Create Brain Overdrive Game in Android

This is yet another game like the 123Game. This game generates a single character which may be a Vowel, a Consonant, an Odd Number or may be an Even Number. The theme is you will get 3 seconds for each questions, you have to select the right option for it. If selected the right one then you will get 3 marks and the game gets over if u opt a wrong one !

Screenshots[Demo]

The Code:
For Generating Characters:

void calc()
 {
  es="02468";os="13579";vs="AEIOU";ks="BCDFGHJKLMNPQRSTVWXYZ";k="";
  Random rand=new Random();
  k=k+es.charAt(rand.nextInt((4 - 0) + 1));
  k=k+os.charAt(rand.nextInt((4 - 0) + 1));
  k=k+vs.charAt(rand.nextInt((4 - 0) + 1));
  k=k+ks.charAt(rand.nextInt((20 - 0) + 1));
  String input=k;
  List<Character> characters = new ArrayList<Character>();
        for(char c:input.toCharArray()){
            characters.add(c);
        }
        StringBuilder output = new StringBuilder(input.length());
        while(characters.size()!=0){
            int randPicker = (int)(Math.random()*characters.size());
            output.append(characters.remove(randPicker));
        }
        igc=new CountDownTimer(4000,1000) {
   
   @Override
   public void onTick(long arg0) {
    t1.setText(((arg0/1000))+"Secs ");
    t2.setText("Score: "+score);
    
   }
   
   @Override
   public void onFinish() {
    // TODO Auto-generated method stub
    dt1.setText("You Cannot ");
    dt2.setText("Complete ?");
    dt3.setText("You Scored: "+score);
    ob.show();
    upd();
    
   }
  }.start();
        chk=output.toString().charAt(0)+"";
        t3.setText(chk);
 }

The OnClick Function

public void onClick(View v) {
  // TODO Auto-generated method stub
  if(v.getId()==R.id.Button01)
  {
    if(ks.contains(chk))
    {
     igc.cancel();
     score+=3;
     calc();
    }
    else
    {
     igc.cancel();
     dt1.setText("You Think "+chk);
     dt2.setText("as Consonant ?");
     dt3.setText("You Scored: "+score);
     ob.show();
     upd();
    }
  }
  else if(v.getId()==R.id.button5)
  {
   if(os.contains(chk))
    {
    igc.cancel();
    score+=3;
    calc();
    }
    else
    {
     igc.cancel();
     dt1.setText("You Think "+chk);
     dt2.setText("as ODD ?");
     dt3.setText("You Scored: "+score);
     ob.show();
     upd();
    }
  }
  else if(v.getId()==R.id.Button02)
  {
   if(es.contains(chk))
    {
    igc.cancel();
     score+=3;
     calc();
    }
    else
    {
     igc.cancel();
     dt1.setText("You Think "+chk);
     dt2.setText("as EVEN ?");
     dt3.setText("You Scored: "+score);
     ob.show();
     upd();
    }
  }
  else if(v.getId()==R.id.button6)
  {
   if(vs.contains(chk))
    {
    igc.cancel();
     score+=3;
     calc();
    }
    else
    {
     igc.cancel();
     dt1.setText("You Think "+chk);
     dt2.setText("as VOWEL ?");
     dt3.setText("You Scored: "+score);
     ob.show();
     upd();
    }
  }
  else if(v.getId()==R.id.button1)
  {
   //Drawable d=getResources().getDrawable(R.drawable.play);
   igc.cancel();
   bp.setVisibility(View.GONE);
   is = new Button(v.getContext());
   is.setBackgroundResource(R.drawable.play);
   is.setOnClickListener(new OnClickListener() {
    
    public void onClick(View arg0) {
     // TODO Auto-generated method stub
     calc();
     is.setVisibility(View.GONE);
     bp.setVisibility(View.VISIBLE);
    }
   });
   ll.addView(is);
  }
  else if(v.getId()==R.id.button2)
  {
   Intent i= new Intent(this,GameActivity.class);
   startActivity(i);
   finish();
  }
  else if(v.getId()==R.id.imageView2)
  {
   finish();
  }
  else if(v.getId()==R.id.imageView3)
  {
   Intent i= new Intent(this,GameActivity.class);
   startActivity(i);
   finish();
  }
 }

Alternatively you can download the whole ADT Project by clicking here.
Found Bugs, Comment them here !