Android平台下cordova的menubutton事件

开发环境：

Android Studio,cordova版本5.3.3

问题描述：

经过代码测试发现，menubutton事件绑定后点击无效果

问题分析：

不知道出于什么原因，代码里面并未添加menubutton的注册代码

问题解决：

从按钮点击事件来看， volumedownbutton,volumeupbutton,backbutton,menubutton事件都是一样的，但是CoreAndroid实现上把返回键与音量加减键区分开，注册方法分别为overrideBackbutton和overridebutton方法。接下来我简单地把menubutton用音量加减的方式进行修改。

修改1：CoreAndroid.java

public void overrideButton(String button, boolean override) {
LOG.i("App", "WARNING: Volume Button Default Behavior will be overridden.  The volume event will be fired!");
if (button.equals("volumeup")) {
webView.setButtonPlumbedToJs(KeyEvent.KEYCODE_VOLUME_UP, override);
}
else if (button.equals("volumedown")) {
webView.setButtonPlumbedToJs(KeyEvent.KEYCODE_VOLUME_DOWN, override);
}
else if (button.equals("menu")) {
webView.setButtonPlumbedToJs(KeyEvent.KEYCODE_MENU, override);
}
}

修改2：CordovaWebViewImpl.java

@Override
public void setButtonPlumbedToJs(int keyCode, boolean override) {
switch (keyCode) {
case KeyEvent.KEYCODE_VOLUME_DOWN:
case KeyEvent.KEYCODE_VOLUME_UP:
case KeyEvent.KEYCODE_BACK:
case KeyEvent.KEYCODE_MENU:
// TODO: Why are search and menu buttons handled separately?
if (override) {
boundKeyCodes.add(keyCode);
} else {
boundKeyCodes.remove(keyCode);
}
return;
default:
throw new IllegalArgumentException("Unsupported keycode: " + keyCode);
}
}

修改3：cordova.js

// Add hardware MENU and SEARCH button handlers
//cordova.addDocumentEventHandler('menubutton');
cordova.addDocumentEventHandler('searchbutton');

function bindButtonChannel(buttonName) {
// generic button bind used for volumeup/volumedown buttons
var volumeButtonChannel = cordova.addDocumentEventHandler(buttonName + 'button');
volumeButtonChannel.onHasSubscribersChange = function() {
exec(null, null, APP_PLUGIN_NAME, "overrideButton", [buttonName, this.numHandlers == 1]);
};
}
// Inject a listener for the volume buttons on the document.
bindButtonChannel('volumeup');
bindButtonChannel('volumedown');
bindButtonChannel('menu');

使用方法同volumeup和volumedown一致：

document.addEventListener('deviceready', function(){
document.addEventListener('menubutton',menuKeyDown,false);
},false);

function menuKeyDown(){
alert('menuKeyDown');
}

写完，休息了

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