aLong: 3 aLong2:6 * 02-11 14:06:16.669 8886-8886/pers.bolin.rxjava2demo D/MainActivity: accept: 9 * 02-11 14:06:16.670 8886-8886/pers.bolin.rxjava2demo D/MainActivity: aLong: 4 aLong2:8 * 02-11 14:06:16.670 8886-8886/pers.bolin.rxjava2demo D/MainActivity: accept: 12 * 02-11 14:06:16.670 8886-8886/pers.bolin.rxjava2demo D/MainActivity: aLong: 5 aLong2:10 * 02-11 14:06:16.670 8886-8886/pers.bolin.rxjava2demo D/MainActivity: accept: 15 */ private void rxJava2Zip() { Observable<Long> o1 = Observable.just(1L, 2L, 3L, 4L, 5L, 6L); Observable<Long> o2 = Observable.just(2L, 4L, 6L, 8L, 10L); Observable.zip(o1, o2, new BiFunction<Long, Long, String>() { @Override public String apply(@NonNull Long aLong, @NonNull Long aLong2) throws Exception { Log.d(TAG, "aLong: " + aLong + " aLong2:" + aLong2); return aLong + aLong2 + ""; } }).subscribe(new Consumer<String>() { @Override public void accept(String s) throws Exception { Log.d(TAG, "accept: " + s); } }); } /** * rxJava Catch * 捕获，继续序列操作，将错误替换为正常的数据，从onError通知中恢复 * 结果： * 02-11 14:11:23.751 14001-14001/pers.bolin.rxjava2demo D/MainActivity: accept: 0 */ private void rxJava2Catch() { Observable.error(new Exception("抛出了一个错误")).onErrorReturn(new Function<Throwable, Integer>() { @Override public Integer apply(@NonNull Throwable throwable) throws Exception { return 0; } }).subscribe(new Consumer<Object>() { @Override public void accept(Object o) throws Exception { Log.d(TAG, "accept: " + o); } }); } /** * rxJava Delay * 延迟一段时间发射结果数据 * 结果： * 02-11 14:32:25.382 6261-6348/pers.bolin.rxjava2demo D/MainActivity: subscribe currentThread id:2550 * 02-11 14:32:25.384 6261-6348/pers.bolin.rxjava2demo D/MainActivity: subscribe currentThread id:2550 * 02-11 14:32:26.384 6261-6261/pers.bolin.rxjava2demo D/MainActivity: accept: 1 currentThread id:2 * 02-11 14:32:26.384 6261-6261/pers.bolin.rxjava2demo D/MainActivity: accept: 2 currentThread id:2 * 02-11 14:32:26.384 6261-6261/pers.bolin.rxjava2demo D/MainActivity: accept: 3 currentThread id:2 * 02-11 14:32:26.384 6261-6261/pers.bolin.rxjava2demo D/MainActivity: accept: 4 currentThread id:2 * 02-11 14:32:26.385 6261-6261/pers.bolin.rxjava2demo D/MainActivity: accept: 5 currentThread id:2 */ private void rxJava2Delay() { Observable .create(new ObservableOnSubscribe<Integer>() { @Override public void subscribe(@NonNull ObservableEmitter<Integer> emitter) throws Exception { Log.d(TAG, "subscribe currentThread id:" + Thread.currentThread().getId()); emitter.onNext(1); emitter.onNext(2); emitter.onNext(3); emitter.onNext(4); emitter.onNext(5); Log.d(TAG, "subscribe currentThread id:" + Thread.currentThread().getId()); } }) .delay(1, TimeUnit.SECONDS) .subscribeOn(Schedulers.newThread()) .observeOn(AndroidSchedulers.mainThread()) .subscribe(new Consumer<Integer>() { @Override public void accept(Integer integer) throws Exception { Log.d(TAG, "accept: " + integer + " currentThread id:" + Thread.currentThread().getId()); } }); } /** * rxJava Do * 注册一个操作来执行各种可观察的生命周期事件。观察调用的过程。 * 结果： * 02-11 14:45:57.925 21207-21207/pers.bolin.rxjava2demo D/MainActivity: doOnNext accept: 1 * 02-11 14:45:57.925 21207-21207/pers.bolin.rxjava2demo D/MainActivity: doOnNext accept: 2 * 02-11 14:45:57.925 21207-21207/pers.bolin.rxjava2demo D/MainActivity: doOnNext accept: 3 * 02-11 14:45:57.925 21207-21207/pers.bolin.rxjava2demo D/MainActivity: accept: 3 * 02-11 14:45:57.925 21207-21207/pers.bolin.rxjava2demo D/MainActivity: doOnNext accept: 4 * 02-11 14:45:57.925 21207-21207/pers.bolin.rxjava2demo D/MainActivity: accept: 4 * 02-11 14:45:57.926 21207-21207/pers.bolin.rxjava2demo D/MainActivity: doOnNext accept: 5 * 02-11 14:45:57.926 21207-21207/pers.bolin.rxjava2demo D/MainActivity: accept: 5 */ private void rxJava2Do() { Observable .just(1, 2, 3, 4, 5) .doOnNext(new Consumer<Integer>() { @Override public void accept(Integer integer) throws Exception { Log.d(TAG, "doOnNext accept: " + integer); } }) .filter(new Predicate<Integer>() { @Override public boolean test(@NonNull Integer integer) throws Exception { return integer > 2; } }) .subscribe(new Consumer<Integer>() { @Override public void accept(Integer integer) throws Exception { Log.d(TAG, "accept: " + integer); } }); } /** * rxJava TimeInterval * 将一个Observable转换为发射两个数据之间所耗费时间的Observable * 结果： * 02-11 15:12:28.955 14639-14639/? D/MainActivity: integerTimed:Timed[time=0, unit=MILLISECONDS, value=1] * 02-11 15:12:28.955 14639-14639/? D/MainActivity: integerTimed:Timed[time=1, unit=MILLISECONDS, value=2] * 02-11 15:12:28.955 14639-14639/? D/MainActivity: integerTimed:Timed[time=0, unit=MILLISECONDS, value=3] * 02-11 15:12:28.955 14639-14639/? D/MainActivity: integerTimed:Timed[time=0, unit=MILLISECONDS, value=4] * 02-11 15:12:28.956 14639-14639/? D/MainActivity: integerTimed:Timed[time=0, unit=MILLISECONDS, value=5] * 02-11 15:12:28.956 14639-14639/? D/MainActivity: integerTimed:Timed[time=1, unit=MILLISECONDS, value=6] */ private void rxJava2TimeInterval() { Observable.just(1, 2, 3, 4, 5, 6).timeInterval().subscribe(new Consumer<Timed<Integer>>() { @Override public void accept(Timed<Integer> integerTimed) throws Exception { Log.d(TAG, "integerTimed:" + integerTimed); } }); } /** * rxJava Timeout * 添加超时机制，如果过了指定的一段时间没有发射数据，就发射一个错误通知 * 结果： * 02-11 15:17:39.709 21248-21248/pers.bolin.rxjava2demo D/MainActivity: onSubscribe * 02-11 15:17:44.711 21248-21324/pers.bolin.rxjava2demo D/MainActivity: onError:null */ private void rxJava2Timeout() { Observable.interval(6, TimeUnit.SECONDS).timeout(5, TimeUnit.SECONDS) .subscribe(new Observer<Long>() { @Override public void onSubscribe(@NonNull Disposable d) { Log.d(TAG, "onSubscribe"); } @Override public void onNext(@NonNull Long aLong) { Log.d(TAG, "onNext:" + aLong); } @Override public void onError(@NonNull Throwable e) { Log.d(TAG, "onError:" + e.getMessage()); } @Override public void onComplete() { Log.d(TAG, "onComplete"); } }); } /** * rxJava Timestamp * 给Observable发射的每个数据项添加一个时间戳 * 结果: * 02-11 15:19:31.777 23124-23124/? D/MainActivity: integerTimed:Timed[time=1518333571776, unit=MILLISECONDS, value=1] * 02-11 15:19:31.777 23124-23124/? D/MainActivity: integerTimed:Timed[time=1518333571777, unit=MILLISECONDS, value=2] * 02-11 15:19:31.777 23124-23124/? D/MainActivity: integerTimed:Timed[time=1518333571777, unit=MILLISECONDS, value=3] * 02-11 15:19:31.777 23124-23124/? D/MainActivity: integerTimed:Timed[time=1518333571777, unit=MILLISECONDS, value=4] * 02-11 15:19:31.777 23124-23124/? D/MainActivity: integerTimed:Timed[time=1518333571777, unit=MILLISECONDS, value=5] * 02-11 15:19:31.777 23124-23124/? D/MainActivity: integerTimed:Timed[time=1518333571777, unit=MILLISECONDS, value=6] */ private void rxJava2Timestamp() { Observable.just(1, 2, 3, 4, 5, 6).timestamp().subscribe(new Consumer<Timed<Integer>>() { @Override public void accept(Timed<Integer> integerTimed) throws Exception { Log.d(TAG, "integerTimed:" + integerTimed); } }); } /** * rxJava All * 判断Observable发射的所有的数据项是否都满足某个条件 * 结果： * 02-11 14:22:59.498 26352-26352/pers.bolin.rxjava2demo D/MainActivity: accept: false */ private void rxJava2All() { Observable .just(1, 2, 3, 4, 5) .all(new Predicate<Integer>() { @Override public boolean test(@NonNull Integer integer) throws Exception { return integer > 1; } }).subscribe(new Consumer<Boolean>() { @Override public void accept(Boolean aBoolean) throws Exception { Log.d(TAG, "accept: " + aBoolean); } }); } /** * rxJava Concat * 合并，不交错的连接多个Observable的数据（按顺序） * 结果： * 02-11 16:10:08.505 26030-26094/pers.bolin.rxjava2demo D/MainActivity: accept: 0 * 02-11 16:10:09.506 26030-26094/pers.bolin.rxjava2demo D/MainActivity: accept: 1 * 02-11 16:10:10.505 26030-26094/pers.bolin.rxjava2demo D/MainActivity: accept: 2 * 02-11 16:10:11.505 26030-26094/pers.bolin.rxjava2demo D/MainActivity: accept: 3 * 02-11 16:10:12.506 26030-26094/pers.bolin.rxjava2demo D/MainActivity: accept: 4 * 02-11 16:10:13.510 26030-26333/pers.bolin.rxjava2demo D/MainActivity: accept: 0 * 02-11 16:10:14.510 26030-26333/pers.bolin.rxjava2demo D/MainActivity: accept: 1 * 02-11 16:10:15.509 26030-26333/pers.bolin.rxjava2demo D/MainActivity: accept: 2 * 02-11 16:10:16.508 26030-26333/pers.bolin.rxjava2demo D/MainActivity: accept: 3 */ private void rxJava2Concat() { Observable.merge(Observable.interval(1, TimeUnit.SECONDS).take(5), Observable.interval(1, TimeUnit.SECONDS).take(4)).subscribe(new Consumer<Long>() { @Override public void accept(Long aLong) throws Exception { Log.d(TAG, "accept: " + aLong); } }); } }
参考资料：
https://www.zhihu.com/question/32209660
