android back button doesn't close my dialog -

i have activity layout. open dialog it. when click button, doesn't work , don't close , activity.

i know can solve overriding onkeydown() method, want know why problem occurred.

about 2 days ago, worked , haven't problem it. want know how solve problem?

here dialog class code:

package digitaldreams.ddvolume;  import android.app.dialog;  import android.content.context; import android.media.audiomanager; import android.os.bundle;   public class dialogvolume extends dialog {            context cont;     public dialogvolume(context context) {         super(context);         cont=context;         // todo auto-generated constructor stub     }     @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         .         .         .         }         @override         public boolean onkeydown(int keycode, keyevent event) { //******   super.onkeyup(keycode, event);  ***** if forget line            .            .            .         return  super.onkeydown(keycode, event);        } 

it simple app control volumes of android.

and activity, call dialog simple layout.

edit:

i myself solve it! forget call super class of onkeyup() function in overrided method silly problem

thank all

setcancelable(true)

should work

http://developer.android.com/reference/android/app/dialog.html#setcancelable(boolean)

public void setcancelable (boolean flag)

added in api level 1 sets whether dialog cancelable key.