用Timer进行延迟的代码，例如从欢迎界面进入主界面会有一段延迟时间。

public class WelcomeActivity extends Activity {
 private ImageView welcomeiv;
 private TextView welcometv;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.welcome);
  final Handler handler = new Handler() {
   @Override
   public void handleMessage(Message msg) {
    switch (msg.what) {
    case 1:
     login();
     
     break;
    }
    super.handleMessage(msg);
   }
  };
  TimerTask task = new TimerTask() {
   @Override
   public void run() {
    Message message = new Message();
    message.what = 1;
    handler.sendMessage(message);
   }
  };
  Timer timer = new Timer(true);
  timer.schedule(task,2000); // 延时1000ms后执行，1000ms执行一次
  //timer.cancel(); //退出计时器
 }
 private void login(){
  final Handler handler = new Handler(){
   @Override
   public void handleMessage(android.os.Message msg) {
    switch (msg.what) {
   case 
//这里是根据返回值，分别作不一样的操做。
break;
    default:
     break;
    }
   }
  };
 }
}