timer.cancel()

                    alert.setPositiveButton("YES", new DialogInterface.OnClickListener() {

                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            Toast.makeText(getApplicationContext(),"Game is restarted",Toast.LENGTH_SHORT).show();

                            Intent intent= getIntent();
                            finish();
                            startActivity(intent);
                        }
                    });

                    alert.setNegativeButton("NO",new DialogInterface.OnClickListener(){

                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            Toast.makeText(getApplicationContext(),"Process cancelled",Toast.LENGTH_SHORT).show();

                            if(timeText.getText().toString().equals("Time's done !")){
                                disableImages(false);
                                timer.cancel();
                            }
                            else{
                                activateImages(true);
                                resumeTimer();
                            }
                        }
                    });

                    alert.setCancelable(false);

                    alert.show();
                }