Android 无法从设备打印

我遵循了，并通过复制和粘贴示例代码创建了一个打印活动

我正试图从MediaStore打印图像，但当我到达打印屏幕时，按下“打印”按钮后什么也没有发生

这是我用来调用intent的代码

Intent printIntent = new Intent(GalleryActivity.this, PrintDialogActivity.class);

Uri fileUri = Uri.withAppendedPath(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, Long.toString(imageId));
Log.d(this, "File Uri:" + fileUri);
printIntent.setDataAndType(fileUri, "image/*");
startActivity(printIntent);

正在记录的Uri如下所示content://media/external/images/media/26848

按下打印按钮时的Logcat输出为

[INFO:CONSOLE(1)] "Uncaught TypeError: Object [object Object] has no method 'getType'", source: https://www.google.com/cloudprint/dialog.html (1)
[INFO:CONSOLE(280)] "Uncaught TypeError: Cannot call method 'k' of null", source: https://www.google.com/cloudprint/client/442365700-dialog_mobile.js (280)

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编辑：我已经在其他几个设备上进行了测试，但我没有得到上面的日志输出，因此可能与此无关。然而，每个设备的结果都是相同的；当我在webview中按下print按钮时，什么也没有发生。

在PrintDialogJavaScriptInterface类的方法中添加@JavascriptInterface

final class PrintDialogJavaScriptInterface {

    @JavascriptInterface
    public String getType() {
        return cloudPrintIntent.getType();
    }

    @JavascriptInterface
    public String getTitle() {
        return cloudPrintIntent.getExtras().getString("title");
    }

    @JavascriptInterface
    public String getContent() {
        try {
            ContentResolver contentResolver = getContentResolver();
            InputStream is = contentResolver.openInputStream(cloudPrintIntent.getData());
            ByteArrayOutputStream baos = new ByteArrayOutputStream();

            byte[] buffer = new byte[4096];
            int n = is.read(buffer);
            while (n >= 0) {
                baos.write(buffer, 0, n);
                n = is.read(buffer);
            }
            is.close();
            baos.flush();

            return Base64.encodeToString(baos.toByteArray(), Base64.DEFAULT);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return "";
    }

    @JavascriptInterface
    public String getEncoding() {
        return CONTENT_TRANSFER_ENCODING;
    }

    @JavascriptInterface
    public void onPostMessage(String message) {
        if (message.startsWith(CLOSE_POST_MESSAGE_NAME)) {
            finish();
        }
    }
}

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也许你必须把图像/png或jpg而不是图像/*