okhttp kotlin
时间: 2023-10-19 18:08:11 浏览: 42
引用中提到了一个名为"OkHttp3 的扩展"的小型库,它提供了一个await()扩展函数用于与Kotlin协程集成。这个库需要Kotlin 1.3,并且并不需要更新到需要Java 8或Android 5。它可以与OkHttp一起使用。<span class="em">1</span>
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- *1* [java重量级源码-kotlin-coroutines-okhttp:用于OkHttp调用的Kotlin协程await()扩展](https://download.csdn.net/download/weixin_38682518/19406473)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_2"}}] [.reference_item style="max-width: 100%"]
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相关问题
kotlin中okhttp3
在Kotlin中使用OkHttp3发送HTTP请求的步骤如下:
1. 首先,确保在项目的build.gradle文件中导入OkHttp3的依赖。可以在dependencies块中添加以下行来导入OkHttp3库:
```
implementation 'com.squareup.okhttp3:okhttp:4.8.1'
```
2. 在Kotlin类中,创建一个用于发送请求的方法。可以将此方法放在Activity中,并在onCreate方法中调用。以下是一个示例方法:
```
private fun sendRequestWithOkHttp() {
thread {
val client = OkHttpClient()
val request = Request.Builder()
.url("http:******")
.build()
val response = client.newCall(request).execute()
val responseData = response.body?.string()
if (responseData != null) {
parseJSONWithJSONObject(responseData)
}
}
}
```
3. 如果你要发送的是HTTP请求(而不是HTTPS),则需要在res文件夹下创建一个network.xml文件,并在其中添加以下代码:
```xml
<?xml version="1.0" encoding="utf-8"?>
<network-security-config>
<base-config cleartextTrafficPermitted="true" />
</network-security-config>
```
以上就是在Kotlin中使用OkHttp3发送HTTP请求的基本步骤。你可以根据自己的需求进行进一步的调整和配置。
android kotlin okhttp3 下载文件 并带下载进度
### 回答1:
在 Android Kotlin 中使用 OkHttp3 下载文件并带有下载进度,可以通过以下步骤实现:
1. 添加 OkHttp3 依赖
在 app module 的 build.gradle 文件中添加以下代码:
```
dependencies {
implementation 'com.squareup.okhttp3:okhttp:4.9.0'
}
```
2. 创建 OkHttp3 客户端
在代码中创建一个 OkHttpClient 客户端:
```
val client = OkHttpClient()
```
3. 创建下载请求
使用 OkHttp3 的 Request.Builder 创建一个下载请求,并设置下载 URL 和保存文件的路径:
```
val request = Request.Builder()
.url("https://example.com/file.zip")
.build()
```
4. 创建下载监听器
定义一个回调接口,用于监听下载进度:
```
interface DownloadListener {
fun onDownloadProgress(progress: Int)
}
```
在代码中实现这个接口,并在其中更新下载进度,例如:
```
val listener = object : DownloadListener {
override fun onDownloadProgress(progress: Int) {
runOnUiThread {
// 更新下载进度条
progressBar.progress = progress
}
}
}
```
5. 发起下载请求
使用 OkHttpClient 的 newCall 方法发起下载请求,并在 enqueue 方法中传入一个 Callback 参数,该参数将在下载完成时回调:
```
client.newCall(request).enqueue(object : Callback {
override fun onFailure(call: Call, e: IOException) {
// 下载失败
}
override fun onResponse(call: Call, response: Response) {
val inputStream: InputStream = response.body?.byteStream() ?: return
// 保存文件并更新下载进度
val totalSize: Long = response.body?.contentLength() ?: -1
var downloadedSize: Long = 0
val outputStream = FileOutputStream("/storage/emulated/0/Download/file.zip")
val buffer = ByteArray(8192)
while (true) {
val bytes = inputStream.read(buffer)
if (bytes == -1) break
outputStream.write(buffer, 0, bytes)
downloadedSize += bytes
val progress = (downloadedSize * 100 / totalSize).toInt()
listener.onDownloadProgress(progress)
}
outputStream.close()
inputStream.close()
// 下载完成
}
})
```
这段代码中,我们首先从 response.body 中获取输入流并创建输出流,然后使用循环逐段读取输入流的数据,再将其写入输出流,并计算下载进度,最后调用 DownloadListener 的 onDownloadProgress 方法更新下载进度。在下载完成后,我们需要关闭输入流和输出流,以及在 onFailure 方法中处理下载失败的情况。
6. 完整代码
最终的代码应该类似于这样:
```
interface DownloadListener {
fun onDownloadProgress(progress: Int)
}
