带有DownloadManager的Android获取文件总大小 [英] Android with DownloadManager get total file size

问题描述

我研究了所有地方，但没有任何解决方案。我有一个片段代码，可以在Eclipse的调试模式下正常运行并获取文件的总大小。但是，当我运行该项目时，sizeOfDownloadingFile的值仅返回-1。

I have researched every where but no any solution. I have a snippet code that run and get the total file size normally while in debug mode of eclipse. But when i run the project the value of sizeOfDownloadingFile only return -1. Please help me, I compile with Android 22, thanks in advance.

 long id = downloadManager.enqueue(request);
            Cursor cursor = downloadManager.query(new DownloadManager.Query()
                    .setFilterById(id));
            if (!cursor.moveToFirst()) {
                Log.v("DownloadManagerService", "download list is empty");
                return;
            }
            int sizeOfDownloadingFile = 0;
            sizeOfDownloadingFile = cursor.getInt(cursor
                    .getColumnIndex(DownloadManager.COLUMN_TOTAL_SIZE_BYTES));
            Log.d("DownloadManagerService",
                    "File size of film " + mFilm.getmTitle() + " is "
                            + sizeOfDownloadingFile);

推荐答案

如果在主线程中调用代码，请尝试：

If you call your code in main thread try:

new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                check here size of your downloading file
            }
        },500);

在调试模式下，下载器可能会开始下载并且您具有有效值，但是如果您运行了应用正常下载器必须连接到服务器并下载文件，这有时比执行代码花费更多的时间。

When you are in debug mode downloader propably start download and you have a valid value, but if you ran app normaly downloader have to connect to server and doanload file, this sometimes take more time than execution of your code.

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