DownloadManager -如何获取Content-length头部信息？

Question

我需要一些帮助:)。我有这样的代码：

    public void downloadFile(Uri uri, String title, String description, String subDir) {
    try {
        DownloadManager.Request request = new DownloadManager.Request(uri);
        request.setDescription(description).setTitle(title);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
            request.allowScanningByMediaScanner();
            //request.setVisibleInDownloadsUi(false);               request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_MOBILE | DownloadManager.Request.NETWORK_WIFI);
            request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
        }
        request.setDestinationInExternalFilesDir(DownloadDatabaseActivity.this, Environment.DIRECTORY_DOWNLOADS, subDir);

        this._bDatabaseMngr = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
        _bDatabaseMngrId = this._bDatabaseMngr.enqueue(request);
        /*** HERE IS MY QUESTION - BEGIN ***/
        Log.v(TAG, "File size (HTTP Content-length  header): " + HOW_TO_GET_CONTENT_LENGTH_HEADER_FROM_DOWNLOADMANAGER);
        if(HOW_TO_GET_CONTENT_LENGTH_HEADER_FROM_DOWNLOADMANAGER < getFreeSpace()) {
           // I'd like to handle it ;)
        }
        /*** HERE IS MY QUESTION - END ***/

    } catch (Exception e) {
        Log.e(TAG, e.getMessage());
    }
}

我想要实现的是HTTP报头中的Content-length值？有什么想法(最低api级别16)？

Answer 1

你可以检查你的下载id的DownloadManager状态和错误。

1. 为DownloadManager.ACTION_DOWNLOAD_COMPLETE
2. 设置broadcast receiver检查onReceive中的状态

新查询= DownloadManager.Query DownloadManager.Query()；

query.setFilterById(id)；Cursor =查询(downloadManager.query)；if(cursor.moveToFirst()){ int columnIndex = cursor.getColumnIndex(DownloadManager.COLUMN_STATUS)；int columnIndex= cursor.getInt(columnIndex)；int columnReason =query int columnIndex=cursor.getInt(ColumnIndex)；

}

您可以找到here的所有状态代码