java ndk的问题

[傻煎包]

我在调用byte[] szBmp = invswlt.Wlt2Bmp(invsIdCard.wlt);的时候 会报错
E/art: No implementation found for byte[] com.invs.invswlt.Wlt2Bmp(byte[]) (tried Java_com_invs_invswlt_Wlt2Bmp and Java_com_invs_invswlt_Wlt2Bmp___3B)
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
Process: net.xmut.ndkdemo, PID: 29581
java.lang.UnsatisfiedLinkError: No implementation found for byte[] com.invs.invswlt.Wlt2Bmp(byte[]) (tried Java_com_invs_invswlt_Wlt2Bmp and Java_com_invs_invswlt_Wlt2Bmp___3B)
at com.invs.invswlt.Wlt2Bmp(Native Method)
at invs.lanya.displayView(lanya.java:135)
at invs.lanya$2.onReceive(lanya.java:515)
at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:914)
at android.os.Handler.handleCallback(Handler.java:815)
at android.os.Handler.dispatchMessage(Handler.java:104)
at android.os.Looper.loop(Looper.java:194)
at android.app.ActivityThread.main(ActivityThread.java:5682)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:963)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:758)

这个应该怎么解决