使Button可以从另一个布局中单击

Am relatively new to android, and this is the issue am having, i have a main layout which i would call layout A and another which i will call B for the purpose of this question, i included layout B in layout A with a include tag, layout B serves as a header in layout A, but layout B comes with a button, this button is not clickable in layout A, Please how can i make this button from layout B clickable.on the click of the button it is suppose to start another activity. thank you for your response. i will wait here for a while for any other questions you might have.Am relatively new to android, and this is the i