requestFeature with action bar

问题:

So I was looking at google's api demos for action bars and they have this

// The Action Bar is a window feature. The feature must be requested
    // before setting a content view. Normally this is set automatically
    // by your Activity's theme in your manifest. The provided system
    // theme Theme.WithActionBar enables this for you. Use it as you would
    // use Theme.NoTitleBar. You can add an Action Bar to your own themes
    // by adding the element <item name="android:windowActionBar">true</item>
    // to your style definition.
    getWindow().requestFeature(Window.FEATURE_ACTION_BAR);

but when I tried to add the last line of code getWindow().requestFeature(Window.FEATURE_ACTION_BAR); My app just dies on start up. So what does it really do?

回答1:

The secret is the order of the callings.The requestfeature must be called before fill nothing. I do it in this order and works fine:

getWindow().requestFeature(Window.FEATURE_ACTION_BAR);
super.onCreate(savedInstanceState);
getSupportActionBar().hide();
setContentView(R.layout.your_activity_layout);

回答2:

I know this is very late, did you try

requestWindowFeature(Window.FEATURE_ACTION_BAR)