从Base64 PDF到PDF文件-条码不显示

Question

我正在为Android应用程序编写Cordova插件。我有一个带有条形码的PDF，可以将其转换为base64。然后，我将该base64字符串转换回PDF，并将该文件保存到downloads文件夹中。 PDF创建良好，但是条形码显示为红色框/矩形，而不像原始PDF。当我通过电子邮件将PDF发送给自己并在Windows上的Adobe上打开时，条形码可以正常显示。

我不知道该怎么办。下面是代码片段：

 private void returnDataTest(String message, CallbackContext callbackContext){
    requestPermissionTest();
    try {
        //get the url page from the arguments array
         URL url = new URL("http://www.reliablesoftjm.com/samplefilesfortesting/DepartureReceiptBarcodeOnly.pdf");

        try {

            InputStream in = new BufferedInputStream(url.openStream());
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            byte[] buf = new byte[131072];
            int n = 0;
            while (-1 != (n = in.read(buf))) {
             out.write(buf, 0, n);
            }
            out.close();
            in.close();
            byte[] response = out.toByteArray();

            String filename = "tempreceipt.pdf";
            FileOutputStream outputStream;
            File path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);
            File file = new File(path, filename);
            outputStream = new FileOutputStream(file, false);
            outputStream.write(response);
            outputStream.flush();
            outputStream.close();


        } catch (Exception e) {
            e.printStackTrace();
        }
    } 
    catch (Exception e) {
        e.printStackTrace();
    }

