ParseFile.cancel()不起作用-文件不断下载 [英] ParseFile.cancel() not working - file keeps being downloaded

问题描述

我正在使用parse.com Android SDK来管理我的应用程序中的某些图像. cancel()是停止与parse.com服务器的事务的唯一方法吗?

I'm using parse.com Android SDK to manage some images in my app. Is cancel() the only way to stop a transaction with the parse.com server?

最小示例:

final ParseFile file = ... ;
file.getDataInBackground(new GetDataCallback() {

    //called when loading is done
    @Override
    public void done(byte[] bytes, ParseException e) {
        Log.e(TAG, String.valueOf(bytes == null));
    }

}, new ProgressCallback() {

    //called to notify progress   
    @Override
    public void done(Integer integer) {
        Log.e(TAG, String.valueOf(integer));
        if (integer > 50) {
            file.cancel();
        }
    }
});

我希望加载达到50％之后会停止，但是不会.我在这种情况下的登录信息将是:

I would expect that loading stops after the 50% is reached, but it does not. My log in this situation would be:

1
2
3
....
49
50
51
....
98
99
100
true

与调用cancel()的时间和不调用cancel()的时间唯一的区别是，如果取消了byte[]，则结果为null.但这确实是次要的，这里的要点是file一直在消耗带宽，而且与以后的下载重叠，从而降低了速度.

The only difference from times you call cancel() and times you don't, is that if you canceled the byte[] result is null. But that is really secondary, the point here is that file keeps consuming bandwidth and, moreover, overlaps with future downloads, slowing things down.

有什么方法可以真的停止ParseFile的加载吗?您是否看到任何解决方法，例如停止其线程?也许使用底层的螺栓框架?使用我自己的异步任务?

Is there any way to really stop ParseFile loading? Do you see any workaround, like stopping its thread? Maybe something using the underlying bolts framework? Using my own async task?

示例:

Example: continueWhile() method might be useful, but I can't figure out how to use it.

我想知道投票否决的原因，也许是普通头衔吗?那确实是我遇到的问题:ParseFile.cancel()无法正常工作.根据官方的 docs .

I would like to know the reason for the downvote, maybe the common title? That is really what I am experiencing: ParseFile.cancel() is not working. And it should, according to the official docs.

评论建议我应该简单地致电break.虽然我认为这行不通，但我可以澄清一下，我发布的代码只是提供上下文和问题的最小，简洁的工作示例.我不想从进度回调内部cancel()进行交易；我想从任何地方致电parseFile.cancel().我输入了进度回调来表明，尽管它应该停止，但它不会停止.

Comments suggest that I should simply call break. While I don't think it would work, I might clarify that the code I posted was just a minimal, concise working example providing both context and the issue. I don't want to cancel() the transaction from inside the progress callback; I want to call parseFile.cancel() from everywhere. I put in the progress callback to show that, while it should stop, it doesn't.

编辑，这是我真正想做的.我尝试了不同的方法，但这就是它.

Edit This is what I'm really trying to do. I have tried different ways but this is it.

ParseFile currentFile;
public void setFile(ParseFile file) {

    if (currentFile != null) {
        currentFile.cancel();
    }

    currentFile = file;
    currentFile.getDataInBackground(new GetDataCallback() {
        ...
    }, new ProgressCallback() {
        ... // logs
    });
}

使用这样的代码并说出要下载的两个大图像，事情就变成了这样:

With such code and say, two big images to download, things go like:

//calling setFile(file1)
1
2
3
...
20
21
22
//calling setFile(file2), thus also calling file1.cancel()
1
2
23 //file1 going on!
3
24
4
25
... //things get slower and this screws up progress bars and such.

推荐答案

这似乎是一个实际的错误，现已修复.我以前一直使用v1.9.2版本.今天我更新到v1.10.0，一切正常.

Looks like this was a real bug, now fixed. I used to stay with the v1.9.2 release; today I updated to v1.10.0 and everything works fine.

这篇关于ParseFile.cancel()不起作用-文件不断下载的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！