Fixing an Android Facebook Login RuntimeException

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In Android Studio , Facebook

Configure Facebook application ID, protocol scheme, and client token after a login result crashes the Android app.

Tapping Facebook Login crashed the app with java.lang.RuntimeException: Failure delivering result.

The project used an incompatible target SDK configuration and retained another app’s Facebook values. Configure the current SDK as required by the Facebook SDK version, then add the correct values to app/res/values/strings.xml:

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<string name="facebook_app_id">1234</string>
<string name="fb_login_protocol_scheme">fb1234</string>
<string name="facebook_client_token">56789</string>

The protocol scheme is fb followed by the app ID. Find the app ID on the Facebook app dashboard and the client token under App Settings → Advanced → Security.