package com.example.gltest;import javax.microedition.khronos.opengles.GL10;import android.opengl.EGLConfig;
import android.opengl.GLSurfaceView.Renderer;
import android.opengl.GLU;public class OpenGLRenderer implements Renderer {private final IOpenGLDemo openGLDemo;public OpenGLRenderer(IOpenGLDemo demo){openGLDemo=demo;}public void onSurfaceCreated(GL10 gl, EGLConfig config) {// Set the background color to black ( rgba ).gl.glClearColor(0.0f, 0.0f, 0.0f, 0.5f);// Enable Smooth Shading, default not really needed.
     gl.glShadeModel(GL10.GL_SMOOTH);// Depth buffer setup.gl.glClearDepthf(1.0f);// Enables depth testing.
     gl.glEnable(GL10.GL_DEPTH_TEST);// The type of depth testing to do.
     gl.glDepthFunc(GL10.GL_LEQUAL);// Really nice perspective calculations.
     gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT,GL10.GL_NICEST);}public void onDrawFrame(GL10 gl) {if(openGLDemo!=null){openGLDemo.DrawScene(gl);}}public void onSurfaceChanged(GL10 gl, int width, int height) {// Sets the current view port to the new size.gl.glViewport(0, 0, width, height);// Select the projection matrix
     gl.glMatrixMode(GL10.GL_PROJECTION);// Reset the projection matrix
     gl.glLoadIdentity();// Calculate the aspect ratio of the windowGLU.gluPerspective(gl, 45.0f,(float) width / (float) height,0.1f, 100.0f);// Select the modelview matrix
     gl.glMatrixMode(GL10.GL_MODELVIEW);// Reset the modelview matrix
     gl.glLoadIdentity();}@Overridepublic void onSurfaceCreated(GL10 arg0,javax.microedition.khronos.egl.EGLConfig arg1) {// TODO Auto-generated method stub
        }}

为简洁起见，为所有的示例定义了一个接口IOpenGLDemo，
定义在IOpenGLDemo.java

package com.example.gltest;import javax.microedition.khronos.opengles.GL10;public interface IOpenGLDemo {public void DrawScene(GL10 gl);}

DrawScene 用于实际的GL绘图示例代码，其它的初始化工作基本就由GLSurfaceView 和OpenGLRenderer 完成,其中onSurfaceCreated 和 onSurfaceChanged 中的代码含义现在无需了解，后面会有具体介绍，只要知道它们是用来初始化GLSurfaceView就可以了。

最后使用一个简单的例子“Hello World”结束本篇，“Hello World” 使用红色背景刷新屏幕。

MainActivity.java

package com.example.gltest;import javax.microedition.khronos.opengles.GL10;import android.opengl.GLSurfaceView;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.Window;
import android.view.WindowManager;public class MainActivity extends Activityimplements IOpenGLDemo{/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);this.requestWindowFeature(Window.FEATURE_NO_TITLE);getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);mGLSurfaceView = new GLSurfaceView(this);mGLSurfaceView.setRenderer(new OpenGLRenderer(this));setContentView(mGLSurfaceView);}public void DrawScene(GL10 gl) {gl.glClearColor(1.0f, 0.0f, 0.0f, 0.0f);// Clears the screen and depth buffer.
            gl.glClear(GL10.GL_COLOR_BUFFER_BIT| GL10.GL_DEPTH_BUFFER_BIT);}@Overrideprotected void onResume() {// Ideally a game should implement// onResume() and onPause()// to take appropriate action when the//activity looses focus
            super.onResume();mGLSurfaceView.onResume();}@Overrideprotected void onPause() {// Ideally a game should implement onResume()//and onPause()// to take appropriate action when the//activity looses focus
            super.onPause();mGLSurfaceView.onPause();}private GLSurfaceView mGLSurfaceView;}

结果如下：