GLSurfaceView.Renderer class.

package dd.ww;

import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.opengles.GL10;
import android.content.Context;
import android.opengl.GLES20;
import android.opengl.GLSurfaceView.Renderer;
import android.opengl.Matrix;

public class Render implements Renderer {

    private Context context;
    private Cube cube;

    private float[] modelViewProjectionMatrix = new float[16];
    private float[] projectionMatrix = new float[16];
    private float[] viewMatrix = new float[16];
    private float[] rotationMatrix = new float[16];
    private float angle = 0f;

    public Render(Context context) {
        this.context = context;
    }

    @Override
    public void onSurfaceCreated(GL10 unused, EGLConfig config) {
        GLES20.glClearColor(1f, 1f, 1f, 1f);
        cube = new Cube(context);
    }

    @Override
    public void onSurfaceChanged(GL10 unused, int width, int height) {
        GLES20.glViewport(0, 0, width, height);
        float ratio = (float) width / (float) height;
        Matrix.frustumM(projectionMatrix, 0, -3f, 3f, -3f, 3f, 1f, 10f);
    }

    @Override
    public void onDrawFrame(GL10 unused) {
        GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT | GLES20.GL_DEPTH_BUFFER_BIT);
        //Camera position
        Matrix.setLookAtM(viewMatrix, 0, 0f, 0f, -4f, 0f, 0f, 0f, 0f, 1f, 0f);
        // projection x view = modelView
        Matrix.multiplyMM(modelViewProjectionMatrix, 0, projectionMatrix, 0, viewMatrix, 0);
        //Creating rotation matrix
        Matrix.setRotateM(rotationMatrix, 0, angle, 0f, 0f, -1f);
        //rotation x camera = modelView
        Matrix.multiplyMM(modelViewProjectionMatrix, 0, rotationMatrix, 0, modelViewProjectionMatrix, 0);
        Matrix.setRotateM(rotationMatrix, 0, angle, 0f, -1f, 0f);
        Matrix.multiplyMM(modelViewProjectionMatrix, 0, rotationMatrix, 0, modelViewProjectionMatrix, 0);
        Matrix.setRotateM(rotationMatrix, 0, angle, -1f, 0f, 0f);
        Matrix.multiplyMM(modelViewProjectionMatrix, 0, rotationMatrix, 0, modelViewProjectionMatrix, 0);

        cube.draw(modelViewProjectionMatrix);

        angle += 0.7f;
        if (angle > 360f)
            angle = 0f;
    }

}