eclipse android 运行提示已停止 logcat输出
01-10 06:14:47.040: E/AndroidRuntime(915): FATAL EXCEPTION: main
01-10 06:14:47.040: E/AndroidRuntime(915): Process: com.example.hellomap, PID: 915
01-10 06:14:47.040: E/AndroidRuntime(915): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.hellomap/com.example.hellomap.MainActivity}: java.lang.NullPointerException
01-10 06:14:47.040: E/AndroidRuntime(915): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:210)
01-10 06:14:47.040: E/AndroidRuntime(915): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:223)
01-10 06:14:47.040: E/AndroidRuntime(915): at android.app.ActivityThread.access$800(ActivityThread.java:135)
01-10 06:14:47.040: E/AndroidRuntime(915): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
01-10 06:14:47.040: E/AndroidRuntime(915): at android.os.Handler.dispatchMessage(Handler.java:102)
01-10 06:14:47.040: E/AndroidRuntime(915): at android.os.Looper.loop(Looper.java:136)
01-10 06:14:47.040: E/AndroidRuntime(915): at android.app.ActivityThread.main(ActivityThread.java:5001)
01-10 06:14:47.040: E/AndroidRuntime(915): at java.lang.reflect.Method.invokeNative(Native Method)
01-10 06:14:47.040: E/AndroidRuntime(915): at java.lang.reflect.Method.invoke(Method.java:515)
01-10 06:14:47.040: E/AndroidRuntime(915): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
01-10 06:14:47.040: E/AndroidRuntime(915): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
01-10 06:14:47.040: E/AndroidRuntime(915): at dalvik.system.NativeStart.main(Native Method)
01-10 06:14:47.040: E/AndroidRuntime(915): Caused by: java.lang.NullPointerException
01-10 06:14:47.040: E/AndroidRuntime(915): at com.example.hellomap.MainActivity.<init>(MainActivity.java:46)
01-10 06:14:47.040: E/AndroidRuntime(915): at java.lang.Class.newInstanceImpl(Native Method)
01-10 06:14:47.040: E/AndroidRuntime(915): at java.lang.Class.newInstance(Class.java:1208)
01-10 06:14:47.040: E/AndroidRuntime(915): at android.app.Instrumentation.newActivity(Instrumentation.java:1061)
01-10 06:14:47.040: E/AndroidRuntime(915): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2101)
01-10 06:14:47.040: E/AndroidRuntime(915): ... 11 more