我的android项目正在获得“java.lang.NullPointerException”

我已经在这个项目上工作了两周了，突然我得到了这个java.lang.NullPointerException。很好。但是当我运行它时，我得到了这个错误。 因此，我更改了工作区并加载了我的项目的一个以前的工作版本，我将其作为备份保存。还有同样的问题。应用程序在加载第一个布局之前就崩溃了

这是我的日志：

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

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今天，早些时候我玩了一些字符串数组并在其中动态存储。这是我第一次收到此错误。

如果没有代码，很难判断发生了什么，但首先要做的是

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

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检查MCActivity中的第279行。在那一行中，您正试图对某个空值进行操作

清理您的构建，重新构建您的应用程序，然后首先尝试重新调试它。错误显然发生在cloud.mobile.MCActivity.setLoggedInMCActivity.java:279