[코틀린코드연습장] startActivityForResult(1)

여전히 어디에 사용할수 있는 메소드인지 알수는 없지만, 

강좌에 있으니까 한번 해보자. 

썩 어렵지는 않은데 왜 이리 암기가 안되지 ㅋ

두번째 액티비티에서 돌아올때 값을 물고 온다. 

OK는 -1, Cancel은 0, FirstUser는 1이다. 

[메인액티비티]

class MainActivity : AppCompatActivity() {

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

        a1_btn1.setOnClickListener {
            var intent = Intent(this, Main2Activity::class.java)
            startActivityForResult(intent, 100)
        }

        a1_btn2.setOnClickListener {
            var intent = Intent(this, Main3Activity::class.java)
            startActivityForResult(intent, 101)
        }

        a1_btn3.setOnClickListener {
            finish()
        }

    }

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)

        when(requestCode) {
            100 -> {
                a1_txt2.text = "Back From 2nd Activity,,,\n"
                when(resultCode) {
                    Activity.RESULT_OK -> a1_txt2.append("${resultCode} : RESULT OK")
                    Activity.RESULT_CANCELED -> a1_txt2.append("${resultCode} : RESULT CANCELED")
                    Activity.RESULT_FIRST_USER -> a1_txt2.append("${resultCode} : RESULT FIRST_USER")
                }

            }
            101 -> a1_txt2.text = "Back From 3rd Activity"
        }

    }
}

[두번째액티비티]

class Main2Activity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main2)

        a2_btn1.setOnClickListener {
            setResult(Activity.RESULT_OK)
            finish()
        }

        a2_btn2.setOnClickListener {
            setResult(Activity.RESULT_CANCELED)
            finish()
        }

        a2_btn3.setOnClickListener {
            setResult(Activity.RESULT_FIRST_USER)
            finish()
        }



    }
}

[세번째액티비티]

class Main3Activity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main3)

        a3_btn1.setOnClickListener {
            finish()
        }

    }
}