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

Hello Friends,
                 most of us facing the issue of  Unable to add window — token null
while calling alert dialog from our service class.

As, I am using activity class not the fragment so I am using getApplicationContext()
(as from service we face context issue so instead of using "this" am using
application context) for creating "AlertDialog.Builder" but still facing the issue
while calling dialog.show.

android.view.WindowManager$BadTokenException:
  Unable to add window -- token null is not for an application
    at android.view.ViewRoot.setView(ViewRoot.java:509)
    at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:177)
    at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
    at android.app.Dialog.show(Dialog.java:241)

Here is my code:

view plainprint?

1. AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(  
2.      getApplicationContext());  
3. //ok and cancel button code  
4. ...........  
5. ...........  
6. AlertDialog alertDialog = alertDialogBuilder.create();  
7. alertDialog.show();  

AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
     getApplicationContext());
//ok and cancel button code
...........
...........
AlertDialog alertDialog = alertDialogBuilder.create();
alertDialog.show();

Then after searching a lot I found the solution, I made following few changes in my
code and Its worked for me.

view plainprint?

1. AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(  
2.      getApplicationContext());  
3. //ok and cancel button code  
4. ...........  
5. ...........  
6. AlertDialog alertDialog = alertDialogBuilder.create();  
7. /* 
8. * Window token null exception, when trying to show alert dialog from 
9. * service class.use alertDialog.getWindow() for getting window and 
10. * add permission in manifest 
11. */  
12. alertDialog.getWindow().setType(WindowManager.LayoutParams.  
13.     TYPE_SYSTEM_ALERT);  
14. alertDialog.show();  

AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
     getApplicationContext());
//ok and cancel button code
...........
...........
AlertDialog alertDialog = alertDialogBuilder.create();
/*
* Window token null exception, when trying to show alert dialog from
* service class.use alertDialog.getWindow() for getting window and
* add permission in manifest
*/
alertDialog.getWindow().setType(WindowManager.LayoutParams.
    TYPE_SYSTEM_ALERT);
alertDialog.show();

Also need to add following permission in your manifest file

view plainprint?

1. <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />  

<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />

Hope this will helps some one.
Enjoy coding... cheers :)