使用 rxJava 通过 Glide 下载图像

Question

我需要通过给定的 url 下载图片（位图）。当我在我的项目中使用 Glide 来显示图片时，我想我也可以简单地使用他们的机制来下载图片。我需要在 RxJava 环境中使用它，我的问题是回调 onResourceReady() 没有被调用，当然方法 subscriber.onNext() 和 subscriber.onCompleted() 也没有被调用。

我收到 IllegalStateException（见下文）。我想对 Glide 的调用需要在主线程上完成，而不是在调用 get() 的 io 线程上完成。有办法实现吗？

这就是 id 所做的事情：

public Observable<Bitmap> get(final String url) {
    return Observable.create(new Observable.OnSubscribe<Bitmap>() {
        @Override
        public void call(final Subscriber<? super Bitmap> subscriber) {
            Glide
                    .with(context)
                    .asBitmap()
                    .load(url)
                    .into(new SimpleTarget<Bitmap>() {
                        @Override
                        public void onResourceReady(Bitmap resource, Transition<? super Bitmap> transition) {
                            // the method onResourceReady is not getting called
                            subscriber.onNext(resource);
                            subscriber.onCompleted();
                        }
                    });
        }
    });
}

java.lang.IllegalArgumentException: You 09-13 14:24:58.173 25581 25581 W System.err: 09-13 14:24:58.173 25581 25581 W System.err: 09-13 14:24:58.176 25581 25581 W System.err: 09-13 14:24:58.178 25581 25581 W System.err: 09-13 14:24:58.179 25581 25581 W System.err: 09-13 14:24:58.180 25581 25581 W System.err: 09-13 14:24:58.181 25581 25581 W System.err: 09-13 14:24:58.182 25581 25581 W System.err: 09-13 14:24:58.183 25581 25581 W System.err: 09-13 14:24:58.183 25581 25581 W System.err: 09-13 14:24:58.184 25581 25581 W System.err: 09-13 14:24:58.185 25581 25581 W System.err: 09-13 14:24:58.186 25581 25581 W System.err: 09-13 14:24:58.187 25581 25581 W System.err: 09-13 14:24:58.188 25581 25581 W System.err: 09-13 14:24:58.188 25581 25581 W System.err: 09-13 14:24:58.189 25581 25581 W System.err: 09-13 14:24:58.190 25581 25581 W System.err: 09-13 14:24:58.191 25581 25581 W System.err: 09-13 14:24:58.192 25581 25581 W System.err: must call this method on the main thread at com.bumptech.glide.util.Util.assertMainThread(Util.java:132) at com.bumptech.glide.RequestBuilder.into(RequestBuilder.java:350) at de.dumont.bob10.data.repository.image.ImageCloud.call(ImageCloud.java:53) at de.dumont.bob10.data.repository.image.ImageCloud.call(ImageCloud.java:44) at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:50) at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30) at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:50) at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30) at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:50) at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30) at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:50) at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30) at rx.Observable.unsafeSubscribe(Observable.java:8666) at rx.internal.operators.OperatorSwitchIfEmpty$ParentSubscriber.subscribeToAlternate(OperatorSwitchIfEmpty.java:79) at rx.internal.operators.OperatorSwitchIfEmpty$ParentSubscriber.onCompleted(OperatorSwitchIfEmpty.java:72) at rx.internal.operators.OperatorSwitchIfEmpty$AlternateSubscriber.onCompleted(OperatorSwitchIfEmpty.java:112) at rx.internal.operators.OperatorMerge$MergeSubscriber.emitLoop(OperatorMerge.java:650) at rx.internal.operators.OperatorMerge$MergeSubscriber.emit(OperatorMerge.java:562) at rx.internal.operators.OperatorMerge$MergeSubscriber.onCompleted(OperatorMerge.java:283) at rx.internal.operators.OperatorMap$MapSubscriber.onCompleted(OperatorMap.java:94)

Answer 1

我按如下方式修复了它。不幸的是，我没有取回位图，但目前对我来说还可以。

public Completable get(final String url) {
    return Completable.create(new CompletableOnSubscribe() {
        @Override
        public void subscribe(CompletableEmitter emitter) throws Exception {
            Glide
                    .with(context)
                    .load(url)
                    .downloadOnly(2000, 2000);
            emitter.onComplete();
        }
    });
}

使用 rxJava 通过 Glide 下载图像

Download Image via Glide with rxJava

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