我正在使用Adobe Flash Builder 4.6构建移动AIR应用程序(Android和IOS),我遇到了这个烦人的问题。
因为我想在Android设备上“抓住”后退键,所以我将以下代码添加到我的主要类中:
stage.addEventListener(KeyboardEvent.KEY_DOWN, keyDown);
private function keyDown(k:KeyboardEvent):void {
if(k.keyCode == Keyboard.BACK) {
backClicked(); // function handling the back-action, not important
k.preventDefault();
}
现在在其他地方 - 嵌套在某些类中 - 我有一个文本字段:
TF = new TextField();
TF.type = TextFieldType.INPUT;
但是当我将焦点设置在文本字段时,软键盘会出现,但我无法输入单个字符。当我禁用keylistener时:没问题。
似乎监听器覆盖了我的输入字段。有没有解决方法呢?
答案 0 :(得分:3)
我还为我的移动应用程序实现了后退按钮功能,但我曾经只在我的特定视图被激活时注册了keydown事件,并在视图被取消激活时删除了注册。
in <s:view ....... viewActivate ="enableHardwareKeyListeners(event)" viewDeactivate="destroyHardwareKeyListeners(event)">
// add listener only for android device
if (Check for android device) {
NativeApplication.nativeApplication.addEventListener(KeyboardEvent.KEY_DOWN, handleHardwareKeysDown, false, 0);
NativeApplication.nativeApplication.addEventListener(KeyboardEvent.KEY_UP, handleHardwareKeysUp, false, 0);
this.setFocus();
}
private function destroyHardwareKeyListeners(event:ViewNavigatorEvent):void
{
if (NativeApplication.nativeApplication.hasEventListener(KeyboardEvent.KEY_DOWN))
NativeApplication.nativeApplication.removeEventListener(KeyboardEvent.KEY_DOWN, handleHardwareKeysDown);
if (NativeApplication.nativeApplication.hasEventListener(KeyboardEvent.KEY_UP))
NativeApplication.nativeApplication.removeEventListener(KeyboardEvent.KEY_UP, handleHardwareKeysUp);
}
private function handleHardwareKeysDown(e:KeyboardEvent):void
{
if (e.keyCode == Keyboard.BACK) {
e.preventDefault();
// your code
} else {
}
}
private function handleHardwareKeysUp(e:KeyboardEvent):void
{
if (e.keyCode == Keyboard.BACK)
e.preventDefault();
}
这可以帮到你。