Javascript backbutton事件监听器覆盖android设备后退按钮 [英] Javascript backbutton event listener overrides the android device back button

问题描述

我使用 cordova 2.6.0 创建了 Android应用。我在我的应用程序中使用 html 标记和 jQuery 菜单功能$ c>在与设备的 menubutton 进行交互时切换。但我无法想出达到以下要求，表现得像本机应用程序。

I have created Android app using cordova 2.6.0. I have implemented a menu feature in my app using html markups and jQuery which toggles on interacting with device's menubutton. But I could not figure out to achieve the following requirement, to behave like a native app.

要求

如果菜单，菜单应隐藏在按设备的后退按钮上 可见。如果菜单不可见，那么 backbutton 现在应该正常运行，也就是说它应该退出 app 或转到后退历史记录。

The menu should hide on pressing device's backbutton if the menu is visible. If the menu is not visible the backbutton should now act normally, which is, either it should exit the app or go to the back history.

这是我的代码

document.addEventListener('deviceready', function(){

document.addEventListener('menubutton', function(){
//Toggle Menu
//Which is working fine
});

document.addEventListener('backbutton', function(){
if(menu is visible) {
  //Hide the menu
  //This is also working fine
return false;
} 

//BUT the default action of backbutton has gone. It cannot exit the app , neither it brings to back history.

//return true;
//I have also tried to return boolean true , but facing the same problem.
});

}, false);

实际问题

如果我为 backbutton 附加 eventlistener 设备的后退按钮被禁用，它无法正常工作。

If I attached an eventlistener for backbutton the device's Back Button is disabled, It does not works as normal.

我的问题是

是 document.addEventListener（'backbutton'，function（）{}）; 过度使用设备的后退按钮？如何摆脱它？

Is document.addEventListener('backbutton', function(){}); over riding the device's back button? How to get rid of it?

这在Android 4.1.2设备上发生

推荐答案

使用侦听器覆盖后退按钮后，它不会执行本机功能。您还必须实现退出行为。

Once you have overridden the back button using the listener, it doesn't perform the native functionalities. You have to implement the exit behaviour as well.

在您的重写方法中，使用以下

In your overriding method, use the following

document.addEventListener('backbutton', function(){
  if(menu is visible) {
       //Hide the menu
       //This is also working fine
   return false;
  }
  else //nothing is visible, exit the app
  {
    navigator.app.exitApp();
  }
});

希望有所帮助。

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