protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.first_layout);}
其中requestWindowFeature(Window.FEATURE_NO_TITLE)的意思就是不在活动中显示标题栏，注意这句代码一定要在setContentView()之前执行，不然会报错
原文：http://www.cnblogs.com/rainhome/p/5325694.html