[移动开发]【Android】文件上传

http接口封装

首先是根据自己选用的网络框架进行文件上传的接口封装

    @Multipart
    @POST("/FreshCabinet/a/ly/app/uploadImg")
    fun uploadReserveSampleImgAsync(@PartMap params: HashMap<String, RequestBody?>?)
    :Deferred<ResponseWrapper<UploadImgBackBean>>

    suspend fun uploadReserveSampleImg(params: HashMap<String, RequestBody?>?) =
        getApiService().uploadReserveSampleImgAsync(params).await()

文件上传工具类

我们可以通过封装一个参数处理的工具类，帮我们去识别传入的是普通参数类型还是文件类型：

/**
 * Created by ZHAWENQING on 2019-02-18.
 */
class UploadHelper private constructor() {
    //根据传进来的Object对象来判断是String还是File类型的参数
    fun addParameter(key: String, o: Any): UploadHelper {
        var body: RequestBody? = null
        if (o is String) {
            body = RequestBody.create("text/plain;charset=UTF-8".toMediaTypeOrNull(), o)
        } else if (o is File) {
            body = RequestBody.create(
                "multipart/form-data;charset=UTF-8".toMediaTypeOrNull(), o
            )
        }
        params[key] = body
        return this
    }

    //建造者模式
    fun builder(): HashMap<String, RequestBody?> {
        return params
    }

    //清除参数
    fun clear() {
        params.clear()
    }

    companion object {
        @Volatile
        private var mInstance: UploadHelper? = null
        lateinit var params: HashMap<String, RequestBody?>

        //单例模式
        val instance: UploadHelper?
            get() {
                if (mInstance == null) {
                    synchronized(UploadHelper::class.java) {
                        if (mInstance == null) mInstance = UploadHelper()
                        params = HashMap()
                    }
                }
                return mInstance
            }
    }
}

页面调用处理

在页面上可以直接使用工具类将相关文件以及参数添加进参数数组中

                val helper = UploadHelper.instance
                helper?.clear()
                helper?.addParameter("img", File(imgUrl))
                val params = helper?.builder()
                cabinetViewModel.uploadImg(params, {},
                    { loadingDialog.show() },
                    { loadingDialog.dismiss() })