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>