킷캣부터 가능할 겁니다.
Translucent Status Bar로 검색하면 아래같은 자료 나올껍니다.
>>>onCreate...액티비티에 뷰 등록전에 호출
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
}
>>>values-v19/styles.xml
<style name="ActivityTranslucent" parent="AppBaseTheme">
<item name="android:windowTranslucentStatus">true</item>
<item name="android:windowBackground">@android:color/transparent</item>
<item name="android:colorBackgroundCacheHint">@null</item>
<item name="android:windowIsTranslucent">true</item>
<item name="android:windowAnimationStyle">@android:style/Animation</item>
<item name="android:windowNoTitle">true</item>
<item name="android:windowContentOverlay">@null</item>
<item name="android:backgroundDimEnabled">false</item>
</style>