title: Sending email using standard gmail app without chooser
body: <p>I'm trying send email from my app using standard gmail app.
  But I get chooser all the time. 
  How can I open standard gmail app immediately without chooser? 
  I don't need a chooser with any application which can send email.
  I need only GMAIL.
  Thank you!
  Here is my code.</p>
  
  <pre><code>Intent intent = new Intent(Intent.ACTION_SEND);
  intent.setType("message/rfc822");
  intent.setClassName("com.google.android.gm", "com.google.android.gm.ConversationListActivity");
  intent.putExtra(Intent.EXTRA_EMAIL  , new String[]{"mymail@gmail.com"});
  intent.putExtra(Intent.EXTRA_SUBJECT, "Subject");
  intent.putExtra(Intent.EXTRA_TEXT   , "Text");
  try {
      startActivity(intent);
  } catch (android.content.ActivityNotFoundException ex) {
      Toast.makeText(getApplicationContext(), "There are no email clients installed.", Toast.LENGTH_SHORT).show();
  }
  </code></pre>