TimeTask

import java.util.Timer;
import java.util.TimerTask;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		timer.schedule(task, 3000, 3000);
	}

	@Override
	protected void onDestroy() {
		timer.cancel();
		super.onDestroy();
	}

	private static final int timerAnimation = 1;
	private final Handler mHandler = new Handler() {
		public void handleMessage(android.os.Message msg) {
			switch (msg.what) {
			case timerAnimation:
				// xxxxxx
				break;
			default:
				break;
			}
		};
	};
	private final Timer timer = new Timer();
	private final TimerTask task = new TimerTask() {
		public void run() {
			mHandler.sendEmptyMessage(timerAnimation);
		}
	};
}