CODEWITHSUNDEEP
javaandroidurifileinputstream
user3713569
user3713569

Reputation: 217

Putting a URI into a FileInputStream

For an assignment, we are required to be able to save a custom file type and then be able to read it back in again. I figured I could use the FileInputStream class so that I could easily just use myInStream.read() to get all of the information I need from the file. However, I've run into a problem with getting the file into the FileInputStream. I was able to get the URI, but it seems the method I used to get the URI makes a URI type that is incompatible with the File class. I have the following code in my onActivityResult() right before I start reading:

    Uri pickedFile = data.getData();
    File myFile = new File(pickedFile);
    FileInputStream inStream = new FileInputStream(myFile);

On the second line it says "Cannot resolve constructor 'File(android.net.Uri)'", so I'm assuming I must have to convert the URI to a different format, but I have no idea how to go about it. Any help would be much appreciated!

EDIT: For future reference the fixed code looks like this: Uri pickedFile = data.getData(); InputStream inStream = getContentResolver().openInputStream(pickedFile);

Upvotes: 4

Views: 9792

Answers (2)

Nikolai Ehrhardt
Nikolai Ehrhardt

Reputation: 726

I do it like this:

FileInputStream importdb = new FileInputStream(_context.getContentResolver().openFileDescriptor(uri, "r").getFileDescriptor());

Upvotes: 14

CommonsWare
CommonsWare

Reputation: 1006914

I'm assuming I must have to convert the URI to a different format

No. A Uri is an opaque handle to some content, such as https://stackoverflow.com/questions/42893406/putting-a-uri-into-a-fileinputstream. It is not a file.

You do not show where your Uri is coming from. My guess, given the named pickedFile, is that you are using ACTION_GET_CONTENT or ACTION_OPEN_DOCUMENT. In neither case is the user picking a file.

If my guess is correct as to where the Uri is coming from, that Uri will have either a file scheme or a content scheme. You can get an InputStream on either type of Uri the same way: call openInputStream() on a ContentResolver. You get a ContentResolver by calling getContentResolver() on a Context, such as your Activity or Service.

Upvotes: 5

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