License Check question in Android [duplicate]

This question already has answers here: Closed 11 years ago.

开发者_StackOverflow中文版Possible Duplicate:

Android Licensing Problem

I am using the License service which I got from here (http://developer.android.com/guide/publishing/licensing.html). However, many hackers can still crack this, I wonder if I put the License code in all of my activities, can the hackers still hack my app? I am also interested to know how they disable the License checkers, thanks in advance!

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Disabling can be done only if the device has been rooted by using the terminal anyone can disable any activity of any application :).