String sFilename = "saved.txt";
				String sWriteFile = sEncodedText;

				try 
				{
					java.io.FileOutputStream fos = openFileOutput(sFilename, Context.MODE_WORLD_READABLE);
					fos.write(sWriteFile.getBytes());
					fos.close();
catch
{
...

Intent mailIntent = new Intent(Intent.ACTION_SEND);
mailIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
// ggf. Empfänger
mailIntent.putExtra(Intent.EXTRA_EMAIL,"e@mail.com");
// Betreff
mailIntent.putExtra(Intent.EXTRA_SUBJECT,"subject line");
// Body
mailIntent.putExtra(Intent.EXTRA_TEXT,"Body of email");
// Anhang
mailIntent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(new File("Filename")));

startActivity(Intent.createChooser(mailIntent ,"Send mail..."));

 public String readFromFile(String filename) throws IOException
	{
      BufferedReader brRead = new BufferedReader(new FileReader(filename));

      String sTmp = null;
      String sResult = "";
      try 
      {
   	   while((sTmp = brRead.readLine()) != null)
   	   {
   		   sResult = sResult + sTmp;
   	   }
      } 
      catch (IOException e) 
      {
   	   e.printStackTrace();
      }

      brRead.close();
      return sResult;
	}