问SMS管理器正在发送多条sms

EN

private void sendSMS(String phoneNumber, String message)
{
        PendingIntent pi = PendingIntent.getActivity(this, 0,
                new Intent(this, MainActivity.class), 0);
        SmsManager sms = SmsManager.getDefault();
        sms.sendTextMessage(phoneNumber, null, message, pi, null);

}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    String msg = "some text";
    sendSMS("xxxxxxxxx", msg);
}