No JNI_OnLoad found in

Members Great God
my SO file can be used in ANDROID 2.3 years , no No JNI_OnLoad found in the police.
But android 4.0 where there No JNI_OnLoad found in the police. But can also be used. You come across it ?
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wood has a relationship , can all be used , but it is recommended to implement this function
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I translated mokoid, at 4.0 compiler, reported this error. But I realize this function the way . Also has this error. . . .
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07-29 20:47:30.598: D / dalvikvm (5854): Trying to load lib / data / data / android_serialport_api.sample / lib / libserial_port.so 0x41348bf0
07-29 20:47:30.603: D / dalvikvm (5854): Added shared lib / data / data / android_serialport_api.sample / lib / libserial_port.so 0x41348bf0
07-29 20:47:30.608: D / dalvikvm (5854): No JNI_OnLoad found in / data / data / android_serialport_api.sample / lib / libserial_port.so 0x41348bf0, skipping init