---
tags: 
aliases: 
date: 2024-06-05
time: 19:06:00
description:
---

Ktor是由Kotlin提供的一個framwork。
要在Android使用Ktor，需要在build.gradle加入以下的dependency:
```
implementation "io.ktor:ktor:1.2.5"
implementation "io.ktor:ktor-server-netty:1.2.5"
implementation "io.ktor:ktor-gson:1.2.5"
```

在`packagingOptions`裡，也需要加入以下的設定來必面編譯問題[[Ktor#^68d958 ]] ：
```
packagingOptions {
    exclude 'META-INF/*'
}
```

在`AndroidManifest.xml`中，記得加入internet的權限：
```
<uses-permission android:name="android.permission.INTERNET"/>
```

然後就是HTTP Server的code了：
```
embeddedServer(Netty, 8080) {
    install(ContentNegotiation) {
        gson {}
    }
    routing {
        get("/") {
            call.respond(mapOf("message" to "Hello world"))
        }
    }
}.start(wait=true)
```

但是這段code會block，所以需要一個thread把它包起來：
```kotlin
Thread {
    httpEngine = embeddedServer(Netty, 8080) {  
        install(ContentNegotiation) {  
            gson {}  
        } 
        routing {  
            get("/") {  
                call.respond(mapOf("message" to "Hello world"))  
            }  

            get("/say/{something}") {  
                call.respond(mapOf("message" to "You say: " + call.parameters["something"]))  

                activity?.findViewById<TextView>(R.id.textView)?.text = "You say: " + call.parameters["something"]  
            }  
        } 
    }.start(wait = false)  
}.start()
```


# 參考來源

- 如果沒有這一段會產生如下錯誤 ^68d958
```
13 files found with path 'META-INF/INDEX.LIST'.
Adding a packagingOptions block may help, please refer to
https://developer.android.com/reference/tools/gradle-api/7.4/com/android/build/api/dsl/ResourcesPackagingOptions
for more information
```