The following classes could not be instantiated: - com.facebook.widget.LoginButton

Question

I have been working on getting the facebook practice apps working and I cannot for the life of me figure out why I cannot reference the LoginButton found in the Facebook SDK

Answer 1

OPTION #1:

Sometimes, when a new resource is added, Eclipse doesn't compile correctly the new code (maybe a caching issue), causing this error.

Normally, simply restarting Eclipse is enough to fix the problem.

OPTION #2:

Sometimes, rendering custom views causes this exception. The only workaround I know is checking View.isInEditMode every time you try to use the getResources().

An example could be:

if (isInEditMode()) {
    //do something else, as getResources() is not valid.
} else {
    //you can use getResources()
    String mystring = getResources().getString(R.string.mystring);
}