Android app not creating or editing a .csv file

I have been working on this for a few weeks now a little bit at a time. This is an android app i am developing for multiple versions of Samsung tablets. I need to create a file and add text to it. I cannot do either. I have 2 different methods to add text using different text writers to add text to a file. Here is my code:

public void addTextToFile(String text) {
    File logFile = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PODCASTS), "MyFile.csv");
    if (!logFile.exists()) {
        try {
            logFile.createNewFile();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    try {
        BufferedWriter buf = new BufferedWriter(new FileWriter(logFile, true));
        buf.append(text);
        buf.newLine();
        buf.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}
public void write(String data){
    OutputStream os;
    OutputStreamWriter osw;
    data += "\n";
    try {
        os = new FileOutputStream(file, true);
        osw = new OutputStreamWriter(os);
        osw.write(data);
        osw.flush();
        osw.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
}