I want to call one android application from another application

I have tried example on site http://www.anddev.org/install-run_applications_from_within_another_application-t6909.html

but it is not working for me It is giving Package parse error..

Please replay as soon as possible.

Consider there are two applications: Application1 and Application2

I want to call Application2 from Application1

I got some sample code to do this:

Intent i = new Intent(); i.setAction(android.content.Intent.ACTION_VIEW); i.setDataAndType(Uri.fromFile(fileName),"application/vnd.android.package-archive"); startActivity(i);

here fileName = "file://data/data/package_name/files/Application1.apk";

But I am getting Package Error and skipping file://data/data/package_name/files/Application1.apk