Alter the postToTwitter function in your existing app.js file to match the following code by adding our new BH.tweet method call. If you already integrated the photo upload code from the previous recipe, then this source code snippet should appear in the xhr.onload() event handler:

BH.tweet(txtMessage.value + ' ' + this.responseText, 
  function(){
    alertDialog = Ti.UI.createAlertDialog({
      message:'Tweet posted!'
    });

    alertDialog.show();
});

Try running your application now in the simulator, and after authorization to Twitter (if necessary) your new tweet should get posted directly from your app! Go to http://twitter.com/yourusername to see the tweet posted to your timeline (as seen next). Clicking on the link should then load your uploaded photo!

This recipe is very simple, as all of the hard work in connecting to Twitter and uploading an image to our server has been taken care of. Therefore pushing our final message via Birdhouse to the Twitter API is actually very easy. Here we are calling the Birdhouse tweet() function, which accepts both a message (as a string) and a second parameter that acts as the event handler for the response from Twitter. You can also use this tweet function outside of posting an image or file to the server. Try posting a simple message tweet without the image and code and you'll see it works just as well!