Couldn't load libbt_serialport: findLibrary returned null

I/ActivityManager(  167): Start proc com.youzhuan.bluetooth for activity com.youzhuan.bluetooth/.Main: pid=854 uid=1000 gids={3003, 1015, 3002, 3001}
I/PackageManager(  167): Running dexopt on: com.youzhuan.bluetooth
D/dalvikvm(  866): DexOpt: load 10ms, verify+opt 21ms
W/dalvikvm(  854): Exception Ljava/lang/UnsatisfiedLinkError; thrown while initializing Lcom/youzhuan/bluetooth/SerialPort;
D/AndroidRuntime(  854): Shutting down VM
W/dalvikvm(  854): threadid=1: thread exiting with uncaught exception (group=0x409e11f8)
E/AndroidRuntime(  854): FATAL EXCEPTION: main
E/AndroidRuntime(  854): java.lang.ExceptionInInitializerError
E/AndroidRuntime(  854):        at com.youzhuan.bluetooth.SerialPortActivity.onCreate(SerialPortActivity.java:66)
E/AndroidRuntime(  854):        at com.youzhuan.bluetooth.Main.onCreate(Main.java:24)
E/AndroidRuntime(  854):        at android.app.Activity.performCreate(Activity.java:4492)
E/AndroidRuntime(  854):        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
E/AndroidRuntime(  854):        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
E/AndroidRuntime(  854):        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
E/AndroidRuntime(  854):        at android.app.ActivityThread.access$600(ActivityThread.java:123)
E/AndroidRuntime(  854):        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
E/AndroidRuntime(  854):        at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime(  854[  251.516963] UMP<2>: ):         at android.os.Looper.loop(LoNew session opened
oper.java:137)
E/AndroidRuntime(  854):        at android.app.ActivityThread.main(ActivityThread.java:4424)
E/AndroidRuntime(  854):        at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime(  854):        at java.lang.reflect.Method.invoke(Method.java:511)
E/AndroidRuntime(  854):        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
E/AndroidRuntime(  854):        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
E/AndroidRuntime(  854):        at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime(  854): Caused by: java.lang.UnsatisfiedLinkError: Couldn't load libbt_serialport: findLibrary returned null
E/AndroidRuntime(  854):        at java.lang.Runtime.loadLibrary(Runtime.java:365)
E/AndroidRuntime(  854):        at java.lang.System.loadLibrary(System.java:535)
E/AndroidRuntime(  854):        at com.youzhuan.bluetooth.SerialPort.<clinit>(SerialPort.java:96)
E/AndroidRuntime(  854):        ... 16 more

W/ActivityManager(  167):   Force finishing activity com.youzhuan.bluetooth/.Main

 原来libbt_serialport.so是要用System.loadLibrary("bt_serialport") 才行!