Downloading pdf file using OKHTTP

Question

I am using ok-http in my android application.

I have url of .pdf file which is coming from web-service.

I have to download pdf file on click event of ImageView. I have searched it on google but, couldn't find specific answer.

Please, provide me solution if anyone knows about it. Thanks.

Answer 1

I use OKHttp to download PDFs with a function like this. The only difference with downloading a PDF and a json file is how you handle the response. I use response.body?.byteStream() for PDFs.

fun downloadPdf(context: Context, pdfUrl: String, completion: (Boolean) -> Unit) {

    val request = Request.Builder()
        .url(pdfUrl)
        .build()
    val client = OkHttpClient.Builder()
        .build()

    client.newCall(request).enqueue(object: Callback {

        override fun onResponse(call: Call, response: Response) {
            println("successful download")

            val pdfData = response.body?.byteStream()

           //At this point you can do something with the pdf data
           //Below I add it to internal storage

            if (pdfData != null) {

                try {
                    context.openFileOutput("myFile.pdf", Context.MODE_PRIVATE).use { output ->
                        output.write(pdfData.readBytes())
                    }

                } catch (e: IOException) {
                    e.printStackTrace()
                }
            }
            completion(true)
        }

        override fun onFailure(call: Call, e: IOException) {

            println("failed to download")
            completion(true)
        }
    })
}