While Open PDF file in android N it shows Black color blank Page

I have face one issue when opening Pdf file in my project

in my project i'm implemented PDF opening with notification type,while opening downloaded PDF file it shows blank page

   In manifeast file:

  <provider
    android:name="android.support.v4.content.FileProvider"
    android:authorities="${applicationId}.fileprovider"
    android:exported="false"
    android:grantUriPermissions="true"
    tools:replace="android:authorities">
    <meta-data
        android:name="android.support.FILE_PROVIDER_PATHS"
        android:resource="@xml/path_provider"
        tools:replace="android:resource"/>
</provider>

   path_provider:

  <?xml version="1.0" encoding="utf-8"?>
  <paths xmlns:android="http://schemas.android.com/apk/res/android">
  <external-path name="external_files" path="."/>
  </paths> 



public void customNotifcation1() {
getActivity().runOnUiThread(new Runnable() {
    @Override
    public void run() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {

            File file = new File(getActivity().getFilesDir(), pdfFileName);
            String absoluteFilePath = file.getAbsolutePath();

            Uri uri = Uri.parse("content://" + 
  getActivity().getPackageName() + "/" + absoluteFilePath);
            PendingIntent pendingIntent = null;
            CharSequence name = "Attendance";
            String description = uri + "";

            int importance = NotificationManager.IMPORTANCE_DEFAULT;
            NotificationChannel channel = new 
  NotificationChannel("Attendance", name, importance);
            channel.setDescription(description);
            NotificationManager notificationManager = 
  getActivity().getSystemService(NotificationManager.class);
            notificationManager.createNotificationChannel(channel);
            NotificationCompat.Builder notification = new 
  NotificationCompat.Builder(getActivity(), "Attendance")
                    .setContentTitle(name)
                    .setContentText(description)
                    .setAutoCancel(true)
                    .setSmallIcon(R.drawable.icon50);
            try {

                Intent intent = new Intent(Intent.ACTION_VIEW);
                intent.setDataAndType(uri, mimeType);
                intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
                intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                intent = Intent.createChooser(intent, "Choose Pdf 
  Application");
                //pendingIntent = PendingIntent.getActivity(getActivity(), 
 0, intent, 0);
                pendingIntent = PendingIntent.getActivity(getActivity(), 0, 
  intent, PendingIntent.FLAG_CANCEL_CURRENT);

            } catch (ActivityNotFoundException e) {
                Toast.makeText(getActivity(), "No Application Available to 
   fiew this file type", Toast.LENGTH_SHORT).show();
            } catch (Exception e) {
                e.printStackTrace();
                Log.e("Exception", e.toString());
            }


    notification.setLargeIcon(BitmapFactory.decodeResource(getResources(), 
  R.drawable.icon));
            notification.setContentIntent(pendingIntent);
            notificationManager.notify(1, notification.build());
        } else {
            PendingIntent pendingIntent = null;
            File file = null;
            NotificationCompat.Builder builder = new 
   NotificationCompat.Builder(getActivity());
             builder.setSmallIcon(R.drawable.icon50);

            try {
                file = new 
       File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/" + pdfFileName);
                file = new File(getActivity().getFilesDir(), pdfFileName);
                String absoluteFilePath = file.getAbsolutePath();

                Uri uri = Uri.parse("content://" + 
       getActivity().getPackageName() + "/" + absoluteFilePath);

                Intent intent = new Intent(Intent.ACTION_VIEW);
                intent.setDataAndType(uri, "application/pdf");
                // intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                // intent.setDataAndType(Uri.fromFile(file), 
  "application/pdf");
                // intent = Intent.createChooser(intent, "Open File");
                intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
                intent.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
                pendingIntent = PendingIntent.getActivity(getActivity(), 0, 
  intent, 0);

            } catch (ActivityNotFoundException e) {
                Toast.makeText(getActivity(), "No Application Available to 
  fiew this file type", Toast.LENGTH_SHORT).show();
            } catch (Exception e) {
                e.printStackTrace();
                Log.e("Exception", e.toString());
            }

            builder.setContentIntent(pendingIntent);

      builder.setLargeIcon(BitmapFactory.decodeResource(getResources(), 
 R.drawable.icon));
            builder.setContentTitle("Attendance");
            builder.setContentText(file + "");
            builder.setAutoCancel(true);

            NotificationManager notificationManager = (NotificationManager) 
 getActivity().getSystemService(NOTIFICATION_SERVICE);
            notificationManager.notify(1, builder.build());
        }
    }
});

}

from While Open PDF file in android N it shows Black color blank Page