Question

I have error in line:

    workbook.write();

When I try debug, i see massage: “Source not found.”

How it fix?

    private void exportExcel() throws IOException, WriteException{

    File file = new File(Environment.getExternalStorageDirectory() + "/backup.xls");

    WritableWorkbook workbook = Workbook.createWorkbook(file);
    workbook.createSheet("worksheet", 0);

    workbook.write();
    workbook.close();
    }

Thanks in advance

---

WTF my code above begin to work!!!

When I started, I using default jexcelapi. Afterwards I begin using alternative jexcelapi, but it also not work.

When I try your code with little changes – it work! Your code:

    private void exportExcel() throws WriteException, IOException{

    File sdCard = Environment.getExternalStorageDirectory();
    File dir = new File(sdCard + "/myFolder");

    //make them in case they're not there
    dir.mkdirs();

    //create a standard java.io.File object for the Workbook to use
    File wbfile = new File(dir, "backup.xls");

    WritableWorkbook workbook = null;

    try{
      workbook = Workbook.createWorkbook(wbfile);
      workbook.createSheet("worksheet", 0);

      workbook.write();
      workbook.close();
    } catch (IOException ex) {
        Log.e("Workbook Test", "Could not create " + wbfile.getPath(), ex);
    }
}

But when I try my code above, it also work.

Maybe Eclipse not instantly update using library?

Thank you very much!

P.S. Excuse me for my bad english.

Answer 1

Your code does not check that the external storage directory is actually available. You need to call getExternalStorageState and check the return value against the various MEDIA_* values defined in Environment. If the directory is not available, that may cause the problem.

The problem also may be that you are trying to write to the root of the external storage directory. From the docs:

Applications should not directly use this top-level directory, in order to avoid polluting the user’s root namespace. Any files that are private to the application should be placed in a directory returned by Context.getExternalFilesDir, which the system will take care of deleting if the application is uninstalled.

EDIT

Try this code:

File sdCard = Environment.getExternalStorageDirectory();
File dir = new File(sdCard + "/myFolder");

//make them in case they're not there
dir.mkdirs();

//create a standard java.io.File object for the Workbook to use
File wbfile = new File(dir, "backup.xls");

try{
  WritableWorkbook workbook = Workbook.createWorkbook(wbfile);
  workbook.createSheet("worksheet", 0);

  workbook.write();
  workbook.close();
} catch (IOException ex) {
  Log.e("Workbook Test", "Could not create " + wbfile.getPath(), ex);
}
return wb;

That should tell you more about what’s going on.

EDIT 2

After a little more research, I found another possible issue: JExcelApi uses a lot of resources when it is creating a file. One solution is to use a temp file. Add the following code:

WorkbookSettings wbSettings = new WorkbookSettings();
wbSettings.setUseTemporaryFileDuringWrite(true);

and inside the try block, change the line that creates the workbook:

WritableWorkbook workbook = Workbook.createWorkbook(wbfile, wbSettings);