Android Facebook sdk 4.2 无法获取电子邮件

Question

我正在为我的 android 应用程序使用 facebook sdk 4.2。但是我无法收到我的电子邮件，而且它没有显示电子邮件的值(value)。但是，我可以获得其他值，例如名称、链接、ID、性别。 stackoverflow 中有一些关于此的主题，但他们使用的是较旧的 sdk 版本，类不同。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: No value for email 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$5.run(GraphRequest.java:1243) 06-05 13:47:56.254: W/System.err(9965): at android.os.Handler.handleCallback(Handler.java:733) 06-05 13:47:56.254: W/System.err(9965): at android.os.Handler.dispatchMessage(Handler.java:95) 06-05 13:47:56.254: W/System.err(9965): at android.os.Looper.loop(Looper.java:136) 06-05 13:47:56.254: W/System.err(9965): at android.app.ActivityThread.main(ActivityThread.java:5146) 06-05 13:47:56.254: W/System.err(9965): at java.lang.reflect.Method.invokeNative(Native Method) 06-05 13:47:56.254: W/System.err(9965): at java.lang.reflect.Method.invoke(Method.java:515) 06-05 13:47:56.254: W/System.err(9965): at com.android.internal.os.ZygoteInit$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(Native Method)

Answer 1

您必须设置以下权限

loginbtn.setReadPermissions("email");