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public void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
//取消标题 
requestWindowFeature(Window.FEATURE_NO_TITLE); 
//取消状态栏
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, 
WindowManager.LayoutParams.FLAG_FULLSCREEN); 
setContentView(R.layout.main); 
}

<?xml version="1.0" encoding="utf-8"?> 
<resources> 
<!-- name 是Style的名称，parent 继承那个父类样式 --> 
<style name="theme_fullScreen" parent="android:Theme.Black"> 
<item name="android:windowNoTitle">true</item> <!-- 设置无标题 --> 
<item name="android:windowFullscreen">?android:windowNoTitle</item> <!-- 是否填充慢屏幕，引用android:windowNoTitle 的值 ?android:windowNoTitle，取决于android:windowNoTitle的值-->
</style> 
</resources>

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
package="com.andyidea" 
android:versionCode="1" 
android:versionName="1.0"> 
<uses-sdk android:minSdkVersion="8" /> 
<application android:icon="@drawable/icon" android:label="@string/app_name"> 
<activity android:name=".login.LoginActivity" 
android:theme="@android :style/Theme.NoTitleBar.Fullscreen" 
android:label="@string/app_name"> 
<intent-filter> 
<action android:name="android.intent.action.MAIN" /> 
<category android:name="android.intent.category.LAUNCHER" /> 
</intent-filter> 
</activity> 
</application> 
</manifest> 

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

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