ContentResolver always returns null

Question

I'm trying to get the content type of a local file on my android device. My code is

File file = new File(uploadPath.replace("file://",""));
Uri uri = Uri.fromFile(file);
ContentResolver contentResolver = getApplicationContext().getContentResolver();
String type = contentResolver.getType(uri);

My upload path is file:///storage/emulated/0/DCIM/Camera/20141016_181148.jpg. However, I always get my type as null. Why is that??

Answer 1

If you're working with latest coding standards, there are a lot of changes in terms of how the storage is managed and we access it. To answer your question, you got to replace Uri uri = Uri.fromFile(file); with below code:

Java:

 Uri uri = FileProvider.getUriForFile(
                            context,
                            context.getPackageName() + ".provider",
                            file
                        );

Kotlin:

val uri = FileProvider.getUriForFile(
                                context,
                                context.packageName + ".provider",
                                file
                            )

Don't forget to check the official documentation on

• FileProvider API
• FileProvider.GetUriForFile()

I hope this helps!

Answer 2

The content resolver will return null if the uri scheme is not content://