}

这是原始pdf的屏幕截图： Screenshot of original PDF

base64的屏幕截图转换为pdf：enter image description here

这也是base64字符串，以防万一：

JVBERi0xLjQKJeLjz9MKNCAwIG9iago8PC9UeXBlL1hPYmplY3QvQ29sb3JTcGFjZVsvSW5kZXhlZC9EZXZpY2VSR0IgMjU1KAAAAIAAAACAAICAAAAAgIAAgACAgICAgPwEBAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAMDAwP8AAAD/AP//AAAA//8A/wD//////yldL1N1YnR5cGUvSW1hZ2UvQml0c1BlckNvbXBvbmVudCA4L1dpZHRoIDEvTGVuZ3RoIDkvSGVpZ2h0IDEvRmlsdGVyL0ZsYXRlRGVjb2RlL01hc2sgWzggOCBdPj5zdHJlYW0KeJzjAAAACQAJCmVuZHN0cmVhbQplbmRvYmoKNSAwIG9iago8PC9MZW5ndGggMTE1L0ZpbHRlci9GbGF0ZURlY29kZT4+c3RyZWFtCnicTY69CoAwDIT3PMWNOohNpT6AqIObkMFdqSgU6fsvpoo/BELIfZdLpEaoqmEdZKFOaCSLIS0ZRiv1miGByp7BFuIpy2VPaKSIh2IHhzmgnDyjPTDqIVXVkHRnPmALq7mJX8ilasht0E+Kd9KgE+HdIcIKZW5kc3RyZWFtCmVuZG9iagoxIDAgb2JqCjw8L0dyb3VwPDwvVHlwZS9Hcm91cC9DUy9EZXZpY2VSR0IvUy9UcmFuc3BhcmVuY3k+Pi9QYXJlbnQgNiAwIFIvQ29udGVudHMgNSAwIFIvVHlwZS9QYWdlL1Jlc291cmNlczw8L1hPYmplY3Q8PC9pbWcwIDQgMCBSL1hmMSAzIDAgUj4+L1Byb2NTZXQgWy9QREYgL1RleHQgL0ltYWdlQiAvSW1hZ2VDIC9JbWFnZUldL0NvbG9yU3BhY2U8PC9DUy9EZXZpY2VSR0I+Pi9Gb250PDwvRjEgMiAwIFI+Pj4+L01lZGlhQm94WzAgMCAxNDIgNjFdPj4KZW5kb2JqCjcgMCBvYmoKWzEgMCBSL1hZWiAwIDczIDBdCmVuZG9iagoyIDAgb2JqCjw8L0Jhc2VGb250L0hlbHZldGljYS9UeXBlL0ZvbnQvRW5jb2RpbmcvV2luQW5zaUVuY29kaW5nL1N1YnR5cGUvVHlwZTE+PgplbmRvYmoKMyAwIG9iago8PC9UeXBlL1hPYmplY3QvUmVzb3VyY2VzPDwvUHJvY1NldCBbL1BERiAvVGV4dCAvSW1hZ2VCIC9JbWFnZUMgL0ltYWdlSV0+Pi9TdWJ0eXBlL0Zvcm0vQkJveFswIDAgMTAyIDUwXS9NYXRyaXggWzEgMCAwIDEgMCAwXS9MZW5ndGggMTc0MC9Gb3JtVHlwZSAxL0ZpbHRlci9GbGF0ZURlY29kZT4+c3RyZWFtCnicvVdNrjQ1DNzPKfoErc6PneQKSCxYsUDsECD0PiRYPK5Ple0kPV+zQEJCT3pje2InrrITzx+v65Dr+IKP6/h4pSuvT6Hw6+v71++vdPz1ysc3WPQbvjq+ff3w43X89PoDf//J/d84/w9bxJp0pbMP/yLk67wuzQmG601+c+bfn7+85BzigVpIHy6l66yQ5Ws5gvz86stzLPu4re5fy8szpeWa8vrGxXDwJW/KdtftvgOn+36+5E1Z7vla7nkHzvcNfcmbst3zdt+A5DtOOT+U7d62+z58vh8+t4ey3cdyLztwedtwPJTlXsp234HLfUNf8qZs98153ajUO1qlP5TlXjfvdQeu9w1reijbfddq3Yev98NXeSjbfUMnGzq5Q1fHQ1nusqGTut3rvT/KQ9num3fZgeW+obSHstx1F61uVPSOll4PZbvX7Q5OaribOD3umWh9dx/hg1viWu4uTo/xUJZ7S9u9bPdy8/Alb8p2l+2u213vHvJQtnvf7vtc7X7e1h/Kvubycu91fePivN3yQ9nubbmPDd24Q+dL3pTlPjZ0Ywce9w1HeijbvWz3jcq4ozXKQ1nu3709RfaSfP3KbP2fXpci/KaetfPG0VOoSOfVoGdLB7brR2n4bPn45EWUB5QqMPr3ED95j+RQIAr+n93NFj3VY4oqyy5nKra8Q1xhFEpTC99ctG2lLXvmeu1uL3LoWfyOrBkyzwexuWhrxrR3+iLJ7HtpgcKYJiKwLHvjP4hIvfGsZk/p6JYLzubSRGSar8TldjRErhFGT1WIcP8k4INKro7xNQ4rKGIviFOKBYUEwBERefbAHptI2AFahTgTGVQK7INLEK/RPs7CndTsJuay7Hp2tfUURSMOlewcEsAr4lwEH/eNuwqrxOyKUjyzxYdYmea0o3AS7RfLpQSAOHQ+e4vaMdGQwr5u17Mq1+eFVGEZ3Kr0ExWM