测试的安卓应用无法打开

Question

我是初学者，日志看不明白
02-07 08:24:00.514: D/AndroidRuntime(997): Shutting down VM
02-07 08:24:00.514: W/dalvikvm(997): threadid=1: thread exiting with uncaught exception (group=0xa6301288)
02-07 08:24:00.518: E/AndroidRuntime(997): FATAL EXCEPTION: main
02-07 08:24:00.518: E/AndroidRuntime(997): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.activitytest/com.example.activitytest.FirstActivity}: java.lang.ClassNotFoundException: com.example.activitytest.FirstActivity
02-07 08:24:00.518: E/AndroidRuntime(997): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1983)
02-07 08:24:00.518: E/AndroidRuntime(997): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
02-07 08:24:00.518: E/AndroidRuntime(997): at android.app.ActivityThread.access$600(ActivityThread.java:130)
02-07 08:24:00.518: E/AndroidRuntime(997): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
02-07 08:24:00.518: E/AndroidRuntime(997): at android.os.Handler.dispatchMessage(Handler.java:99)
02-07 08:24:00.518: E/AndroidRuntime(997): at android.os.Looper.loop(Looper.java:137)
02-07 08:24:00.518: E/AndroidRuntime(997): at android.app.ActivityThread.main(ActivityThread.java:4745)
02-07 08:24:00.518: E/AndroidRuntime(997): at java.lang.reflect.Method.invokeNative(Native Method)
02-07 08:24:00.518: E/AndroidRuntime(997): at java.lang.reflect.Method.invoke(Method.java:511)
02-07 08:24:00.518: E/AndroidRuntime(997): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
02-07 08:24:00.518: E/AndroidRuntime(997): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
02-07 08:24:00.518: E/AndroidRuntime(997): at dalvik.system.NativeStart.main(Native Method)
02-07 08:24:00.518: E/AndroidRuntime(997): Caused by: java.lang.ClassNotFoundException: com.example.activitytest.FirstActivity
02-07 08:24:00.518: E/AndroidRuntime(997): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
02-07 08:24:00.518: E/AndroidRuntime(997): at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
02-07 08:24:00.518: E/AndroidRuntime(997): at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
02-07 08:24:00.518: E/AndroidRuntime(997): at android.app.Instrumentation.newActivity(Instrumentation.java:1053)
02-07 08:24:00.518: E/AndroidRuntime(997): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1974)
02-07 08:24:00.518: E/AndroidRuntime(997): ... 11 more

Answer 1

Unable to instantiate activity ComponentInfo{com.example.activitytest/com.example.activitytest.FirstActivity}: java.lang.ClassNotFoundException: com.example.activitytest.FirstActivity

这个activity再AndroidManifest.xml是否定义了。