requestFeature() must be called before adding content 解决方法

今天在做一个app引导界面的时候，想设置成全屏显示，一直报错aused by: android.util.AndroidRuntimeException: 
requestFeature() must be called before adding content，百度了很多都不行后来实在没办法了，Google了一下，终于解决了，由于我用的是Google最新的开发工具，继承的是ActionBarActivity,改成继承Activity 完美解决！！

//supportRequestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
        //取消标题
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        //取消状态栏
        this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);
         // 写在 super.onCreate(savedInstanceState);this.setContentView(R.layout.activity_main); 之前

public class MainActivity extends Activity {

    private ViewPager mPager;
    private ArrayList<View> mPageViews;
    private MyPagerAdapter mPageAdapter;

    private ViewPager mFramePager;
    private ArrayList<View> mFramePageViews;
    private MyPagerAdapter mFramePageAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        //supportRequestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
        //取消标题
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        //取消状态栏
        this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);
            
        super.onCreate(savedInstanceState);

        this.setContentView(R.layout.activity_main);
        initViewPager();


    }