Cannot Write On Micro SDCard On BlackBerry

Question

I am trying to save some files on micro SDCard. To check the availability of SDCard, I am using the following method;

private boolean isSdCardReady() {
    Enumeration e = FileSystemRegistry.listRoots();

    while (e.hasMoreElements()) {
        if (e.nextElement().toString().equalsIgnoreCase("sdcard/")) {    
            return true;
        }
    }
    return false;
}

Even if this method returns true, when I try to save files, it gives exception net.rim.device.api.io.file.FileIOException: File system is not ready.

What does this means? If SDCard is not available, then why its listed in FileSystemRegistry.listRoots()?

How can I make sure that SDCard is available for writing?

My development environment:

BlackBerry JDE Eclipse Plugin 1.5.0
BlackBerry OS 4.5
BlackBerry Bold with a 3G card

Interesting. Some special SD card. Can you create files from camera pp or other apps on your device? Is this card originally from this device? — Eugen Martynov, Jul 04 '12 at 08:47
@EugenMartynov: I think, we should keep removing these comments so that this post will remain clean. — Mudassir, Jul 04 '12 at 10:09
i think you are executing the code before your device really wake up. try to attach `SystemListener interface`. here how you can do this. [Write safe initialization code](http://supportforums.blackberry.com/t5/Java-Development/Write-safe-initialization-code/ta-p/444795) — BBdev, Jul 05 '12 at 04:49

Eugen Martynov · Answer 1 · 2012-07-04T09:49:13.807

4

Usually I had this error when I tried to access SD card on device restart. You have to postpone all operations in app until startup finished:

while (ApplicationManager.getApplicationManager().inStartup()) {
    try {
        Thread.sleep(500);
    } catch (InterruptedException ignored) {
    }
}

I remember one more possible cause mentioned here. You have to close all streams after using.

edited Jul 04 '12 at 09:49

answered Jul 04 '12 at 08:39

Eugen Martynov

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Thats really useful piece of code. But I am not accessing the SDCard at device startup. – Mudassir Jul 09 '12 at 04:39

score 3 · Accepted Answer · answered Jul 16 '12 at 09:42

Solved the problem. I was looking for "sdcard" while rootsEnum.nextElement().toString(); returns "SDCard". Yeah, its case sensitive. Now, instead of using hard-coded "SDCard", I've changed the above method to the following;

private static String getSdCardRootDir() {
    Enumeration rootsEnum = FileSystemRegistry.listRoots();

    while (rootsEnum.hasMoreElements()) {

        String rootDir = rootsEnum.nextElement().toString();

        if (rootDir.equalsIgnoreCase("sdcard/")) {
            return "file:///" + rootDir;
        }
    }

    return null;
}

Using this, I got the root directory in its system defined case.

Cannot Write On Micro SDCard On BlackBerry

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