Android New Image has strange numbers on the end of the file name

Question

I'm writing a camera2 app in android and when I try to save the image, something adds extra numbers on the end of the filename before the '.jpg'

I have a feeling it's because of the createTempFile() method, but here's my code:

File createImageFile() throws IOException {
    ++image_id;
    String timestamp = new SimpleDateFormat("yyyyMMdd").format(new Date());
    String subFolder = "";
    if(pref_session_unique_gallery.equals("yes")){
        if(event_name != null){
            subFolder = event_name;
        } else {
            subFolder = timestamp;
        }
    } else {
        subFolder = "_GEN";
    }
    if(event_name == null){
        imageFileName = "CPB_"+timestamp+"-"+image_id;
    } else {
        imageFileName = "CPB_"+event_name+"_"+timestamp+"-"+image_id;
    }
    imageStorageDirectory = Environment.getExternalStorageDirectory() + File.separator + "CPB" + File.separator + subFolder;
    imageFinalFileName = imageFileName;
    Toast.makeText(getApplicationContext(), imageStorageDirectory + "/" + imageFileName, Toast.LENGTH_LONG).show();
    File storageDirectory = new File(imageStorageDirectory);
    storageDirectory.mkdir();
    File image = File.createTempFile(imageFileName, ".jpg", storageDirectory);
    return image;
}

When I read the toast it gives me the correct path and filename that I am expecting, but when I look in my folder view, the picture has a lot of extra numbers on it.

For example, the picture name should be CPB_20160120-1.jpg but it currently reads CPB_20160120-1484291604.jpg If it makes a difference, the file was saved at 6:37 PM

two more examples:

should be: CPB_20160120-2.jpg is: CPB_20160120-22140921986.jpg

should be: CPB_20160120-3.jpg is: CPB_20160120-3-965716644.jpg

Not sure where those extra numbers are coming from when the file saves...

Answer 1

Those random numbers are explicitly generated by createTempFile(), as seen in the source code.

You probably don't want to use temporary files anyway, thus I'd recommend to create normal files:

File image = new File(storageDirectory, imageFileName + ".jpg");