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本篇文章给大家分享的是有关如何在Android中利用OkHttp实现一个图片上传功能，小编觉得挺实用的，因此分享给大家学习，希望大家阅读完这篇文章后可以有所收获，话不多说，跟着小编一起来看看吧。
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实现方法如下：
object UploadFileHelper {
//--------ContentType
private val MEDIA_OBJECT_STREAM = MediaType.parse("multipart/form-data")
//--------上传延时时间
private val WRITE_TIME_OUT:Long = 50
private val mOkHttpClient by lazy { OkHttpClient() }
//------基本参数----------
val version = AppConstant.API_VERSION
val platform = AppConstant.API_PLATFORM
val methodName = AppConstant.API_UPLOADFILE_METHOD
val token = ignoreException("") { UserModel.token() }
val userId = ignoreException(0) { UserModel.id() }
//------------------------
//不带参数同步上传文件
fun syncUploadFile(actionUrl: String = "",file: File,maxW: Int = 256,maxH: Int = 256):String?{
val uploadFile = optionFileSize(file,maxW,maxH,null)
if(uploadFile!=null){
val response = createNoParamsOkHttpCall(actionUrl,uploadFile).execute()
if(uploadFile.exists())
uploadFile.delete()
return getResponseToPath(response.body()!!.string())
}
return null
}
//不带参数异步上传文件
fun asyncUploadFile(actionUrl:String = "", file: File,maxW: Int = 256,maxH: Int = 256,
uploadCallBackListener: UploadCallBackListener? = null){
val uploadFile = optionFileSize(file,maxW,maxH,uploadCallBackListener)
if(uploadFile!=null)
createNoParamsOkHttpCall(actionUrl,uploadFile).enqueue(object: Callback{
override fun onFailure(c: Call, e: IOException) {
uploadCallBackListener?.onUploadFailure(e.toString())
}
override fun onResponse(c: Call, response: Response) {
if(uploadFile.exists())
uploadFile.delete()
uploadCallBackListener?.onUploadSuccess(getResponseToPath(response.body()!!.string()))
response.body()!!.close()
}
})
}
//带参数同步上传文件
fun syncParamsUploadFile(actionUrl: String= "",file: File,params:HashMap,
maxW: Int = 256,maxH: Int = 256):String?{
val uploadFile = optionFileSize(file,maxW,maxH,null)
if(uploadFile!=null){
params.put("filename",uploadFile)
val response = createParamsOkHttpCall(actionUrl,params,null,false).execute()
if(uploadFile.exists())
uploadFile.delete()
return getResponseToPath(response.body()!!.string())
}
return null
}
//带参数异步上传文件
fun asyncParamsUploadFile(actionUrl: String= "",file: File,params:HashMap,maxW: Int = 256,maxH: Int = 256,
uploadCallBackListener: UploadCallBackListener? = null, isProgress:Boolean = true){
val uploadFile = optionFileSize(file,maxW,maxH,uploadCallBackListener)
if(uploadFile!=null){
params.put("filename",uploadFile)
createParamsOkHttpCall(actionUrl,params,uploadCallBackListener,isProgress).enqueue(object :Callback{
override fun onFailure(c: Call, e: IOException) {
uploadCallBackListener?.onUploadFailure(e.toString())
}
override fun onResponse(c: Call, response: Response) {
if(uploadFile.exists())
uploadFile.delete()
uploadCallBackListener?.onUploadSuccess(getResponseToPath(response.body()!!.string()))
response.body()!!.close()
}
})
}
}
//------创建一个没有带参数的Call
fun createNoParamsOkHttpCall(actionUrl: String,file: File):Call{
val requestUrl = "${AppConstant.HOST}/$actionUrl"
val requestBody = RequestBody.create(MEDIA_OBJECT_STREAM,file)
val request = Request.Builder().url(requestUrl).post(requestBody).build()
return mOkHttpClient.newBuilder().writeTimeout(WRITE_TIME_OUT,TimeUnit.SECONDS).build().newCall(request)
