...

EDIT: So, here is the code from the main activity(the main screen,) if you click on play a random activity( a quiz question) will show up.

 int defaultScore = 51;



// start Play Intent
public void onPlay(View view){
    Random r = new Random();
    int XML_random = r.nextInt(5)+1; // 5 different Quiz XML files
    Intent startQuiz = new Intent();
    switch(XML_random){
    case 1:
        startQuiz.setClass(view.getContext(), Quiz_1.class);
    break;
    case 2:
        startQuiz.setClass(view.getContext(), Quiz_2.class);
    break;
    case 3:
        startQuiz.setClass(view.getContext(), Quiz_3.class);
    break;
    case 4:
        startQuiz.setClass(view.getContext(), Quiz_4.class);
    break;
    case 5:
        startQuiz.setClass(view.getContext(), Quiz_5.class);
    break;
    } // end of the Random switch
    startQuiz.putExtra("passScore", defaultScore);
    startActivity(startQuiz);

}
So, next if a random activity is chosen, then it's score will be 5, because for the first question, I want the users to start with 5 as a start. So, here is an activty(Question #1) and if the user clicks on the wrong button then Question #2 will show up. And for this activity, the score will be minus 2. Because the user chose the wrong answer.

Question 1 - user clicks on the wrong button:

 public class Quiz_1 extends Activity {
TextView textviewScore;
int current_score = 0;

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.quiz_1);
    textviewScore = (TextView) findViewById(R.id.q_result);   // declaring the TextView
    Bundle extras = getIntent().getExtras();
    if (extras != null)
     {
       current_score   = extras.getInt("passScore");
    }

    textviewScore.setText(String.valueOf(current_score));

} // end of onCreate

public void on_quiz_1_wrong(View view){  // button clicked the wrong answer
    current_score = current_score - 2;
    Intent quiz1 = new Intent(this, Quiz_2.class);
    startActivity(quiz1);
    quiz1.putExtra("passNewScore", current_score);

}
And here is Question #2, and for this activity i want the score to be minus 2.

 public class Quiz_2 extends Activity {
TextView textviewScore;
int current_score = 0;
int getScore=0;
@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.quiz_2);
    textviewScore = (TextView) findViewById(R.id.q_result);   // declaring the TextView
    Bundle extras = getIntent().getExtras();
    if (extras != null)
     {
       current_score   = extras.getInt("passScore");
       getScore = extras.getInt("passNewScore");
    }
    current_score = current_score - getScore;
    textviewScore.setText(String.valueOf(current_score));

} // end of onCreate
I hope, it's now understantable, please help!!! then, i will accept your answer