Question

我写了一些代码来从服务器下载文件，同时更新进度条。下载代码在Schedulers.io线程中运行，更新ui代码在AndroidSchedulers.mainThread中运行。下载开始后我的程序终止了。这是我的代码：

    Observable
    .create(new Observable.OnSubscribe<String>() {
        @Override
        public void call(Subscriber<? super String> subscriber) {
            try {
                Response response = getResponse(url);
                if (response != null && response.isSuccessful()) {
                    InputStream is = response.body().byteStream();
                    subscriber.onNext(response.body().contentLength()); // init progress
                    File storedFile = Utils.getStoredFile(context, filePath);
                    OutputStream os = new FileOutputStream(storedFile);

                    byte[] buffer = new byte[1024];
                    int len;
                    while ((len = is.read(buffer)) != -1) {
                        // write data
                        os.write(buffer, 0, len);

                        count += len;
                        subscriber.onNext(count); // update progress
                    }

                    if (!subscriber.isUnsubscribed()) {
                        subscriber.onCompleted();
                    }

                    os.close();
                    is.close();
                    response.body().close();

            } catch (InterruptedException e) {
                subscriber.onError(e);
            }
        }
    })
    .subscribeOn(Schedulers.io()) // io and network operation  
    .observeOn(AndroidSchedulers.mainThread()) // UI view update operation  
    .subscribe(new Observer<Long>() {
        @Override
        public void onCompleted() {
            Log.d(TAG, "onCompleted -> " + Thread.currentThread().getName());
        }

        @Override
        public void onError(Throwable e) {
            Log.d(TAG, "onError -> " + e.getMessage());
        }

        @Override
        public void onNext(Long progress) {
            Log.d(TAG, "onNext -> " + Thread.currentThread().getName());
            Log.d(TAG, "onNext progress -> " + progress);
            // here update view in ui thread
        }
    }
    }

这是错误文字：

java.io.InterruptedIOException: thread interrupted
    at okio.Timeout.throwIfReached(Timeout.java:145)
    at okio.Okio$2.read(Okio.java:136)
    at okio.AsyncTimeout$2.read(AsyncTimeout.java:211)
    at okio.RealBufferedSource.read(RealBufferedSource.java:50)
    at com.squareup.okhttp.internal.http.HttpConnection$FixedLengthSource.read(HttpConnection.java:418)
    at okio.RealBufferedSource$1.read(RealBufferedSource.java:371)
    at java.io.InputStream.read(InputStream.java:163)
    at com.eldorado.rxfiledownloaddemo.presenter.Presenter$1.call(Presenter.java:74)
    at com.eldorado.rxfiledownloaddemo.presenter.Presenter$1.call(Presenter.java:52)
    at rx.Observable.unsafeSubscribe(Observable.java:8098)
    at rx.internal.operators.OperatorSubscribeOn$1$1.call(OperatorSubscribeOn.java:62)
    at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:55)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executor    at java.util.concurrent.FutureTask.run(FutureTask.java:23    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:153)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:267)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
    at java.lang.Thread.run(Thread.java:841)

Answer 1

observerOn适用于Observable.create，但是你在另一个线程中创建了一个新的observable。因此，您的管道永远不会将监视器提供给主线程。我认为你的代码对你想要达到的目标来说太复杂了。

以防万一，可以帮助您理解调度程序的概念

https://github.com/politrons/reactive/blob/master/src/test/java/rx/observables/scheduler/ObservableAsynchronous.java

RxJava：InterruptedIOException

1 个答案: