OwnSolutionActivity.kt

class OwnSolutionActivity : Activity() {

    private lateinit var binding: ActivityOwnSolutionBinding

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = ActivityOwnSolutionBinding.inflate(layoutInflater)

        binding.button.setOnClickListener {
            val intent = Intent(Intent.ACTION_GET_CONTENT)
            intent.type = "image/*"
            startActivityForResultAndHandle(intent) { resultCode, intent ->
                if(resultCode == RESULT_OK) {
                    binding.image.load(intent?.data)
                }
            }
        }

        setContentView(binding.root)
    }

    private var handleResult: ((Int, Intent?) -> Unit)? = null

    private fun startActivityForResultAndHandle(intent: Intent, lambda: ((Int, Intent?) -> Unit)) {
        handleResult = lambda
        startActivityForResult(intent, 300)
    }

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