Android: Get file name and extension of any file

Question

The issue I have, is that i can\'t extract the file exetension from files choosen on a smartphone with Android 9. The problem doesn\'t appear on devices with Android 8 or le

Answer 1

For the solution I am using the MediaStore to extract the name and extension of a choosen file. So I replace code in onActivityResult with following code:

String path = new File(data.getData().getPath()).getAbsolutePath();

if(path != null){
  uri = data.getData();

  String filename;
  Cursor cursor = getContentResolver().query(uri,null,null,null,null);
  
  if(cursor == null) filename=uri.getPath();
  else{
    cursor.moveToFirst();
    int idx = cursor.getColumnIndex(MediaStore.Files.FileColumns.DISPLAY_NAME);
    filename = cursor.getString(idx);
    cursor.close();
  }

  String name = filename.substring(0,filename.lastIndexOf("."));
  String extension = filename.substring(filename.lastIndexOf(".")+1);
}

So with MediaStore.File.FileColumns.DISPLAY_NAME it's possible to get the file name and extension from any file choosen with a file chooser.