display text when # button is clicked
<p><strong>I want to display a random generated expression like 2+3= when # is pressed. I have implemented this code but when I press it the application crashes.</strong> </p>

<p>My xml code is:</p>

<pre><code>&lt;TextView
        android:id="@+id/randomNumberGen"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="15dp"
        android:textSize="45dp" /&gt;
</code></pre>

<p>Java code is: </p>

<pre><code>package org.example.question;

import java.util.Random;


import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class QuestionActivity extends Activity implements View.OnClickListener {
    /** Called when the activity is first created. */
    int fnum, snum;


Button one,two,three,four,five,six,seven,eight,nine,zero,minus,hash;
    TextView display;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);  

        final Random myRandom = new Random();

        display = (TextView)findViewById(R.id.randonNumberGen);

        //Buttons
        one= (Button) findViewById(R.id.keypad_1);
        two= (Button) findViewById(R.id.keypad_2);
        three= (Button) findViewById(R.id.keypad_3);
        four= (Button) findViewById(R.id.keypad_4);
        five = (Button) findViewById(R.id.keypad_5);
      six= (Button) findViewById(R.id.keypad_6);
        seven = (Button) findViewById(R.id.keypad_7);
        eight = (Button) findViewById(R.id.keypad_8);
        nine = (Button) findViewById(R.id.keypad_9);
        minus = (Button) findViewById(R.id.keypad_subtract);
        hash = (Button) findViewById(R.id.keypad_hash);


        one.setOnClickListener(this);     two.setOnClickListener(this);     three.setOnClickListener(this); 
        three.setOnClickListener(this);   four.setOnClickListener(this);     five.setOnClickListener(this);
        six.setOnClickListener(this);     seven.setOnClickListener(this);     eight.setOnClickListener(this);
        nine.setOnClickListener(this);     minus.setOnClickListener(this);      hash.setOnClickListener(this);

}

    public void onClick(View arg0) {
        View v = null;
        switch(v.getId()){  
        case R.id.keypad_hash:
            display.setText(fnum+"+"+ snum+"=");
             fnum = (int) ((double) ((Math.random() * 1000)) / 100.0);
             snum = (int) ((double) ((Math.random() * 1000)) / 100.0);
            break;
        }

     }
    public void requestFocus() {
        // TODO Auto-generated method stub

    }
}
</code></pre>

<p>When I click the "#" button the application crashes. Any ideas why?</p>
