设置界面的显示时间

 protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        requestWindowFeature(Window.FEATURE_NO_TITLE);        setContentView(R.layout.activity_main);        new Handler().postDelayed(new Runnable() {            @Override            public void run() {                Intent mainIntent = new Intent(MainActivity.this,                        ShowActivity.class);                startActivity(mainIntent);                finish();            }        }, 2000);   }