RxJava学习笔记一

本学习笔记来自本人学习总结得出，学习参考内容大部分来自 Carson_Ho的系列文章，仅做回忆使用。

环境

image.png

classpath 'com.android.tools.build:gradle:3.1.4'
distributionUrl= https://services.gradle.org/distributions/gradle-4.4-all.zip
rxandroid2.1.0.jar
rxjava-2.2.3.jar

---

基础用法

image.png

测试数据初始化：

private void initData() {
        for (int i = 0; i < 15; i++) {
            TwiceBean bean2 = new TwiceBean(i);
            list.add(bean2);
        }
    }

共同点→：
这些东西好像都有delay延迟一定时间的方法
create():

private void RxTaskByCreate() {
        Observable.create(new ObservableOnSubscribe() {
            @Override
            public void subscribe(ObservableEmitter emitter) throws Exception {
                emitter.onNext(list.get(0));
                emitter.onNext(list.get(1));
                emitter.onNext(list.get(2));
                emitter.onComplete();
            }
        }).subscribe(new Observer() {
            @Override
            public void onSubscribe(Disposable disposable) {
                Log.i("mtg",disposable.isDisposed()+" onSubscribe:"+Thread.currentThread().getName());
            }
            @Override
            public void onNext(TwiceBean twiceBean) {
            Log.i("mtg",twiceBean.getAge()+":onNext:"+Thread.currentThread().getName());
            }
            @Override
            public void onError(Throwable throwable) {
                Log.i("mtg",throwable+":onError:"+Thread.currentThread().getName());
            }
            @Override
            public void onComplete() {
                Log.i("mtg","onComplete:"+Thread.currentThread().getName());
            }
        });
    }

结果：

2018-11-16 10:03:49.199 17624-17624/com.biabia.club.testrxandroid I/mtg: false onSubscribe:main
2018-11-16 10:03:49.199 17624-17624/com.biabia.club.testrxandroid I/mtg: 0:onNext:main
2018-11-16 10:03:49.199 17624-17624/com.biabia.club.testrxandroid I/mtg: 1:onNext:main
2018-11-16 10:03:49.199 17624-17624/com.biabia.club.testrxandroid I/mtg: 2:onNext:main
2018-11-16 10:03:49.199 17624-17624/com.biabia.club.testrxandroid I/mtg: onComplete:main

just():
作用
1.快速创建1个被观察者对象（Observable）
2.发送事件的特点：直接发送 传入的事件
注：最多只能发送10个事件

private void RxTaskByJust(){
        Observable.just(list.get(0),list.get(1)).subscribe(new Observer() {
            @Override
            public void onSubscribe(Disposable disposable) {
                Log.i("mtg",disposable.isDisposed()+" onSubscribe:"+Thread.currentThread().getName());
            }
            @Override
            public void onNext(TwiceBean twiceBean) {
              Log.i("mtg",twiceBean.getAge()+":onNext:"+Thread.currentThread().getName());
            }
            @Override
            public void onError(Throwable throwable) {
                Log.i("mtg",throwable+":onError:"+Thread.currentThread().getName());
            }
            @Override
            public void onComplete() {
                Log.i("mtg","onComplete:"+Thread.currentThread().getName());
            }
        });
    }

结果：

2018-11-16 10:34:41.807 20564-20564/com.biabia.club.testrxandroid I/mtg: false onSubscribe:main
2018-11-16 10:34:41.807 20564-20564/com.biabia.club.testrxandroid I/mtg: 0:onNext:main
2018-11-16 10:34:41.808 20564-20564/com.biabia.club.testrxandroid I/mtg: 1:onNext:main
2018-11-16 10:34:41.808 20564-20564/com.biabia.club.testrxandroid I/mtg: onComplete:main

fromArray():
作用:
快速创建1个被观察者对象（Observable）
发送事件的特点：直接发送 传入的整个数组数据
会将数组中的数据转换为Observable对象
注：可发送10个以上事件，可以看成对just的补充

private void RxTaskByFromArray(){
        Observable.fromArray(list).subscribe(new Observer>() {
            @Override
            public void onSubscribe(Disposable disposable) {
                Log.i("mtg",disposable.isDisposed()+" onSubscribe:"+Thread.currentThread().getName());
            }
            @Override
            public void onNext(ArrayList twiceBeans) {
                for (int i = 0; i < twiceBeans.size(); i++) {
                    Log.i("mtg","  \t"+twiceBeans.get(i)+" onNext:"+Thread.currentThread().getName());
                }
            }
            @Override
            public void onError(Throwable throwable) {
                Log.i("mtg",throwable+":onError:"+Thread.currentThread().getName());

            }
            @Override
            public void onComplete() {
                Log.i("mtg","onComplete:"+Thread.currentThread().getName());
            }
        });
    }

结果：

2018-11-16 10:38:57.937 21064-21064/com.biabia.club.testrxandroid I/mtg: false onSubscribe:main
2018-11-16 10:38:57.937 21064-21064/com.biabia.club.testrxandroid I/mtg:    com.biabia.club.testrxandroid.bean.TwiceBean@4b2f595 onNext:main
2018-11-16 10:38:57.937 21064-21064/com.biabia.club.testrxandroid I/mtg:    com.biabia.club.testrxandroid.bean.TwiceBean@d4426aa onNext:main
2018-11-16 10:38:57.937 21064-21064/com.biabia.club.testrxandroid I/mtg:    com.biabia.club.testrxandroid.bean.TwiceBean@b48729b onNext:main
2018-11-16 10:38:57.937 21064-21064/com.biabia.club.testrxandroid I/mtg:    com.biabia.club.testrxandroid.bean.TwiceBean@fa63638 onNext:main...
onComplete:main

fromIterable():
作用：
快速创建1个被观察者对象（Observable）
发送事件的特点：直接发送 传入的集合List元素数据
会将数组中的元素数据转换为Observable对象

private void RxTaskByFromIterval(){
        Observable.fromIterable(list).subscribe(new Observer() {
            @Override
            public void onSubscribe(Disposable disposable) {
                Log.i("mtg",disposable.isDisposed()+" onSubscribe:"+Thread.currentThread().getName());
            }
            @Override
            public void onNext(TwiceBean twiceBean) {
                Log.i("mtg",twiceBean.getAge()+" onNext:"+Thread.currentThread().getName());
            }
            @Override
            public void onError(Throwable throwable) {
                Log.i("mtg",throwable+":onError:"+Thread.currentThread().getName());
            }
            @Override
            public void onComplete() {
                Log.i("mtg","onComplete:"+Thread.currentThread().getName());
            }
        });
    }

结果：

2018-11-16 10:52:41.634 22351-22351/com.biabia.club.testrxandroid I/mtg: false onSubscribe:main
2018-11-16 10:52:41.634 22351-22351/com.biabia.club.testrxandroid I/mtg: 0 onNext:main
2018-11-16 10:52:41.634 22351-22351/com.biabia.club.testrxandroid I/mtg: 1 onNext:main
2018-11-16 10:52:41.634 22351-22351/com.biabia.club.testrxandroid I/mtg: 2 onNext:main...
2018-11-16 10:52:41.634 22351-22351/com.biabia.club.testrxandroid I/mtg: onComplete:main

never
被观察者对象什么都不会发送，观察者也什么都不接收，暂未知使用场景
empty()
注：该方法创建的被观察者对象仅发送Error事件,观察者接收后也只会直接调用onComplete（）
error()
注：该方法创建的被观察者对象仅发送Error事件,观察者接收后也只会直接调用onError（）

    private void RxTaskByFromError(){
        Observable.error(new RuntimeException("有错误啦")).subscribe(new Observer