AccessToken.getCurrentAccessToken（）总是在Kotlin中返回null

我在kotlin中使用Facebook Sdk。 当我尝试使用FB共享侦听器时， AccessToken.getCurrentAccessToken()返回null。 我试过FacebookSdk.sdkInitialize(this)但已经不推荐使用了。 我怎么解决这个问题

  fun SetFacebookShareListener(sd: ShareDialog) { sd.registerCallback(mCallbackManagerFacebook, object : FacebookCallback { override fun onSuccess(result: Sharer.Result) { // Toast.makeText(DetailsFragment.this.getActivity(), "You shared this post", Toast.LENGTH_SHORT).show(); val builder1 = android.app.AlertDialog.Builder(this@MainActivity) val activeSession = AccessToken.getCurrentAccessToken() if (activeSession == null) { builder1.setMessage("Do you want us to Connect to your account with facebook?") } else if (!activeSession.permissions.contains("publish_actions")) { builder1.setMessage("Do you want us to automatically post your reward details at your facebook timeline?") } builder1.setPositiveButton("Yes") { dialog, which -> // TODO Auto-generated method stub [e-mail]() } builder1.setNegativeButton("No") { dialog, which -> // TODO Auto-generated method stub // Toast.makeText(getApplicationContext(), "test1", Toast.LENGTH_LONG).show(); } val alert = builder1.create() alert.show() } override fun onCancel() { Toast.makeText(applicationContext, "test2", Toast.LENGTH_LONG).show() } override fun onError(e: FacebookException) { // Toast.makeText(getApplicationContext(), "test3", Toast.LENGTH_LONG).show(); e.printStackTrace() } }) } 

和Facebook的连接是

  fun ConnectWithFacebook() { LoginManager.getInstance().logInWithReadPermissions(this, Arrays.asList("public_profile", "email", "user_birthday")) } 

Answer 1

由LoginManager返回的访问令牌将保存在共享首选项中，因此下次打开该应用程序时，AccessToken.getCurrentAccessToken（）应具有相同的访问令牌。 您可以查看SDK提供的示例以查看它们的工作。