Question

我已经用4.0 sdk实现了facebook登录，在成功登录后，我获得了一个加号令牌并继续主要活动，一切都很完美。但是当我关闭并重新打开应用程序时，accesstoken为null。我不知道如何解决它

这是我的代码：

 @Override
protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    FacebookSdk.sdkInitialize(getApplicationContext());

    if (BuildConfig.DEBUG) {
        FacebookSdk.setIsDebugEnabled(true);
        FacebookSdk.addLoggingBehavior(LoggingBehavior.INCLUDE_ACCESS_TOKENS);
    }


    setContentView(R.layout.activity_login_fb);



    prefs =  getSharedPreferences("config", Context.MODE_PRIVATE);
    editor = prefs.edit();

    token_session = "";


    callbackManager = CallbackManager.Factory.create();
    LoginManager.getInstance().logOut();

    accessTokenTracker = new AccessTokenTracker() {
        @Override
        protected void onCurrentAccessTokenChanged(AccessToken oldAccessToken, AccessToken newAccessToken) {
            AccessToken.setCurrentAccessToken(newAccessToken);

            updateWithToken(newAccessToken);
        }
    };

    accessToken = AccessToken.getCurrentAccessToken();

    updateWithToken(AccessToken.getCurrentAccessToken());

    accessTokenTracker.startTracking();
    startApp();

}
private void startApp(){
    loginButton = (LoginButton)findViewById(R.id.login_button);

    loginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
        @Override
        public void onSuccess(LoginResult loginResult) {
            AccessToken.setCurrentAccessToken(loginResult.getAccessToken());

            sendLoginToBackend();
            //Log.i("Facebook Login", loginResult.getAccessToken().getToken());

        }

        @Override
        public void onCancel() {
            //Log.i("Facebook Login", "Login Cancel");
        }

        @Override
        public void onError(FacebookException e) {
            Log.e("Facebook Login", "Login Error");
        }
    });


}
private void updateWithToken(AccessToken currentAccessToken) {

    if (currentAccessToken == null){
        Log.i("Facebook Access Token ","null");
    }else{
        Log.i("Facebook Access Token ","not null");
    }

    if (currentAccessToken != null) {

        if (prefs.getBoolean("datos_completos",false)){
            new Handler().postDelayed(new Runnable() {
               // THIS WILL BE REMOVED
                @Override
                public void run() {
                    //Intent i = new Intent(self, MainActivity.class);
                    //startActivity(i);
                    //finish();
                }
            }, 500);
        }
    }
    else{
        Toast.makeText(this,"NO FB TOKEN",Toast.LENGTH_LONG).show();
    }
}

Answer 1

您每次都在Activity的onCreate方法中调用logout。

 LoginManager.getInstance().logOut();

Answer 2

只需删除此行

即可

LoginManager.getInstance().logOut();

在onCreate方法上调用logout方法意味着每次应用程序启动时都会从facebook注销。

android facebook sdk总是在重启时要求登录

2 个答案: