android 全屏问题

//Activity中在加载 setContentView(R.layout.main);之前写  
    
  requestWindowFeature(Window.FEATURE_NO_TITLE);
       getWindow().setFlags(WindowManager.LayoutParams. FLAG_FULLSCREEN,
                      WindowManager.LayoutParams. FLAG_FULLSCREEN);

//AndroidManifest.XML中
<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android"   
      package="cn.fn" 
      android:versionCode="1"   
      android:versionName="1.0">  
    <application android:icon="@drawable/icon" android:label="@string/app_name">   
        <activity android:name=".MainActivity"  
                  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> 
    <uses-sdk android:minSdkVersion="8" />   
</manifest>