InflateException: Couldn’t resolve menu item onClick handler

I found a solution that worked for me.
Usually the onClick attribute in a layout has the following method

public void methodname(View view) { 
    // actions
}

On a menu item (in this case Sherlock menu) it should follow the following signature:

public boolean methodname(MenuItem item) { 
    // actions
}

So, your problem was that your method returned void and not boolean.