mirror of
https://github.com/Leo501/CocosCreatorTutorial.git
synced 2026-05-08 06:38:37 +08:00
102 lines
3.0 KiB
Markdown
102 lines
3.0 KiB
Markdown
# Cocos Creator 教程 : 监听 Android 返回键
|
||
>有时做原生游戏时，特别是Android平台需要监听返回键，在游戏中做出回应如返回游戏上一层或者是退出游戏。
|
||
|
||
|
||
|
||
### 实现
|
||
* 监听事件
|
||
~~~
|
||
//android 返回键
|
||
cc.systemEvent.on(cc.SystemEvent.EventType.KEY_DOWN, this.onKeyDown, this);
|
||
~~~
|
||
* 取消事件
|
||
~~~
|
||
cc.systemEvent.off(cc.SystemEvent.EventType.KEY_DOWN, this.onKeyDown, this);
|
||
~~~
|
||
* 回调处理
|
||
~~~
|
||
|
||
onKeyDown(event) {
|
||
switch (event.keyCode) {
|
||
//注意Creator版本为2.x的请把cc.KEY.back。修改成cc.macro.KEY.back
|
||
case cc.KEY.back:
|
||
if (this.isBackGame) {
|
||
cc.director.end();
|
||
return;
|
||
}
|
||
this.isBackGame = true;
|
||
this.label.string = '再次按返回键\n将退出游戏';
|
||
this.node.runAction(cc.sequence(cc.delayTime(3), cc.callFunc(() => {
|
||
this.isBackGame = false;
|
||
this.label.string = '';
|
||
})));
|
||
break;
|
||
}
|
||
},
|
||
~~~
|
||
|
||
### 完整代码
|
||
~~~
|
||
cc.Class({
|
||
extends: cc.Component,
|
||
|
||
properties: {
|
||
label: {
|
||
default: null,
|
||
type: cc.Label
|
||
},
|
||
text: 'Hello, World!'
|
||
},
|
||
|
||
// use this for initialization
|
||
onLoad: function () {
|
||
this.label.string = this.text;
|
||
this.registerEvent();
|
||
},
|
||
|
||
registerEvent() {
|
||
//android 返回键
|
||
cc.systemEvent.on(cc.SystemEvent.EventType.KEY_DOWN, this.onKeyDown, this);
|
||
},
|
||
|
||
onKeyDown(event) {
|
||
switch (event.keyCode) {
|
||
//注意Creator版本为2.x的请把cc.KEY.back。修改成cc.macro.KEY.back
|
||
case cc.KEY.back:
|
||
if (this.isBackGame) {
|
||
cc.director.end();
|
||
return;
|
||
}
|
||
this.isBackGame = true;
|
||
this.label.string = '再次按返回键\n将退出游戏';
|
||
this.node.runAction(cc.sequence(cc.delayTime(3), cc.callFunc(() => {
|
||
this.isBackGame = false;
|
||
this.label.string = '';
|
||
})));
|
||
break;
|
||
}
|
||
},
|
||
|
||
offEvent() {
|
||
cc.systemEvent.off(cc.SystemEvent.EventType.KEY_DOWN, this.onKeyDown, this);
|
||
},
|
||
|
||
// called every frame
|
||
update: function (dt) {
|
||
|
||
},
|
||
|
||
onDestroy() {
|
||
this.offEvent();
|
||
}
|
||
});
|
||
|
||
~~~
|
||
|
||
### 关于cc.systemEvent
|
||
它是系统事件，**systemEvent**目前支持按键事件和重力感应事件。详情[官方文档](https://docs.cocos.com/creator/manual/zh/scripting/player-controls.html?h=systemevent)。
|
||
### 关于cc.KEY修改成cc.macro.KEY的问题
|
||
详情请[点击这](https://forum.cocos.com/t/2-0-cc-macro/69113)
|
||
###最后
|
||
如果对你有用，请点喜欢哦。最后放出[Demo](https://github.com/Leo501/CocosCreatorTutorial/tree/master/AndroidBackEventDemo)给大家参考。
|