Run a Quart web server in Python with Chaquopy on Android (Kotlin)

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Error starting Python server: Method addObserver must be called on the main thread
Kotlin:

class MainActivity : AppCompatActivity() {

private val tag: String = "MainActivity" // Define a tag for your logs
private var serverPort: Int? = null
private lateinit var webView: WebView
private lateinit var swipeRefreshLayout: SwipeRefreshLayout

@SuppressLint("SetJavaScriptEnabled")
override fun onCreate(savedInstanceState: Bundle?) {

// Run the Python server in a background thread
Thread {
Log.i(tag, "Starting server")
Log.i(tag, "IS STARTED")
}
try {
} catch (e: Exception) {
}
}.start()

// Set webview
Log.i(tag, "Starting webview")
override fun onReceivedSslError(
view: WebView?,
handler: SslErrorHandler?,
error: SslError?
) {
// Ignore SSL certificate errors (not recommended for production)
handler?.proceed()
}
}
}
}

fun closeLoader() {
Log.i(tag, "Close loader")
}

}

Question and source license information: