public void createTextFile(String fileName) {
try {
    File notesDirectory = new File(Environment.getExternalStorageDirectory(), "Text Files");
    if (!notesDirectory.exists()) {
        notesDirectory.mkdirs();
    }
    File textFile = new File(notesDirectory, fileName);
    FileWriter writer = new FileWriter(textFile);
    writer.append("Sample Content");
    writer.flush();
    writer.close();
    Toast.makeText(this, "File Created at "+textFile.getAbsolutePath(), Toast.LENGTH_SHORT).show();
    } catch (IOException e) {
        e.printStackTrace();
    }
}