有时候我们在代码里隐藏了actionbar，在打开应用时，仍然短暂闪现下actionbar，用户体验很不好。
最简单的方法是 在AndroidManifest.xml中设置主题中配置不显示title或者action，即为：
<style name="NoTitle" parent="android:Theme.Holo.Light">
<item name="android:windowActionBar">true</item>
</style>
或者
<style name="NoTitle" parent="android:Theme.Holo.Light">
<item name="android:windowNoTitle">true</item>
</style>
但是有时候，你如果想显示actionbar，就不能在AndroidManifest.xml这么设置，我试过，做上述设置，就不能显示出actionbar了（这个我试的结果是这样，有可以显示的请给我回复），
这时，怎么解决这个问题呢，在stackoverflow看到有解决方案，这里贴出来：
Setting android:windowActionBar=false truly disables the ActionBar but then, as you say, getActionBar() returns null. This is solved by:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().requestFeature(Window.FEATURE_ACTION_BAR);
getActionBar().hide();
setContentView(R.layout.splash); // be sure you call this AFTER requestFeature
But now there is another problem. After putting windowActionBar=false in the theme, the Activity draws its normal Window Title instead of an ActionBar.
If we try to avoid this by using some of the *.NoTitleBar stock themes or we try to put true in our own theme, it won't work.
The reason is that the ActionBar depends on the Window Title to display itself - that is the ActionBar is a transformed Window Title.
So the trick which can help us out is to add one more thing to our Activity theme xml:
<item name="android:windowActionBar">false</item>
<item name="android:windowTitleSize">0dp</item>
This will make the Window Title with zero height, thus practically invisible .
In your case, after you are done with displaying the splash screen you can simply call
setContentView(R.layout.main);
getActionBar().show()
and you are done. The Activity will start with no ActionBar flickering, nor Window Title showing
