Android 1 6 android view WindowManager BadTokenException Unable to add window -- token null is not for an application

Question

I m trying to open a dialog window  but every time I try to open it it throws this exception   Uncaught handler  thread main exiting due to uncaught exception android view WindowManager BadTokenException        Unable to add window -- token null is not for an application   at android view ViewRoot setView ViewRoot java 460    at android view WindowManagerImpl addView WindowManagerImpl java 177    at android view WindowManagerImpl addView WindowManagerImpl java 91    at android app Dialog show Dialog java 238    at android app Activity showDialog Activity java 2413    I m creating it by calling showDialog with the display s id  The onCreateDialog handler logs fine and I can step through it without an issue  but I ve attached it since it seems like I m missing something    Override public Dialog onCreateDialog int id        Dialog dialog      Context appContext   this getApplicationContext        switch id                case RENAME DIALOG ID              Log i  Edit    Creating rename dialog                   dialog   new Dialog appContext               dialog setContentView R layout rename               dialog setTitle  Rename     noteName               break          default              dialog   null              break            return dialog            Is there something missing from this  Some questions have talked about having this problem when creating a dialog from onCreate  which happens because the activity isn t created yet  but this is coming from a call from a menu object  and the appContext variable seems like it is correctly populated in the debugger

User · Answer

As it s said  you need an Activity as context for the dialog  use  YourActivity this  for a static context or check here for how to use a dynamic one in a safe mode

User · Answer

Just change it into  AlertDialog Builder alert Categoryitem        new AlertDialog Builder YourActivity this     Instead of  AlertDialog Builder alert Categoryitem        new AlertDialog Builder getApplicationContext

User · Answer

Instead of getApplicationContext    just use ActivityName this

User · Answer

Don t use getApplicationContext   on declaring dialouge  Always use this or your activity this

User · Answer

Another solution is to set the window type to a system dialog   dialog getWindow   setType WindowManager LayoutParams TYPE SYSTEM ALERT     This requires the SYSTEM ALERT WINDOW permission    lt uses-permission android name  android permission SYSTEM ALERT WINDOW    gt    As the docs say      Very few applications should use this permission  these windows are intended for system-level interaction with the user    This is a solution you should only use if you require a dialog that s not attached to an activity

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This Worked for me--  new AlertDialog Builder MainActivity this           setMessage Html fromHtml   lt b gt  lt i gt  lt u gt Spread Knowledge Unto The Last lt  u gt  lt  i gt  lt  b gt              setCancelable false           setPositiveButton  Dismiss                   new DialogInterface OnClickListener                         public void onClick DialogInterface dialog  int id                                             show      Use   ActivityName this

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You can also do this   public class Example extends Activity       final Context context   this      final Dialog dialog   new Dialog context       This worked for me

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public class Splash extends Activity        Location location      LocationManager locationManager      LocationListener locationlistener      ImageView image view      ublic static ProgressDialog progressdialog       Override     protected void onCreate Bundle savedInstanceState               TODO Auto-generated method stub         super onCreate savedInstanceState           setContentView R layout splash           progressdialog   new ProgressDialog Splash this              image view setOnClickListener new OnClickListener                   Override             public void onClick View v                       TODO Auto-generated method stub                          locationManager requestLocationUpdates  gps   100000  1  locationlistener                           Toast makeText getApplicationContext     Getting Location plz wait      Toast LENGTH SHORT  show                                 progressdialog setMessage  getting Location                                progressdialog show                                Intent intent   new Intent Splash this Show LatLng class                                                     Text here - use this for getting activity context for progressdialog   progressdialog   new ProgressDialog Splash this     or progressdialog   new ProgressDialog this     use this for getting application context for BroadcastListener      not for progressdialog   progressdialog   new ProgressDialog getApplicationContext     progressdialog   new ProgressDialog getBaseContext

User · Answer

I had a similar issue where I had another class something like this   public class Something     MyActivity myActivity     public Something MyActivity myActivity        this myActivity myActivity         public void someMethod                  AlertDialog Builder builder   new AlertDialog Builder myActivity           AlertDialog alert   builder create       alert show            Worked fine most of the time  but sometimes it crashed with the same error   Then I realise that in MyActivity I had     public class MyActivity extends Activity     public static Something something     public void someMethod         if  something  null          something new Something this                 Because I was holding the object as static  a second run of the code was still holding the original version of the object  and thus was still referring to the original Activity  which no long existed   Silly stupid mistake  especially as I really didn t need to be holding the object as static in the first place

User · Answer

You cannot display an application window dialog through a Context that is not an Activity  Try passing a valid activity reference

User · Answer

The best and the safest way to show a  ProgressDialog  in an AsyncTask  avoiding memory leak problem is to use a  Handler  with Looper main         private ProgressDialog tProgressDialog    then in the  onCreate       tProgressDialog   new ProgressDialog this       tProgressDialog setMessage getString R string loading        tProgressDialog setIndeterminate true     Now you r done with the setup part  Now call  showProgress    and  hideProgress    in AsyncTask       private void showProgress            new Handler Looper getMainLooper                  Override             public void handleMessage Message msg                    tProgressDialog show                            sendEmptyMessage 1              private void hideProgress            new Handler Looper getMainLooper                  Override             public void handleMessage Message msg                    tProgressDialog dismiss                            sendEmptyMessage 1

User · Answer

Try to reset dialog window s type to  WindowManager LayoutParams TYPE SYSTEM ALERT  dialog getWindow   setType WindowManager LayoutParams TYPE SYSTEM ALERT     Don t forget to use the permission android permission SYSTEM ALERT WINDOW

User · Answer

Android documents suggests to use getApplicationContext     but it will not work instead of that use your current activity while instantiating AlertDialog Builder or AlertDialog or Dialog      Ex     AlertDialog Builder builder   new  AlertDialog Builder this     or  AlertDialog Builder builder   new  AlertDialog Builder  Your Activity  this

User · Answer

Instead of   Context appContext   this getApplicationContext    you should use a pointer to the activity you re in  probably this    I got bitten by this today too  the annoying part is the getApplicationContext   is verbatim from developer android com

User · Answer

For nested dialogs this issue is very common  It works when   AlertDialog Builder mDialogBuilder   new AlertDialog Builder MyActivity this     is used instead of   mDialogBuilder   new AlertDialog Builder getApplicationContext     this alternative

User · Answer

Ditto on the getApplicationContext thing   The documents on the android site says to use it  but it doesn t work   grrrrr  -P  Just do   dialog   new Dialog this       this  is usually your Activity from which you start the dialog

[android] Android 1.6: "android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application"

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