Question

我已经在这个项目上工作了几个星期，突然之间我得到了这个java.lang.NullPointerException。它的编译很好。但是当我运行它时，我收到了这个错误所以我更改了工作区并加载了我项目的先前工作版本，我将其保留为备份。并且存在同样的问题。在加载第一个布局之前，应用程序崩溃了......

这是我的logcat：

06-28 20:04:46.428: D/AndroidRuntime(382): Shutting down VM
06-28 20:04:46.428: W/dalvikvm(382): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
06-28 20:04:46.542: E/AndroidRuntime(382): FATAL EXCEPTION: main
06-28 20:04:46.542: E/AndroidRuntime(382): java.lang.RuntimeException: Unable to start activity ComponentInfo{cloud.mobile/cloud.mobile.MCActivity}: java.lang.NullPointerException
06-28 20:04:46.542: E/AndroidRuntime(382):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
06-28 20:04:46.542: E/AndroidRuntime(382):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
06-28 20:04:46.542: E/AndroidRuntime(382):  at android.app.ActivityThread.access$2300(ActivityThread.java:125)
06-28 20:04:46.542: E/AndroidRuntime(382):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
06-28 20:04:46.542: E/AndroidRuntime(382):  at android.os.Handler.dispatchMessage(Handler.java:99)
06-28 20:04:46.542: E/AndroidRuntime(382):  at android.os.Looper.loop(Looper.java:123)
06-28 20:04:46.542: E/AndroidRuntime(382):  at android.app.ActivityThread.main(ActivityThread.java:4627)
06-28 20:04:46.542: E/AndroidRuntime(382):  at java.lang.reflect.Method.invokeNative(Native Method)
06-28 20:04:46.542: E/AndroidRuntime(382):  at java.lang.reflect.Method.invoke(Method.java:521)
06-28 20:04:46.542: E/AndroidRuntime(382):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
06-28 20:04:46.542: E/AndroidRuntime(382):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
06-28 20:04:46.542: E/AndroidRuntime(382):  at dalvik.system.NativeStart.main(Native Method)
06-28 20:04:46.542: E/AndroidRuntime(382): Caused by: java.lang.NullPointerException
06-28 20:04:46.542: E/AndroidRuntime(382):  at cloud.mobile.MCActivity.setLoggedIn(MCActivity.java:279)
06-28 20:04:46.542: E/AndroidRuntime(382):  at cloud.mobile.MCActivity.onCreate(MCActivity.java:198)
06-28 20:04:46.542: E/AndroidRuntime(382):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
06-28 20:04:46.542: E/AndroidRuntime(382):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
06-28 20:04:46.542: E/AndroidRuntime(382):  ... 11 more

P.S-今天，早些时候我玩了一些String Arrays并动态存储在其中。那是我第一次收到这个错误..

Answer 1

如果没有代码，很难说出发生了什么，但要点开始就是

 at cloud.mobile.MCActivity.setLoggedIn(MCActivity.java:279

检查MCActivity中的第279行。在那个特定的行，你试图操作“一些空值”

我的android项目得到“java.lang.NullPointerException”

1 个答案: