classNode.addMethod(new AstBuilder().buildFromSpec {
            method('onCreate', ACC_PUBLIC, Void.TYPE) {
                parameters {
                    parameter 'savedInstanceState': Object.class
                }
                exceptions {}
                block {
                    owner.expression.addAll new AstBuilder().buildFromCode {
                        VariableExpression("super").onCreate(savedInstanceState)
                    }
                }
                annotations {}
            }
        })