Question

这是我的代码，用于尝试打开我从base64字符串创建的文件：

var decodedBytes = Base64.decode(filtered.first().contentsB64String, Base64.NO_WRAP)
var ext = FilenameUtils.getExtension(commonName)
fileTemporary = File(Environment.getExternalStorageDirectory().toString() + "/xelion/xelion_temp." + ext)
if (fileTemporary != null) {
    if (!fileTemporary!!.exists()) {
        fileTemporary?.createNewFile()
    }
    FileUtils.writeByteArrayToFile(fileTemporary, decodedBytes)
    var intent = Intent(Intent.ACTION_VIEW)
    intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
    var uri = Uri.fromFile(fileTemporary)
    if (Build.VERSION.SDK_INT >= 24) {
        uri = Uri.parse(fileTemporary!!.getPath())
    }
    intent.setDataAndType(uri, filtered.first().mimeType)
    activity!!.startActivity(intent)
}

我也尝试过此方法，但是仍然出现相同的错误：

    fun openFile(url: Uri) {
        var intent = Intent(Intent.ACTION_VIEW)
        intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
        if (url.toString().contains(".doc") || url.toString().contains(".docx")) {
            // Word document
            intent.setDataAndType(url, "application/msword")
        } else if (url.toString().contains(".pdf")) {
            // PDF file
            intent.setDataAndType(url, "application/pdf")
        } else if (url.toString().contains(".ppt") || url.toString().contains(".pptx")) {
            // Powerpoint file
            intent.setDataAndType(url, "application/vnd.ms-powerpoint")
        } else if (url.toString().contains(".xls") || url.toString().contains(".xlsx")) {
            // Excel file
            intent.setDataAndType(url, "application/vnd.ms-excel")
        } else if (url.toString().contains(".zip") || url.toString().contains(".rar")) {
            // WAV audio file
            intent.setDataAndType(url, "application/x-wav")
        } else if (url.toString().contains(".rtf")) {
            // RTF file
            intent.setDataAndType(url, "application/rtf")
        } else if (url.toString().contains(".wav") || url.toString().contains(".mp3")) {
            // WAV audio file
            intent.setDataAndType(url, "audio/x-wav")
        } else if (url.toString().contains(".gif")) {
            // GIF file
            intent.setDataAndType(url, "image/gif")
        } else if (url.toString().contains(".jpg") || url.toString().contains(".jpeg") || url.toString().contains(".png")) {
            // JPG file
            intent.setDataAndType(url, "image/jpeg")
        } else if (url.toString().contains(".txt")) {
            // Text file
            intent.setDataAndType(url, "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(url, "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(url, "*/*")
        }

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

    }

错误：

No Activity found to handle Intent { act=android.intent.action.VIEW dat=/storage/emulated/0/xelion/xelion_temp.txt typ=text/plain flg=0x10000001 }

Answer 1

首先，/storage/emulated/0/xelion/xelion_temp.txt不是有效的Uri。 Use FileProvider to make your content available to other apps.

其次，您无法在Android 10（默认情况下）和Android R +（对于所有应用程序）上访问Environment.getExternalStorageDirectory()。当您切换为使用FileProvider时，您将能够切换为将数据存储在getCacheDir()或Context提供的类似位置。

此外，您的第二个代码段中存在错误：

它将认为this.is.not.a.ppt.txt是PowerPoint演示文稿
它使用通配符MIME类型，但内容的供应商不能使用

并且请记住，并不需要每个Android设备都具有支持每种可能的内容类型的应用。

除了图片以外的其他文件，Pixel3 ACTION_VIEW无法启动

1 个答案: