java.lang.UnsatisfiedLinkError: Couldn't load eposprint: findLibrary returned null

Issue

I am using Android Studio. I am using e-POS-Print.jar in my app. Whenever I run the code I get this error:

java.lang.ExceptionInInitializerError
        at com.stc.printer.MyActivity.onCreate(MyActivity.java:48)
        at android.app.Activity.performCreate(Activity.java:5163)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2061)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2122)
        at android.app.ActivityThread.access$600(ActivityThread.java:140)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1228)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:137)
        at android.app.ActivityThread.main(ActivityThread.java:4895)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:511)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:994)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:761)
        at dalvik.system.NativeStart.main(Native Method)
 Caused by: java.lang.UnsatisfiedLinkError: Couldn't load eposprint: findLibrary returned null
        at java.lang.Runtime.loadLibrary(Runtime.java:365)
        at java.lang.System.loadLibrary(System.java:535)
        at com.epson.eposprint.Print.<clinit>(Print.java:18)
        at com.stc.printer.MyActivity.onCreate(MyActivity.java:48)

My code:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_my);

    System.out.println("started");

    printerName = getString(R.string.printername_t81ii);
    language = Builder.MODEL_SOUTHASIA;

    //bellow is line no. 48
    Print newPrinter = new Print(getApplicationContext());
    try{
        newPrinter.openPrinter(deviceType, openDeviceName, enabled, interval);

    }catch(Exception e){
        System.out.println("Error");
        e.printStackTrace();
        newPrinter = null;
    }

    setPrinter(newPrinter);
}

The sample project from Epson is having one native file with .so extension. But even if I remove that file from sample project it works.

I also tried adding that file to my project. But I am not able to add that file to my build path.

I also referred multiple answers from this link but I am unsuccessful.

Solution

After checking many sites, reading multiple answers, finally I figured out the solution.

Create folder tree as:

|---src
     |---main
           |---jniLibs
                  |---armeabi
                         |---nativeLib.so

Place your files under armeabi folder. And it will work.

More about java.lang.unsatisfiedlinkerror

Answered By - Paritosh