Question 125160 in Android Studio Question posted in
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Android Studio – When user is logged in, directly show main activity

I want that if a user is already logged in, another activity is loaded and displayed. All in all, it all works. The only problem is that I get to see the SignIn Activity for about 2 seconds instead of the MainActivity directly. How can I change this behavior?

   override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    auth = Firebase.auth
    userAlreadyLoggedIn()

    //Is shown for 2seconds
    binding = ActivitySignInBinding.inflate(layoutInflater)
    setContentView(binding.root)   
  }



    private fun userAlreadyLoggedIn(){        
    val currentUser = auth.currentUser
    if(currentUser != null){
        var db:FirebaseFirestore = FirebaseFirestore.getInstance()
        val userRef = db.collection(KEY_COLLECTION_USER).document(auth.currentUser!!.uid)

        userRef.get().addOnSuccessListener {document ->
            if(document !== null)
            {
                val intent = Intent(applicationContext,MainActivity::class.java)
                intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK)
                startActivity(intent)
            }
        }
        
      }
   }
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2

Answers


  1. 0

    Try if below code works:

        override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = ActivitySignInBinding.inflate(layoutInflater)
        setContentView(binding.root)
        userAlreadyLoggedIn()  
    }

    private fun userAlreadyLoggedIn(){        
        val currentUserID = getCurrentUserID()
            if (currentUserID.isNotEmpty()) {
                startActivity(Intent(this@SignInActivity, MainActivity::class.java))
            } else {
                  // Do something if log in fails.
            }
    }

    fun getCurrentUserID(): String {
        val currentUser = FirebaseAuth.getInstance().currentUser
        var currentUserID = ""
        if (currentUser != null) {
            currentUserID = currentUser.uid
        }
        return currentUserID
    }
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  2. 0

    Because you call start MainActivity in SignInActivity, so it will always run onCreate of SignInActivity, then start MainActivity.

    You should have a SplashActivity, in that, check user is logged in or not.
    If user logged in, show MainActivity else show SignInActivity

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