Android Error: Unable to add window -- token null is not for an application

Question

Hy. I tried to create an alert dialog but when I run my application, is throw an exception

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) 

This is my 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<?> 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();      } };  } 

Can someone to help me?

Answer 1

To add AlertDialog to your Activity or Fragment you have to use your Activity's instance, not your application's which you are doing in your code. Create your AlertDialog like this :

AlertDialog.Builder alertDialog  = new AlertDialog.Builder(getActivity()); 

And that should do the trick for you! : )

Answer 2

In my case I was trying to create my dialog like this:

new Dialog(getApplicationContext()); 

So I had to change for:

new Dialog(MyActivity.this); 

And it started working.