How to save locally and retrieve files using Codename One and CN1 Filechooser?

Question

I have studied the Files, Storage and Networking instructions on the Codename One website. I am trying to

save files selected by the Codename One filechooser to the device (simulator, Android, iPhone)
retrieve the files saved locally in whatever device they got saved on.

Here is the code I used:

 final Button getFileChooser = new Button("Get file chooser");
    getFileChooser.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent evt) {

            if (FileChooser.isAvailable()) {
                FileChooser.showOpenDialog(".pdf, .jpg, .jpeg, .png", e2-> {
                    String file = (String)e2.getSource();
                    if (file == null) {
                        hi.add("No file was selected");
                        hi.revalidate();
                    } else {
                        String extension = null;
                        if (file.lastIndexOf(".") > 0) {
                            extension = file.substring(file.lastIndexOf(".")+1);
                            ToastBar.showMessage("1: " + file, FontImage.MATERIAL_CHECK);
                            rawFilename.setText("raw: " + file);
                            //java.util.List filepathParsed = StringUtil.tokenize(file, "[/.]");
                            StringBuilder hi = new StringBuilder(file);
                            if (file.startsWith("file://"))
                                hi.delete(0, 7);
                            int lastIndexPeriod = hi.toString().lastIndexOf(".");
                            Log.p(hi.toString());
                            String ext = hi.toString().substring(lastIndexPeriod);
                            String hmore = hi.toString().substring(0, lastIndexPeriod -1);

                            String hi2 = hmore +/* "/file" +*/ ext;/*hi;*/
                            Log.p("hi2 = " + hi2);
                            secondFilename.setText("2nd: " + hi2);
                            //secondFilename.setText((String)evt.getSource());
                            try {
                                saveFileToDevice(file, ext);
                            } catch (URISyntaxException e) {
                                e.getMessage();
                            }
                            //sendFileViaEmail(hi2, file);


                        } else {
                            ToastBar.showMessage("2: " + file + " " + extension, FontImage.MATERIAL_CHECK);
                        }
                    }
                    hi.revalidate();
                });
            }
        }
    });

 protected void saveFileToDevice(String hi, String ext) throws URISyntaxException{
    URI uri = new URI(hi);
    String path = uri.getPath();
    Log.p("uri path: " + uri.getPath() + " ; scheme: " + uri.getScheme());
    /*if (path.contains("..jpg")) {
        int indexLastPeriodBeforeExt = path.lastIndexOf(".");
        path = path.substring(0, indexLastPeriodBeforeExt) + path.substring(indexLastPeriodBeforeExt+ 1);
        Log.p("new path: " + path);

    }*/
    if (Display.getInstance().getPlatformName().equals("and"))
        path = "file://" +path;
    String home = FileSystemStorage.getInstance().getAppHomePath();
    char sep = FileSystemStorage.getInstance().getFileSystemSeparator();
    String userDir = home + sep + "myapp";
    /*if (hi.startsWith("file://")) {
        hi = hi.substring(7);
    }*/
    int index = hi.lastIndexOf("/");
    hi = hi.substring(index + 1);
    Log.p("hi after substring 7: " + hi);
    FileSystemStorage.getInstance().mkdir(userDir);
    String fPath = userDir + sep + hi ;
  /*  if (hi.contains("..jpg")) {
        int indexLastPeriodBeforeExt = hi.lastIndexOf(".");
        hi = hi.substring(0, indexLastPeriodBeforeExt) + hi.substring(indexLastPeriodBeforeExt+ 1);
        Log.p("new hi: " + hi);
    }*/

        Log.p("does it exist? " + FileSystemStorage.getInstance().exists(userDir));
        String imageFile = userDir + sep + hi;
         String[] roots = FileSystemStorage.getInstance().getRoots();
            if (roots.length > 0) {
                for (int i = 0; i < roots.length; i++)
                    Log.p("roots" + i + " " + roots[i]);
            }
            try {
                String[] files = FileSystemStorage.getInstance().listFiles(userDir);
                for (int i = 0; i < files.length; i++) {
                    Log.p(i + " " + files[i]);
                    //secondName = files[files.length-1];
                    Log.p("secondname: " + secondName);
                }
                sendFileViaEmail(imageFile, ".jpg");
            } catch (IOException e) {
                e.getMessage();
            }
        }

protected void sendFileViaEmail(String hi2, String file) {
    Message m = new Message("Test message");
    //m.getAttachments().put(file, "image/jpeg");
    m.setAttachment(hi2);
    m.setAttachmentMimeType(Message.MIME_IMAGE_JPG);
    //m.setMimeType(Message.MIME_IMAGE_JPG);
    //m.getAttachments().put(imageAttachmentUri, "image/png");
    Display.getInstance().sendMessage(new String[] {"myemail@example.com"}, "test message cn1", m);
}

I added the getFileChooser button to my Form after importing the cn1-filechooser library to my project and refreshed libs. The filechooser works -- I tried it on the simulator, Android device and iPhone.

My issue is here:

String file retrieves what looks like a URI. I tried to convert the URI to a File and when I run the following code to see that the files are stored I see them in my logs, although in a funny order, which I'm ok with.

 String[] files = FileSystemStorage.getInstance().listFiles(userDir);
            for (int i = 0; i < files.length; i++) {
                Log.p(i + " " + files[i]);
                //secondName = files[files.length-1];
                Log.p("secondname: " + secondName);
            }

How do retrieve a valid, uncorrupted version of this file from FileSystemStorage? Am I storing it wrong? Whenever I run the method to send the file via email, it opens Outlook (on my Desktop) but no files is attached? (I assume that the file is invalid/corrupted when trying to retrieve it from FileSytemStorage -- please help.) I hardcoded .jpg as MIME-type but only as a test; my goal is to be able to save/restore .pdf, .png, .jpg, and.jpeg files.

Thanks!

**EDIT: ** This seems to show that the file was actually saved to my app's storage. How do I stream the content of the file be copied/uploaded or emailed from my app?

How to save locally and retrieve files using Codename One and CN1 Filechooser?

Answers (1)

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