This allows you to log in through your Facebook credentials. Here is the official link with the detailed demonstration of Facebook integration.
After That you can show/hide the facebook login button from your admin panel
Here below is link of official documentaiton of facebook login
You need Hash key and package name of your project and for this you need following commands
- Go to your project directory and open terminal
- Your need key store so apply command keytool -genkey -v -keystore my-release-key.keystore -alias alias_name -keyalg RSA -keysize 2048 -validity 10000
- For SHA-1 finger print key keytool -list -v -keystore my-release-key.keystore
- For Hash key keytool -exportcert -alias androiddebugkey -keystore ~/.android/my-release-key.keystore | openssl sha1 -binary | openssl base64
Note: You can use this hash key for other purpose i.e Google login.