Android ถามเรื่อง intent คนละ Activity (dialogbox) ใช้กับ google map

  iconclick1.setOnClickListener(new OnClickListener() {
				
				public void onClick(View v) {
					// TODO Auto-generated method stub
					Intent itn = new Intent(mainPoint.this,Main.class);

					itn.putExtra("number",1);
					startActivity(itn);
				}
			});

	double[]X = new double[30];
  		double[]Y = new double[30];
  		
       Intent itn =getIntent();
       int numberShop = 0;
       numberShop =  itn.getIntExtra("number", 0);
       
       if(numberShop == 1)
       {	
	   		
	   //atm test
     	   X[1]=13.80006913931402;
    	   Y[1]=100.55008258670568;
    	   Xo[1]=13.800020299602382;
    	   Yo[1]=100.55007923394442;
    	   
    	   for(int i=1;i<=1;i++)
    	   {
    	         mMap.addMarker(new MarkerOptions().position(
    	                 new LatLng(X[i], Y[i] ))
    	                 .icon(BitmapDescriptorFactory.defaultMarker(
    	                         BitmapDescriptorFactory.HUE_ROSE)));