延迟启动MainActivity

//1定义splash显示时间
private static final int DELAY_TIME=3000;
//创建线程
new Handler().postDelayed(new Runnable(){
    public void run(){
        //延迟3秒，进入主界面
        startActivity(new Intent(SplashActivity.this,MainAcitvity.class));
        finish();//关闭当前页面
    }
},DELAY_TIME)