public interface PhotoTaker {
    Uri capturePhoto();
}

public class AndroidPhotoTaker implements PhotoTaker {
    private Context _context;

    @Inject
    public AndroidPhotoTaker(Context context) {
        _context = context;
    }

    @Override
    public Uri capturePhoto() {
        Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        if (takePictureIntent.resolveActivity(_context.getPackageManager()) != null) {
            File photoFile = new File("some/path/to/a/file");

            Uri photoUri = FileProvider.getUriForFile(_context, _context.getApplicationContext().getPackageName() + ".provider", photoFile);
            takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoUri);
            _context.startActivity(takePictureIntent);
            return photoUri;
        }

        return null;
    }
}