I am trying to get my android app to call my local...

# ktor

[James Black]

I am trying to get my android app to call my local server. When I do this it works fine:

curl -X POST -d 'Hello' <http://0.0.0.0:8080/outfit_data>
success%

The error I get from android is:

I/System.out: Failed to connect to /0.0.0.0:8080 calling <http://0.0.0.0:8080/outfit_data>

This is my ktor 2.0.0 routing:

post("/outfit_data") {
    val data = call.receive<String>()
    println(data)
    call.respondText("success", null, HttpStatusCode.OK)
}

And on the android side this is how I make the call, and baseUrl is set as this is the top-level gradle.properties file

weather_client_host_name=<http://0.0.0.0:8080>

try {
    <http://client.post|client.post>(
        "$baseUrl/outfit_data"
    ) {
        contentType(ContentType.Application.Json)
        setBody(data)
    }.also { response ->
        return response.status == HttpStatusCode.OK || response.status == HttpStatusCode.Created
    }
} catch(e:Throwable) {
    println("${e.message} calling $baseUrl/outfit_data")
    return false
}

My code is in the androidApp, shared/androidMain and server subprojects. The http call for Android is in shared/src/androidMain/.../api/WeatherApi.kt

I also put this in the android manifest in the shared/src/androidMain:

<application
    android:usesCleartextTraffic="true">

https://github.com/jblack975/MyOutfitPicker/tree/pass_anon_data_to_server

[Andrey Tabakov]

Hello, did you run your server on the PC?

[Aleksei Tirman [JB]]

The port on your host machine isn’t exposed by default to an Android emulator or a physical device. You need to forward a port via adb or connect through a local wifi network.

[Chrimaeon]

you cannot use the loopback on an emulator. the development machine is reachable via 10.0.2.2. see here https://developer.android.com/studio/run/emulator-networking

[Chrimaeon]

If you are working on a physical device you need the local IP of your development machine.

[James Black]

Thanks, let me try that, as I am just using an emulator atm.