试图通过logcat查找运行时错误，不明白怎么读

Posted 2023-02-24

【中文标题】试图通过logcat查找运行时错误，不明白怎么读

【英文标题】：Trying to find a run time error via logcat, do not understand how to read it

【发布时间】：2012-02-13 18:58:20

【问题描述】：

我遇到了运行时错误，无法确定它在哪里。我看着logcat，不明白我在看它。谁能帮我理解这意味着什么，这样我就可以找出去哪里解决错误。

02-13 10:50:10.868: D/androidRuntime(529): Shutting down VM
02-13 10:50:10.868: W/dalvikvm(529): threadid=1: thread exiting with uncaught exception (group=0x40015560)
02-13 10:50:10.948: E/AndroidRuntime(529): FATAL EXCEPTION: main
02-13 10:50:10.948: E/AndroidRuntime(529): java.lang.RuntimeException: Unable to instantiate activity ComponentInfocom.signalsetapp/com.signalsetapp.SignalSetMobileAppActivity: java.lang.ClassNotFoundException: com.signalsetapp.SignalSetMobileAppActivity in loader dalvik.system.PathClassLoader[/data/app/com.signalsetapp-2.apk]
02-13 10:50:10.948: E/AndroidRuntime(529):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1544)
02-13 10:50:10.948: E/AndroidRuntime(529):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1638)
02-13 10:50:10.948: E/AndroidRuntime(529):  at android.app.ActivityThread.access$1500(ActivityThread.java:117)
02-13 10:50:10.948: E/AndroidRuntime(529):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:928)
02-13 10:50:10.948: E/AndroidRuntime(529):  at android.os.Handler.dispatchMessage(Handler.java:99)
02-13 10:50:10.948: E/AndroidRuntime(529):  at android.os.Looper.loop(Looper.java:123)
02-13 10:50:10.948: E/AndroidRuntime(529):  at android.app.ActivityThread.main(ActivityThread.java:3647)
02-13 10:50:10.948: E/AndroidRuntime(529):  at java.lang.reflect.Method.invokeNative(Native Method)
02-13 10:50:10.948: E/AndroidRuntime(529):  at java.lang.reflect.Method.invoke(Method.java:507)
02-13 10:50:10.948: E/AndroidRuntime(529):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
02-13 10:50:10.948: E/AndroidRuntime(529):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
02-13 10:50:10.948: E/AndroidRuntime(529):  at dalvik.system.NativeStart.main(Native Method)
02-13 10:50:10.948: E/AndroidRuntime(529): Caused by: java.lang.ClassNotFoundException: com.signalsetapp.SignalSetMobileAppActivity in loader dalvik.system.PathClassLoader[/data/app/com.signalsetapp-2.apk]
02-13 10:50:10.948: E/AndroidRuntime(529):  at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:240)
02-13 10:50:10.948: E/AndroidRuntime(529):  at java.lang.ClassLoader.loadClass(ClassLoader.java:551)
02-13 10:50:10.948: E/AndroidRuntime(529):  at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
02-13 10:50:10.948: E/AndroidRuntime(529):  at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
02-13 10:50:10.948: E/AndroidRuntime(529):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1536)
02-13 10:50:10.948: E/AndroidRuntime(529):  ... 11 more
02-13 10:50:14.748: I/Process(529): Sending signal. PID: 529 SIG: 9

【问题讨论】：

都是关于java.lang.ClassNotFoundException:..

什么时候出现错误？启动时？当您尝试开始另一项活动时？

如果我没看错，错误在 SignalSetMobileAppActivity

如果它发生在启动时，问题可能出在您的 AndroidManifest.xml 中。请参阅下面 Binyamin 的回答。

【参考方案1】：

Dalvik 无法实例化类 SignalSetMobileAppActivity：

Unable to instantiate activity ComponentInfocom.signalsetapp/com.signalsetapp.SignalSetMobileAppActivity:

因为找不到类：

Caused by: java.lang.ClassNotFoundException: com.signalsetapp.SignalSetMobileAppActivity in loader dalvik.system.PathClassLoader[/data/app/com.signalsetapp-2.apk]

这通常发生在您未在清单中声明活动时。类似的东西：

<activity android:name="com.signalsetapp.SignalSetMobileAppActivity" /> 

【讨论】：

这是我的清单

该应用程序是否安装在 SD 卡上？您是否尝试过清理和重建项目？

【参考方案2】：

java.lang.RuntimeException: Unable to instantiate activity ComponentInfocom.signalsetapp/com.signalsetapp.SignalSetMobileAppActivity: java.lang.ClassNotFoundException: com.signalsetapp.SignalSetMobileAppActivity in loader dalvik.system.PathClassLoader[/data/app/com.signalsetapp-2.apk]

Android 找不到 com.signalsetapp.SignalSetMobileAppActivity，它在清单中声明为 Activity。