Bundle params = new Bundle();
params.putString("fields","birthday");
JSONObject jObject1 = new JSONObject(authenticatedFacebook.request("me/friends",params));
Now if you print the jobject1 you will get the all your friends birthday list..
The response will be in JSON format you have to get the value from it..
authenticatedFacebook is you object for Facebook..
For further clarification you check in this link.....
private static final String[] PERMISSIONS =
new String[] {"friends_birthday","read_stream", "offline_access"};
Make sure that you gave permission for accessing friends Birthday date..
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