There’s probably many ways you could configure a similar setup to this, but here’s what worked for me.
This is for static IP on wired, and a different static IP on wireless, where the wireless is using WPA2. I also have two different routers one for wired and for one wireless. Replace static_ip_here with your required ip addresses, and x and y with the IP addresses for your routers.
auto lo iface lo inet loopback iface eth0 inet static address 192.168.1.static_ip_here netmask 255.255.255.0 gateway 192.168.1.x allow-hotplug wlan0 iface wlan0 inet static address 192.168.0.static_ip_here netmask 255.255.255.0 gateway 192.168.0.y wpa-ssid "your_ssid" wpa-psk "your passphrase" wpa-pairwise CCMP wpa-group CCMP