android问题：[7]FATAL EXCEPTION: main

1、因为要增加一个自动更新，所以把Main页分开两个页，拿了自动更新页做启动页，问题就出现了。

2、-- FATAL EXCEPTION: main--java.lang.RuntimeException: 炽扃仄呦Unable to instantiate activity ComponentInfo{com.example.searchwlan/com.example.searchwlan.Update}: java.lang.ClassNotFoundException: com.example.searchwlan.Update03-20 09:55:24.591: E/AndroidRuntime(24806): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2110)03-20 09:55:24.591: E/AndroidRuntime(24806): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2229)03-20 09:55:24.591: E/AndroidRuntime(24806): at android.app.ActivityThread.access$600(ActivityThread.java:139)03-20 09:55:24.591: E/AndroidRuntime(24806): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1261)03-20 09:55:24.591: E/AndroidRuntime(24806): at android.os.Handler.dispatchMessage(Handler.java:99)03-20 09:55:24.591: E/AndroidRuntime(24806): at android.os.Looper.loop(Looper.java:154)03-20 09:55:24.591: E/AndroidRuntime(24806): at android.app.ActivityThread.main(ActivityThread.java:4944)03-20 09:55:24.591: E/AndroidRuntime(24806): at java.lang.reflect.Method.invokeNative(Native Method)03-20 09:55:24.591: E/AndroidRuntime(24806): at java.lang.reflect.Method.invoke(Method.java:511)03-20 09:55:24.591: E/AndroidRuntime(24806): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)03-20 09:55:24.591: E/AndroidRuntime(24806): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)03-20 09:55:24.591: E/AndroidRuntime(24806): at dalvik.system.NativeStart.main(Native Method)03-20 09:55:24.591: E/AndroidRuntime(24806): Caused by: java.lang.ClassNotFoundException: com.example.searchwlan.Update03-20 09:55:24.591: E/AndroidRuntime(24806): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)03-20 09:55:24.591: E/AndroidRuntime(24806): at java.lang.ClassLoader.loadClass(ClassLoader.java:501)03-20 09:55:24.591: E/AndroidRuntime(24806): at java.lang.ClassLoader.loadClass(ClassLoader.java:461)03-20 09:55:24.591: E/AndroidRuntime(24806): at android.app.Instrumentation.newActivity(Instrumentation.java:1039)03-20 09:55:24.591: E/AndroidRuntime(24806): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2101)

4、顺便说下把Main页分开两个页，拿了自动更新页做启动页，还有要Main页也要给权限，