android 打开app先显示欢迎界面后自动跳到主界面

 1     @Override
 2     protected void onCreate(Bundle savedInstanceState) {
 3         super.onCreate(savedInstanceState);
 4         setContentView(R.layout.activity_main);
 5         getSupportActionBar().hide();
 6         new Handler().postDelayed(new Runnable() {
 7             @Override
 8             public void run() {
 9                 Intent in = new Intent(MainActivity.this, ManagerActivity.class);
10                 startActivity(in);
11             }
12         }, 2000);
13     }

首先加载欢迎界面，欢迎界面加载完毕后，线程睡眠两秒，跳转主界面！