Titanium code to automatically update an APK

updateApk.js

var updateApk = function(apkUrl) {
  var downloader = require("com.mykingdom.downloader").createAsyncDownloader({
    filesToDownload: [{url : apkUrl}],
    outputDirectory: Ti.Filesystem.getFile("file:///mnt/sdcard/download"),
    enableNotification: true, notificationId: 1, notificationTitle: "Downloading new APK" // Optional
  });
  downloader.addEventListener("error", function(event){
    alert(event.error + " : While downloading file at (index 0 based) = " + event.currentIndex);
  });
  downloader.addEventListener("onload", function(event){
    Ti.API.info("Downloading new APK (" + event.progress + "%)");
  });
  downloader.addEventListener("cancel", function(event){
    Ti.API.info("Hmmm, looks like the download was cancelled.  Please try again.");
  });
  downloader.addEventListener("success", function(event){
    var downloadedFile = 'file:///mnt/sdcard/download/' + event.source.outputDirectory.directoryListing[0];
    Ti.API.info("Downloaded new APK to " + downloadedFile);
    var intent = Ti.Android.createIntent({action: Ti.Android.ACTION_VIEW, data: downloadedFile, type:'application/vnd.android.package-archive', packageName: 'com.android.packageinstaller' });
    intent.setFlags(Ti.Android.FLAG_ACTIVITY_NEW_TASK);
    Ti.Android.currentActivity.startActivity(intent);
  });
  downloader.startDownload();
};