lvl integration
<p>I read many tutorials but I don't understand how integrate lvl to my app. My situation: I've an app with some preferences "disabled". I done a check (using pm). So, using if/else I check if app key (downloadable from market) is installed or not. I don't understand how integrate lvl to protect my app. Is there a good tutorial or same advices?</p>

<pre><code>  PackageManager manager = getPackageManager();
            if (manager.checkSignatures("core.package.name", "key.package.name")
                == PackageManager.SIGNATURE_MATCH) {
                //full version
                isEnabled = true;
                getPreferenceManager().findPreference("keep").setEnabled(true);

            }
            else {
[...]
// free version
</code></pre>
