class WaitTask extends AsyncTask<Void, String, Void> {
	String prompt;
	String anim;
	public WaitTask(String prompt) {
		this.prompt = prompt;
		this.anim = " /";
	}
	@Override
	protected Void doInBackground(Void... params) {
		try {
			while(true) {
				if (isCancelled()) return null;
				TimeUnit.SECONDS.sleep(1);
				anim = anim.equals(" /") ? " \" : " /";
				publishProgress(anim);
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}
	@Override
	protected void onProgressUpdate(String... values) {
		super.onProgressUpdate(values);
		txtWait.setText(prompt + values[0]);
	}
	@Override
	protected void onPostExecute(Void result) {
		super.onPostExecute(result);
	}
	@Override
	protected void onCancelled() {
		super.onCancelled();
		txtWait.setText("");
	}
}

TimeUnit.SECONDS.sleep(1);

TimeUnit.SECONDS.sleep(1);

class WaitTimer {
		private Timer timer = null;
		public WaitTimer(String prompt) {
			if(timer != null) {
				timer.cancel();
			}
			timer = new Timer();
			WaitTimerTask timerTask = new WaitTimerTask(prompt);
			timer.schedule(timerTask, 0, 1000);
		}
		public void cancel() {
			if(timer != null) {
				timer.cancel();
			}
			txtWait.setText("");
		}
	}
	class WaitTimerTask extends TimerTask {
		String prompt;
		String dots;
		public WaitTimerTask(String prompt) {
			super();
			this.prompt = prompt;
			this.dots = " ...";
		}
		@Override
		public void run() {
			dots = dots.equals(" .  ") ? " .. " : (dots.equals(" .. ") ? " ..." : " .  ");
			runOnUiThread(new Runnable() {
				@Override
				public void run() {
					txtWait.setText(prompt + dots);
				}
			});
		}
	}