extend GLSurfaceView and Renderer

AndroidManifest.xml

@@ -12,4 +12,5 @@
             </intent-filter>
         </activity>
     </application>
+    <uses-feature android:glEsVersion="0x00020000" android:required="true" />
 </manifest>

src/com/homelinux/holtrop/opengltest/MainOpenGL.java

@@ -1,15 +1,20 @@
 package com.homelinux.holtrop.opengltest;
 
+import android.opengl.GLSurfaceView;
 import android.app.Activity;
 import android.os.Bundle;
 
 public class MainOpenGL extends Activity
 {
+    private GLSurfaceView mGLView;
+
     /** Called when the activity is first created. */
     @Override
     public void onCreate(Bundle savedInstanceState)
     {
         super.onCreate(savedInstanceState);
-        setContentView(R.layout.main);
+
+        mGLView = new MyGLSurfaceView(this);
+        setContentView(mGLView);
     }
 }

src/com/homelinux/holtrop/opengltest/MyGLSurfaceView.java

@@ -0,0 +1,16 @@
+package com.homelinux.holtrop.opengltest;
+
+import android.opengl.GLSurfaceView;
+import android.content.Context;
+
+public class MyGLSurfaceView extends GLSurfaceView
+{
+    public MyGLSurfaceView(Context context)
+    {
+        super(context);
+
+        setRenderer(new MyRenderer());
+
+        setEGLContextClientVersion(2);
+    }
+}

src/com/homelinux/holtrop/opengltest/MyRenderer.java

@@ -0,0 +1,24 @@
+package com.homelinux.holtrop.opengltest;
+
+import android.opengl.GLSurfaceView;
+import android.opengl.GLES20;
+import javax.microedition.khronos.opengles.GL10;
+import javax.microedition.khronos.egl.EGLConfig;
+
+public class MyRenderer implements GLSurfaceView.Renderer
+{
+    public void onSurfaceCreated(GL10 unused, EGLConfig config)
+    {
+        GLES20.glClearColor(0.5f, 0.5f, 0.5f, 1.0f);
+    }
+
+    public void onDrawFrame(GL10 unused)
+    {
+        GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);
+    }
+
+    public void onSurfaceChanged(GL10 unused, int width, int height)
+    {
+        GLES20.glViewport(0, 0, width, height);
+    }
+}