Android 设置应用全屏的两种解决方法

package com.android.tutor; 
import android.app.Activity; 
import android.os.Bundle; 
import android.view.Window; 
import android.view.WindowManager; 
public class OpenGl_Lesson1 extends Activity { 
    public void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
       //无title   
       requestWindowFeature(Window.FEATURE_NO_TITLE);   
        //全屏   
       getWindow().setFlags(WindowManager.LayoutParams. FLAG_FULLSCREEN , WindowManager.LayoutParams. FLAG_FULLSCREEN);
        //此两段代码必须设置在setContentView()方法之前
        setContentView(R.layout.main); 
    } 
} 

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
      package="com.android.tutor" 
      android:versionCode="1" 
      android:versionName="1.0"> 
    <application android:icon="@drawable/icon" android:label="@string/app_name"> 
        <activity android:name=".OpenGl_Lesson1" 
                  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="7" /> 
</manifest>