Android button click once to exit

 =========================PhoneGap================================== //  Waiting to load phonegap  Document.addeventlistener ("Deviceready",  ondeviceready, false);// phonegap loading Complete function  Ondeviceready ()  {//  button event Document.addeventlistener ("Backbutton",  eventbackbutton, false);  //  return key}//  return key Function eventbackbutton ()  {if  ($ (". Classobj"). Is (": visible"))  {alert (' One more click to exit! '); Document.removeeventlistener ("Backbutton",  eventbackbutton, false); //  Logoff return key Document.addeventlistener ("Backbutton",  exitapp, false);//  bind exit event// 3 seconds after re-registration var  Intervalid = window.setinterval (function ()  {window.clearinterval (intervalid); Document.removeeventlistener ("Backbutton",  exitapp, false); //  Logout return key Document.addeventlistener ("Backbutton",  eventbackbutton, false); //  return key}, 3000);}  else {// navigator.app.backhistory ();}} FunctiOn exitapp ()  {navigator.app.exitapp ();} 

Android button click once to exit