Program throws an exception when I try to create a file in Android

I'm trying to open a file and creat it if it does not exist. My code throws an exception that says file does not exist, but I thought with the rw option, it will creat it

// save dATA   
try {
    RandomAccessFile f=new RandomAccessFile("ted.dat", "rw");
    f.write(cGlobals.mBoard[0], 0, cGlobals.fBoardSize开发者_如何学JAVA* cGlobals.fBoardAmount);
    f.close();

} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();

---

I am sorry, but I think it should not work. Although Android's javadoc does not mention this here is what I saw in J2SE's javadoc:

 * @exception FileNotFoundException
 *            if the mode is <tt>"r"</tt> but the given string does not
 *            denote an existing regular file, or if the mode begins with
 *            <tt>"rw"</tt> but the given string does not denote an
 *            existing, writable regular file and a new regular file of
 *            that name cannot be created, or if some other error occurs
 *            while opening or creating the file

It means that if your mode includes "r" (i.e. it is "r" or "wr") the file should exist.

---

Yes, what you are trying to do should work. But are you writing where, exactly? Try to write in the SD Card, changing your path to "/sdcard/<yourCustomFolder>/ted.dat".

Also, I think you AndroidManifest.xml should have the following:

<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />