Using Facebook Android SDK (API-key)

I'm trying the Facebook Android SDK, but I don't开发者_StackOverflow社区 know where to insert my API-key.

The error I get when trying to log in using the Example-app is:

"Login Failed: android_key_not_configured"

where do I find this?

Did you read through this ? https://github.com/facebook/facebook-android-sdk

here is from one of the examples :

public class Example extends Activity {

    // Your Facebook Application ID must be set before running this example
    // See http://www.facebook.com/developers/createapp.php
    public static final String APP_ID = "175729095772478";