phonegap项目到android gradle项目

Question

我正借助以下链接将PhoneGap项目转换为gradle项目：

http://www.catharinegeek.com/embed-cordova-webview-in-android-native-app/

但是我在打开应用时遇到错误

java.lang.RuntimeException：无法启动活动ComponentInfo {com.sellout.selloutzone.sellout / com.sellout.selloutzone.sellout.MainActivity}：java.lang.NullPointerException：尝试调用虚方法'void null对象引用上的org.apache.cordova.CordovaPlugin.privateInitialize（java.lang.String，org.apache.cordova.CordovaInterface，org.apache.cordova.CordovaWebView，org.apache.cordova.CordovaPreferences）'                                                                                    在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:3190）                                                                                    在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:3300）                                                                                    在android.app.ActivityThread.access $ 1000（ActivityThread.java:211）                                                                                    在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1705）                                                                                    在android.os.Handler.dispatchMessage（Handler.java:102）                                                                                    在android.os.Looper.loop（Looper.java:145）                                                                                    在android.app.ActivityThread.main（ActivityThread.java:6946）                                                                                    at java.lang.reflect.Method.invoke（Native Method）                                                                                    在java.lang.reflect.Method.invoke（Method.java:372）                                                                                    在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:1404）                                                                                    在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:1199）                                                                                 引起：java.lang.NullPointerException：尝试调用虚方法'void org.apache.cordova.CordovaPlugin.privateInitialize（java.lang.String，org.apache.cordova.CordovaInterface，org.apache.cordova.CordovaWebView，org。 apache.cordova.CordovaPreferences）'对空对象引用                                                                                    在org.apache.cordova.PluginManager.getPlugin（PluginManager.java:172）                                                                                    在org.apache.cordova.PluginManager.startupPlugins（PluginManager.java:98）                                                                                    在org.apache.cordova.PluginManager.init（PluginManager.java:87）                                                                                    在org.apache.cordova.CordovaWebViewImpl.init（CordovaWebViewImpl.java:116）                                                                                    在org.apache.cordova.CordovaActivity.init（CordovaActivity.java:144）                                                                                    在com.sellout.selloutzone.sellout.MainActivity.onCreate（MainActivity.java:14） 我搜索过的地方也跟着这些链接，但没有运气，请帮助我的朋友，我正在寻找超过2天的解决方案

https://github.com/jimmykobe1171/EmbeddedCorovaWebViewDemo/tree/master/EmbeddedCordovaWebViewDemo/app/src/main

Unfortunately cordova android App Stopped

Ionic app crashes on Android emulator and device