deploy_model_android_2.kt

private lateinit var activityMainBinding : ActivityMainBinding
private lateinit var progressDialog : ProgressDialog

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    activityMainBinding = ActivityMainBinding.inflate( layoutInflater )
    setContentView( activityMainBinding.root )

    progressDialog = ProgressDialog( this )

    activityMainBinding.selectImageButton.setOnClickListener {
        dispatchSelectPictureIntent()
    }

}

// Dispatch Intent to let the user select an image from the gallery
private fun dispatchSelectPictureIntent() {
    val selectPictureIntent = Intent( Intent.ACTION_OPEN_DOCUMENT ).apply {
        type = "image/*"
        addCategory( Intent.CATEGORY_OPENABLE )
    }
    activityResultLauncher.launch( selectPictureIntent )
}

// Intercept the result of the select image intent here.
private val activityResultLauncher = registerForActivityResult( ActivityResultContracts.StartActivityForResult() ) {
    if ( it.data == null ) {
        // If the user didn't select any image from the gallery
        return@registerForActivityResult
    }
    progressDialog.setMessage( "🤳 Detecting faces ..." )
    progressDialog.show()
    val inputStream = contentResolver.openInputStream( it.data?.data!! )
    val bitmap = BitmapFactory.decodeStream( inputStream )
    inputStream?.close()
    // Pass the image to the face detector
    detectFaces( bitmap )
}