requestWindowFeature(Window.FEATURE_NO_TITLE);//隐藏标题栏
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);//隐藏状态栏

android:theme="@android:style/Theme.NoTitleBar.Fullscreen" // 不显示应用程序标题栏，并全屏 
android:theme="Theme.Light.NoTitleBar.Fullscreen" // 白色背景，无标题栏，全屏
android:theme="Theme.Black.NoTitleBar.Fullscreen" // 黑色背景，无标题栏，全屏

<resources> 
<style name="Theme.NoTitle_FullScreen"> <!--自定义主题名称-->
<item name="android:windowNoTitle">true</item> 
<item name="android:windowFullscreen">true</item> 
</style> 
</resources>

android:theme="@style/Theme.NoTitle_FullScree"