Android 每隔3s更新一次title

MainActivity.java

public class MainActivity extends Activity {
    private static int i=0;

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

        Timer timer=new Timer();
        timer.scheduleAtFixedRate(new MyTask(), 100, 3000);
    }

    private Handler myHandler=new Handler(){
        public void handleMessage(Message msg){
            switch(msg.what){
            case 100:
                setTitle("Welcome to here "+i);
                i++;
                break;
            }
        }
    };

    private class MyTask extends TimerTask{
        public void run(){
            myHandler.obtainMessage(100).sendToTarget();
        }
    }
}