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

1. public void overrideButton(String button, boolean override) {
2. LOG.i( "App", "WARNING: Volume Button Default Behavior will be overridden. The volume event will be fired!");
3. if (button.equals( "volumeup")) {
4. webView.setButtonPlumbedToJs(KeyEvent.KEYCODE_VOLUME_UP, override);
5. }
6. else if (button.equals( "volumedown")) {
7. webView.setButtonPlumbedToJs(KeyEvent.KEYCODE_VOLUME_DOWN, override);
8. }
9. else if (button.equals( "menu")) {
10. webView.setButtonPlumbedToJs(KeyEvent.KEYCODE_MENU, override);
11. }
12. }

修改2：CordovaWebViewImpl.java

1. @Override
2. public void setButtonPlumbedToJs(int keyCode, boolean override) {
3. switch (keyCode) {
4. case KeyEvent.KEYCODE_VOLUME_DOWN:
5. case KeyEvent.KEYCODE_VOLUME_UP:
6. case KeyEvent.KEYCODE_BACK:
7. case KeyEvent.KEYCODE_MENU:
8. // TODO: Why are search and menu buttons handled separately?
9. if (override) {
10. boundKeyCodes.add(keyCode);
11. } else {
12. boundKeyCodes.remove(keyCode);
13. }
14. return;
15. default:
16. throw new IllegalArgumentException( "Unsupported keycode: " + keyCode);
17. }
18. }

修改3：cordova.js

1. // Add hardware MENU and SEARCH button handlers
2. //cordova.addDocumentEventHandler('menubutton');
3. cordova.addDocumentEventHandler( 'searchbutton');
5. function bindButtonChannel(buttonName) {
6. // generic button bind used for volumeup/volumedown buttons
7. var volumeButtonChannel = cordova.addDocumentEventHandler(buttonName + 'button');
8. volumeButtonChannel.onHasSubscribersChange = function() {
9. exec( null, null, APP_PLUGIN_NAME, "overrideButton", [buttonName, this.numHandlers == 1]);
10. };
11. }
12. // Inject a listener for the volume buttons on the document.
13. bindButtonChannel( 'volumeup');
14. bindButtonChannel( 'volumedown');
15. bindButtonChannel( 'menu');

使用方法同volumeup和volumedown一致：

1. document.addEventListener( 'deviceready', function(){
2. document.addEventListener( 'menubutton',menuKeyDown, false);
3. }, false);
5. function menuKeyDown(){
6. alert( 'menuKeyDown');
7. }

文章转载自：https://blog.youkuaiyun.com/wang_song_yan/article/details/50205803#commentBox

原作者：wang_song_yan