A simple example of using an Android Renderer to illustrate OpenGL ES boilerplate.

GraphicGlDemoActivity.java

/* GraphicGlDemoActivity.java
 * Author: Yong Bakos
 * Since: 11/26/2012
 * Thanks to:
 * Cube: http://intransitione.com/blog/create-a-spinning-cube-with-opengl-es-and-android/
 * OpenGL Boilerplate: http://www.jayway.com/2009/12/03/opengl-es-tutorial-for-android-part-i/
 */
package com.humanoriented.sudoku;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;

import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.opengles.GL10;

import android.app.Activity;
import android.opengl.GLSurfaceView;
import android.opengl.GLSurfaceView.Renderer;
import android.opengl.GLU;
import android.os.Bundle;
import android.view.Window;
import android.view.WindowManager;

public class GraphicGlDemoActivity extends Activity {

	public class DemoRenderer implements Renderer {
		
		private Cube cube = new Cube();
		private float rotation;
		
		@Override
		public void onSurfaceCreated(GL10 gl, EGLConfig config) {
		     gl.glClearColor(0.0f, 0.0f, 0.0f, 0.5f); 
		     // 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);
		}

		@Override
		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 window
			GLU.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();
		}
		
		@Override
		public void onDrawFrame(GL10 gl) {
			gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
			gl.glLoadIdentity();
                        gl.glTranslatef(0.0f, 0.0f, -10.0f);
                        gl.glRotatef(rotation, 1.0f, 1.0f, 1.0f);
                        cube.draw(gl);
                        gl.glLoadIdentity();                                    
                        rotation -= 0.15f; 
		}
	
	}

	class Cube {
        
	    private FloatBuffer mVertexBuffer;
	    private FloatBuffer mColorBuffer;
	    private ByteBuffer  mIndexBuffer;
	        
	    private float vertices[] = {
	                                -1.0f, -1.0f, -1.0f,
	                                1.0f, -1.0f, -1.0f,
	                                1.0f,  1.0f, -1.0f,
	                                -1.0f, 1.0f, -1.0f,
	                                -1.0f, -1.0f,  1.0f,
	                                1.0f, -1.0f,  1.0f,
	                                1.0f,  1.0f,  1.0f,
	                                -1.0f,  1.0f,  1.0f
	                                };
	    private float colors[] = {
	                               0.0f,  1.0f,  0.0f,  1.0f,
	                               0.0f,  1.0f,  0.0f,  1.0f,
	                               1.0f,  0.5f,  0.0f,  1.0f,
	                               1.0f,  0.5f,  0.0f,  1.0f,
	                               1.0f,  0.0f,  0.0f,  1.0f,
	                               1.0f,  0.0f,  0.0f,  1.0f,
	                               0.0f,  0.0f,  1.0f,  1.0f,
	                               1.0f,  0.0f,  1.0f,  1.0f
	                            };
	   
	    private byte indices[] = {
	                              0, 4, 5, 0, 5, 1,
	                              1, 5, 6, 1, 6, 2,
	                              2, 6, 7, 2, 7, 3,
	                              3, 7, 4, 3, 4, 0,
	                              4, 7, 6, 4, 6, 5,
	                              3, 0, 1, 3, 1, 2
	                              };
	                
	    public Cube() {
	            ByteBuffer byteBuf = ByteBuffer.allocateDirect(vertices.length * 4);
	            byteBuf.order(ByteOrder.nativeOrder());
	            mVertexBuffer = byteBuf.asFloatBuffer();
	            mVertexBuffer.put(vertices);
	            mVertexBuffer.position(0);
	                
	            byteBuf = ByteBuffer.allocateDirect(colors.length * 4);
	            byteBuf.order(ByteOrder.nativeOrder());
	            mColorBuffer = byteBuf.asFloatBuffer();
	            mColorBuffer.put(colors);
	            mColorBuffer.position(0);
	                
	            mIndexBuffer = ByteBuffer.allocateDirect(indices.length);
	            mIndexBuffer.put(indices);
	            mIndexBuffer.position(0);
	    }

	    public void draw(GL10 gl) {             
	            gl.glFrontFace(GL10.GL_CW);
	            
	            gl.glVertexPointer(3, GL10.GL_FLOAT, 0, mVertexBuffer);
	            gl.glColorPointer(4, GL10.GL_FLOAT, 0, mColorBuffer);
	            
	            gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
	            gl.glEnableClientState(GL10.GL_COLOR_ARRAY);
	             
	            gl.glDrawElements(GL10.GL_TRIANGLES, 36, GL10.GL_UNSIGNED_BYTE, 
	                            mIndexBuffer);
	                
	            gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);
	            gl.glDisableClientState(GL10.GL_COLOR_ARRAY);
	    }
	}
	
	@Override
	public void onCreate(Bundle state) {
		super.onCreate(state);
		requestWindowFeature(Window.FEATURE_NO_TITLE);
                getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
		GLSurfaceView view = new GLSurfaceView(this);
   		view.setRenderer(new DemoRenderer());
   		setContentView(view);
	}
	
}

thank you!

Thanks a lot

thank you
how can draw bitmap in GLSurfaceView ?

I'm using Android Studio and can't figure out how Java classes are supposed to correspond to UI components. Do you have any pointers? I'd appreciate any help.

You’re so helpful!