How can I open a file from a byte array in android?

I have a byte array, filename with type (like xx.pdf, yy.txt) of file. I want to open a file with these parameters. I tried to save space and open it. But it didn't work. I can save it using FileOutputStream, but I need to convert it to File to open it. Please find my code below.

       public void ViewFile(String fileName,String base64File) throws IOException {

            FileOutputStream fos = openFileOutput(fileName,Context.MODE_PRIVATE);
            fos.write(base64File.getBytes());

            fos.close();

            // here is the code to open file and i have to send as 'File'
           // openFile(getApplicationContext(),file);

    }

  public void openFile(Context context, File url) throws IOException {
    // Create URI

    Uri uri = Uri.fromFile(url);

    Intent intent = new Intent(Intent.ACTION_VIEW);
    // Check what kind of file you are trying to open, by comparing the url with extensions.
    // When the if condition is matched, plugin sets the correct intent (mime) type,
    // so Android knew what application to use to open the file
    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);
    context.startActivity(intent);
}