Java. readBytes from File

fileToByteArray

    private static byte[] readBytes(@NonNull File file) throws IOException {
      byte[] byteArray = null;
        InputStream inputStream = null;
        ByteArrayOutputStream outputStream = null;
        try {
            inputStream = new FileInputStream(file);
            outputStream = new ByteArrayOutputStream();
            byte[] b = new byte[1024 * 4];
            int bytesRead = 0;

            while ((bytesRead = inputStream.read(b)) != -1) {
                outputStream.write(b, 0, bytesRead);
            }

            byteArray = outputStream.toByteArray();
        } finally {
            try {
                if (inputStream != null) {
                    inputStream.close();
                }
                if (outputStream != null) {
                    outputStream.flush();
                    outputStream.close();
                }
            }catch (IOException e) {
              //log eroro here
            }
        }
        return byteArray;
    }