For example, when I am at home, with wify I download and install
"TeslaLED" - Torch Led Flashlight
"OsomAnd" - Topografic Map & gps.
"ES File Explorer File Manager" - File Manager
Then, After the apps are installed, I go in the wild far away in the mountains, in the cottage / refuge. There I have a friend with an android phone but there is no wify or internet acces, so I can take my external memory out and put it into his phone to install the apps and copy the maps, or transfer them over bluetooth.
How can I make this possible?