how to limit only one device login in your application code example

Example 1: only one device login limit android

Good practice would be let the user login from second device and logged out him from first device it would be better from user experience as well as will be easy to handle e.g

I logged in from DeviceId A (update DeviceId in db against the user) then I try to logged in from DeviceId B (again update DeviceId overriding previous DeviceId in db against the user)

Now If I make a request from DeviceId A, match the DeviceID in DB, it will return false. Send user back to login page.

Example 2: only one device login limit android

What you seem to need to do, is to get the device_ID and pair it with the account.That shouldn't be hard.

You get the device ID when your customer registers ,than at login you check the login credentials AND the device ID...

Here's pretty much all you need regarding the device ID (not the login,I trust you can handle it yourself)