Question

当我第一次通过Facebook登录应用时，我收到.hide-nav .owl-controls { display: none; }的个人资料

当我退出应用并再次启动时，它已经登录。所以我可以直接调用Profile.getCurrentProfile();返回null。

代码

Profile.getCurrentProfile();

Answer 1

这有两种情况：

首次登录时，请按my other answer。
要进行第二次登录，您需要刷新AccessToken，然后获取个人资料。刷新令牌代码可以在this answer中找到，但下面的代码包含它（为了简化）。

代码取自FB's dreadful documentation）。

您可以将此代码直接放入您的应用中，注释中显示＆＃34;案例1＆＃34;，只需调用您正常的FB登录。

private AccessTokenTracker mAccessTokenTracker;

private void loginToMyFbApp() {
    FacebookSdk.sdkInitialize(this);
    if (AccessToken.getCurrentAccessToken() != null) {
        mAccessTokenTracker = new AccessTokenTracker() {
            @Override
            protected void onCurrentAccessTokenChanged(AccessToken oldAccessToken, AccessToken currentAccessToken) {
                mAccessTokenTracker.stopTracking();
                if(currentAccessToken == null) {
                    //(the user has revoked your permissions -
                    //by going to his settings and deleted your app)
                    //do the simple login to FaceBook
                    //case 1
                }
                else {
                    //you've got the new access token now.
                    //AccessToken.getToken() could be same for both
                    //parameters but you should only use "currentAccessToken"
                    //case 2
                    fetchProfile();
                }
            }
        };
        mAccessTokenTracker.startTracking();
        AccessToken.refreshCurrentAccessTokenAsync();
    }
    else {
        //do the simple login to FaceBook
        //case 1
    }
}

private void fetchProfile() {
    GraphRequest request = GraphRequest.newMeRequest(
            AccessToken.getCurrentAccessToken(),
            new GraphRequest.GraphJSONObjectCallback() {
                @Override
                public void onCompleted(JSONObject object, GraphResponse response) {
                    // this is where you should have the profile
                    Log.v("fetched info", object.toString());
                }
            });
    Bundle parameters = new Bundle();
    parameters.putString("fields", "id,name,link"); //write the fields you need
    request.setParameters(parameters);
    request.executeAsync();
}

Answer 2

而不是访问Profile.getCurrentProfile（）

在onSuccess（）

中使用访问令牌并生成图形请求

（这对我有用）

这里的代码片段：

FacebookCallback<LoginResult> callback = new FacebookCallback<LoginResult>() {
    @Override
    public void onSuccess(LoginResult loginResult) {

        Log.v("profile track", (DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.SHORT).format(loginResult.getAccessToken().getExpires())));
        GraphRequest request = GraphRequest.newMeRequest(loginResult.getAccessToken(),
                new GraphRequest.GraphJSONObjectCallback() {
                    @Override
                    public void onCompleted(JSONObject object, GraphResponse response) {
                        try {

                            String name = object.getString("name");
                            String email = object.getString("email");
                            String id = object.getString("id");
                            Toast.makeText(Login.this, name + " " + " " + email + " " + id, Toast.LENGTH_SHORT).show();

                    /*write  your code  that is to be executed after successful login*/


                        } catch (JSONException ex) {
                            ex.printStackTrace();
                        }
                    }
                });
        Bundle parameters = new Bundle();
        parameters.putString("fields", "id,name,email,gender, birthday");
        request.setParameters(parameters);
        request.executeAsync();
    }

    @Override
    public void onCancel() {
    }

    @Override
    public void onError(FacebookException e) {
    }
};

Answer 3

获取个人资料详情后，请致电LoginManager.getInstance().logOut();。

Facebook Profile.getCurrentProfile（）在首次登录后始终返回null

3 个答案: