title: NullPointerException when creating a new Dialog
body: <p>I have a DialogFragment that creates a listview dialog and on a list item click I want to display an alert dialog but when I create the dialog it gives me a <code>NullPointerException</code> with an error that I have never seen before</p>
  
  <pre><code>08-05 11:40:42.315: E/AndroidRuntime(4693): java.lang.NullPointerException
  08-05 11:40:42.315: E/AndroidRuntime(4693):     at android.app.AlertDialog.resolveDialogTheme(AlertDialog.java:142)
  08-05 11:40:42.315: E/AndroidRuntime(4693):     at android.app.AlertDialog$Builder.&lt;init&gt;(AlertDialog.java:359)
  08-05 11:40:42.315: E/AndroidRuntime(4693):     at com.tyczj.bowling.dialogs.SeasonType$1$1.onClick(SeasonType.java:60)
  08-05 11:40:42.315: E/AndroidRuntime(4693):     at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:166)
  08-05 11:40:42.315: E/AndroidRuntime(4693):     at android.os.Handler.dispatchMessage(Handler.java:99)
  08-05 11:40:42.315: E/AndroidRuntime(4693):     at android.os.Looper.loop(Looper.java:137)
  08-05 11:40:42.315: E/AndroidRuntime(4693):     at android.app.ActivityThread.main(ActivityThread.java:4745)
  08-05 11:40:42.315: E/AndroidRuntime(4693):     at java.lang.reflect.Method.invokeNative(Native Method)
  08-05 11:40:42.315: E/AndroidRuntime(4693):     at java.lang.reflect.Method.invoke(Method.java:511)
  08-05 11:40:42.315: E/AndroidRuntime(4693):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
  08-05 11:40:42.315: E/AndroidRuntime(4693):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
  08-05 11:40:42.315: E/AndroidRuntime(4693):     at dalvik.system.NativeStart.main(Native Method)
  </code></pre>
  
  <p>Here is my Dialog's <code>onCreate</code></p>
  
  <pre><code>@Override
  public Dialog onCreateDialog(Bundle state){
      final Dialog d = new Dialog(getActivity());
      d.setContentView(R.layout.dialog_layout);
      d.setTitle("Select a season");
      ListView lv = (ListView)d.findViewById(R.id.dialog_list);
      String[] list = getResources().getStringArray(R.array.season_dialog_type);
      lv.setAdapter(new ArrayAdapter&lt;String&gt;(getActivity(),R.layout.stats_list_layout,list));
      lv.setOnItemClickListener(new OnItemClickListener(){
  
          @Override
          public void onItemClick(AdapterView&lt;?&gt; arg0, View arg1, int arg2,long arg3) {
              d.dismiss();
              FragmentTransaction ft = getFragmentManager().beginTransaction();
              if(arg2 == 0){
                  DialogFragment df = new SeasonsDialog(true);
                  df.show(ft,null);
              }else if(arg2 == 1){
                  AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
                  final View v = getActivity().getLayoutInflater().inflate(R.layout.add_season_layout, null, false);
                  builder.setTitle("Add a season").setView(v).setPositiveButton("Add", new OnClickListener(){
  
                      @Override
                      public void onClick(DialogInterface arg0, int arg1) {
                          arg0.dismiss();
                          AlertDialog.Builder builder2 = new AlertDialog.Builder(getActivity()); //Error here
                          builder2.setTitle("Warning!").setMessage("Adding a new season will cause all new games to be under this season.\n\n Do you wish to continue?")
                          .setPositiveButton("Yes", new OnClickListener(){
  
                              @Override
                              public void onClick(DialogInterface dialog,int which) {
                                  dialog.dismiss();
                                  EditText et = (EditText)v.findViewById(R.id.editText1);
                                  ContentValues values = new ContentValues();
                                  values.put(Games.SEASON, et.getText().toString());
                                  Uri uri = getActivity().getContentResolver().insert(Games.SEASONS_URI, values);
                                  et.setText("");
                                  SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(getActivity());
                                  SharedPreferences.Editor edit = pref.edit();
                                  edit.putLong(Preferences.SELECTED_SEASON, ContentUris.parseId(uri)).commit();
                              }
  
                          }).setNegativeButton("No", new OnClickListener(){
  
                              @Override
                              public void onClick(DialogInterface dialog,int which) {
                                  dialog.dismiss();
                              }
  
                          }).create().show();
                      }
  
                  }).setNegativeButton("Cancel", new OnClickListener(){
  
                      @Override
                      public void onClick(DialogInterface dialog, int which) {
                          dialog.dismiss();
                      }
  
                  }).create().show();
              }
  
          }
  
      });
  
      return d;
  }
  </code></pre>
  
  <p>it error's out at this line in my <code>onClick</code></p>
  
  <pre><code>AlertDialog.Builder builder2 = new AlertDialog.Builder(getActivity());
  </code></pre>
  
  <p>what does that error mean?</p>