android - 如何在android应用程序中显示存储在s3中的所有类型的文档（.docx、.csv、.xls、.pdf、.txt）？

我知道这可能不是最好的解决方案，但是我建议您暂时下载文件并通过意图打开它，因为您不可能在webview.

您可以编写一个实用程序类来下载文件，然后在任务完成后将其传递给意图和删除。

private open inner class DownloadFile : AsyncTask<String, Void, String>() {

        override fun onPreExecute() {
            super.onPreExecute()
            AppUtil.showDialog(context)
        }

        override fun doInBackground(vararg strings: String): String? {

            var fName = strings[0].substring(strings[0].lastIndexOf('/') + 1)
            fName = fName.replace(" ", "_")


            val fileUrl = strings[0]
            val extStorageDirectory = Environment.getExternalStorageDirectory().toString()
            val folder = File(extStorageDirectory, "My_Application_name")
            folder.mkdir()

            val mFile = File(folder, fName)

            try {
                mFile.createNewFile()
            } catch (e: IOException) {
                e.printStackTrace()
            }

            FileDownloader.downloadFile(fileUrl, mFile)
            return fName
        }

        override fun onPostExecute(result: String?) {
            super.onPostExecute(result)
            AppUtil.dismissDialog()
            openMyFile(result)
        }
    }

然后使用以下意图打开该文件

fun openFile(url: File) {

    val uri = Uri.fromFile(url)

    val intent = Intent(Intent.ACTION_VIEW)
    if (url.toString().contains(".doc") || url.toString().contains(".docx")) {
        // Word document
        intent.setDataAndType(uri, "application/msword")
    } else if (url.toString().contains(".pdf")) {
        // PDF file
        intent.setDataAndType(uri, "application/pdf")
    } else if (url.toString().contains(".ppt") || url.toString().contains(".pptx")) {
        // Powerpoint file
        intent.setDataAndType(uri, "application/vnd.ms-powerpoint")
    } else if (url.toString().contains(".xls") || url.toString().contains(".xlsx")) {
        // Excel file
        intent.setDataAndType(uri, "application/vnd.ms-excel")
    } else if (url.toString().contains(".zip") || url.toString().contains(".rar")) {
        // WAV audio file
        intent.setDataAndType(uri, "application/x-wav")
    } else if (url.toString().contains(".rtf")) {
        // RTF file
        intent.setDataAndType(uri, "application/rtf")
    } else if (url.toString().contains(".wav") || url.toString().contains(".mp3")) {
        // WAV audio file
        intent.setDataAndType(uri, "audio/x-wav")
    } else if (url.toString().contains(".gif")) {
        // GIF file
        intent.setDataAndType(uri, "image/gif")
    } else if (url.toString().contains(".jpg") || url.toString().contains(".jpeg") || url.toString().contains(".png")) {
        // JPG file
        intent.setDataAndType(uri, "image/jpeg")
    } else if (url.toString().contains(".txt")) {
        // Text file
        intent.setDataAndType(uri, "text/plain")
    } else if (url.toString().contains(".3gp") || url.toString().contains(".mpg") || url.toString().contains(".mpeg") || url.toString().contains(
            ".mpe"
        ) || url.toString().contains(".mp4") || url.toString().contains(".avi")
    ) {
        // Video files
        intent.setDataAndType(uri, "video/*")
    } else {
        //if you want you can also define the intent type for any other file
        //additionally use else clause below, to manage other unknown extensions
        //in this case, Android will show all applications installed on the device
        //so you can choose which application to use
        intent.setDataAndType(uri, "*/*")
    }

    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
    startActivity(intent)

}

任务结束后，您可以删除下载的文件。

android - 如何在android应用程序中显示存储在s3中的所有类型的文档（.docx、.csv、.xls、.pdf、.txt）？

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解决方案

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