NullPointerException:尝试调用虚拟方法'void org.apache.cordova.CordovaPlugin.privateInitialize [英] NullPointerException: Attempt to invoke virtual method 'void org.apache.cordova.CordovaPlugin.privateInitialize
问题描述
我正在研究我的cordova插件进行一些重构，并且在启动时开始遇到此崩溃:
I was working away on my cordova plugin doing some refactoring and I started to get this crash on startup:
--------- beginning of crash
12-12 21:42:29.791 4693 4693 E AndroidRuntime: FATAL EXCEPTION: main
12-12 21:42:29.791 4693 4693 E AndroidRuntime: Process: xyz.meris.app, PID: 4693
12-12 21:42:29.791 4693 4693 E AndroidRuntime: java.lang.RuntimeException: Unable to start activity ComponentInfo{xyz.meris.app/xyz.meris.app.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void org.apache.cordova.CordovaPlugin.privateInitialize(java.lang.String, org.apache.cordova.CordovaInterface, org.apache.cordova.CordovaWebView, org.apache.cordova.CordovaPreferences)' on a null object reference
12-12 21:42:29.791 4693 4693 E AndroidRuntime: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3162)
12-12 21:42:29.791 4693 4693 E AndroidRuntime: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3305)
12-12 21:42:29.791 4693 4693 E AndroidRuntime: at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
12-12 21:42:29.791 4693 4693 E AndroidRuntime: at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
12-12 21:42:29.791 4693 4693 E AndroidRuntime: at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
12-12 21:42:29.791 4693 4693 E AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1993)
12-12 21:42:29.791 4693 4693 E AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:106)
12-12 21:42:29.791 4693 4693 E AndroidRuntime: at android.os.Looper.loop(Looper.java:216)
12-12 21:42:29.791 4693 4693 E AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:7266)
12-12 21:42:29.791 4693 4693 E AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method)
12-12 21:42:29.791 4693 4693 E AndroidRuntime: at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:494)
12-12 21:42:29.791 4693 4693 E AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:975)
12-12 21:42:29.791 4693 4693 E AndroidRuntime: Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void org.apache.cordova.CordovaPlugin.privateInitialize(java.lang.String, org.apache.cordova.CordovaInterface, org.apache.cordova.CordovaWebView, org.apache.cordova.CordovaPreferences)' on a null object reference
12-12 21:42:29.791 4693 4693 E AndroidRuntime: at org.apache.cordova.PluginManager.getPlugin(PluginManager.java:171)
12-12 21:42:29.791 4693 4693 E AndroidRuntime: at org.apache.cordova.PluginManager.startupPlugins(PluginManager.java:97)
12-12 21:42:29.791 4693 4693 E AndroidRuntime: at org.apache.cordova.PluginManager.init(PluginManager.java:86)
12-12 21:42:29.791 4693 4693 E AndroidRuntime: at org.apache.cordova.CordovaWebViewImpl.init(CordovaWebViewImpl.java:117)
12-12 21:42:29.791 4693 4693 E AndroidRuntime: at org.apache.cordova.CordovaActivity.init(CordovaActivity.java:149)
12-12 21:42:29.791 4693 4693 E AndroidRuntime: at org.apache.cordova.CordovaActivity.loadUrl(CordovaActivity.java:224)
12-12 21:42:29.791 4693 4693 E AndroidRuntime: at xyz.meris.app.MainActivity.onCreate(MainActivity.java:39)
12-12 21:42:29.791 4693 4693 E AndroidRuntime: at android.app.Activity.performCreate(Activity.java:7353)
12-12 21:42:29.791 4693 4693 E AndroidRuntime: at android.app.Activity.performCreate(Activity.java:7344)
12-12 21:42:29.791 4693 4693 E AndroidRuntime: at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1275)
12-12 21:42:29.791 4693 4693 E AndroidRuntime: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3142)
12-12 21:42:29.791 4693 4693 E AndroidRuntime: ... 11 more
12-12 21:42:29.826 4693 4693 I Process : Sending signal. PID: 4693 SIG: 9
我到处闲逛，发现了一些类似的问题:
I hunted around and found some similar questions:
但是解决方案对我不起作用...
But the solutions did not work for me...
推荐答案
我从其他问题中获得了一些线索，并且由于我在进行重构，所以我一直在使用 plugin.xml 文件.
I got some clues from the other questions and because I was refactoring I had been working with the plugin.xml file.
我注意到我与其他 plugin.xml 文件有此区别:
I noticed that I had this difference from other plugin.xml files:
<feature name="CDVProcessLog">
<param name="android-package" value="xyz.meris.processlog.CDVProcessLog" />
<param name="onload" value="true" />
</feature>
<feature name="ProcessLog">
<param name="android-package" value="xyz.meris.processlog.ProcessLog" />
+ <param name="onload" value="true" />
</feature>
因为我复制了< feature> 标记并将其填充，所以我复制了 onload 参数.一旦我删除了重复的 onload 参数，崩溃便不再发生.
Because I copied the <feature> tag and just filled it in I had copied the onload parameter. Once I removed the duplicate onload parameter the crash stopped happening.
erp.原来我还有另一个导致此问题的错误.
erp. Turns out I had another error that was causing this issue.
删除 onload 参数延迟加载的 ProcessLog .所以以后我会得到一个空指针错误.
Removing the onload param lazy loaded ProcessLog. So I would get a null pointer error later.
我的真正问题是我的 .js 文件没有使用我的 CordovaPlugin 类名进行更新.我已将其从 ProcessLog 更改为 CDVProcessLog . ProcessLog 现在具有处理日志的细节，而 CDVProcessLog 主要具有cordova胶，可以在 ProcessLog 中调用我的方法.
My real problem was that my .js file did not get updated with my CordovaPlugin class name. I had changed it from ProcessLogto CDVProcessLog. ProcessLog now had the specifics for processing the log and CDVProcessLog had mostly cordova glue to call my methods in ProcessLog.
我的 .js 文件需要更改:
return new Promise((resolve, reject) => {
- exec(resolve, reject, 'ProcessLog', func, [...args]);
+ exec(resolve, reject, 'CDVProcessLog', func, [...args]);
});
这篇关于NullPointerException:尝试调用虚拟方法'void org.apache.cordova.CordovaPlugin.privateInitialize的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
