<application android:icon="@drawable/icon"
android:label="@string/app_name"
android:theme="@android:style/Theme.NoTitleBar">可以看出，這樣寫的話，整個應用都會去掉標題欄，如果只想去掉某一個Activity的標題欄的話，可以把這個屬性加到activity標簽里面

<?xml version="1.0" encoding="UTF-8" ?>
<resources>
<style name="notitle">
<item name="android:windowNoTitle">true</item>
</style>
</resources>

<application android:icon="@drawable/icon"
android:label="@string/app_name"
android:theme="@style/notitle">

getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);

android:theme="@android:style/Theme.NoTitleBar.Fullscreen"

application android:icon="@drawable/icon"
android:label="@string/app_name"
android:theme="@style/fullscreem"