android view WindowManager BadTokenException Unable to add window on buider show

Question

From my main activity  I need to call an inner class and in a method within the class  I need to show AlertDialog  After dismissing it  when the OK button is pressed  forward to Google Play for purchase   Things work perfectly for most of the times  but for few users it is crashing on builder show   and I can see  android view WindowManager BadTokenException  Unable to add window  from crash log  Please suggest   My code is pretty much like this   public class classname1 extends Activity     public void onCreate Bundle savedInstanceState        this requestWindowFeature Window FEATURE NO TITLE       super onCreate savedInstanceState       setContentView R layout  lt view gt            call the  lt className1 gt  class to execute        private class classNamename2 extends AsyncTask lt String  Void  String gt        protected String doInBackground String    params          protected void onPostExecute String result         if page contains  error                     AlertDialog Builder builder   new AlertDialog Builder classname1 this           builder setCancelable true           builder setMessage              builder setInverseBackgroundForced true           builder setNeutralButton  Ok  new DialogInterface OnClickListener               public void onClick DialogInterface dialog  int whichButton               dialog dismiss                if   lt condition gt                               try                                 String pl                         mHelper  lt flow gt   lt class gt  this  SKU  RC REQUEST                      lt listener gt   pl                                  catch Exception e                                  e printStackTrace                                                                     builder show                          I have also seen the error in another alert where I am not forwarding to any other activity  It s simple like this                                                          AlertDialog Builder builder   new AlertDialog Builder classname1 this       builder setCancelable true          if successful     builder setMessage           builder setInverseBackgroundForced true       builder setNeutralButton  Ok  new DialogInterface OnClickListener             public void onClick DialogInterface dialog  int whichButton                  dialog dismiss                                     builder show

User · Answer

first you cannot extend AsyncTask without override doInBackground second try to create AlterDailog from the builder then call show     private boolean visible   false  class chkSubscription extends AsyncTask lt String  Void  String gt         protected void onPostExecute String result                AlertDialog Builder builder   new AlertDialog Builder MainActivity this           builder setCancelable true           builder setMessage sucObject           builder setInverseBackgroundForced true           builder setNeutralButton  Ok   new DialogInterface OnClickListener                 public void onClick DialogInterface dialog  int whichButton                                dialog dismiss                                       AlertDialog myAlertDialog   builder create            if visible  myAlertDialog show                Override     protected String doInBackground String    arg0                   TODO Auto-generated method stub         return null             Override protected void onResume            TODO Auto-generated method stub     super onResume        visible   true      Override protected void onStop         visible   false       super onStop

User · Answer

I am creating Dialog in onCreate and using it with show and hide  For me the root cause was not dismissing onBackPressed  which was finishing the Home activity    Override public void onBackPressed     new AlertDialog Builder this                   setTitle  Really Exit                     setMessage  Are you sure you want to exit                     setNegativeButton android R string no  null                   setPositiveButton android R string yes                          new DialogInterface OnClickListener                                  Override                             public void onClick DialogInterface dialog                                      int which                                    Home this finish                                    return                                                           create   show      I was finishing the Home Activity onBackPressed without closing   dismissing my dialogs   When I dismissed my dialogs the crash disappeared   new AlertDialog Builder this                   setTitle  Really Exit                     setMessage  Are you sure you want to exit                     setNegativeButton android R string no  null                   setPositiveButton android R string yes                          new DialogInterface OnClickListener                                  Override                             public void onClick DialogInterface dialog                                      int which                                    networkErrorDialog dismiss                                     homeLocationErrorDialog dismiss                                     currentLocationErrorDialog dismiss                                     Home this finish                                    return                                                           create   show

User · Answer

Try this        public class  lt class gt  extends Activity       private AlertDialog Builder builder       public void onCreate Bundle savedInstanceState                        this requestWindowFeature Window FEATURE NO TITLE                       super onCreate savedInstanceState                    setContentView R layout  lt view gt                      builder   new AlertDialog Builder  lt class gt  this                   builder setCancelable true                   builder setMessage  lt message gt                    builder setInverseBackgroundForced true              call the  lt className gt  class to execute        private class  lt className gt  extends AsyncTask lt String  Void  String gt        protected String doInBackground String    params               protected void onPostExecute String result           if page contains  error      when not subscribed                         if builder  null                   builder setNeutralButton  Ok  new DialogInterface OnClickListener                         public void onClick DialogInterface dialog  int whichButton                       dialog dismiss                            if   lt condition gt                                                     try                                                   String pl                                 mHelper  lt flow gt   lt class gt  this  SKU  RC REQUEST                            lt listener gt   pl                                                      catch Exception e                                                    e printStackTrace                                                                                                     builder show

