How to check if class exists somewhere in package?

Question

I\'m currently dealing with a particular issue with my paid application. Internally it contains a licensing check. The app is patched by hackers by modifying the app apk/j

Answer 1

Here is what I used in Android - standard Java:

public boolean isClass(String className) {
    try  {
        Class.forName(className);
        return true;
    }  catch (ClassNotFoundException e) {
        return false;
    }
}

Implementation example:

if (isClass("android.app.ActionBar")) {
    Toast.makeText(getApplicationContext(), "YES", Toast.LENGTH_SHORT).show();
}