title: createNewFile() throws an error
body: <p>In my android app I try to create a xml file on sdcard. I tried this : </p>
  
  <pre><code>public class XmlFileCreator extends Activity {
      @Override
      public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.main);
  
  
          System.out.println(Environment.getExternalStorageDirectory());
          // create a new file called "new.xml" in the SD card
          File newxmlfile = new File( Environment.getExternalStorageDirectory(),"new.xml");
          try {
              newxmlfile.createNewFile();
          } catch (IOException e) {
              Log.e("IOException", "exception in createNewFile() method");
          }
  
          FileOutputStream fileos = null;
          try {
              fileos = new FileOutputStream(newxmlfile);
          } catch (FileNotFoundException e) {
              Log.e("FileNotFoundException", "can't create FileOutputStream");
          }
          // we create a XmlSerializer in order to write xml data
          XmlSerializer serializer = Xml.newSerializer();
  
          try {
              // we set the FileOutputStream as output for the serializer, using
              // UTF-8 encoding
              serializer.setOutput(fileos, "UTF-8");
              // Write &lt;?xml declaration with encoding (if encoding not null) and
              // standalone flag (if standalone not null)
              serializer.startDocument(null, Boolean.valueOf(true));
              // set indentation option
              serializer.setFeature(
                      "http://xmlpull.org/v1/doc/features.html#indent-output",
                      true);
              // start a tag called "root"
              serializer.startTag(null, "root");
              // i indent code just to have a view similar to xml-tree
              serializer.startTag(null, "child1");
              serializer.endTag(null, "child1");
              serializer.startTag(null, "child2");
              // set an attribute called "attribute" with a "value" for &lt;child2&gt;
              serializer.attribute(null, "attribute", "value");
              serializer.endTag(null, "child2");
  
              serializer.startTag(null, "child3");
              // write some text inside &lt;child3&gt;
              serializer.text("some text inside child3");
              serializer.endTag(null, "child3");
  
              serializer.endTag(null, "root");
              serializer.endDocument();
              // write xml data into the FileOutputStream
              serializer.flush();
              // finally we close the file stream
              fileos.close();
  
              System.out.println("file has been created on SD card");         
          }
          catch(Exception e){
              Log.e("Exception","error occurred while creating xml file");
          }
      }
  }
  </code></pre>
  
  <p>but  in LogCat I get this :</p>
  
  <pre><code>08-23 11:19:56.776: ERROR/IOException(6333): exception in createNewFile() method
  08-23 11:19:56.776: ERROR/FileNotFoundException(6333): can't create FileOutputStream
  08-23 11:19:56.776: ERROR/Exception(6333): error occurred while creating xml file
  </code></pre>
  
  <p>Where is the problem? Why createNewFile() throws an IOException? Need some help, please...</p>