How to activate Facebook login on your Website and Android Mobile Application
If you have already set up the Facebook Login on your website before then you can proceed to step 20 to set it up on your Android Mobile Application
Go to Facebook Developers Website and Login with your Facebook account normally then Select Add New App under My Apps
Set a name for the application (usually your brand name). This will be the name shown to your customers when they login using Facebook.
Under Facebook Login, press Set Up
Click on Android Icon to configure the login on your website
You’ll need the Google Play Package Name and the Key Hash ID, you can get both by going to your website dashboard and then hovering the mobile application tab then selecting app settings you’ll find the Google Play Package Name and when you scroll down you’ll find the Facebook Hash ID, copy and paste both back in your Facebook developer account
Press the single sign on to activate it and press save changes
Press “use this package name”
In your Facebook developer account, head to the settings tab then select Basic the copy your App ID
Head to your websites dashboard and hover Mobile Application then select App settings and scroll down till you reach the Facebook App ID section, paste the Facebook App ID and write your App name then press the save button to save your changes.