一.Timer 跳轉

 final Intent intent = new Intent(this, MainActivity.class);//你要轉向的Activity 
        Timer timer = new Timer();
        TimerTask timerTask = new TimerTask() {
            @Override
            public void run() {
                startActivity(intent); //執行
            }
        };
        timer.schedule(timerTask,1000*5);//五秒跳轉