我是android的初學者,之前寫了一個與單晶片藍芽模主通訊的activity,可以work,由於實作的需要,要將藍芽通訊的程式碼寫在service中,我將該段藍芽通訊的程式碼原封不動的放入service的onstart()中,程式碼在存檔時都沒有錯誤訊息但,用手機執行時就發生錯誤
01-28 09:48:39.274: D/AndroidRuntime(6276): Shutting down VM
01-28 09:48:39.274: W/dalvikvm(6276): threadid=1: thread exiting with uncaught exception (group=0x2aac8578)

01-28 09:48:39.285: E/AndroidRuntime(6276): FATAL EXCEPTION: main

01-28 09:48:39.285: E/AndroidRuntime(6276): java.lang.NullPointerException

01-28 09:48:39.285: E/AndroidRuntime(6276): at com.example.studenttcpclient.Myservice$1.handleMessage(Myservice.java:55)

01-28 09:48:39.285: E/AndroidRuntime(6276): at android.os.Handler.dispatchMessage(Handler.java:99)

01-28 09:48:39.285: E/AndroidRuntime(6276): at android.os.Looper.loop(Looper.java:130)

01-28 09:48:39.285: E/AndroidRuntime(6276): at android.app.ActivityThread.main(ActivityThread.java:3701)

01-28 09:48:39.285: E/AndroidRuntime(6276): at java.lang.reflect.Method.invokeNative(Native Method)

01-28 09:48:39.285: E/AndroidRuntime(6276): at java.lang.reflect.Method.invoke(Method.java:507)

01-28 09:48:39.285: E/AndroidRuntime(6276): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)

01-28 09:48:39.285: E/AndroidRuntime(6276): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:624)

01-28 09:48:39.285: E/AndroidRuntime(6276): at dalvik.system.NativeStart.main(Native Method)

可以指導一下小弟我嗎