I have a GLSurfaceView class that must show a square with a texture.
I'm trying to fit the screen with the texture/polygon dimensions, then
i need to use projections.

I'm using 3 classes to have compatibility with android 1.5:

MatrixGrabber.java MatrixStack.java MatrixTrackingGL.java

This is the part of the code that it is giving the error:

private MatrixGrabber mg = new MatrixGrabber(); //create the matrix
grabber object in your initialization code
.
.
.
DisplayMetrics dm = new DisplayMetrics();

((Activity)context).getWindowManager().getDefaultDisplay().getMetrics(dm);
        screenW=dm.widthPixels;
        screenH=dm.heightPixels;

        modelMatrix=mg.mModelView;
        projMatrix=mg.mProjection;
        mView[0] = 0;
        mView[1] = 0;
        mView[2] = screenW; //width
        mView[3] = screenH; //height
.
.
.
public void onDrawFrame(GL10 gl) {
        //Clear Screen And Depth Buffer
        gl.glClear(GL10.GL_COLOR_BUFFER_BIT |
GL10.GL_DEPTH_BUFFER_BIT);
        gl.glLoadIdentity();                    //Reset The Current
Modelview Matrix

        mg.getCurrentProjection(gl);
        mg.getCurrentModelView(gl);
.
.
.

And this is the error:

    02-17 09:13:59.952: WARN/dalvikvm(11405): threadid=8: thread
exiting with uncaught exception (group=0x4001d7e0)
02-17 09:13:59.960: ERROR/AndroidRuntime(11405): FATAL EXCEPTION:
GLThread 9
02-17 09:13:59.960: ERROR/AndroidRuntime(11405):
java.lang.ClassCastException: com.google.android.gles_jni.GLImpl
02-17 09:13:59.960: ERROR/AndroidRuntime(11405):     at
com.DemoMagazine.MatrixGrabber.getMatrix(MatrixGrabber.java:56)
02-17 09:13:59.960: ERROR/AndroidRuntime(11405):     at
com.DemoMagazine.MatrixGrabber.getCurrentProjection(MatrixGrabber.java:
52)
02-17 09:13:59.960: ERROR/AndroidRuntime(11405):     at
com.DemoMagazine.SquareGLSurfaceView.onDrawFrame(SquareGLSurfaceView.java:
112)
02-17 09:13:59.960: ERROR/AndroidRuntime(11405):     at
android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:
1332)
02-17 09:13:59.960: ERROR/AndroidRuntime(11405):     at
android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1116)