1. RxJava2 : 什么是观察者模式
2. RxJava2 : 创建操作符(无关时间)
3. Rxjava2 : 创建操作符(有关时间)
4. Rxjava2 : 变换操作符
5. Rxjava2 : 判断操作符
6. Rxjava2 : 筛选操作符
7. Rxjava2 : 合并操作符
8. Rxjava2 : do操作符
9. Rxjava2 : error处理
10. Rxjava2 : 重试
11. Rxjava2 : 线程切换
| api | use |
|---|---|
| onErrorReturn | {{onErrorReturn}} |
| onErrorResumeNext | {{onErrorResumeNext}} |
| onExpectionResumeNext | {{onExpectionResumeNext} |
onErrorReturn
- onErrorReturn
1.采用指定的值来替换error,示例中采用的是666
2.onError仍然是终止的标识,采用其他值来替换,最后以onComplete作为终止
Observable.create((ObservableOnSubscribe) e -> {
e.onNext(1);
e.onError(new NullPointerException());
e.onNext(2);
}).onErrorReturn(throwable -> 666)
.subscribe(new Observer() {
@Override
public void onSubscribe(Disposable d) {
}
@Override
public void onNext(Integer integer) {
Log.d(TAG, "integer:" + integer);
}
@Override
public void onError(Throwable e) {
Log.d(TAG, e.getMessage());
}
@Override
public void onComplete() {
Log.d(TAG, "onComplete");
}
});
log
02-03 15:18:02.628 1869-1869/... D/aaabccc: integer:1
02-03 15:18:02.628 1869-1869/... D/aaabccc: integer:666
02-03 15:18:02.638 1869-1869/... D/aaabccc: onComplete
onErrorResumeNext
- onErrorResumeNext
1.和onErrorReturn类似
2.区别:
onErrorReturn: 以值来替换
onErrorResumeNext : 以Observable来替换
Observable.create((ObservableOnSubscribe) e -> {
e.onNext(1);
e.onError(new Error());
e.onNext(2);
}).onErrorResumeNext(throwable -> {
return Observable.just(666,777);
})
.subscribe(new Observer() {
@Override
public void onSubscribe(Disposable d) {
}
@Override
public void onNext(Integer integer) {
Log.d(TAG, "integer:" + integer);
}
@Override
public void onError(Throwable e) {
Log.d(TAG, e.getMessage());
}
@Override
public void onComplete() {
Log.d(TAG, "onComplete");
}
});
}
log
02-03 15:47:35.608 5890-5890/... D/aaabccc: integer:1
02-03 15:47:35.608 5890-5890/... D/aaabccc: integer:666
02-03 15:47:35.608 5890-5890/... D/aaabccc: integer:777
02-03 15:47:35.608 5890-5890/... D/aaabccc: onComplete
onExpectionResumeNext
- onExpectionResumeNext
1.与onErrorReturn和onErrorResumeNext的区别在于,并不是替换掉了error,而是采用重新发送的方式,将原来发送error的位置发送指定的元素
2.throwable的子类
exception:
会起作用,在发生exception的位置发送指定的元素
error:
并不会起作用,会和正常方式一样,在observer的onError中处理
// throwable: Exception
Observable.create((ObservableOnSubscribe) e -> {
e.onNext(1);
e.onError(new Exception());
e.onNext(2);
}).onExceptionResumeNext(new Observable() {
@Override
protected void subscribeActual(Observer observer) {
observer.onNext(666);
observer.onNext(333);
}
})
.subscribe(new Observer() {
@Override
public void onSubscribe(Disposable d) {
}
@Override
public void onNext(Integer integer) {
Log.d(TAG, "integer:" + integer);
}
@Override
public void onError(Throwable e) {
Log.d(TAG, "error");
}
@Override
public void onComplete() {
Log.d(TAG, "onComplete");
}
});
log
02-03 15:47:35.608 5890-5890/... D/aaabccc: integer:1
02-03 15:47:35.608 5890-5890/... D/aaabccc: integer:666
02-03 15:47:35.608 5890-5890/... D/aaabccc: integer:777
02-03 15:47:35.608 5890-5890/... D/aaabccc: onComplete
//throwable : error
Observable.create((ObservableOnSubscribe) e -> {
e.onNext(1);
e.onError(new Error());
e.onNext(2);
}).onExceptionResumeNext(new Observable() {
@Override
protected void subscribeActual(Observer observer) {
observer.onNext(666);
observer.onNext(333);
}
})
.subscribe(new Observer() {
@Override
public void onSubscribe(Disposable d) {
}
@Override
public void onNext(Integer integer) {
Log.d(TAG, "integer:" + integer);
}
@Override
public void onError(Throwable e) {
Log.d(TAG, "error");
}
@Override
public void onComplete() {
Log.d(TAG, "onComplete");
});
log
02-03 16:24:05.658 11979-11979/... D/aaabccc: integer:1
02-03 16:24:05.658 11979-11979/... D/aaabccc: error