如何從Android Facebook SDK 4.6.0獲取電子郵件ID？

Question

這是我在Facebook登錄后獲取用戶信息的代碼。 我正在嘗試從正在獲取名稱，ID的用戶那里獲取電子郵件ID，但是沒有獲取該電子郵件ID。我嘗試使用Login Button和Login Manager類給出相同的結果。 現在如何從響應中獲取電子郵件ID：

loginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
                @Override
                public void onSuccess(final LoginResult loginResult) {
                    new GraphRequest(AccessToken.getCurrentAccessToken(),
                            "/me", null , HttpMethod.GET,
                            new GraphRequest.Callback() {
                                public void onCompleted(
                                        GraphResponse response) {
                                         handle the result 

                                    if (response !=null  )
                                    {
                                        //GET USER INFORMATION
                                        Toast.makeText(getApplicationContext(),"Hello in JSON",Toast.LENGTH_LONG).show();
                                        JSONObject json = response.getJSONObject();
                                        //JSONArray jsona = response.getJSONArray();
                                        Log.i(TAG,"" +json);
                                       // Log.i(TAG,"" +json);
                                        String email = json.optString("email");
                                       // String email = json.optString("email");
                                        //Log.i("email", "" + email);
                                        Log.i(TAG,"" +email);
                                        String fullName = json.optString("name");
                                        String location = json.optString("location");
                                        String accessToken = loginResult.getAccessToken().getToken();
                                        String user_id = json.optString("id");
                                        Log.i(TAG,"" +json);
                                        Toast.makeText(getApplicationContext(),fullName,Toast.LENGTH_LONG).show();
                                        Toast.makeText(getApplicationContext(),email,Toast.LENGTH_LONG).show();
                                        Toast.makeText(getApplicationContext(),user_id,Toast.LENGTH_LONG).show();
                                        //int type = 1;
                                       // String lastUpdate = json.getString("updated_time");

                                      //  Log.i("email", "" + email);
                                      //  Log.i("Message", "HELLO");
                                        Log.i("Name", "" + fullName);
                                        Log.i("ID", "" + user_id);


                                    }
                                }

                            }).executeAsync();

謝謝..！！

Answer 1

LoginManager.getInstance().logInWithReadPermissions(WelcomeActivity1.this, (Arrays.asList("public_profile", "user_friends","user_birthday","user_about_me","email")));

String email;


LoginManager.getInstance().registerCallback(callbackManager,new FacebookCallback<LoginResult>() {
 @Override
  public void onSuccess(LoginResult loginResult) {
  Log.d("tag","FF fb onSuccess");
  GraphRequest request = GraphRequest.newMeRequest(loginResult.getAccessToken(),new GraphRequest.GraphJSONObjectCallback() {
    @Override
    public void onCompleted(JSONObject object,GraphResponse response) {
     try {
           String[] splited ;
           JSONObject obj =  object.getJSONObject("picture").getJSONObject("data");

                              if (object.has("email"))
                              {
                                 email =  object.getString("email");
                              }
                              else
                              {
                                  email = "";
                              }



                            } catch (JSONException e) {
                                // TODO Auto-generated catch block
                                e.printStackTrace();
                            }


                            }
                        });
                Bundle parameters = new Bundle();
                parameters.putString("fields", "id,name,link,birthday,picture,email,gender");
                request.setParameters(parameters);
                request.executeAsync();


            }

            @Override
            public void onCancel() {
                Log.d("tag","fb onCancel");
                 // App code
            }



@Override
            public void onError(FacebookException exception) {
                Log.d("tag","fb onError");
                 // App code   
            }
});

Answer 2

通過這種方式獲取Facebook登錄的所有內容...

    locationMangaer = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
    loginButton = (LoginButton)findViewById(R.id.login_button);
    loginButton.setReadPermissions(Arrays.asList("email", "user_photos", "public_profile", "user_friends"));

    callbackManager= CallbackManager.Factory.create();
    loginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
        @Override
        public void onSuccess(LoginResult loginResult) {
            GraphRequest request = GraphRequest.newMeRequest(
                    loginResult.getAccessToken(),
                    new GraphRequest.GraphJSONObjectCallback() {
                        @Override
                        public void onCompleted(
                                JSONObject object,
                                GraphResponse response) {
                            // Application code
                            Log.e("LoginActivity", response.toString() + "    " + object.toString());

                            try {
                                String name=object.getString("name");
                                String email=object.getString("email");
                                String id=object.getString("id");
                                String gender=object.getString("gender");




                                Log.e("LoginActivity", name + "    " + email + "   " + id + "   " + gender);
                            } catch (JSONException e) {
                                e.printStackTrace();
                            }

                        }
                    });



            Bundle parameters = new Bundle();
            parameters.putString("fields", "id,name,email,gender, birthday");
            request.setParameters(parameters);
            request.executeAsync();

        }

        @Override
        public void onCancel() {
            // App code
            Log.e("LOGIN Cancle", "LOGIN Cancle");
        }

        @Override
        public void onError(FacebookException exception) {
            // App code
            Log.e("LOGIN Cancle", exception.getMessage());
        }
    });

Answer 3

從Graph API v2.4開始，您需要指定要在查詢中返回的每個字段。

new GraphRequest(AccessToken.getCurrentAccessToken(),
  "/me", null , HttpMethod.GET,
  new GraphRequest.Callback() {
    ...

需要成為

new GraphRequest(AccessToken.getCurrentAccessToken(),
  "/me?fields=id,name,email", null , HttpMethod.GET,
  new GraphRequest.Callback() {
    ...

這是有據可查的，因此在SO上有許多類似的問題。 發表問題之前，請先參考文檔。

請記住，您需要適當的權限才能請求用戶詳細信息。 在這種情況下是email

看到：

• https://developers.facebook.com/docs/apps/changelog/#v2_4
• https://developers.facebook.com/docs/facebook-login/permissions/v2.5