Android TextView Not Updating

Hey, everyone.
I'm trying to make a basic tycoon game for Android
and I'm trying to increment the value of text-views every 5 seconds with a timer,
But the textview doesn't update.
Here's my code so far:

public class Town extends Activity implements OnClickListener {
	Timer timer;
	TimerTask task;
	TextView goldTV;
	TextView woodTV;
	TextView foodTV;
	TextView stoneTV;
	TextView cashTV;
	int gold = 20;
	int wood = 20;
	int food = 20;
	int stone = 20;
	int cash = 200;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_town);
		goldTV = (TextView) findViewById(R.id.textView1);
		woodTV = (TextView) findViewById(R.id.TextView01);
		foodTV = (TextView) findViewById(R.id.TextView02);
		stoneTV = (TextView) findViewById(R.id.TextView03);
		cashTV = (TextView) findViewById(R.id.TextView04);
		timer = new Timer();
		task = new TimerTask() {
			
			@Override
			public void run() {
				gold++;
				goldTV.setText(gold);
				try {
					this.wait(2000);
				}
				catch (InterruptedException e){
				}
			}
			
		};
	}
	@Override
	public void onClick(View arg0) {
		// TODO Auto-generated method stub
		
	}
}