val client = OkHttpClient()
val request = Request.Builder()
.url("https://example.com/file.zip")
.build()
val listener = object : DownloadListener {
override fun onDownloadProgress(progress: Int) {
runOnUiThread {
// 更新下载进度条
progressBar.progress = progress
}
}
}
client.newCall(request).enqueue(object : Callback {
override fun onFailure(call: Call, e: IOException) {
// 下载失败
}
override fun onResponse(call: Call, response: Response) {
val inputStream: InputStream = response.body?.byteStream() ?: return
// 保存文件并更新下载进度
val totalSize: Long = response.body?.contentLength() ?: -1
var downloadedSize: Long = 0
val outputStream = FileOutputStream("/storage/emulated/0/Download/file.zip")
val buffer = ByteArray(8192)
while (true) {
val bytes = inputStream.read(buffer)
if (bytes == -1) break
outputStream.write(buffer, 0, bytes)
downloadedSize += bytes
val progress = (downloadedSize * 100 / totalSize).toInt()
listener.onDownloadProgress(progress)
}
outputStream.close()
inputStream.close()
// 下载完成
}
})
```
注意,这段代码中保存文件的路径是硬编码的,你需要根据实际需求修改它。另外,为了更新 UI,我们需要在 onDownloadProgress 方法中使用 runOnUiThread 方法,以确保在主线程中执行。
### 回答2:
在Android中使用Kotlin和OkHttp3下载文件并显示下载进度,可以按照以下步骤进行操作:
首先,确保已在项目的build.gradle文件中添加以下依赖项:
```kotlin
implementation 'com.squareup.okhttp3:okhttp:4.10.0'
implementation 'com.squareup.okhttp3:okhttp-urlconnection:4.10.0'
```
接下来,创建一个下载文件的函数:
```kotlin
fun downloadFile(url: String, saveFilePath: String) {
val client = OkHttpClient.Builder()
.addNetworkInterceptor { chain ->
val originalResponse = chain.proceed(chain.request())
val responseBody = originalResponse.body()
if (responseBody != null) {
originalResponse.newBuilder()
.body(DownloadProgressResponseBody(responseBody, object : DownloadProgressListener {
override fun update(progress: Int) {
// 在这里更新下载进度
Log.d("DownloadProgress", "Progress: $progress%")
}
}))
.build()
} else {
originalResponse
}
}
.build()
val request = Request.Builder()
.url(url)
.build()
val response = client.newCall(request).execute()
response?.body()?.byteStream()?.use { input ->
File(saveFilePath).outputStream().use { output ->
input.copyTo(output)
}
}
}
```
接下来,创建一个自定义的ResponseBody类来监听下载进度:
```kotlin
interface DownloadProgressListener {
fun update(progress: Int)
}
class DownloadProgressResponseBody(private val responseBody: ResponseBody, private val listener: DownloadProgressListener) :
ResponseBody() {
private var bufferedSource: BufferedSource? = null
override fun contentType(): MediaType? = responseBody.contentType()
override fun contentLength(): Long = responseBody.contentLength()
override fun source(): BufferedSource {
if (bufferedSource == null) {
bufferedSource = responseBody.source()
.buffer()
.let { source ->
ForwardingSource(source).apply {
addTransferListener(object : ForwardingSource.TransferListener {
var totalBytesRead = 0L
override fun onTransferStarted(source: ForwardingSource?, transferredBytes: Long, totalBytes: Long) {
totalBytesRead = 0L
}
override fun onBytesTransferred(source: ForwardingSource?, transferredBytes: Long) {
totalBytesRead += transferredBytes
val progress = (totalBytesRead * 100 / responseBody.contentLength()).toInt()
listener.update(progress)
}
override fun onTransferEnd(source: ForwardingSource?) {
listener.update(100)
}
})
}
}
}
return bufferedSource!!
