Ionic android 应用程序立即崩溃

Question

我今天发布这篇文章是因为我的离子应用程序有问题。
因此，该应用程序完美地构建在具有 android 工作室的模拟器上。 但是，在启动画面之后，它会立即崩溃。 我不知道为什么会这样。 在调试模式下运行应用程序后，我收到此错误：

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.julesbsz.shortnews, PID: 862
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.julesbsz.shortnews/com.julesbsz.shortnews.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'int org.json.JSONArray.length()' on a null object reference
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3270)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016)
        at android.os.Handler.dispatchMessage(Handler.java:107)
        at android.os.Looper.loop(Looper.java:214)
        at android.app.ActivityThread.main(ActivityThread.java:7356)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
     Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'int org.json.JSONArray.length()' on a null object reference
        at com.codetrixstudio.capacitor.GoogleAuth.GoogleAuth.load(GoogleAuth.java:47)
        at com.getcapacitor.PluginHandle.load(PluginHandle.java:72)
        at com.getcapacitor.PluginHandle.<init>(PluginHandle.java:44)
        at com.getcapacitor.Bridge.registerPlugin(Bridge.java:476)
        at com.getcapacitor.Bridge.registerAllPlugins(Bridge.java:440)
        at com.getcapacitor.Bridge.<init>(Bridge.java:170)
        at com.getcapacitor.BridgeActivity.load(BridgeActivity.java:83)
        at com.getcapacitor.BridgeActivity.init(BridgeActivity.java:62)
        at com.getcapacitor.BridgeActivity.init(BridgeActivity.java:48)
        at com.julesbsz.shortnews.MainActivity.onCreate(MainActivity.java:17)
        at android.app.Activity.performCreate(Activity.java:7802)
        at android.app.Activity.performCreate(Activity.java:7791)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1299)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3245)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409) 
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83) 
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135) 
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016) 
        at android.os.Handler.dispatchMessage(Handler.java:107) 
        at android.os.Looper.loop(Looper.java:214) 
        at android.app.ActivityThread.main(ActivityThread.java:7356) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930) 
Disconnected from the target VM, address: 'localhost:8600', transport: 'socket'

我真的不明白问题是什么。 另外，如果您需要有关特定内容的更多信息，请告诉我。 非常感谢。

Answer 1

如果您阅读堆栈跟踪，您可以看到崩溃源于

at com.julesbsz.shortnews.MainActivity.onCreate(MainActivity.java:17)

然后它似乎在某些授权逻辑上失败了

at com.codetrixstudio.capacitor.GoogleAuth.GoogleAuth.load(GoogleAuth.java:47)

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'int org.json.JSONArray.length()' on a null object reference

您没有发布您的代码，所以也许这是学习如何设置断点和调试的好时机？

https://developer.android.com/studio/debug#breakPoints