Jetpack Compose 通过 OkHttp 发送 HTTP 请求的示例

下面是一个使用 Kotlin 和 Jetpack Compose 来演示通过 OkHttp 发送 HTTP 请求的示例。这个示例包括在 Jetpack Compose 中发送一个 GET 请求和一个 POST 请求，并显示结果。

添加okhttp依赖

首先，在你的 build.gradle.kts 文件中添加必要的依赖：

dependencies {implementation("com.squareup.okhttp3:okhttp:4.10.0")//其他依赖
}

INTERNET 权限

你需要在 AndroidManifest.xml 文件中添加网络权限声明。请按照以下步骤操作：

1. 打开 AndroidManifest.xml 文件。
2. 在 <manifest> 标签内添加 <uses-permission android:name="android.permission.INTERNET"/>。

你的 AndroidManifest.xml 文件应该如下所示：

<manifest xmlns:android="http://schemas.android.com/apk/res/android"package="com.example.yourapp"><uses-permission android:name="android.permission.INTERNET"/><applicationandroid:allowBackup="true"android:icon="@mipmap/ic_launcher"android:label="@string/app_name"android:roundIcon="@mipmap/ic_launcher_round"android:supportsRtl="true"android:theme="@style/Theme.YourApp"><activity android:name=".MainActivity"><intent-filter><action android:name="android.intent.action.MAIN" /><category android:name="android.intent.category.LAUNCHER" /></intent-filter></activity></application></manifest>

添加这个权限声明后，再次运行你的应用程序，它应该能够正常进行网络请求。

主程序代码

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.*
import androidx.compose.material.*
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Text
import androidx.compose.runtime.*
import androidx.compose.ui.Modifier
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp
import kotlinx.coroutines.*
import okhttp3.*
import okhttp3.MediaType.Companion.toMediaType
import okio.IOExceptionclass MainActivity : ComponentActivity() {override fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)setContent {MyApp()}}
}@Composable
fun MyApp() {var getResponse by remember { mutableStateOf("Loading...") }var postResponse by remember { mutableStateOf("Loading...") }LaunchedEffect(Unit) {getResponse = performGetRequest()postResponse = performPostRequest()}Column(modifier = Modifier.padding(16.dp)) {Text(text = "GET Response:", style = MaterialTheme.typography.bodyLarge)Spacer(modifier = Modifier.height(8.dp))Text(text = getResponse)Spacer(modifier = Modifier.height(16.dp))Text(text = "POST Response:", style = MaterialTheme.typography.bodyLarge)Spacer(modifier = Modifier.height(8.dp))Text(text = postResponse)}
}suspend fun performGetRequest(): String = withContext(Dispatchers.IO) {val client = OkHttpClient()val request = Request.Builder().url("https://jsonplaceholder.typicode.com/posts/1").build()client.newCall(request).execute().use { response ->if (!response.isSuccessful) throw IOException("Unexpected code $response")response.body?.string() ?: "No response body"}
}suspend fun performPostRequest(): String = withContext(Dispatchers.IO) {val client = OkHttpClient()val JSON = "application/json; charset=utf-8".toMediaType()val json = """{ "title": "foo", "body": "bar", "userId": 1 }"""val body = RequestBody.create(JSON, json)val request = Request.Builder().url("https://jsonplaceholder.typicode.com/posts").post(body).build()client.newCall(request).execute().use { response ->if (!response.isSuccessful) throw IOException("Unexpected code $response")response.body?.string() ?: "No response body"}
}@Preview(showBackground = true)
@Composable
fun DefaultPreview() {MyApp()
}

参考

某AI的生成