9wwwwebPXCGNPR0QhZBXZgmlEa1LDrxSyBIA0RuKBKQ1n3mCC1k1zIU04rAWpjDjzjKDSE83dhKtZhzcM7F0aiVSavbqoPVlrmcbXA7Y0RDNwyg7RSxMJmY5+Vl6cUDsiIETTo66cDNuJ3Zb80QBAEL2Y+NiKCUmHyiZXAkBw9B5ZI/JcmL32VbRzkQj2tzRmMuBBnkulkmpM0GTG0/vywFNW2GsNyCmMXuGu0YrQUTXohyK2y+Wbz722S0TYNdnJiY737jix+JbjExmicshLbpRxEFyNWIm3827mfbGopt8N0Z2vhGtON92LTnfnclPvq0DNewQAw6TnW8sT4tvZBx0N8fX6bYbzXm1WJNvRAvyIRZZhBsCTvgCxmBCY06UKDrdwmKa/ClP4ryqF5/z3ewqNnvzFhyBEpMwvk2MBE12vm355NvCOK/KS2Dyrd6AtAvzmXzzlEb3PLmlMXhPVSb7xWY89o7wipeL/BayDtEQMTKhzFwksdciLbFen/bBDDv3xUiZiSBuril2WXaZ62d5Q0ZBKTlneHXRtm057HiduXwMtyfrfT7UbIe4MGvcntpjeGWh2QONjZu+KzZdWsq13RS7rmtyRdkIfCUTL20TmUQY8ynJr/NPzroXbwbA7mLl7tNeSRvXEznxIGwbqz1HNGoSm+K185ocLILC+vbUyIYcN/ZIJjbQPsnELF7zIhOfwSXgX1TKGXMEJFkXkijP6XZlWU8mlSk5kyF2WXaZ62fhMowEY+LwOJNCxtxefTRxJispcSYrCz2YFI43QSS+KJs7a4o3ZXJX2VJbsYpyIm0Ocs7A0OJReXo363qZPxm19qDSxEllKMnsV15UKsF3Kg3SSWXlgOL26q9PiZJo4lzeyDMuO+8cS+FLKJEpfub0h3J1VwqnqToO/OKx4Yu8QbZBD4OHzA635IbNYySXIo5noww2G6F8mMLCQ8tjTba5w13lHlG9ctQ6s/GB4k+uOP/nPRkOxZo91cIfYPbmG60fVCqxQUoQ7da2uw7KiIrEb7GyJmEouu2dlcrTKUjOjirEjITdWK16K41imTS322SF2WmKNuktpS37XF9Z7RyEhBeUbWZnaV4ekHKblYKji4a9+JhiTygwsFEcF5+Lyg6f9sYBievtGR8eJ0YmtacmnlatPo/SjsiQahy+2yMAMzoN8WzqhGyzA65JF8X5ccXa2ZYjgQjS/A2FWNYbqtZdVsxMdcwi5xGnvfDUxZsIKXGs5Jebeda4WgUpX94vodiAQdJ4zNbXbvaeafXhwd45tevM7VafzX++sKBYgnaI+M0RVuXVxcU2t/UIYq1RLHh10TctYRdmMdfHibPBPQ//GT8P99/fPwspxAplbmRzdHJlYW0KZW5kb2JqCjYgMCBvYmoKPDwvSVRYVCgyLjEuNykvVHlwZS9QYWdlcy9Db3VudCAxL0tpZHNbMSAwIFJdPj4KZW5kb2JqCjggMCBvYmoKPDwvTmFtZXNbKEpSX1BBR0VfQU5DSE9SXzBfMSkgNyAwIFJdPj4KZW5kb2JqCjkgMCBvYmoKPDwvRGVzdHMgOCAwIFI+PgplbmRvYmoKMTAgMCBvYmoKPDwvTmFtZXMgOSAwIFIvVHlwZS9DYXRhbG9nL1ZpZXdlclByZWZlcmVuY2VzPDwvUHJpbnRTY2FsaW5nL0FwcERlZmF1bHQ+Pi9QYWdlcyA2IDAgUj4+CmVuZG9iagoxMSAwIG9iago8PC9DcmVhdG9yKEphc3BlclJlcG9ydHMgXChEZXBhcnR1cmVSZWNlaXB0XCkpL1Byb2R1Y2VyKGlUZXh0IDIuMS43IGJ5IDFUM1hUKS9Nb2REYXRlKEQ6MjAxODExMDkyMzM1MjMtMDUnMDAnKS9DcmVhdGlvbkRhdGUoRDoyMDE4MTEwOTIzMzUyMy0wNScwMCcpPj4KZW5kb2JqCnhyZWYKMCAxMgowMDAwMDAwMDAwIDY1NTM1IGYgCjAwMDAwMDExNTEgMDAwMDAgbiAKMDAwMDAwMTQ1MSAwMDAwMCBuIAowMDAwMDAxNTM5IDAwMDAwIG4gCjAwMDAwMDAwMTUgMDAwMDAgbiAKMDAwMDAwMDk2OSAwMDAwMCBuIAowMDAwMDAzNDgxIDAwMDAwIG4gCjAwMDAwMDE0MTcgMDAwMDAgbiAKMDAwMDAwMzU0NCAwMDAwMCBuIAowMDAwMDAzNTk4IDAwMDAwIG4gCjAwMDAwMDM2MzAgMDAwMDAgbiAKMDAwMDAwMzczNCAwMDAwMCBuIAp0cmFpbGVyCjw8L1Jvb3QgMTAgMCBSL0lEIFs8NjJlZjk5NmE2M2ZhMDlmNjE2N2FhN2E3ZjcyOGQyNDM+PDZiMGY2MDMxYWQxNTQ4NGQ1N2U1MzY5NmNjYjkzMmM4Pl0vSW5mbyAxMSAwIFIvU2l6ZSAxMj4+CnN0YXJ0eHJlZgozOTAxCiUlRU9GCg==