问题
I have some error in logcat but i dont know how to identify it. pls help me to find out this problem. My system crashes after running the emulator. I don't know what is an error in my project.
Thanks in advance.
02-14 16:45:44.527: D/dalvikvm(562): Not late-enabling CheckJNI (already on)
02-14 16:45:46.407: I/ActivityThread(562): Pub polito.mailandroid: polito.mailandroid.ui.ElementProvider
02-14 16:45:46.417: D/AndroidRuntime(562): Shutting down VM
02-14 16:45:46.417: W/dalvikvm(562): threadid=1: thread exiting with uncaught exception (group=0x409c01f8)
02-14 16:45:46.487: E/AndroidRuntime(562): FATAL EXCEPTION: main
02-14 16:45:46.487: E/AndroidRuntime(562): java.lang.RuntimeException: Unable to get provider polito.mailandroid.ui.ElementProvider: java.lang.ClassNotFoundException: polito.mailandroid.ui.ElementProvider
02-14 16:45:46.487: E/AndroidRuntime(562): at android.app.ActivityThread.installProvider(ActivityThread.java:4240)
02-14 16:45:46.487: E/AndroidRuntime(562): at android.app.ActivityThread.installContentProviders(ActivityThread.java:3992)
02-14 16:45:46.487: E/AndroidRuntime(562): at android.app.ActivityThread.handleBindApplication(ActivityThread.java:3946)
02-14 16:45:46.487: E/AndroidRuntime(562): at android.app.ActivityThread.access$1300(ActivityThread.java:123)
02-14 16:45:46.487: E/AndroidRuntime(562): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1185)
02-14 16:45:46.487: E/AndroidRuntime(562): at android.os.Handler.dispatchMessage(Handler.java:99)
02-14 16:45:46.487: E/AndroidRuntime(562): at android.os.Looper.loop(Looper.java:137)
02-14 16:45:46.487: E/AndroidRuntime(562): at android.app.ActivityThread.main(ActivityThread.java:4424)
02-14 16:45:46.487: E/AndroidRuntime(562): at java.lang.reflect.Method.invokeNative(Native Method)
02-14 16:45:46.487: E/AndroidRuntime(562): at java.lang.reflect.Method.invoke(Method.java:511)
02-14 16:45:46.487: E/AndroidRuntime(562): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
02-14 16:45:46.487: E/AndroidRuntime(562): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
02-14 16:45:46.487: E/AndroidRuntime(562): at dalvik.system.NativeStart.main(Native Method)
02-14 16:45:46.487: E/AndroidRuntime(562): Caused by: java.lang.ClassNotFoundException: polito.mailandroid.ui.ElementProvider
02-14 16:45:46.487: E/AndroidRuntime(562): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
02-14 16:45:46.487: E/AndroidRuntime(562): at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
02-14 16:45:46.487: E/AndroidRuntime(562): at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
02-14 16:45:46.487: E/AndroidRuntime(562): at android.app.ActivityThread.installProvider(ActivityThread.java:4225)
02-14 16:45:46.487: E/AndroidRuntime(562): ... 12 more
02-14 16:46:16.637: I/Process(562): Sending signal. PID: 562 SIG: 9
02-14 17:00:46.667: I/ActivityThread(644): Pub polito.mailandroid: polito.mailandroid.ui.ElementProvider
02-14 17:00:46.667: D/AndroidRuntime(644): Shutting down VM
02-14 17:00:46.717: W/dalvikvm(644): threadid=1: thread exiting with uncaught exception (group=0x409c01f8)
02-14 17:00:46.727: E/AndroidRuntime(644): FATAL EXCEPTION: main
02-14 17:00:46.727: E/AndroidRuntime(644): java.lang.RuntimeException: Unable to get provider polito.mailandroid.ui.ElementProvider: java.lang.ClassNotFoundException: polito.mailandroid.ui.ElementProvider
02-14 17:00:46.727: E/AndroidRuntime(644): at android.app.ActivityThread.installProvider(ActivityThread.java:4240)
02-14 17:00:46.727: E/AndroidRuntime(644): at android.app.ActivityThread.installContentProviders(ActivityThread.java:3992)
02-14 17:00:46.727: E/AndroidRuntime(644): at android.app.ActivityThread.handleBindApplication(ActivityThread.java:3946)
02-14 17:00:46.727: E/AndroidRuntime(644): at android.app.ActivityThread.access$1300(ActivityThread.java:123)
02-14 17:00:46.727: E/AndroidRuntime(644): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1185)
02-14 17:00:46.727: E/AndroidRuntime(644): at android.os.Handler.dispatchMessage(Handler.java:99)
02-14 17:00:46.727: E/AndroidRuntime(644): at android.os.Looper.loop(Looper.java:137)
02-14 17:00:46.727: E/AndroidRuntime(644): at android.app.ActivityThread.main(ActivityThread.java:4424)
02-14 17:00:46.727: E/AndroidRuntime(644): at java.lang.reflect.Method.invokeNative(Native Method)
02-14 17:00:46.727: E/AndroidRuntime(644): at java.lang.reflect.Method.invoke(Method.java:511)
02-14 17:00:46.727: E/AndroidRuntime(644): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
02-14 17:00:46.727: E/AndroidRuntime(644): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
