Facebook android SDK 3收到用户的电子邮件

Question

Here is my code for facebook me request.i want to get user email and other basic info.this code is work without any issue in emulator.but in real device email gives null value. id,fristname... comes with real values. how can i get email on real device?

    Request request = Request.newMeRequest(session,
            new Request.GraphUserCallback() {


                @Override
                public void onCompleted(GraphUser user, Response response) {

                    if (user != null) {



                        RequestParams params = new RequestParams();

                        params.put("email",(String) user.getProperty("email"));
                        params.put("password", "");
                        params.put("facebook_id", user.getId());
                        editor.putString("facebook_id", user.getId());

                        login(params,
                                (String) user.asMap().get("email"),
                                user.getId(), user.getFirstName(),
                                user.getLastName());

                    }
                }
            });
    Bundle params = new Bundle();
    params.putString("fields", "id,email,first_name,last_name");
    request.setParameters(params);
    request.executeAsync();

Answer 1

Instead of submitting a ME request, use Facebook's LoginButton, and add a hook to intercept the user info:

// Intercept the facebook user returned from login
facebookLoginButton.setUserInfoChangedCallback(new LoginButton.UserInfoChangedCallback() {

    @Override
    public void onUserInfoFetched(GraphUser user) {
        mFacebookUser = user;

        if (user != null) {
            LogUtils.LOGFB(TAG, "Got a Facebook user: " + user.getFirstName() +
                    " " + user.getLastName() + ", email: " + user.getProperty("email"));
        }
        else {
            LogUtils.LOGFB(TAG, "No Facebook user");
        }
    }
});

Then add an extra permission to get email:

facebookLoginButton.setReadPermissions(Arrays.asList(
        "email", "user_birthday", ...));