}
//------创建一个带参数的Call
fun createParamsOkHttpCall(actionUrl: String,params:Map,
uploadCallBackListener: UploadCallBackListener? = null,
isProgress:Boolean = true):Call{
//-----AppConstant.HOST 上传图片的Server的BASE_URL http://xxx.com
val requestUrl = "${AppConstant.HOST}/$actionUrl"
val builder = MultipartBody.Builder()
builder.setType(MultipartBody.FORM)
val newParams = mutableMapOf(
"version" to version,
"platform" to platform,
"methodName" to methodName,
"token" to token,
"user_id" to userId)
newParams.putAll(params)
newParams.forEach( action = {
if(it.value is File){
builder.addFormDataPart(it.key, (it.value as File).name,
if(isProgress) createProgressRequestBody(MEDIA_OBJECT_STREAM!!,(it.value as File),uploadCallBackListener)
else RequestBody.create(null, (it.value as File)))
}else{
builder.addFormDataPart(it.key,it.value.toString())
}
})
val body = builder.build()
val request = Request.Builder().url(requestUrl).post(body).build()
return mOkHttpClient.newBuilder().writeTimeout(WRITE_TIME_OUT,TimeUnit.SECONDS).build().newCall(request)
}
//创建带进度RequestBody
fun createProgressRequestBody(contentType:MediaType,file:File,
uploadCallBackListener: UploadCallBackListener? = null):RequestBody{
return object:RequestBody(){
override fun contentType(): MediaType = contentType
override fun contentLength() = file.length()
override fun writeTo(sink: BufferedSink) {
ignoreException {
val source = Okio.source(file)
val buf = Buffer()
val remaining = contentLength()
var current: Long = 0
var readCount: Long = source.read(buf, 2048)
while (readCount != -1L) {
sink.write(buf, readCount)
current += readCount
uploadCallBackListener?.onUploadProgress(current,remaining)
readCount = source.read(buf, 2048)
}
}
}
}
}
//根据图片大小简单压缩
fun optionFileSize(file: File,maxW:Int,maxH:Int,uploadCallBackListener: UploadCallBackListener?):File?{
try {
val uploadFile = File(AppBridge.AppContext().externalCacheDir, file.hashCode().toString())
ImageUtils.resize(file, maxW, maxH, uploadFile)
return uploadFile
} catch (e: Exception) {
uploadCallBackListener?.onUploadFailure("压缩图片失败")
return null
}
}
//解析Server返回的数据获取图片路径，
/*
{"code":200,"msg":"上传成功","data":{"path":""}}
*/
fun getResponseToPath(response:String):String{
val dataJsonObj = JSONObject(response).get("data") as JSONObject
return dataJsonObj.get("path") as String
}
//回调方法
interface UploadCallBackListener{
fun onUploadFailure(error:String)
fun onUploadProgress(currentSize:Long,totalSize:Long)
fun onUploadSuccess(path:String)
}
} inline funignoreException(def: T, f: () -> T): T { try { return f() } catch(e: Exception) { Timber.e(e, "") return def } }
最后根据是否要带参数、同步或异步调用其中对应的方法可以了
syncUploadFile(xxx) asyncUploadFile(xxx) syncParamsUploadFile(xxx) asyncParamsUploadFile(xxx)
总结
首先根据是否要带参数上传，如果不带参数上传，直接创建RequestBody;如果带参数上传,创建MultipartBody.Builder(),然后把所有参数addFormDataPart进去，其中addFormDataPart方法有个RequestBody参数通过是否要监听进度创建，如果需要进度，需重写RequestBody的writeTo()方法，如果不监听进度，直接创建RequestBody，最后builder.build()得到RequestBody
通过上步骤得到的RequestBody以及上传图片的Server路径，可以配置出一个Request对象。
把Request对象通过.newCall(request)配置在OkHttpClient得到Call对象
最后Call调用同步.execute()或者异步.enqueue(callBack),在回调里面处理返回的数据。
以上就是如何在Android中利用OkHttp实现一个图片上传功能，小编相信有部分知识点可能是我们日常工作会见到或用到的。希望你能通过这篇文章学到更多知识。更多详情敬请关注创新互联行业资讯频道。