Rxjava学习笔记
2024-09-17 14:43:51
1、使用Observable.range(int start, int count)创建一个发射特定整数序列的Observable,第一个参数为起始值,第二个为发送的个数,如果为0则不发送,负数则抛异常。
import rx.Observable;
import rx.Subscriber; public class MyDemo { public static void main(String[] args) {
//创建发射源(被观察者)
Observable<Integer> observable = Observable.range(, );
//创建接收源(观察者)
Subscriber<Object> subscriber = new Subscriber<Object>() {
@Override
public void onStart() {
System.out.println("Subscriber onStart: ");
} @Override
public void onCompleted() {
System.out.println("Subscriber onCompleted: ");
} @Override
public void onError(Throwable e) {
System.out.println("Subscriber onError: " + e.toString());
} @Override
public void onNext(Object t) {
System.out.println("Subscriber onNext: " + t);
}
};
//订阅
observable.subscribe(subscriber);
}
}
2、Subscriber的简化
RxJava提供了Action0等一系列的类似的类,当我们不需要(或者不关心)Subscriber的全部方法(如只关心onNext方法),就可以使用Action类来替代Subscriber。
2.1、当我们并不关心OnComplete和OnError,可以使用 subscribe(onNextAction),我们只需要在onNext的时候做一些处理,这时候就可以使用Action1类:
import rx.Observable;
import rx.functions.Action1; public class MyDemo { public static void main(String[] args) {
Person person = new Person(, "js");
//创建发射源(被观察者)
Observable<Person> observable = Observable.just(person);
//订阅,创建接收源(观察者)
observable.subscribe(new Action1<Person>() { @Override
public void call(Person t) {
System.out.println("Action1 call:" + t.toString());
}
});
}
private static class Person{
private int age;
private String name; public Person(int age, String name) {
this.age = age;
this.name = name;
} public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
} @Override
public String toString() {
return "Person[age=" + age + ",name=" + name + "]" ;
}
}
}
2.2、subscribe方法还有两个重载方法,分别是:
- 两个参数: subscribe(onNextAction , onErrorAction)
- 三个参数: subscribe(onNextAction , onErrorAction ,onCompletedAction)
import rx.Observable;
import rx.functions.Action0;
import rx.functions.Action1; public class MyDemo { public static void main(String[] args) {
Person person = new Person(, "js");
//创建发射源(被观察者)
Observable<Person> observable = Observable.just(person);
//订阅,创建接收源(观察者)
Action1<Person> onNextAction = new Action1<Person>() {
@Override
public void call(Person t) {
System.out.println("Action1 call:" + t.toString());
}
};
Action1<Throwable> onErrorAction = new Action1<Throwable>() {
@Override
public void call(Throwable t) {
System.out.println("Action1 call:" + t.toString());
}
};
Action0 onCompletedAction = new Action0() {
@Override
public void call() {
System.out.println("Action0 call");
}
};
observable.subscribe(onNextAction, onErrorAction);
observable.subscribe(onNextAction, onErrorAction, onCompletedAction);
}
private static class Person{
private int age;
private String name; public Person(int age, String name) {
this.age = age;
this.name = name;
} public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
} @Override
public String toString() {
return "Person[age=" + age + ",name=" + name + "]" ;
}
}
}
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