download file to custom directory

问题

I am using the DownloadManager to download a file to my Android device. I can choose to download to the DCIM, Downloads, Picutures folder, etc using:

downloadRequest.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, "file.jpg");

This works. But I can only choose a limit set of folders to download to. I want to download to the root of my sdcard using /sdcard/

I tried:

downloadRequest.setDestinationUri(Uri.fromFile(new File("/sdcard/file.jpg")));

But this renders the following exception:

IllegalStateException: android invalid combination of destination: 4, path: /sdcard/file.jpg

How can I do this? I have all the required permissions set.

回答1:

Try like this.

downloadRequest.setDestinationInExternalPublicDir("/folderName",file.jpg);

This will create a folder in you external storage root and place the file.jpg in it.

回答2:

Fixed it by using

request.setDestinationInExternalPublicDir( "/APP_NAME/", FileNameGetter.getFileName(DATA..url) );

回答3:

As per the official documentation, you should only use either of the following variants, using one of the available Environment.DIRECTORY_* constants:

myRequest.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, "my_sub_folder/my_file.txt");

where the directory type (i.e. the first parameter) may not be null, or

myRequest.setDestinationInExternalFilesDir(myContext, null, "my_sub_folder/my_file.txt");
// or
// myRequest.setDestinationInExternalFilesDir(myContext, Environment.DIRECTORY_PICTURES, "my_sub_folder/my_picture.jpg");

where the directory type (i.e. the second parameter) may be null.

In any case, specifying a (sub)folder in the last parameter is optional.

来源：https://stackoverflow.com/questions/12971684/download-file-to-custom-directory