Looping A Method Many Times Causes Error

I am looping a method which returns DocumentFile for 100 or even more times . Many times the method returns null while it has already been looped for around 35 times. This is the m

Solution 1:

Inside the else part of your code and on the first line, you are creating a new DocumentFile just from the sd-card's URI and then on the second line, you try to find a file on the root directory of the sd-card which provides you nothing.

I can't guess the logic behind your else part after you getting null out of the user`s provided URI.

When you get null from this approach it means that the user has been selected a wrong directory as the sd-card. So the first thing you have to do is to ask the user to provide the correct path to the sd-card.

publicstatic DocumentFile documentfile(final File file ) {   
  for (UriPermission permissionUri : con.getContentResolver().getPersistedUriPermissions()) {   
        DocumentFilerootDocFile= DocumentFile.fromTreeUri(con, permissionUri.getUri());    
        String[] parts = (file.getPath()).split("/");    
          for (inti=3; i < parts.length; i++) {        
            if (rootDocFile != null) {
                rootDocFile = rootDocFile.findFile(parts[i]);
            }
            if (rootDocFile != null) {
                break;
            }
            //else {//    rootDocFile = DocumentFile.fromTreeUri(con, permissionUri.getUri());//    rootDocFile = rootDocFile.findFile(parts[i]);//}        
          }
      }
      return rootDocFile;
}

If rootDocFile is null then ask the user for the correct path

See my previous explanation here