How to root any Android device without any problem

As you guys know we need a pc to root the device. But today I am telling how to root any Android device without any pc. So let's start it
1) click this link and download kingo root apk:
    http://linkshrink.net/79hGIH
2)after download follow the steps and click root button
3) wait for few minutes. Your device may restart.
4) after restart your device is now rooted