android.util.AndroidRuntimeException： requestFeature() must be called before adding content 错误解决方法

解决如下：
protected void onCreate(Bundle savedInstanceState) {
this.requestWindowFeature(Window.FEATURE_NO_TITLE);//去掉标题栏
this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);//去掉信息栏
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}