Android:如何使用协程从互联网读取文件？

implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.5.0'

import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.async
import kotlinx.coroutines.withContext
import okhttp3.OkHttpClient
import okhttp3.Request
import okhttp3.Response

suspend fun readFileFromInternet(url: String): String = withContext(Dispatchers.IO) {
    val client = OkHttpClient()
    val request = Request.Builder()
        .url(url)
        .build()
    val response: Response = client.newCall(request).execute()
    return@withContext response.body()?.string() ?: ""
}

import kotlinx.coroutines.GlobalScope
import kotlinx.coroutines.launch

val url = "https://example.com/file.txt"

GlobalScope.launch {
    val fileContent = readFileFromInternet(url)
    // 处理文件内容
    // ...
}.start()

plugins {
    id 'kotlin-android'
    id 'kotlin-android-extensions'
    id 'kotlin-kapt'
}

import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.MainScope
import kotlinx.coroutines.cancel

class MainActivity : AppCompatActivity(), CoroutineScope by MainScope() {

    override fun onDestroy() {
        super.onDestroy()
        cancel() // 取消协程
    }
    
    // ...
}