在Android上将图片上传到Amazon S3时阻止线程 [英] Block thread while uploading picture to Amazon S3 on Android

问题描述

是否可以阻止当前线程并等待图片上传到S3?

Is there a way to block the current thread and wait while the picture is uploaded to S3?

我上传到S3的代码已经在Android服务中的doInBackground()方法中运行了(必须按特定顺序进行其他网络调用)，因此它不在主UI线程中.我只想知道什么时候上传完成，所以我可以取消通知并向用户显示所有内容都已上传/完成.

My code for uploading to the S3 is already running in a Android service in its doInBackground() method (with other network calls that have to be in specific order), so it's off the main UI thread. I just want to know when the uploading is done, so I can dismiss notification and show to user that everything is uploaded/done.

我正在使用SDK v2，如下所示:

I'm using SDK v2, like this:

TransferUtility transferUtility = new TransferUtility(s3, ctx);
TransferObserver obs = transferUtility.upload(
            S3BucketNamePhotoTEST,
            imageId + ".jpg",
            file, new ObjectMetadata());
obs.setTransferListener(new UploadListener(dbHandler, ctx, imageId));

其中UploadListener是实现TransferListener的类，在onStateChanged()方法中，我们可以检测到何时完成上传:

Where UploadListener is a class implementing TransferListener, where in onStateChanged() method we can detect when the upload is finished:

public void onStateChanged(int id, TransferState state) {
        if (state == TransferState.COMPLETED) {
        //do something here!
        }
}

那不是我所需要的，因为当onStateChange()回调触发时，我的服务调用将被长时间完成.

That's not what I need, because my service call will be long done when that onStateChange() callback fires.

但是查看SDK v1(现在已不推荐使用)，有一种方法可以阻止它，方法是:

But looking at SDK v1 (that's now mostly deprecated), there was a way to block it, with:

TransferManager tx = new TransferManager(
           credentialProviderChain.getCredentials());
Upload myUpload = tx.upload(myBucket, myFile.getName(), myFile);
...
// Or you can block the current thread and wait for your transfer to
// to complete. If the transfer fails, this method will throw an
// AmazonClientException or AmazonServiceException detailing the reason.
myUpload.waitForCompletion();

这个waitForCompletion()方法正是我所需要的，但是无法使用较新的API来实现.

This waitForCompletion() method is just what I need, but can't get to it with the newer API.

有解决方案吗?

推荐答案

最后，我在这里从Amazon开发人员那里得到了答案-> https://github.com/aws/aws-sdk-android/issues/91

Finally, I got the answer from Amazon developer here -> https://github.com/aws/aws-sdk-android/issues/91

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