Android，通过GLSurfaceView设置值

Question

我尝试通过GLSurfaceView将我的Activity中的值发送到Renderer，但是SurfaceView类中的对象存在一些问题。我想我无法通过我的活动直接访问渲染器，我已经尝试过了。 当我尝试设置值时，我在GLView类中得到一个null-Exception。

public class Activity extends Activity implements SeekBar.OnSeekBarChangeListener{
GLSurfaceView mGLView;
...

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.layout_1d);
    mGLView = (GLView)findViewById(R.id.surfaceView1D);

    mGLView = new GLView(this,10);
//      mGLView.mRenderer.var_in_Renderer=10;   //Test, but not Working!

     }
...
     public void onProgressChanged(SeekBar seekBar, int progress, boolean fromTouch) {
         mGLView.var_in_Renderer=progress;   //Not working
         mGLView.setProgress(progress);
     }
...
}

class GLView extends GLSurfaceView {
   MyGLRenderer mRenderer;

   void setProgress(int progress){
       mRenderer.var_in_Renderer=progress;   //Error!!!!!!!!!!!!!!!!
   }

   //Empty Constructor don't go, so I filled
   public GLView(Context context,int progress){
      super(context);
   }

   public GLView(Context context, AttributeSet attrs) {
      super(context,attrs);

      // Set the Renderer for drawing on the GLSurfaceView
      mRenderer = new MyGLRenderer();
      setRenderer(mRenderer);
      mRenderer.var_in_Renderer=10; //That would work, but is not what I need
   }
}

如何在渲染器中为变量设置值？