title: Android Error: Unable to add window -- token null is not for an application
body: <p>Hy. I tried to create an alert dialog but when I run my application, is throw an exception</p>
  
  <pre><code>09-26 12:43:21.949: E/AndroidRuntime(14618): FATAL EXCEPTION: main
  09-26 12:43:21.949: E/AndroidRuntime(14618): android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at android.view.ViewRootImpl.setView(ViewRootImpl.java:687)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:301)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:215)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at android.view.WindowManagerImpl$CompatModeWrapper.addView(WindowManagerImpl.java:140)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at android.app.Dialog.show(Dialog.java:278)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at com.example.stampp.UI.Rewards.DeleteRewardsFragment$1.onItemClick(DeleteRewardsFragment.java:80)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at android.widget.AdapterView.performItemClick(AdapterView.java:292)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at android.widget.AbsListView.performItemClick(AbsListView.java:1394)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at android.widget.AbsListView$PerformClick.run(AbsListView.java:3024)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at android.widget.AbsListView.onTouchEvent(AbsListView.java:3846)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at android.view.View.dispatchTouchEvent(View.java:5629)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1964)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1725)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1970)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1739)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1970)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1739)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1970)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1739)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1970)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1739)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1970)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1739)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1970)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1739)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1970)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1739)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2062)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1400)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at android.app.Activity.dispatchTouchEvent(Activity.java:2369)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2010)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at android.view.View.dispatchPointerEvent(View.java:5809)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at android.view.ViewRootImpl.deliverPointerEvent(ViewRootImpl.java:3130)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2658)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at android.view.ViewRootImpl.processInputEvents(ViewRootImpl.java:1015)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2667)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at android.os.Handler.dispatchMessage(Handler.java:99)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at android.os.Looper.loop(Looper.java:137)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at android.app.ActivityThread.main(ActivityThread.java:4517)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at java.lang.reflect.Method.invokeNative(Native Method)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at java.lang.reflect.Method.invoke(Method.java:511)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:993)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:760)
  09-26 12:43:21.949: E/AndroidRuntime(14618):    at dalvik.system.NativeStart.main(Native Method)
  </code></pre>
  
  <p>This is my code:</p>
  
  <pre><code>public class DeleteRewardsFragment extends Fragment{
  
  private Context context;
  
  private FragmentsActivity activity;
  
  private ListView listView;
  private View myFragmentView;
  private DeleteRewardsAdapter adapter;
  private String[] values;
  
  @SuppressLint("ResourceAsColor")
  public View onCreateView(LayoutInflater inflater, ViewGroup container,
          Bundle savedInstanceState) {
  
      myFragmentView = inflater.inflate(R.layout.listview, container, false);
      listView = (ListView) myFragmentView.findViewById(android.R.id.list);
  
  
      activity = (FragmentsActivity) getActivity();
      context = activity.getApplicationContext();
  
      values = new String[4];
  
      adapter = new DeleteRewardsAdapter(context, values);
      listView.setAdapter(adapter);
      listView.setOnItemClickListener(deleteEvent);
  
      return myFragmentView;
  
  }
  
  private OnItemClickListener deleteEvent = new OnItemClickListener() {
  
      @Override
      public void onItemClick(AdapterView&lt;?&gt; arg0, View arg1, int arg2,
              long arg3) {
          AlertDialog.Builder alertDialog  = new AlertDialog.Builder(context);
          alertDialog .setTitle("Jetzt löschen?");
          alertDialog .setMessage("Die in deisem Store gesammelten stampss gehen debei verloren!")
                  .setCancelable(false)
                  .setPositiveButton("Abbrechen", new DialogInterface.OnClickListener() {
  
                      @Override
                      public void onClick(DialogInterface dialog, int which) {
                          values = new String[values.length-1];
                          adapter = new DeleteRewardsAdapter(context, values);
                          listView.setAdapter(adapter);
                      }
                  })
                  .setNegativeButton("Löschen", new DialogInterface.OnClickListener() {
  
                      @Override
                      public void onClick(DialogInterface dialog, int which) {
                          dialog.cancel();
                      }
                  });
  
          AlertDialog dialog = alertDialog.create();
          dialog.show();
  
      }
  };
  
  }
  </code></pre>
  
  <p>Can someone to help me?</p>