求教空指针异常问题

paltan 2014-06-16 07:19:48

Logcat显示的信息如下，自己的代码都逐步执行过，没有抛出异常。异常是在底层的代码里抛出来的
跟踪到底层代码，发现是在android.app包下的Instrumentation.class中，mActivityMonitors为null而抛出
而mActivityMonitors的实例化是在Instrumentation里的addMonitor()，在这里打了断点却没有进入
直接调用了callActivityOnCreate()方法对mActivityMonitors操作而产生空指针异常

还请救大神指点



06-16 05:46:19.076: W/dalvikvm(2336): threadid=1: thread exiting with uncaught exception (group=0xb3ac6ba8)

06-16 05:46:19.086: E/AndroidRuntime(2336): FATAL EXCEPTION: main

06-16 05:46:19.086: E/AndroidRuntime(2336): Process: com.rivscs.client, PID: 2336

06-16 05:46:19.086: E/AndroidRuntime(2336): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.rivscs.client/com.rivscs.client.component.BaseActivity}: java.lang.NullPointerException

06-16 05:46:19.086: E/AndroidRuntime(2336): 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)

06-16 05:46:19.086: E/AndroidRuntime(2336): 	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)

06-16 05:46:19.086: E/AndroidRuntime(2336): 	at android.app.ActivityThread.access$800(ActivityThread.java:135)

06-16 05:46:19.086: E/AndroidRuntime(2336): 	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)

06-16 05:46:19.086: E/AndroidRuntime(2336): 	at android.os.Handler.dispatchMessage(Handler.java:102)

06-16 05:46:19.086: E/AndroidRuntime(2336): 	at android.os.Looper.loop(Looper.java:136)

06-16 05:46:19.086: E/AndroidRuntime(2336): 	at android.app.ActivityThread.main(ActivityThread.java:5017)

06-16 05:46:19.086: E/AndroidRuntime(2336): 	at java.lang.reflect.Method.invokeNative(Native Method)

06-16 05:46:19.086: E/AndroidRuntime(2336): 	at java.lang.reflect.Method.invoke(Method.java:515)

06-16 05:46:19.086: E/AndroidRuntime(2336): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)

06-16 05:46:19.086: E/AndroidRuntime(2336): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)

06-16 05:46:19.086: E/AndroidRuntime(2336): 	at dalvik.system.NativeStart.main(Native Method)

06-16 05:46:19.086: E/AndroidRuntime(2336): Caused by: java.lang.NullPointerException

06-16 05:46:19.086: E/AndroidRuntime(2336): 	at com.rivscs.util.NetStatusUtil.isNetConnectivity(NetStatusUtil.java:11)

06-16 05:46:19.086: E/AndroidRuntime(2336): 	at com.rivscs.client.component.BaseActivity.onStart(BaseActivity.java:401)

06-16 05:46:19.086: E/AndroidRuntime(2336): 	at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1171)

06-16 05:46:19.086: E/AndroidRuntime(2336): 	at android.app.Activity.performStart(Activity.java:5241)

06-16 05:46:19.086: E/AndroidRuntime(2336): 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2168)

06-16 05:46:19.086: E/AndroidRuntime(2336): 	... 11 more