Mobile back button is not working in framework 7 v5

Questions
1

var viewMain = app.views.create(’.view-main’, {
stackPages: true,
pushState: true,
pushStateSeparator: ‘#’
});

2

@autocar you should need to try this Function.
open your cordova-app.js and find this function name handleAndroidBackButton and replace. hope working for you

handleAndroidBackButton: function () {
    var f7 = cordovaApp.f7;
    const $ = f7.$;
    if (f7.device.electron) return;
    cordovaApp.backButtonTimestamp = new Date().getTime();
    document.addEventListener('backbutton', function (e) {
      if ($('.actions-modal.modal-in').length) {
        f7.actions.close('.actions-modal.modal-in');
        e.preventDefault();
        return false;
      }
      if ($('.dialog.modal-in').length) {
        f7.dialog.close('.dialog.modal-in');
        e.preventDefault();
        return false;
      }
      if ($('.sheet-modal.modal-in').length) {
        f7.sheet.close('.sheet-modal.modal-in');
        e.preventDefault();
        return false;
      }
      if ($('.popover.modal-in').length) {
        f7.popover.close('.popover.modal-in');
        e.preventDefault();
        return false;
      }
      if ($('.popup.modal-in').length) {
        f7.popup.close('.popup.modal-in');
        e.preventDefault();
        return false;
      }

      const currentView = f7.views.current;
      if (currentView && currentView.router && currentView.router.history.length > 1) {
        currentView.router.back();
        e.preventDefault();
        return false;
      }
      if ($('.panel.panel-in').length) {
        f7.panel.close('.panel.panel-in');
        e.preventDefault();
        return false;
      }
      if (new Date().getTime() - cordovaApp.backButtonTimestamp < 250) {
        cordovaApp.backButtonTimestamp = new Date().getTime();
        if (window.navigator.app && window.navigator.app.exitApp) {
          f7.dialog.confirm('Are you sure you want to close this activity?', function () {
            setTimeout(() => {
              window.navigator.app.exitApp();
            }, 1000);
          });
        }
        return true;
      }
      cordovaApp.backButtonTimestamp = new Date().getTime();
      e.preventDefault();
      return false;
    }, false);
  },
3

Thanks for reply hadley
I have not installed cordova in my app is there any other way to handle this or i need to install cordova