}
}
```
最后,你可以在你的活动或片段中调用这个下载函数来下载文件:
```kotlin
val url = "http://example.com/file.mp3"
val saveFilePath = "<保存文件的路径>"
downloadFile(url, saveFilePath)
```
这样,你就可以使用Android Kotlin和OkHttp3下载文件并显示下载进度了。
### 回答3:
在Android中使用Kotlin编程语言通过OkHttp3下载文件并带有下载进度可通过以下步骤实现:
1. 添加OkHttp3依赖库到项目的build.gradle文件中:
```kotlin
dependencies {
implementation 'com.squareup.okhttp3:okhttp:版本号'
}
```
2. 在需要下载文件的地方,创建一个OkHttpClient实例并设置进度监听器:
```kotlin
val client = OkHttpClient.Builder()
.addNetworkInterceptor { chain ->
val originalResponse = chain.proceed(chain.request())
originalResponse.newBuilder()
.body(ProgressResponseBody(originalResponse.body()!!, object : ProgressListener {
override fun update(bytesRead: Long, contentLength: Long, done: Boolean) {
val progress = (100 * bytesRead / contentLength).toInt()
//更新下载进度
}
}))
.build()
}
.build()
```
3. 创建一个自定义的ResponseBody类ProgressResponseBody,实现进度监听功能:
```kotlin
class ProgressResponseBody(
private val responseBody: ResponseBody,
private val progressListener: ProgressListener
) : ResponseBody() {
private var bufferedSource: BufferedSource? = null
override fun contentType(): MediaType? {
return responseBody.contentType()
}
override fun contentLength(): Long {
return responseBody.contentLength()
}
override fun source(): BufferedSource {
if (bufferedSource == null) {
bufferedSource = source(responseBody.source()).buffer()
}
return bufferedSource as BufferedSource
}
private fun source(source: Source): Source {
return object : ForwardingSource(source) {
var totalBytesRead = 0L
override fun read(sink: Buffer, byteCount: Long): Long {
val bytesRead = super.read(sink, byteCount)
totalBytesRead += if (bytesRead != -1L) bytesRead else 0L
progressListener.update(
totalBytesRead,
responseBody.contentLength(),
bytesRead == -1L
)
return bytesRead
}
}
}
}
```
4. 创建一个ProgressListener接口,用于更新下载进度:
```kotlin
interface ProgressListener {
fun update(bytesRead: Long, contentLength: Long, done: Boolean)
}
```
5. 使用OkHttpClient发送下载请求并进行文件下载:
```kotlin
val request = Request.Builder()
.url("文件下载链接")
.build()
client.newCall(request).enqueue(object : Callback {
override fun onFailure(call: Call, e: IOException) {
//下载失败处理
}
override fun onResponse(call: Call, response: Response) {
val inputStream = response.body()?.byteStream()
val file = File(Environment.getExternalStorageDirectory(), "下载文件名")
val outputStream = FileOutputStream(file)
val buffer = ByteArray(4096)
var readCount: Int
var totalRead = 0L
while (inputStream?.read(buffer).also { readCount = it ?: -1 } != -1) {
outputStream.write(buffer, 0, readCount)
totalRead += readCount
//更新下载进度
val progress = (100 * totalRead / response.body()?.contentLength()!!).toInt()
}
outputStream.flush()
outputStream.close()
inputStream?.close()
//下载完成处理
}
})
```
通过以上步骤,我们可以在Android使用Kotlin和OkHttp3下载文件,并在下载过程中实时更新下载进度。