Titanium/Android access a file created in Titanium from native module

How do I access a file saved by Titanium from within a native module? In my code, I save a picture taken with the camera (Ti.Media) to a file. Then, I'm trying to read that same file from my module. I'm passing the nativePath to the module's method. But, I keep getting file not found errors in my module.

In the camera success callback, I have this code:

// earlier in the code
var tiexif = require('com.me.tiexif');

Ti.Media.showCamera({
    success: function(event) {
        console.log("TIEXIF: showCamera.success()");
        anImageView.image = event.media; // works
        if (Ti.Filesystem.hasStoragePermissions()) {
            console.log("TIEXIF: hasStoragePermissions");
            var file = Titanium.Filesystem.getFile(Ti.Filesystem.externalStorageDirectory, 'testphoto.jpg');
            console.log("TIEXIF: nativePath: " + file.nativePath);
            file.write(event.media);
            someUILabel.text = tiexif.getExifOrientation(file.nativePath);
        } else ...
    }, ...
}) 

I see this in the logs:

[INFO]  TIEXIF: showCamera.success()
[ERROR] File: fail readDirectory() errno=20
[ERROR] File: fail readDirectory() errno=13
[ERROR] File: fail readDirectory() errno=13
[ERROR] File: fail readDirectory() errno=13
[INFO]  TIEXIF: hasStoragePermissions
[INFO]  TIEXIF: nativePath: file:///storage/emulated/0/com.me.exiftest/testphoto.jpg
[WARN]  ExifInterface: Invalid image.
[WARN]  ExifInterface: java.io.FileNotFoundException: file:/storage/emulated/0/com.me.exiftest/testphoto.jpg: open failed: ENOENT (No such file or directory)

I have tried with externalStorageDirectory, applicationDataDirectory, tempDirectory, and applicationCacheDirectory all with the same results.

This is how I convert a image path to a file:

private String getPathToApplicationAsset(String assetName) {
    // The url for an application asset can be created by resolving the specified
    // path with the proxy context. This locates a resource relative to the 
    // application resources folder

    String result = resolveUrl(null, assetName);
    return result;
}

// ...
String imageSrc = options.getString("image"); 
// ...
String url = getPathToApplicationAsset(imageSrc);
TiBaseFile file = TiFileFactory.createTitaniumFile(new String[] { url }, false); 

I'm using it to open a file from the resource folder. Didn't try it with an external file yet.

Could you perhaps show your module code where you load the file?

Edit

To use a file for Exif information have a look at this project: https://github.com/freshheads/fh.imagefactory/blob/master/android/src/fh/imagefactory/ImagefactoryModule.java#L66 and especially the marked function. That will convert the path (strip elements)