java - Change Vertex massive in Renderer class from MainActivity onTouchEvent -

i newbie in android developement , thi question, how can change vertex massive inside class "mainrenderer" inside class "ship" mainactivity ontouchevent?

here code: mainactivity.java:

package com.example.galaga2d;  import android.opengl.glsurfaceview; import android.os.bundle; import android.app.activity; import android.view.motionevent; import android.view.window; import android.view.windowmanager; import android.widget.toast;  public class mainactivity extends activity {     //private boolean istouch = false;      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);          // Убираем тайтл приложения, тобишь делаем его fullscreen         requestwindowfeature(window.feature_no_title);         getwindow().setflags(windowmanager.layoutparams.flag_fullscreen,                         windowmanager.layoutparams.flag_fullscreen);          // Создаём новый surface и устанавливаем mainrenderer         glsurfaceview view = new glsurfaceview(this);         view.setrenderer(new mainrenderer());         view.setrendermode(glsurfaceview.rendermode_when_dirty);         setcontentview(view);      }      @override     public boolean ontouchevent(motionevent event) {         int x = (int) event.getx();         int y = (int) event.gety();         int upx = (int) event.getx();         int upy = (int) event.gety();         int downx = (int) event.getx();         int downy = (int) event.gety();          int eventaction = event.getaction();          switch (eventaction) {          case motionevent.action_down:              toast.maketext(this, "ВНИЗ "+"x: "+x+" y: "+y, toast.length_short).show();                break;          case motionevent.action_move:              toast.maketext(this, "ДВИЖЕНИЕ "+"x: "+x+" y: "+y, toast.length_short).show();              break;          case motionevent.action_up:              toast.maketext(this, "ВВЕРХ "+"x: "+x+" y: "+y, toast.length_short).show();              break;          }          return true;      }  } 

and mainrenderer.java:

package com.example.galaga2d;  import java.nio.bytebuffer; import java.nio.floatbuffer; import java.nio.byteorder; import javax.microedition.khronos.egl.eglconfig; import javax.microedition.khronos.opengles.gl10; import android.opengl.glsurfaceview.renderer;   public class mainrenderer implements renderer {     public int playersize = 0;     private ship playership = new ship();     private astedoid enemyastedoid = new astedoid();      @override     public void onsurfacecreated(gl10 gl, eglconfig config) {         gl.glclearcolor(1.0f, 0.0f, 0.0f, 1.0f);      }      @override     public void ondrawframe(gl10 gl) {         gl.glclear(gl10.gl_color_buffer_bit | gl10.gl_depth_buffer_bit);         playership.draw(gl);         enemyastedoid.draw(gl);     }      @override     public void onsurfacechanged(gl10 gl, int width, int height) {         gl.glviewport(0, 0, width, height);         gl.glmatrixmode(gl10.gl_projection);         gl.glloadidentity();         gl.glorthof(0, width, height, 0, 1, -1);         gl.glmatrixmode(gl10.gl_modelview);     }  // --------------------------------------------------------------------------------      class ship {         public int health = 100;         public int life = 3;          public floatbuffer shipvertexbuffer;          public float shipverticles[] = {             5, 5,       // лево низ             5, 10,      // лево вверх             10, 5,      // право низ             10, 10      // право вверх         };         public ship() {             bytebuffer bb = bytebuffer.allocatedirect(36);             bb.order(byteorder.nativeorder());             shipvertexbuffer = bb.asfloatbuffer();             shipvertexbuffer.put(shipverticles);             shipvertexbuffer.position(0);         }          public void draw(gl10 gl) {               gl.glcolor4f(0.0f, 1.0f, 0.0f, 1.0f);               gl.glvertexpointer(2, gl10.gl_float, 0, shipvertexbuffer);               gl.gldrawarrays(gl10.gl_triangle_strip, 0, 4);         }      }      class astedoid {         public int health = 100;         public int life = 3;          public floatbuffer asteroidcolorbuffer;         public floatbuffer asteroidvertexbuffer;          public float asteroidverticles[] = {                 25, 25,     // лево низ                 25, 30,     // лево вверх                 30, 25,     // право низ                 30, 30      // право вверх             };         public astedoid() {             bytebuffer bb = bytebuffer.allocatedirect(36);             bb.order(byteorder.nativeorder());             asteroidvertexbuffer = bb.asfloatbuffer();             asteroidvertexbuffer.put(asteroidverticles);             asteroidvertexbuffer.position(0);         }          public void draw(gl10 gl) {               gl.glcolor4f(0.0f, 0.0f, 1.0f, 1.0f);               gl.glvertexpointer(2, gl10.gl_float, 0, asteroidvertexbuffer);               gl.gldrawarrays(gl10.gl_triangle_strip, 0, 4);         }      }    // --------------------------------------------------------------------------------  } 

i want this, create variable "objectsize" , give value 5 in main activity ontouchevent on "case motionevent.action_down", example:

case motionevent.action_down:  objectsize = 5;  break; 

than want use variable change size of drawing object in mainrenderer in class ship, example:

public float shipverticles[] = {     5*objectsize , 5*objectsize,     5*objectsize, 10*objectsize,     10*objectsize, 5*objectsize,         10*objectsize, 10*objectsize     }; 

how can this? thx!