02-14 17:00:46.727: E/AndroidRuntime(644): at dalvik.system.NativeStart.main(Native Method)
02-14 17:00:46.727: E/AndroidRuntime(644): Caused by: java.lang.ClassNotFoundException: polito.mailandroid.ui.ElementProvider
02-14 17:00:46.727: E/AndroidRuntime(644): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
02-14 17:00:46.727: E/AndroidRuntime(644): at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
02-14 17:00:46.727: E/AndroidRuntime(644): at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
02-14 17:00:46.727: E/AndroidRuntime(644): at android.app.ActivityThread.installProvider(ActivityThread.java:4225)
02-14 17:00:46.727: E/AndroidRuntime(644): ... 12 more
02-14 17:09:00.347: I/ActivityThread(692): Pub polito.mailandroid: polito.mailandroid.ui.ElementProvider
02-14 17:09:00.437: D/AndroidRuntime(692): Shutting down VM
02-14 17:09:00.437: W/dalvikvm(692): threadid=1: thread exiting with uncaught exception (group=0x409c01f8)
02-14 17:09:00.457: E/AndroidRuntime(692): FATAL EXCEPTION: main
02-14 17:09:00.457: E/AndroidRuntime(692): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{polito.mailandroid.ui/polito.mailandroid.ui.ui.LoginUI}: java.lang.ClassNotFoundException: polito.mailandroid.ui.ui.LoginUI
02-14 17:09:00.457: E/AndroidRuntime(692): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1880)
02-14 17:09:00.457: E/AndroidRuntime(692): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
02-14 17:09:00.457: E/AndroidRuntime(692): at android.app.ActivityThread.access$600(ActivityThread.java:123)
02-14 17:09:00.457: E/AndroidRuntime(692): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
02-14 17:09:00.457: E/AndroidRuntime(692): at android.os.Handler.dispatchMessage(Handler.java:99)
02-14 17:09:00.457: E/AndroidRuntime(692): at android.os.Looper.loop(Looper.java:137)
02-14 17:09:00.457: E/AndroidRuntime(692): at android.app.ActivityThread.main(ActivityThread.java:4424)
02-14 17:09:00.457: E/AndroidRuntime(692): at java.lang.reflect.Method.invokeNative(Native Method)
02-14 17:09:00.457: E/AndroidRuntime(692): at java.lang.reflect.Method.invoke(Method.java:511)
02-14 17:09:00.457: E/AndroidRuntime(692): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
02-14 17:09:00.457: E/AndroidRuntime(692): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
02-14 17:09:00.457: E/AndroidRuntime(692): at dalvik.system.NativeStart.main(Native Method)
02-14 17:09:00.457: E/AndroidRuntime(692): Caused by: java.lang.ClassNotFoundException: polito.mailandroid.ui.ui.LoginUI
02-14 17:09:00.457: E/AndroidRuntime(692): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
02-14 17:09:00.457: E/AndroidRuntime(692): at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
02-14 17:09:00.457: E/AndroidRuntime(692): at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
02-14 17:09:00.457: E/AndroidRuntime(692): at android.app.Instrumentation.newActivity(Instrumentation.java:1023)
02-14 17:09:00.457: E/AndroidRuntime(692): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1871)
02-14 17:09:00.457: E/AndroidRuntime(692): ... 11 more
回答1:
i.e error from the Logcat
Caused by: java.lang.ClassNotFoundException: polito.mailandroid.ui.ElementProvider
02-14 16:45:46.487: E/AndroidRuntime(562): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
回答2:
The classes polito.mailandroid.ui.ui.LoginUI and polito.mailandroid.ui.ElementProvider were not found. You should check the .apk and your build script to include them.
回答3:
Its class Not found exception.
make sure class you are using is exists or not and do entry in manifest of particular activity.
回答4:
The error is
02-14 17:00:46.727: E/AndroidRuntime(644): Caused by: java.lang.ClassNotFoundException: polito.mailandroid.ui.ElementProvider
Have you forgotten to declare your ContentProvider in AndroidManifest.xml?
回答5:
You are facing a RuntimeException that was not handled. It is Caused by: java.lang.ClassNotFoundException: polito.mailandroid.ui.ElementProvider because most probably you did not define it in the Manifest file
回答6:
Your are facing this error please see to it
02-14 16:45:46.487: E/AndroidRuntime(562): java.lang.RuntimeException: Unable to get provider polito.mailandroid.ui.ElementProvider: java.lang.ClassNotFoundException: polito.mailandroid.ui.ElementProvider
回答7:
It seems ur new to java . Read about Exception in java that will help .And for the time being look for error which contains the name of the package or file and read the Caused By error .
来源：https://stackoverflow.com/questions/9277141/how-to-identify-the-error-in-logcat