File path = new File(Environment.getExternalStorageDirectory(), "Folder");
if (!path.exists()) {
    path.mkdirs();
}

File exportFile = new File(path, fileName);
FileWriter writer = new FileWriter(exportFile);
writer.append(body);
writer.flush();
writer.close();

Intent intent = new Intent();
intent.setAction(Intent.ACTION_SEND);
intent.setType("text/plain");
intent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(exportFile));
startActivity(intent);

File path = new File(this.getFilesDir(), "exports");
if(!path.exists()){
    path.mkdir();
}