andorid jar/库源码解析之RxJava2

目录:andorid jar/库源码解析 

RxJava2:

  作用:

    通过提供一种,观察者和订阅者的模式,的架构,来优化逻辑流程。适用于复杂和需要多数据转换和长流程。

  栗子:

   定义三个对象类

public class ResultInfo {
    public int code;
    public String msg;
    public String data;
}

public class UserInfo {
    public int status;
    public String name;
    public String head;
    public List<SkillInfo> skillInfoList;
}

public class SkillInfo {
    public String name;
    public int level;

    public SkillInfo(String name, int level){
        this.name = name;
        this.level = level;
    }
}

  一段逻辑测试代码:

    private ResultInfo login_http(String name, String pwd){
        ResultInfo resultInfo = new ResultInfo();
        resultInfo.code = 0;
        resultInfo.msg = "";

        Gson gson = new Gson();
        UserInfo userInfo = new UserInfo();
        userInfo.status = 1;
        userInfo.name = "";
        userInfo.head = "";
        userInfo.skillInfoList = new ArrayList<>();
        userInfo.skillInfoList.add(new SkillInfo("音乐", 10));
        userInfo.skillInfoList.add(new SkillInfo("美术", 6));
        userInfo.skillInfoList.add(new SkillInfo("体育", 9));
        resultInfo.data = gson.toJson(userInfo);

        return resultInfo;
    }

  版本1:(定义一个被观察的对象,和订阅者,设置他们使用的线程,最后通过调用 subscribe,使他们关联起来。且执行)

Observable<ResultInfo> observable = Observable.create(new ObservableOnSubscribe<ResultInfo>() {
            @Override
            public void subscribe(ObservableEmitter<ResultInfo> e) throws Exception {
                e.onNext(login_http(name, pwd));
            }
        });

        Consumer<ResultInfo> consumer = new Consumer<ResultInfo>() {
            @Override
            public void accept(ResultInfo resultInfo) throws Exception {
                if(resultInfo.code == 0){
                    Gson gson = new Gson();
                    UserInfo userInfo = gson.fromJson(resultInfo.data, UserInfo.class);
                    if(userInfo.status == 0){
                        // 注册
                        Toast.makeText(getBaseContext(), "注册", Toast.LENGTH_LONG).show();
                    } else if(userInfo.status == 1){
                        // 登录
                        Toast.makeText(getBaseContext(), "登录", Toast.LENGTH_LONG).show();
                    }
                }
            }
        };

        // subscribeOn() 指定的是发送事件的线程, observeOn() 指定的是接收事件的线程.
        observable.subscribeOn(Schedulers.newThread())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(consumer);

  版本2:(在版本1的基础上,通过在被观察者调用map处理,观察的数据,使数据只返回结果,而订阅者也是对结果进行判断,这里使用的数据类型发生了改变)。

Observable<Integer> observable = Observable.create(new ObservableOnSubscribe<ResultInfo>() {
            @Override
            public void subscribe(ObservableEmitter<ResultInfo> e) throws Exception {
                e.onNext(login_http(name, pwd));
            }
        }).map(new Function<ResultInfo, Integer>() {
            @Override
            public Integer apply(ResultInfo resultInfo) throws Exception {
                return resultInfo.code;
            }
        });

        Consumer<Integer> consumer = new Consumer<Integer>() {
            @Override
            public void accept(Integer code) throws Exception {
                if(code == 0){
                    Toast.makeText(getBaseContext(), "成功", Toast.LENGTH_LONG).show();
                } else{
                    Toast.makeText(getBaseContext(), "失败", Toast.LENGTH_LONG).show();
                }
            }
        };

        // subscribeOn() 指定的是发送事件的线程, observeOn() 指定的是接收事件的线程.
        observable.subscribeOn(Schedulers.newThread())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(consumer);

  版本3:(使用RxJava的优势,链式调用,来完成逻辑)

Observable.create(new ObservableOnSubscribe<ResultInfo>() {
            @Override
            public void subscribe(ObservableEmitter<ResultInfo> e) throws Exception {
                e.onNext(login_http(name, pwd));
            }
        }).map(new Function<ResultInfo, Integer>() {
            @Override
            public Integer apply(ResultInfo resultInfo) throws Exception {
                return resultInfo.code;
            }
        }).subscribeOn(Schedulers.newThread())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Consumer<Integer>() {
                    @Override
                    public void accept(Integer code) throws Exception {
                        if(code == 0){
                            Toast.makeText(getBaseContext(), "成功", Toast.LENGTH_LONG).show();
                        } else{
                            Toast.makeText(getBaseContext(), "失败", Toast.LENGTH_LONG).show();
                        }
                    }
                });

  版本4:(同时引入了flatMap来,处理集合数据,返回集合,每个数据都可以响应订阅者的accept方法,同时引入了filter对数据进行过滤,类似于C#中的,linq用法。)

Observable.create(new ObservableOnSubscribe<ResultInfo>() {
            @Override
            public void subscribe(ObservableEmitter<ResultInfo> e) throws Exception {
                e.onNext(login_http(name, pwd));
            }
        }).map(new Function<ResultInfo, UserInfo>() {
            @Override
            public UserInfo apply(ResultInfo resultInfo) throws Exception {
                UserInfo userInfo = new Gson().fromJson(resultInfo.data, UserInfo.class);

                return userInfo;
            }
        }).flatMap(new Function<UserInfo, Observable<SkillInfo>>() {
            @Override
            public Observable<SkillInfo> apply(UserInfo userInfo) throws Exception {
                return Observable.fromArray(userInfo.skillInfoList.toArray(new SkillInfo[userInfo.skillInfoList.size()]));
            }
        }).filter(new Predicate<SkillInfo>() {
            @Override
            public boolean test(SkillInfo skillInfo) throws Exception {
                return skillInfo.level > 8;
            }
        })
        .subscribeOn(Schedulers.newThread())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Consumer<SkillInfo>() {
                    @Override
                    public void accept(SkillInfo skillInfo) throws Exception {
                        Toast.makeText(getBaseContext(), skillInfo.name + " " + skillInfo.level, Toast.LENGTH_SHORT).show();
                    }
                });

        // 类似于linq , take, skip deng

  版本5:当然,RxJava的用法不仅仅这些,还有没有提到的,take,取几个成员,skip,跳过几个成员。等,这些用法和C#中的linq类似,详细很好理解

  // 代码,略

  源码解读:

  // 源码解读,后面再补上。

  源码:https://github.com/ReactiveX/RxJava

  引入:

implementation "io.reactivex.rxjava2:rxjava:2.0.7"
implementation "io.reactivex.rxjava2:rxandroid:2.0.1"
posted @ 2020-05-05 22:59  Supper_litt  阅读(92)  评论(0编辑  收藏
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