Android Development: Exit the Program (dialog box, two times back key exit)

private void Exitdialog ()    {        Alertdialog.builder aa=new alertdialog.builder (this);         Aa.settitle ("message Prompt");        Aa.setmessage ("Confirm exit?") ");         Aa.seticon (R.drawable.icon);        Aa.setpositivebutton ("OK", new Dialoginterface.onclicklistener () {                        @Override public            void OnClick ( Dialoginterface dialog, int which) {                //TODO auto-generated method Stub                MainActivity.this.finish ();            }        } );        Aa.setnegativebutton ("Cancel", null);        Aa.create ();         Aa.show ();     }        @Override Public    boolean onKeyDown (int keycode, keyevent event)    {        if (keycode = = Keyevent.keycode_back)        {        exitdialog ();        }        return true;            }

It's still popular. Press two times to return exit, code:

    private static Boolean isexit=false;    private static Boolean hastask=false;    Timer texit=new timer ();    TimerTask task=new TimerTask () {                @Override public        void Run () {            //TODO auto-generated method stub            Isexit =false;            hastask=true;        }    }; @Override Public    boolean onKeyDown (int keycode, keyevent event)    {        if (keycode = = Keyevent.keycode_back)        {            //exitdialog ();            if (Isexit==false)            {                isexit=true;                Toast.maketext (This, "Press again to exit the program", Toast.length_short). Show ();                 if (!hastask) {                    texit.schedule (task, n);                }            }            else            {                finish ();                System.exit (0);            }                    }        return true;        return false;            }

Android Development: Exit the Program (dialog box, two times back key exit)