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https://github.com/Leo501/CocosCreatorTutorial.git
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102 lines
3.0 KiB
Markdown
102 lines
3.0 KiB
Markdown
# Cocos Creator 教程 : 监听 Android 返回键
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>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。
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### 实现
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* 监听事件
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~~~
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//android 返回键
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cc.systemEvent.on(cc.SystemEvent.EventType.KEY_DOWN, this.onKeyDown, this);
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~~~
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* 取消事件
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~~~
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cc.systemEvent.off(cc.SystemEvent.EventType.KEY_DOWN, this.onKeyDown, this);
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~~~
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* 回调处理
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~~~
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onKeyDown(event) {
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switch (event.keyCode) {
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//注意Creator版本为2.x的请把cc.KEY.back。修改成cc.macro.KEY.back
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case cc.KEY.back:
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if (this.isBackGame) {
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cc.director.end();
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return;
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}
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this.isBackGame = true;
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this.label.string = '再次按返回键\n将退出游戏';
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this.node.runAction(cc.sequence(cc.delayTime(3), cc.callFunc(() => {
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this.isBackGame = false;
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this.label.string = '';
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})));
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break;
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}
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},
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~~~
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### 完整代码
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~~~
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cc.Class({
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extends: cc.Component,
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properties: {
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label: {
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default: null,
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type: cc.Label
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},
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text: 'Hello, World!'
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},
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// use this for initialization
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onLoad: function () {
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this.label.string = this.text;
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this.registerEvent();
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},
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registerEvent() {
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//android 返回键
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cc.systemEvent.on(cc.SystemEvent.EventType.KEY_DOWN, this.onKeyDown, this);
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},
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onKeyDown(event) {
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switch (event.keyCode) {
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//注意Creator版本为2.x的请把cc.KEY.back。修改成cc.macro.KEY.back
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case cc.KEY.back:
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if (this.isBackGame) {
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cc.director.end();
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return;
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}
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this.isBackGame = true;
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this.label.string = '再次按返回键\n将退出游戏';
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this.node.runAction(cc.sequence(cc.delayTime(3), cc.callFunc(() => {
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this.isBackGame = false;
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this.label.string = '';
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})));
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break;
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}
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},
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offEvent() {
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cc.systemEvent.off(cc.SystemEvent.EventType.KEY_DOWN, this.onKeyDown, this);
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},
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// called every frame
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update: function (dt) {
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},
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onDestroy() {
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this.offEvent();
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}
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});
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~~~
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### 关于cc.systemEvent
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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)。
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### 关于cc.KEY修改成cc.macro.KEY的问题
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详情请[点击这](https://forum.cocos.com/t/2-0-cc-macro/69113)
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###最后
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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。
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