Fix gateway select

Author: wwqgtxx

tun.go

@@ -89,7 +89,9 @@ func (o *Options) Inet4GatewayAddr() netip.Addr {
 		return o.Inet4Gateway
 	}
 	if len(o.Inet4Address) > 0 {
-		if HasNextAddress(o.Inet4Address[0], 1) {
+		if runtime.GOOS == "android" {
+			// avoid "add route 0: network is unreachable"
+		} else if HasNextAddress(o.Inet4Address[0], 1) {
 			return o.Inet4Address[0].Addr().Next()
 		} else if runtime.GOOS != "linux" {
 			return o.Inet4Address[0].Addr()
@@ -103,7 +105,9 @@ func (o *Options) Inet6GatewayAddr() netip.Addr {
 		return o.Inet6Gateway
 	}
 	if len(o.Inet6Address) > 0 {
-		if HasNextAddress(o.Inet6Address[0], 1) {
+		if runtime.GOOS == "android" {
+			// avoid "add route 0: network is unreachable"
+		} else if HasNextAddress(o.Inet6Address[0], 1) {
 			return o.Inet6Address[0].Addr().Next()
 		} else if runtime.GOOS != "linux" {
 			return o.Inet6Address[0].Addr()