You don't need to use tasker for this.
When you create a webpage on your Pi, just open your Android browser at the webpage, so if your Pi is connected to
192.168.0.1 open that address in your browser. You can control the GPIO pins via the Webiopi interface.
Follow the examples on the Wiki:
https://code.google.com/p/webiopi/wiki/Tutorial_BasisNow with Webiopi 0.71 it comes with weaved IoT so this means you can securely connect to your Pi through the web
interface from anywhere. I have an Android Tablet and also run Andois x86 on a laptop, the Webiopi interface works
the same on any device with a web browser. (Some browsers notably Internet Explorer may render the page differently
but you can still control the GPIO ports.)