I'm new at Kotlin, and I'm doing a simple app where the user writes something on EditText, presses a button then the app proceeds to show that text on SecondActivity, on that SecondActivity the user can do exactly the same thing, but on the FirstActivity (the one who shows up on the user starts the app) there are on EditText with "Welcome" text for default that shows empty when the application starts, this started to happen when I implement the text to be substituted by what the user writes on the SecondActivity

Here's the code for the FirtActivity

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val result = findViewById<TextView>(R.id.nomeUser)
        

        val nameEntered = findViewById<EditText>(R.id.nameEntered)
        val button = findViewById<Button>(R.id.button)

        button.setOnClickListener{

            val name = nameEntered.text.toString()

            val intent = Intent(this@MainActivity, NomeEscrito::class.java)
            intent.putExtra("Name", name)
            startActivity(intent)
        }

        val intent = intent
        val name = intent.getStringExtra("Name")



        result.text = name


    }
}

And here's the code for the SecondActivity

class NomeEscrito : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_nome_escrito)

        val intent = intent
        val name = intent.getStringExtra("Name")

        val result = findViewById<TextView>(R.id.result)

        result.text = name

        val wordEntered = findViewById<EditText>(R.id.textPhrase)
        val button2 = findViewById<Button>(R.id.button2)

        button2.setOnClickListener{

            val name2 = wordEntered.text.toString()

            val intent2 = Intent(this@NomeEscrito, MainActivity::class.java)
            intent2.putExtra("Name", name2)
            startActivity(intent2)
        }

    }
}

CodePudding user response：

The problem is in the following line of your FirstActivity:

    val name = intent.getStringExtra("Name")

When you open up the app for the first time, there is no data in the intent. As a result, it returns an empty string.

You can do the a check for empty string before setting your EditText text to avoid this situation:

    if (!name.isNullOrBlank()) {
        result.text = name
    }

CodePudding user response：

Choose different keys in getStringExtra in both intent data passing