java - How to redraw opengl renderer after clicking button? -

i'm trying update glulookat() main ui thread of opengl renderer i've tryed requestrenderer() methode @ end of code button eclipes gives me sme errors wondering best possible way main ui thread?

heres mainactivity class:

public class mainactivity extends activity implements onclicklistener { glsurfaceview oursurface; glrenderer call; @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     oursurface = new surfaceview(this);     setcontentview(r.layout.activity_main);     framelayout v = (framelayout) findviewbyid(r.id.canvas);     v.addview(oursurface); } @override public void onclick(view v) {     // todo auto-generated method stub     switch (v.getid()){     case r.id.pluseyex:         break;     case r.id.minuseyex:       break;         case r.id.pluseyey:         break;     case r.id.minuseyey:         break;     case r.id.pluseyez:         float z =call.geteyez()+1;         call.seteyez(z);           break;     case r.id.minuseyez:         break;     }   } 

here renderer:

public class surfaceview extends glsurfaceview {  private final glrenderer mrenderer;  public surfaceview(context context) {     super(context);     // todo auto-generated constructor stub     mrenderer = new glrenderer();     setrenderer(mrenderer);     setrendermode(glsurfaceview.rendermode_when_dirty); }  public class glrenderer implements renderer {      public volatile float eyez =-5;        public float geteyez() {         return eyez;     }      public void seteyez(float eyez) {         this.eyez = eyez;     }      private gltriex tri;     //private glcubeex cube;     public glrenderer(){         tri = new gltriex();         //cube = new glcubeex();     }      @override     public void onsurfacecreated(gl10 gl, eglconfig eglconfig) {         // todo auto-generated method stub         gl.gldisable(gl10.gl_dither);         gl.glhint(gl10.gl_perspective_correction_hint, gl10.gl_fastest);         gl.glclearcolor(.8f, 0f, .2f, 1f);         gl.glcleardepthf(1f);     }      @override     public void ondrawframe(gl10 gl) {         // todo auto-generated method stub         gl.gldisable(gl10.gl_dither);         gl.glclear(gl10.gl_color_buffer_bit | gl10.gl_depth_buffer_bit);          gl.glmatrixmode(gl10.gl_modelview);         gl.glloadidentity();         glu.glulookat(gl, 0, 0, -5, 0, 0, 0, 0, 2, 0);          //long time = systemclock.uptimemillis()% 4000l;         //float angle =.090f * ((int)time);         //gl.glrotatef(angle, 1, 0, 2);          tri.draw(gl);         //cube.draw(gl);     }      @override     public void onsurfacechanged(gl10 gl, int width, int height) {         // todo auto-generated method stub         gl.glviewport(0, 0, width, height);//bottom left corrnor         float ratio = (float) width/height;         gl.glmatrixmode(gl10.gl_projection);         gl.glloadidentity();         gl.glfrustumf(-ratio, ratio, -1, 1, 1, 25);         //gl.glfrustumf(left, right, bottom, top, znear, zfar)      }    }   } 

you're not using eyez value anywhere in renderer.

i think want replace

glu.glulookat(gl, 0, 0, -5, 0, 0, 0, 0, 2, 0);

by

glu.glulookat(gl, 0, 0, eyez, 0, 0, 0, 0, 2, 0);

to see effect pressing button.