I list below the steps I took based upon your earlier post:
Download brouter_1_2.zip (current revision, 4.4.2015) from http://brouter.de/brouter/revisions.html
Extract the files
Copy BRouter.apk alone from C:\Users\(name)\Downloads\BRouter\brouter_1_2 to storage\emulated\0 on the 'phone
Locate the .apk file on the 'phone and install
Download the routing files (eg 5 files for uk) from the addresses below to C:\Users\(name)\Downloads\BRouter :http://brouter.de/brouter/segments3/W10_N55.rd5http://brouter.de/brouter/segments3/W5_N55.rd5http://brouter.de/brouter/segments3/W10_N50.rd5http://brouter.de/brouter/segments3/W5_N50.rd5http://brouter.de/brouter/segments3/E0_N50.rd5
Copy all downloaded *.rd5 files to storage\emulated\0\brouter\segments3
Go to Main menu>Settings>Navigation in Locus Map. Tap 'Navigation data source' and select 'BRouter'.
Below are my observations:
The link you provided to download BRouter prompted my browser to throw up a warning, 'Warning: Unsafe Website Blocked!'. http://brouter.de/brouter/revisions.html
throws up a warning, too, 'brouter_1_2.zip is not commonly downloaded and could be dangerous." I feel this could be offputting to some users.
Clicking the icon on the right-hand side of 'Navigation data source' produces an orange window, "Service 'BRouter' has no settings". GraphHopper displays the 'england.osm' file.
The screenshot of the navigation page attached shows BRouter is employed.
Selecting the same destination as I used for GraphHopper yesterday, BRouter navigates along the road rather than prioritising footpaths. GraphHopper selected the footpaths.
Storage\emulated\0\brouter\segments3\carsubset is empty.
The BRouter app icon displays 'Select Main Action' and 'BRouter App' displays five routing profiles when tapped.
A final point: there is delayed action in the appearance of folders both on the 'phone and in Windows Explorer that could cause bewilderment to some users.
I thank you again for assisting me.