在Android上,总是通过设计在主Thread
上调用一些回调。以下ServiceConnection
:RxJava:如何从上游保留线程
private Completable dismissService() {
return Completable.fromEmitter(new Action1<CompletableEmitter>() {
@Override
public void call(final CompletableEmitter completableEmitter) {
final ServiceConnection conn = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
// here always main Thread...
unbindService(this);
completableEmitter.onCompleted();
}
@Override
public void onServiceDisconnected(ComponentName name) {
// no-op
}
};
completableEmitter.setCancellation(new AsyncEmitter.Cancellable() {
@Override
public void cancel() throws Exception {
unbindService(conn);
}
});
bindService(new Intent(MainActivity.this, MyService.class), conn, BIND_AUTO_CREATE);
}
});
}
不过,我想通过Completable返回dismissService()
发射其结果就什么Thread
它被调用的。我试图用一个newSingleThreadExecutor()
以下(哈克?)解决方案:
private Completable dismissServiceRetainingThread() {
return Single.fromCallable(new Callable<Thread>() {
@Override
public Thread call() throws Exception {
return Thread.currentThread();
}
}).flatMapCompletable(new Func1<Thread, Completable>() {
@Override
public Completable call(final Thread thread) {
return Completable.fromEmitter(new Action1<CompletableEmitter>() {
@Override
public void call(final CompletableEmitter completableEmitter) {
final ServiceConnection conn = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
// here always main Thread...
unbindService(this);
completableEmitter.onCompleted();
}
@Override
public void onServiceDisconnected(ComponentName name) {
// no-op
}
};
completableEmitter.setCancellation(new AsyncEmitter.Cancellable() {
@Override
public void cancel() throws Exception {
unbindService(conn);
}
});
bindService(new Intent(MainActivity.this, MyService.class), conn, BIND_AUTO_CREATE);
}
}).observeOn(Schedulers.from(
Executors.newSingleThreadExecutor(
new ThreadFactory() {
@Override
public Thread newThread(@NonNull Runnable runnable) {
return thread;
}
}
)));
}
});
}
但是,有以下IllegalThreadStateException
崩溃:
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.jenzz.rxjavathreadingtest, PID: 5307
java.lang.IllegalThreadStateException
at java.util.concurrent.ThreadPoolExecutor.addWorker(ThreadPoolExecutor.java:930)
at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1348)
at java.util.concurrent.Executors$DelegatedExecutorService.execute(Executors.java:591)
at rx.internal.schedulers.ExecutorScheduler$ExecutorSchedulerWorker.schedule(ExecutorScheduler.java:79)
at rx.Completable$28$1.onCompleted(Completable.java:1805)
at rx.internal.operators.CompletableFromEmitter$FromEmitter.onCompleted(CompletableFromEmitter.java:73)
at com.jenzz.rxjavathreadingtest.MainActivity$5$2$1.onServiceConnected(MainActivity.java:117)
任何想法如何,我可以跳回原始Thread
是以前用于上游,例如使用subscribeOn(Schedulers.io())
?
谢谢。这听起来很合理。我决定只是默认通知主线程并在JavaDoc中记录这种行为。调用者总是可以使用'.observeOn(Schedulers.io())',就像你建议直接切换到背景'Thread'一样。 – jenzz