title: Adding an array of views crashes an android app
body: <p>I have some part of an android app here which crashes for no apparent reason.</p>
  
  <p>RL0 happens to be some LinearLayout defined in XML which already contains some other irrelevant stuff. To be honest with you, I've mostly worked with C++ so I might not initially know much about why some things are done significantly different in android, but I'm putting effort. Any help on how I can fix that crash?
  Error message states NullPointerException.
  Thanks.</p>
  
  <pre><code>public class Osteoporoza extends Activity {
      public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_osteoporoza);
          LinearLayout RL0=(LinearLayout)findViewById(R.id.RL0);        
  
          page[] pages=new page[10];
          RL0.addView(pages[0].pageLL0);//doesn't crash without this line, yet i need to have some way of adding n objects that follow a pattern, i.e. a class.
  
  class page
  {
      public LinearLayout pageLL0;
          public ScrollView pageUpperScroll1;
              public TextView pageTextView2;
          public ScrollView pageLowerScroll1;
              public LinearLayout pageAnswerButtonLL2;
                  public Button AnswerButton3_1;
                  public Button AnswerButton3_2;
                  public Button AnswerButton3_3;
                  public Button AnswerButton3_4;
  
      page()
      {
          pageAnswerButtonLL2.addView(AnswerButton3_1);
          pageAnswerButtonLL2.addView(AnswerButton3_2);
          pageAnswerButtonLL2.addView(AnswerButton3_3);
          pageAnswerButtonLL2.addView(AnswerButton3_4);
  
          pageLowerScroll1.addView(pageAnswerButtonLL2);
          pageUpperScroll1.addView(pageTextView2);
  
          pageLL0.addView(pageUpperScroll1);
          pageLL0.addView(pageLowerScroll1);
      }
  }
  </code></pre>