如何使用下载管理器获取下载的文件路径

Question

我可以使用下载管理器从服务器下载视频。但是，当我使用以下代码记录路径时。

 String path = Environment.getExternalStoragePublicDirectory(directory).getAbsolutePath() + subpath;
 Log.e("PATH", path);

我明白了

12-15 13:29:36.787 22807-22807/com.ezyagric.extension.android E/PATH: /storage/sdcard0/EZYAGRIC/Soil Testing.mp4。

现在这与手机上的路径不同

/storage/sdcard0/Android/data/com.ezyagric.extension.android/files/EZYAGRIC/Crop 保险.mp4

是什么带来了这种差异？如何才能以这种方式获得手机中的路径？

Answer 1

当你调用 --> downloadManager.enqueue(request) 方法之前设置他们的路径

request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS,"Google.gif");

File file = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS),"google.gif"); // Set Your File Name
if (file.exists()) {
    Bitmap myBitmap = BitmapFactory.decodeFile(file.getAbsolutePath());
    pro28_imageView.setImageBitmap(myBitmap);
}

Answer 2

代码 sn -p 下载默认下载目录中的文件。

DownloadManager.Request dmr = new DownloadManager.Request(Uri.parse(url));

// If you know file name
String fileName = "filename.xyz"; 

//Alternative if you don't know filename
String fileName = URLUtil.guessFileName(url, null,MimeTypeMap.getFileExtensionFromUrl(url));

dmr.setTitle(fileName);
dmr.setDescription("Some descrition about file"); //optional
dmr.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, fileName);
dmr.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
dmr.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI | DownloadManager.Request.NETWORK_MOBILE);
DownloadManager manager = (DownloadManager) mContext.getSystemService(Context.DOWNLOAD_SERVICE);
manager.enqueue(dmr);

注意对于mContext.getSystemService

• 活动=getSystemService();
• 片段= getActivity.getSystemService();
• 适配器=mContext.getSystemService(); //pass context in adapter

更新

因为 OP 要检查文件是否存在

File file = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS), fileName); 
if(file.exists()){//File Exists};

Answer 3

您应该尝试在下载文件夹中下载

        String url = "url you want to download";
        DownloadManager.Request request = new 
        DownloadManager.Request(Uri.parse(url));
        request.setDescription("Some descrition");
        request.setTitle("Some title");
        request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, "name-of-the-file.ext");

        // get download service and enqueue file
        DownloadManager manager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
        manager.enqueue(request);