Question

i have a problem with my code that is supposed to write some data string to my sdcard. i use a class to do this:

public class CVS {
    private String path;
    private String filename;

    private File dir;
    private File file;

    private FileWriter fw;

    public CVS() {
        path = Environment.getExternalStorageDirectory().getAbsolutePath() + "/traffic/";
        filename = "data.cvs";
        file = new File(path, filename);    
        createDir();
    }

    private void createDir() {
        dir = new File(path);   
        if(!dir.exists()) {
            if(file.mkdirs() == false) {
                Log.d(Config.LOGTAG, "UHOH!!!!!!!!!!!!!!!!!!!!!!!!");
            }
        }
        else Log.d(Config.LOGTAG, "dir exists");
    }

    public void writeToFile(String data) {
        try {
            fw = new FileWriter(file);  
            fw.append(data); Log.d(Config.LOGTAG, "data saved to file...");
        }
        catch(Exception e) {
            Log.d(Config.LOGTAG, "file: " + e.getMessage());
        }
    }
}

this results ALWAYS in an exeption being caught in writeToFile(), saying “permission denied”. actually, i set permissions to WRITE_EXTERNAL_STORAGE in the manifest. so – what am i doing wrong!?

additional info: real device with sd card mounted. no emulator. android 2.2. if i create the dir myself, the problem wont go away 🙁

Answer 1

Either:

• Your manifest is wrong, or
• Your external storage is mounted on your development machine, or
• Your manual concatenation of your directory is wrong