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

Answer 1

According implementation of used method new file is created with extra random integer new File(tmpDirFile, prefix + Math.randomIntInternal() + suffix)

public static File createTempFile(String prefix, String suffix, File directory)
            throws IOException {
        // Force a prefix null check first
        if (prefix.length() < 3) {
            throw new IllegalArgumentException("prefix must be at least 3 characters");
        }
        if (suffix == null) {
            suffix = ".tmp";
        }
        File tmpDirFile = directory;
        if (tmpDirFile == null) {
            String tmpDir = System.getProperty("java.io.tmpdir", ".");
            tmpDirFile = new File(tmpDir);
        }
        File result;
        do {
            result = new File(tmpDirFile, prefix + Math.randomIntInternal() + suffix);
        } while (!result.createNewFile());
        return result;
    }

Answer 2

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");