private void saveFile(String fileName) {
    try {
        OutputStream outputStream = openFileOutput(Environment.getExternalStorageDirectory().getPath()+"/"+FILENAME, 0);
        OutputStreamWriter osw = new OutputStreamWriter(outputStream);
        osw.write(mEditText.getText().toString());
        osw.close();
    } catch (Throwable t) {
        Toast.makeText(getApplicationContext(),
                "Exception: " + t.toString(), Toast.LENGTH_LONG).show();
    }
}