Android : Errors making async http request in timer thread

I'd like to send http requests every N seconds. The response should be shown is some textViews.

I got error that "Can't create handler inside thread that has not called Looper.prepare()"

My code is below:

    private void runTimer() {
    MyTimerTask myTask = new MyTimerTask();
    Timer myTimer = new Timer();
    myTimer.schedule(myTask, 3000, 1500);

}
class MyTimerTask extends TimerTask {
    public void run() {
        asyncGetRequest();
    }
}



private void asyncGetRequest(){
  new DownloadWebPageTask().execute("http://www.google.com");
}

 ....

//this method is called automatically after receiving http response
@Override
protected void onPostExecute(String result) {
    someTextView.setText("some text");
}

Thanks!!!