uri转RequestBody,uri转MultipartBody.Part

//uri转MultipartBody.Part
fun Uri.asPart(name:String,context: Context):MultipartBody.Part{
    val contentResolver = context.contentResolver
    val displayName = run {
        val cursor = contentResolver.query(this, null, null, null, null)
        cursor?.let {
            if(it.moveToFirst())
                it.getString(cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME))
            else null
        }
    }?:"${System.currentTimeMillis()}.${MimeTypeMap.getSingleton().getExtensionFromMimeType(contentResolver.getType(this))}"
    return MultipartBody.Part.createFormData(name,displayName, asRequestBody(context))
}

//uri转requestBody
fun Uri.asRequestBody(context:Context):RequestBody = object :RequestBody(){
    override fun contentType(): MediaType = MediaType.get(getMimeType(context))
    override fun writeTo(sink: BufferedSink) {
        val ips = context.contentResolver.openInputStream(this@asRequestBody)
        ips?.let {  sink.writeAll(Buffer().readFrom(it,contentLength())) }
    }
    override fun contentLength(): Long = context.contentResolver.openFileDescriptor(this@asRequestBody,"r")?.statSize?:0L
}

//返回文件的mimetype
fun Uri.getMimeType(context: Context) = context.contentResolver.getType(this)?:"multipart/form-data"

本文地址：https://blog.csdn.net/jingzz1/article/details/108577319