当用户按下主页时，将第一个屏幕设置为启动器上的当前项目？

I'm building a launcher/home screen replacement app and I've noticed all launchers allow the user to press home to go to the first screen of the launcher. So it's obviously possible to listen to the home key for home replacement apps but I haven't been able to figure out how.I'm building a launcher/home screen replacement