1. 开启一个新的线程

     new Thread() {
                               @Override
                               public void run() {
                                   try {
                                       Thread.sleep(2000);
                                   } catch (InterruptedException e) {
                                       e.printStackTrace();
                                   }
                                   startActivity(new Intent(LeadActivity.this, WelcomeActivity.class));
                               }
                           }.start();
   

   　　

2. handler 加 postDelayed 

    handler.postDelayed(new Runnable() {
                               @Override
                               public void run() {
                                   startActivity(new Intent(LeadActivity.this, WelcomeActivity.class));
                               }
                           },3000);
                       }
   

   　　

3. 定时器  TimerTask  和 Timer

    TimerTask task = new TimerTask() {
                               @Override
                               public void run() {
                                   startActivity(new Intent(LeadActivity.this, WelcomeActivity.class));
                               }
                           };
                           Timer timer = new Timer();
                           timer.schedule(task,1000);
                       }
   

   　　

Android 延时执行任务的三种简单方法