Android Facebook sdk 4.2无法收到电子邮件

Question

我使用facebook sdk 4.2为我的Android应用程序.但我无法收到我的电子邮件,因此没有显示电子邮件的价值.但是,我可以获得其他价值,如姓名,链接,身份证,性别.stackoverflow有一些关于这个的话题,但他们使用的是较旧的sdk版本,这个类是不同的.请帮忙,这是我的代码.

FacebookSdk.sdkInitialize(this.getApplicationContext());
callbackManager = CallbackManager.Factory.create();

LoginManager.getInstance().registerCallback(callbackManager,
  new FacebookCallback < LoginResult > () {
   @Override
    public void onSuccess(LoginResult loginResult) {

      Toast.makeText(MainActivity.this, "SUCCESS", Toast.LENGTH_SHORT).show();

      GraphRequest request = GraphRequest.newMeRequest(
        loginResult.getAccessToken(),
        new GraphRequest.GraphJSONObjectCallback() {
        @Override
          public void onCompleted(
            JSONObject object,
            GraphResponse response) {
            // Application code 
            try {
              String id = object.getString("id");
              String name = object.getString("name");

              String email = object.getString("email"); //Get null value here

              String gender = object.getString("gender");

              Toast.makeText(MainActivity.this, "HI," + name + "Gender: " + gender, Toast.LENGTH_SHORT).show();

            } catch (JSONException e) {
              Toast.makeText(MainActivity.this, "Error", Toast.LENGTH_SHORT).show();
              e.printStackTrace(); 

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

    @Override
    public void onCancel() {
      // App code
    }

    @Override
    public void onError(FacebookException exception) {
      // App code   
    }
  });

@Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
   super.onActivityResult(requestCode, resultCode, data);
   callbackManager.onActivityResult(requestCode, resultCode, data);
 }

我的日志文件

06-05 13:47:56.207:W/System.err(9965):org.json.JSONException:没有电子邮件的值06-05 13:47:56.246:W/System.err(9965):at org.json .JSONObject.get(JSONObject.java:355)06-05 13:47:56.246:W/System.err(9965):at org.json.JSONObject.getString(JSONObject.java:515)06-05 13:47 :56.254:W/System.err(9965):at com.android.jobstreet.MainActivity $ 2 $ 1.onCompleted(MainActivity.java:242)06-05 13:47:56.254:W/System.err(9965):at com.facebook.GraphRequest $ 1.onCompleted(GraphRequest.java:295)06-05 13:47:56.254:W/System.err(9965):at com.facebook.GraphRequest $ 5.run(GraphRequest.java:1243)06 -05 13:47:56.254:W/System.err(9965):在android.os.Handler.handleCallback(Handler.java:733)06-05 13:47:56.254:W/System.err(9965):在android.os.Handler.dispatchMessage(Handler.java:95)06-05 13:47:56.254:W/System.err(9965):在android.os.Looper.loop(Looper.java:136)06- 05 13:47:56.254:W/System.err(9965):在android.app.ActivityThread.main(ActivityThread.java:5146)06-05 13:47:56.254:W/System.err(9965):at java.lang.reflect.Method.invokeNative(Native Method)06-05 13:47:56.254:W/System.err(9965):at java.lang.reflect.Method.invoke(Method.java:515)06 -05 13:47:56.254:W/System.err(9965):at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:732)06-05 13:47:56.254:W/System .err(9965):at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:566)06-05 13:47:56.254:W/System.err(9965):at dalvik.system.NativeStart. main(原生方法)

Answer 1

您必须设置以下权限

loginbtn.setReadPermissions("email");