title: How to rename a file?
body: <p>A quick question, how do i rename a file?</p>
  
  <pre><code>File to  = new File(f.getAbsolutePath(), etRenameStr.getText().toString() );
  f.renameTo(to);
  expl();
  </code></pre>
  
  <p>tried like that, but doesn't seem to work.</p>
  
  <p>Thanks!</p>