<activity
    android:name=".MyActivity"
    android:windowSoftInputMode="stateHidden"
    android:exported="false" />

<EditText
    android:id="@+id/scanInput"
    android:layout_width="0dp"
    android:layout_height="0dp"
    android:focusable="true"
    android:focusableInTouchMode="true"
    android:focusedByDefault="true"
    android:importantForAutofill="no"
    android:inputType="none" />

class MyActivity : AppCompatActivity() {
    private lateinit var binding: ActivityMyBinding
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = ActivityMyBinding.inflate(layoutInflater)
        hideStatusBar()
        setContentView(binding.root)
        hideSoftKeyboard()
    }
    override fun onResume() {
        super.onResume()
        hideSoftKeyboard()
        hideActionBar()
    }
    private fun hideSoftKeyboard() {
        window.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN)
        this.currentFocus?.let { view ->
            val imm = getSystemService(Context.INPUT_METHOD_SERVICE) as? InputMethodManager
            imm?.hideSoftInputFromWindow(view.windowToken, InputMethodManager.RESULT_HIDDEN)
        }
    }
    private fun hideStatusBar() {
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        window.setFlags(
            WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN
        )
    }
    private fun hideActionBar() {
        window.decorView.systemUiVisibility = View.SYSTEM_UI_FLAG_FULLSCREEN
        actionBar?.hide()
    }
}