如何在android studio中使用弹出窗口按钮打开新的活动?

I have MainActivity.class n i have already created popup menu & there got few buttons what i need is i need to send user to new activity which i have created.my code is working buttons created on MainActivity.xml but when i gave popup menu button id its not launching my app. looking forward for support.I have MainActivity.class n i have already crea