public void onSurfaceChanged(GL10 gl, int width, int height) {
   CanvasJNI.surfaceChanged(width, height);
 }
 public void onSurfaceCreated(GL10 gl, EGLConfig config) {
   CanvasJNI.surfaceCreated();
 }
 public void onDrawFrame(GL10 gl) {
   CanvasJNI.render();
 }