User · Answer

android view WindowManager BadTokenException  Unable to add window    Problem       This exception occurs when the app is trying to notify the user from   the background thread  AsyncTask  by opening a Dialog        If you are trying to modify the UI from background thread  usually   from onPostExecute   of AsyncTask  and if the activity enters   finishing stage i e   explicitly calling finish    user pressing home   or back button or activity clean up made by Android then you get this   error    Reason       The reason for this exception is that  as the exception message says    the activity has finished but you are trying to display a dialog with   a context of the finished activity  Since there is no window for the   dialog to display the android runtime throws this exception    Solution      Use isFinishing   method which is called by Android to check whether   this activity is in the process of finishing  be it explicit finish     call or activity clean up made by Android  By using this method it is   very easy to avoid opening dialog from background thread when activity   is finishing       Also maintain a weak reference for the activity  and not a strong   reference so that activity can be destroyed once not needed  and check   if the activity is not finishing before performing any UI using this   activity reference  i e  showing a dialog     eg   private class chkSubscription extends AsyncTask lt String  Void  String gt      private final WeakReference lt login gt  loginActivityWeakRef     public chkSubscription  login loginActivity        super        this loginActivityWeakRef  new WeakReference lt login  gt  loginActivity         protected String doInBackground String    params          web service call        protected void onPostExecute String result        if page contains  error      when not subscribed             if  loginActivityWeakRef get      null  amp  amp   loginActivityWeakRef get   isFinishing              AlertDialog Builder builder   new AlertDialog Builder login this           builder setCancelable true           builder setMessage sucObject           builder setInverseBackgroundForced true            builder setNeutralButton  Ok  new DialogInterface OnClickListener               public void onClick DialogInterface dialog  int whichButton               dialog dismiss                                     builder show                          Update    Window Tokens      As its name implies  a window token is a special type of Binder token   that the window manager uses to uniquely identify a window in the   system  Window tokens are important for security because they make it   impossible for malicious applications to draw on top of the windows of   other applications  The window manager protects against this by   requiring applications to pass their application s window token as   part of each request to add or remove a window  If the tokens don t   match  the window manager rejects the request and throws a   BadTokenException  Without window tokens  this necessary   identification step wouldn t be possible and the window manager   wouldn t be able to protect itself from malicious applications      A real-world scenario      When an application starts up for the first time    the  ActivityManagerService  creates a special kind of window token   called an application window token  which uniquely identifies the   application s top-level container window   The activity manager gives   this token to both the application and the window manager  and the   application sends the token to the window manager each time it wants   to add a new window to the screen  This ensures secure interaction   between the application and the window manager  by making it   impossible to add windows on top of other applications   and also   makes it easy for the activity manager to make direct requests to the   window manager

User · Answer

The possible reason is the context of the alert dialog  You may be finished that activity so its trying to open in that context but which is already closed  Try changing the context of that dialog to you first activity beacause it won t be finished till the end   e g    rather than this   AlertDialog alertDialog   new AlertDialog Builder this  create      try to use  AlertDialog alertDialog   new AlertDialog Builder FirstActivity getInstance    create

User · Answer

I try this it solved    AlertDialog Builder builder   new AlertDialog Builder                     this               builder setCancelable true               builder setTitle  Opss                   builder setMessage  You Don t have anough coins to withdraw                  builder setMessage  Please read the Withdraw rules                 builder setInverseBackgroundForced true               builder setPositiveButton  OK                        dialog  which  - gt  dialog dismiss                 builder create   show

User · Answer

I got this error  but mine was coming from the Toasts  not a Dialog  I have Activity and Fragments in my layout  Code for the Toast was in the Activity class  Fragments gets loaded before the Activity  I think the Toast code was hit before the Context Activity finished initializing  I think it was the getApplicationContext   in the command                 Toast makeText getApplicationContext     quot onMenutItemActionCollapse called quot   Toast LENGTH SHORT  show

User · Answer

In my case I refactored code and put the creation of the Dialog in a separate class  I only handed over the clicked View because a View contains a context object already  This led to the same error message although all ran on the MainThread  I then switched to handing over the Activity as well and used its context in the dialog creation - gt  Everything works now      fun showDialogToDeletePhoto baseActivity  BaseActivity  clickedParent  View  deletePhotoClickedListener  DeletePhotoClickedListener            val dialog   AlertDialog Builder baseActivity      lt -- here     setTitle baseActivity getString R string alert delete picture dialog title          I   can t format the code snippet properly  sorry

User · Answer

with this globals variables idea  I saved MainActivity instance in onCreate    Android global variable  public class ApplicationController extends Application        public static MainActivity this MainActivity      and Open dialog like this  it worked    Override protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState           Global Var     globals    ApplicationController  this getApplication        globals this MainActivity   this      and in a thread  I open dialog like this   AlertDialog Builder alert   new AlertDialog Builder globals this MainActivity      Open MainActivity Start a thread  Open dialog from thread -  work  Click  Back button     onCreate will be called and remove first MainActivity  New MainActivity will start    and save it s instance to globals   Open dialog from first thread --  it will open and work

User · Answer

I had dialog showing function   void showDialog        new AlertDialog Builder MyActivity this               show        I was getting this error and i just had to check isFinishing   before calling this dialog showing function   if  isFinishing        showDialog

[android] "android.view.WindowManager$BadTokenException: Unable to add window" on buider.show()

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