It is strongly recommended that users be able to authenticate with Facebook when using Socialize so as to maximize the exposure and promotion of your app.
This provides significant benefits to both your application and your users including:
To add Facebook authentication, you’ll need a Facebook App ID. If you already have a Facebook app, you can skip this section.
If you do not already have a Facebook app just follow these simple steps:
First create a Facebook app. Go to https://developers.facebook.com/apps and create a new app:
Your newly created Facebook app will have an ID, which is the ID used in Socialize and can be found on your Facebook Developer page:
For example, this is the Facebook App page for Socialize:
Export the hash key from your Android keystore. All Android apps are required to be signed prior to running on a device and you will already have created a keystore while building your Android app.
Your keystore contains a public key which Facebook needs to identify your Android app.
On your development machine (where you are building your Android app), run the following command to generate a key hash:keytool -exportcert -alias androiddebugkey -keystore ~/.android/debug.keystore | openssl sha1 -binary | openssl base64
Make sure you use the correct key store to generate the hash. The example above (taken from the Facebook documentation) indicates use of the debug.keystore. You should use whichever keystore you chose when building the version of your app you are going to publish.
Next add your key hash to your Facebook app.
Paste your key into the “key hash” section of your Facebook app.
Ensure Android Native Deep Linking is DISABLED otherwise Facebook will bypass the Socialize SmartDownload process.
Generally it makes sense to add BOTH your debug and your release keys to Facebook to avoid problems during development and testing.