无法通过Facebook Android SDK获取电子邮件地址

Question

I tried to use below code to get my facebook email address via my app, but return value is null.

I don't know what the reason, but I can get email address using Graph API explorer . Is there anybody know what is wrong with this code?

@Override

public void onCreate(Bundle savedInstanceState) {

// Request email address

GraphRequest.newMeRequest(

   loginResult.getAccessToken(),new GraphRequest.GraphJSONObjectCallback() {

   public void onCompleted(JSONObject me, GraphResponse response) {

      Log.d("TEST", response.toString());
      if (response.getError() != null) {
        // handle error
      } else {
        Log.d("TEST", me.toString());
        String email = me.optString("email");
        String id = me.optString("id");
        Log.d("TEST", "Email:" + email);
     }
  }
}).executeAsync();

LoginButton authButton =(LoginButton) findViewById(R.id.login_button);

List<String> permissions = new ArrayList<>();

permissions.add("public_profile");

permissions.add("email");

authButton.setReadPermissions(permissions);

}

Answer 1

Finally I found the solution, using newMeRequest method fetches fields from a user object. In the case, I need email as an additional fields, so added “email” into fields parameter and request specific fields:

GraphRequest request = GraphRequest.newMeRequest( 

//...

});

Bundle parameters = new Bundle();

parameters.putString("fields", "id,name,email");

request.setParameters(parameters);

request.executeAsync();

Answer 2

Set the read permissions before you make the request and do it in the following way:

 GraphRequestAsyncTask request = GraphRequest.newMeRequest(AccessToken.getCurrentAccessToken(), new GraphRequest.GraphJSONObjectCallback() {
                    @Override
                    public void onCompleted(JSONObject user, GraphResponse response) {
                        final Profile profile = Profile.getCurrentProfile();

                        if ((user != null) && (profile != null)) {

                            accessToken = AccessToken.getCurrentAccessToken();

                            if (accessToken.getDeclinedPermissions().isEmpty()) {


                                try {
                                   String email = user.get("email").toString();
                                } catch (JSONException e) {
                                    e.printStackTrace();
                                }


                            }


                        }
                    }
                }).executeAsync();

Answer 3

You have to set permissions before the request.

Anywayt the email field may return null for two reasons:

1 - user didn't confirm the email address during the registration

2 - users could be signed up in Facebook using a phone number instead of email.

Documentation says:

Note, even if you request the email permission it is not guaranteed you will get an email address. For example, if someone signed up for Facebook with a phone number instead of an email address, the email field may be empty.