1、需求描述   

    因为要控制在返回上一页面的时候，如果有键盘，需要先隐藏键盘，所以需要自定义android手机的物理返回键单击事件，自己定义返回按钮的优先级操作，然后实现在首页面和登录页双击退出应用的操作。

2、准备

    添加插件$cordovaToast，$cordovaKeyboard

cordova plugin add https://github.com/driftyco/ionic-plugins-keyboard.gitcordova plugin add https://github.com/EddyVerbruggen/Toast-PhoneGap-Plugin.git

3、代码实现

    引入$cordovaToast，$cordovaKeyboard的依赖。

angular.module('starter', ['ionic', 'route', 'config', 'global', 'commonJs', 'ngCordova'])    .run(['$ionicPlatform', '$rootScope', '$location', '$timeout', '$ionicHistory', 'CommonJs', '$cordovaToast','$cordovaKeyboard', function ($ionicPlatform, $rootScope, $location, $timeout, $ionicHistory,CommonJs,$cordovaToast,$cordovaKeyboard) {        $ionicPlatform.ready(function () {            // Hide the accessory bar by default (remove this to show the accessory bar above the keyboard            if (window.cordova && window.cordova.plugins && window.cordova.plugins.Keyboard) {                cordova.plugins.Keyboard.hideKeyboardAccessoryBar(true);            }            if (window.StatusBar) {                // org.apache.cordova.statusbar required                StatusBar.styleLightContent();            }        });        //物理返回按钮控制&双击退出应用        $ionicPlatform.registerBackButtonAction(function (e) {            //判断处于哪个页面时双击退出            if ($location.path() == '/tab/todoList' || $location.path() == '/tab/doneList' || $location.path() == '/tab/account'|| $location.path() == '/login') {                if ($rootScope.backButtonPressedOnceToExit) {                    ionic.Platform.exitApp();                } else {                    $rootScope.backButtonPressedOnceToExit = true;                    $cordovaToast.showShortBottom('再按一次退出系统');                    setTimeout(function () {                        $rootScope.backButtonPressedOnceToExit = false;                    }, 2000);                }            }else if ($ionicHistory.backView()) {                if ($cordovaKeyboard.isVisible()) {                    $cordovaKeyboard.close();                } else {                    $ionicHistory.goBack();                }            }            else {                $rootScope.backButtonPressedOnceToExit = true;                $cordovaToast.showShortBottom('再按一次退出系统');                setTimeout(function () {                    $rootScope.backButtonPressedOnceToExit = false;                }, 2000);            }            e.preventDefault();            return false;        }, 101);    }]);