@Override
public ClassLoader getClassLoader() {
+ // The documentation for this method states that it should return a class loader one can
+ // use to retrieve classes in this package. However, when called by LayoutInflater, we do
+ // not want the class loader to return app's custom views.
+ // This is so that the IDE can instantiate the custom views and also generate proper error
+ // messages in case of failure. This also enables the IDE to fallback to MockView in case
+ // there's an exception thrown when trying to inflate the custom view.
+ // To work around this issue, LayoutInflater is modified via LayoutLib Create tool to
+ // replace invocations of this method to a new method: getFrameworkClassLoader(). Also,
+ // the method is injected into Context. The implementation of getFrameworkClassLoader() is:
+ // "return getClass().getClassLoader();". This means that when LayoutInflater asks for
+ // the context ClassLoader, it gets only LayoutLib's ClassLoader which doesn't have
+ // access to the apps's custom views.
+ // This method can now return the right ClassLoader, which CustomViews can use to do the
+ // right thing.
if (mClassLoader == null) {
mClassLoader = new ClassLoader(getClass().getClassLoader()) {
@Override