mAuth.signInWithCredential(credential)
        .addOnCompleteListener(this) {
            task ->              
            if (task.isSuccessful) {
                // Sign in success,update UI with the signed-in user's information
                Log.d(TAG,"signInWithCredential:success")

            } else {
                // If sign in fails,display a message to the user.
                Log.w(TAG,"signInWithCredential:failure",task.exception)
                Toast.makeText(
                    baseContext,"Authentication failed.",Toast.LENGTH_SHORT
                ).show()
                //updateUI(null)
            }

1. 如果我使用上述代码通过Firebase登录Facebook，则task.isSuccessful每次都会出错，否则部分将被执行
   谢谢！