82 lines
2.6 KiB
Markdown
82 lines
2.6 KiB
Markdown
---
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tags:
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aliases:
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date: 2024-06-05
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time: 19:06:00
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description:
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---
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Ktor是由Kotlin提供的一個framwork。
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要在Android使用Ktor，需要在build.gradle加入以下的dependency:
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```
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implementation "io.ktor:ktor-server-core:2.0.1" // Ktor的核心包
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implementation "io.ktor:ktor-server-jetty:2.0.1" // 供Ktor使用的引擎包，另外有Jetty, Tomcat, CIO可用
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implementation "io.ktor:ktor-gson:1.2.5"
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// implementation "io.ktor:ktor-server-call-logging:2.0.1" // 用於印出Request及Response的log用
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// implementation "io.ktor:ktor-server-partial-content:2.0.1" // 用於支援PartialContent用
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// implementation "io.ktor:ktor-server-cors:2.0.1" // 用於支援CORS用
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// implementation "io.ktor:ktor-server-html-builder:2.0.1" // 用於回傳客製html用
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```
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在`packagingOptions`裡，也需要加入以下的設定來必面編譯問題[[Ktor#^68d958 ]] ：
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```
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packagingOptions {
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exclude 'META-INF/*'
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}
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```
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在`AndroidManifest.xml`中，記得加入internet的權限：
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```
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<uses-permission android:name="android.permission.INTERNET"/>
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```
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然後就是 HTTP Server 的 code 了，注意 Netty 在 Android 上不能用，要改用 Jetty 或是 CIO：
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```kotlin
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import io.ktor.server.jetty.Jetty
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import io.ktor.server.engine.embeddedServer
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import io.ktor.server.routing.routing
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import io.ktor.server.routing.get
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import io.ktor.server.application.*
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import io.ktor.server.response.respondText
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embeddedServer(Jetty, 9000) {
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routing {
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get("/") {
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call.respondText("Hello, world!")
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}
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}
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}.start(wait = false)
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```
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但是這段code會block，所以需要一個thread把它包起來：
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```kotlin
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Thread {
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httpEngine = embeddedServer(Netty, 8080) {
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install(ContentNegotiation) {
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gson {}
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}
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routing {
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get("/") {
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call.respond(mapOf("message" to "Hello world"))
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}
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get("/say/{something}") {
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call.respond(mapOf("message" to "You say: " + call.parameters["something"]))
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activity?.findViewById<TextView>(R.id.textView)?.text = "You say: " + call.parameters["something"]
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}
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}
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}.start(wait = false)
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}.start()
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```
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# 參考來源
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- 如果沒有這一段會產生如下錯誤 ^68d958
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```
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13 files found with path 'META-INF/INDEX.LIST'.
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Adding a packagingOptions block may help, please refer to
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https://developer.android.com/reference/tools/gradle-api/7.4/com/android/build/api/dsl/ResourcesPackagingOptions
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for more information
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``` |