logcat如何判断错误位置 如何看logcat
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06-05 15:41:58.729: ERROR/AndroidRuntime(268): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.cola.ui/com.cola.ui.plan}: java.lang.NullPointerException
06-05 15:41:58.729: ERROR/AndroidRuntime(268): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2401)
06-05 15:41:58.729: ERROR/AndroidRuntime(268): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2417)
06-05 15:41:58.729: ERROR/AndroidRuntime(268): at android.app.ActivityThread.access$2100(ActivityThread.java:116)
06-05 15:41:58.729: ERROR/AndroidRuntime(268): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794)
06-05 15:41:58.729: ERROR/AndroidRuntime(268): at android.os.Handler.dispatchMessage(Handler.java:99)
06-05 15:41:58.729: ERROR/AndroidRuntime(268): at android.os.Looper.loop(Looper.java:123)
06-05 15:41:58.729: ERROR/AndroidRuntime(268): at android.app.ActivityThread.main(ActivityThread.java:4203)
06-05 15:41:58.729: ERROR/AndroidRuntime(268): at java.lang.reflect.Method.invokeNative(Native Method)
06-05 15:41:58.729: ERROR/AndroidRuntime(268): at java.lang.reflect.Method.invoke(Method.java:521)
06-05 15:41:58.729: ERROR/AndroidRuntime(268): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
06-05 15:41:58.729: ERROR/AndroidRuntime(268): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549)
06-05 15:41:58.729: ERROR/AndroidRuntime(268): at dalvik.system.NativeStart.main(Native Method)
06-05 15:41:58.729: ERROR/AndroidRuntime(268): Caused by: java.lang.NullPointerException
06-05 15:41:58.729: ERROR/AndroidRuntime(268): at com.cola.ui.plan.onCreate(plan.java:47)
06-05 15:41:58.729: ERROR/AndroidRuntime(268): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123)
06-05 15:41:58.729: ERROR/AndroidRuntime(268): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2364)
06-05 15:41:58.729: ERROR/AndroidRuntime(268): ... 11 more
message中的信息 如何从中找
在红色字体中找出有自己那个类名(应该是具体到方法和行号)的一行
双击此行就跳到出错的位置
06-05 15:41:58.729: ERROR/AndroidRuntime(268): at com.cola.ui.plan.onCreate(plan.java:47)
Caused by:java.lang.NullPointerException,根据这个可以找到你程序出错的原因,然后再找到你自己定义的包!通过这个可以找到因为哪一行而导致程序报错!然后你就可以在这里行设置断点debug等!