使用FileDownloadSerialQueue下载，经常会出现下载不全的情况。

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FileDownloadSerialQueue queue = new FileDownloadSerialQueue();
FileDownloader.enableAvoidDropFrame();//避免掉帧
for (int i = 0; i < 10; i++) {
BaseDownloadTask baseDownloadTask = FileDownloader
.getImpl()
.create(Constant.URLS[i])
.setAutoRetryTimes(3)
.setCallbackProgressTimes(0)
.setPath(FileDownloadUtils.getDefaultSaveRootPath()+ "/" + i)
.setTag(i)
.addFinishListener(new BaseDownloadTask.FinishListener() {
@Override
public void over(BaseDownloadTask task) {
if(task.getStatus() == FileDownloadStatus.completed)
LogUtils.debugInfo("sgm", "====completed:" + (int) task.getTag());
}
});
queue.enqueue(baseDownloadTask);
}

代码是这样写的，经常出现只下载了5,6条完成，而没有下载10条数据，是不是线程阻塞了？

Start with the FileDownloadSerialQueue enqueue flow and the FileDownloader.getImpl().create entry point, then trace how the ten BaseDownloadTask instances are scheduled and completed. Reproduce the shown case with the FinishListener and determine why fewer than ten tasks reach the completed status; done means the cause and a verified correction are documented.

Written by the indexing model from the issue text.