android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application

android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application

I got this error when I had been working one of my android project..This error occurs due to I declare the dialog box should like below..

Dialog dialog =new Dialog(getApplicationContext());

Here I am using getApplicationContext() its denotes the context of whole application,due to mention this I got the error.

To solve this issues you need to mention like below..

Dialog dialog =new Dialog(st.this);

Here st denotes my activity, we have to declare the activity context to dialog.Now you can run the project it will work superbly.