You may face the following error when integrating facebook sdk with Android :
java.lang.NullPointerException: Argument 'applicationId' cannot be null.
If you are getting the above error even though you specified the facebook applicationId in manifest file as follows:
<meta-data android:name="com.facebook.sdk.ApplicationId" android:value="123456785678" />
Reason:
Reason for the above error is due to the ApplicationId is mentioned as Integer , as we specified directly in manifest . But facebook SDK needs ApplicationId value as String. So if we pass ApplicationId as above, inside facebook SDK 'ClassCastException' occurs and considers ApplicationId value as null.
Solution:
Declare APP_ID value in strings.xml as follows:
<string name="APP_ID">123456785678</string>
And then refer this APP_ID as ApplicationId value in manifest file:
<meta-data android:name="com.facebook.sdk.ApplicationId" android:value="@string/APP_ID" />
Please share your comments on this , if it is helped ...
