androidandroid-ndkserial-portgradle-experimental

NDK UnsatisfiedLinkError when lowering project api level 21 to 19

I made project using ndk with api level 21. But some reasons, I downgraded project api level 21 to 19.

My project worked fine in api 21, But after downgrading my project gives error in NDK part.

This is my error code when my project runs System.loadLibrary("serial_port");.

AndroidRuntime: java.lang.UnsatisfiedLinkError: dlopen failed: cannot locate symbol "tcgetattr" referenced by "libserial_port.so"...
AndroidRuntime:     at java.lang.Runtime.loadLibrary(Runtime.java:364)
AndroidRuntime:     at java.lang.System.loadLibrary(System.java:526)
AndroidRuntime:     at com.josh.mainSelection.UartUI.onCreate(UartUI.java:220)
AndroidRuntime:     at android.app.Activity.performCreate(Activity.java:5231)
AndroidRuntime:     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
AndroidRuntime:     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2148)
AndroidRuntime:     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233)
AndroidRuntime:     at android.app.ActivityThread.access$800(ActivityThread.java:135)
AndroidRuntime:     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
AndroidRuntime:     at android.os.Handler.dispatchMessage(Handler.java:102)
AndroidRuntime:     at android.os.Looper.loop(Looper.java:136)
AndroidRuntime:     at android.app.ActivityThread.main(ActivityThread.java:5001)
AndroidRuntime:     at java.lang.reflect.Method.invokeNative(Native Method)
AndroidRuntime:     at java.lang.reflect.Method.invoke(Method.java:515)
AndroidRuntime:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:811)
AndroidRuntime:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:627)
AndroidRuntime:     at dalvik.system.NativeStart.main(Native Method)

I'm first using NDK, and I'm not able to figure the problem. please help me solving error.

I'm using gradle-experimental:0.4.0.

Solution

  • I don't know why it works. But after deleting all .so files in my project and rebuilding, It works without any errors. I think .so files made in api level-21 made a crash someway.