11. Rxjava2 : 线程切换
2019-02-12 本文已影响58人
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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
未指定线程
- 如果未进行线程指定,则 Observable 和 Observer 的线程均为当前线程
new Thread(new Runnable() {
@Override
public void run() {
Observable.create(new ObservableOnSubscribe<Integer>() {
@Override
public void subscribe(ObservableEmitter<Integer> e) throws Exception {
Thread thread = Thread.currentThread();
String name = thread.getName();
Log.d(TAG,"Observable的线程:" + name);
e.onNext(1);
}
})
.subscribe(new Observer<Integer>() {
@Override
public void onSubscribe(Disposable d) {
}
@Override
public void onNext(Integer integer) {
Thread thread = Thread.currentThread();
String name = thread.getName();
Log.d(TAG,"subscribe的线程:" + name);
}
@Override
public void onError(Throwable e) {
}
@Override
public void onComplete() {
}
});
}
}).start();
log
02-12 10:34:06.553 17495-17545/... D/SplashActivity: Observable的线程:Thread-339
02-12 10:34:06.553 17495-17545/... D/SplashActivity: subscribe的线程:Thread-339
通过 subscribeOn 和 observeOn 指定线程
subscribeOn:
- 只有第一次指定的时候起作用
- 用于指定上游的线程(即Observable的线程)
- 作用的区间为: [Observable,直至有observeOn切换线程]
observeOn:
- 可以多次指定来切换线程
- 作用的区间为: [当前 observeOn 之后,下一次 observeOn 指定之前]
demo0
- 只指定了一次 subscribeOn,并且没有通过 observeOn 重新指定线程,因此,均运行在 subscribeOn 所指定的线程当中
Observable.create((ObservableOnSubscribe<Integer>) e -> {
Thread thread = Thread.currentThread();
String name = thread.getName();
Log.d(TAG, "Observable的线程:" + name);
e.onNext(1);
})
.subscribeOn(Schedulers.io())
.map(integer -> {
Thread thread = Thread.currentThread();
String name = thread.getName();
Log.d(TAG, "期间的所在的线程" + name);
return integer + 1;
})
.subscribe(new Observer<Integer>() {
@Override
public void onSubscribe(Disposable d) {
}
@Override
public void onNext(Integer integer) {
Thread thread = Thread.currentThread();
String name = thread.getName();
Log.d(TAG, "subscribe的线程:" + name);
}
@Override
public void onError(Throwable e) {
}
@Override
public void onComplete() {
}
});
log
02-12 10:45:46.033 19142-19191/... D/SplashActivity: Observable的线程:RxCachedThreadScheduler-2
02-12 10:45:46.033 19142-19191/... D/SplashActivity: 期间的所在的线程RxCachedThreadScheduler-2
02-12 10:45:46.033 19142-19191/... D/SplashActivity: subscribe的线程:RxCachedThreadScheduler-2
demo1
- subscribeOn多次指定并没有效果
Observable.create((ObservableOnSubscribe<Integer>) e -> {
Thread thread = Thread.currentThread();
String name = thread.getName();
Log.d(TAG, "Observable的线程:" + name);
e.onNext(1);
})
.subscribeOn(Schedulers.io())
.map(integer -> {
Thread thread = Thread.currentThread();
String name = thread.getName();
Log.d(TAG, "期间的所在的线程" + name);
return integer + 1;
})
.subscribeOn(AndroidSchedulers.mainThread())
.subscribe(new Observer<Integer>() {
@Override
public void onSubscribe(Disposable d) {
}
@Override
public void onNext(Integer integer) {
Thread thread = Thread.currentThread();
String name = thread.getName();
Log.d(TAG, "subscribe的线程:" + name);
}
@Override
public void onError(Throwable e) {
}
@Override
public void onComplete() {
}
});
log
02-12 10:55:24.323 19936-19988/... D/SplashActivity: Observable的线程:RxCachedThreadScheduler-2
02-12 10:55:24.333 19936-19988/... D/SplashActivity: 期间的所在的线程RxCachedThreadScheduler-2
02-12 10:55:24.333 19936-19988/... D/SplashActivity: subscribe的线程:RxCachedThreadScheduler-2
demo2
- subscribeOn 指定了 io 线程,observeOn 指定了主线程,observeOn 的作用区间在使用他之后
Observable.create((ObservableOnSubscribe<Integer>) e -> {
Thread thread = Thread.currentThread();
String name = thread.getName();
Log.d(TAG, "Observable的线程:" + name);
e.onNext(1);
})
.subscribeOn(Schedulers.io())
.map(integer -> {
Thread thread = Thread.currentThread();
String name = thread.getName();
Log.d(TAG, "期间的所在的线程" + name);
return integer + 1;
})
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Observer<Integer>() {
@Override
public void onSubscribe(Disposable d) {
}
@Override
public void onNext(Integer integer) {
Thread thread = Thread.currentThread();
String name = thread.getName();
Log.d(TAG, "subscribe的线程:" + name);
}
@Override
public void onError(Throwable e) {
}
@Override
public void onComplete() {
}
});
log
02-12 10:52:05.973 19615-19665/... D/SplashActivity: Observable的线程:RxCachedThreadScheduler-2
02-12 10:52:05.983 19615-19665/... D/SplashActivity: 期间的所在的线程RxCachedThreadScheduler-2
02-12 10:52:06.003 19615-19615/... D/SplashActivity: subscribe的线程:main
demo3
- 多次采用 observeOn 来切换线程
Observable.create((ObservableOnSubscribe<Integer>) e -> {
Thread thread = Thread.currentThread();
String name = thread.getName();
Log.d(TAG, "Observable的线程:" + name);
e.onNext(1);
})
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.map(integer -> {
Thread thread = Thread.currentThread();
String name = thread.getName();
Log.d(TAG, "期间的所在的线程" + name);
return integer + 1;
})
.observeOn(Schedulers.newThread())
.subscribe(new Observer<Integer>() {
@Override
public void onSubscribe(Disposable d) {
}
@Override
public void onNext(Integer integer) {
Thread thread = Thread.currentThread();
String name = thread.getName();
Log.d(TAG, "subscribe的线程:" + name);
}
@Override
public void onError(Throwable e) {
}
@Override
public void onComplete() {
}
});
log
02-12 10:58:20.293 20257-20306/... D/SplashActivity: Observable的线程:RxCachedThreadScheduler-2
02-12 10:58:20.313 20257-20257/... D/SplashActivity: 期间的所在的线程main
02-12 10:58:20.313 20257-20308/... D/SplashActivity: subscribe的线程:RxNewThreadScheduler-1
