Android Question [SOLVED] AdditionalJar RunMethod Problem

Asoka · Nov 25, 2019

Im working on a kiosk app, and I must print on an USB connected printer (NP-F3692).
I want to use the manufacturer's lib Called "NPrinterLib.jar":

B4X:

#Region  Project Attributes
    #ApplicationLabel: Nii Print
    #VersionCode: 1
    #VersionName:
    'SupportedOrientations possible values: unspecified, landscape or portrait.
    #SupportedOrientations: unspecified
    #CanInstallToExternalStorage: False
    #BridgeLogger: True
#End Region

#Region  Activity Attributes
    #FullScreen: False
    #IncludeTitle: True
#End Region
#AdditionalJar: NPrinterLib
Sub Process_Globals
    'These global variables will be declared once when the application starts.
    'These variables can be accessed from all modules.
    'Dim Ni As NPrinterLib
    Dim NiOBJ As JavaObject
    Dim M As JavaObject
End Sub

But when I Call a function:

B4X:

Sub OpenPrinter
  
  
    Dim R As Object
  
      
  
    M = NiOBJ.Initializestatic("npi.sdk.NPrinterLib")                    'Initialized OK
    Log(NiOBJ.IsInitialized)
  
    R = M.RunMethod ("NOpenPrinter", Array("PrinterName", False))
  
    'Log (R)

  
End Sub

I see this error:

B4X:

Logger connected to:  HARDKERNEL Co., Ltd. ODROID-XU3
--------- beginning of /dev/log/main
*** Service (starter) Create ***
** Service (starter) Start **
** Activity (main) Create, isFirst = true **
** Activity (main) Resume **
true
main_openprinter (java line: 545)
java.lang.IllegalArgumentException: expected receiver of type npi.sdk.NPrinterLib, but got java.lang.Class<npi.sdk.NPrinterLib>
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at anywheresoftware.b4j.object.JavaObject.RunMethod(JavaObject.java:131)
    at asisoft.nii.print.main._openprinter(main.java:545)
    at asisoft.nii.print.main._cmdopen_click(main.java:390)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:196)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:180)
    at anywheresoftware.b4a.BA.raiseEvent(BA.java:176)
    at anywheresoftware.b4a.objects.ViewWrapper$1.onClick(ViewWrapper.java:80)
    at android.view.View.performClick(View.java:4438)
    at android.view.View$PerformClick.run(View.java:18422)
    at android.os.Handler.handleCallback(Handler.java:733)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:136)
    at android.app.ActivityThread.main(ActivityThread.java:5001)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
    at dalvik.system.NativeStart.main(Native Method)
--------- beginning of /dev/log/system

The function and function arguments seems good.
Can Help Me?

DonManfred · Nov 25, 2019

Where is the jar? Where is the Documentation?
Can you upload jar, documentation and example (android studio or similar)?

Asoka · Nov 25, 2019

DonManfred said:
Where is the jar? Where is the Documentation?
Can you upload jar, documentation and example (android studio or similar)?

Yes One moment pls ...
Thanx

Asoka · Nov 25, 2019

Sorry but file upload limited, so:

The Lib is:
https://www.dropbox.com/s/gawyw6qwzntao9b/NPrinterLib.jar?dl=0
The SDK dok is:
https://www.dropbox.com/s/l37wxryy3b3te9r/SDK Guide(Android).pdf?dl=0

Erel · Nov 25, 2019

Based on the error message, NOpenPrinter is not a static method which means that you cannot use InitializeStatic here.

Asoka · Nov 25, 2019

Erel said:
Based on the error message, NOpenPrinter is not a static method which means that you cannot use InitializeStatic here.

InitializeStatic instead InitializeNewInstance??

DonManfred · Nov 25, 2019

InitializeNewInstance instead of InitializeStatic, yes

Asoka · Nov 25, 2019

...or use as additional lib (but I haven't NPrinterLib.xml)
Can I generate xml file for this?

Asoka · Nov 25, 2019

InitializeNewInstance :

B4X:

M = NiOBJ.InitializeNewInstance("npi.sdk.NPrinterLib", Null)

And It says:

B4X:

Logger connected to:  HARDKERNEL Co., Ltd. ODROID-XU3
--------- beginning of /dev/log/main
*** Service (starter) Create ***
** Service (starter) Start **
** Activity (main) Create, isFirst = true **
** Activity (main) Resume **
main_openprinter (java line: 541)
java.lang.InstantiationException: can't instantiate class npi.sdk.NPrinterLib; no empty constructor
    at java.lang.Class.newInstanceImpl(Native Method)
    at java.lang.Class.newInstance(Class.java:1208)
    at anywheresoftware.b4j.object.JavaObject.InitializeNewInstance(JavaObject.java:85)
    at asisoft.nii.print.main._openprinter(main.java:541)
    at asisoft.nii.print.main._cmdopen_click(main.java:390)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:196)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:180)
    at anywheresoftware.b4a.BA.raiseEvent(BA.java:176)
    at anywheresoftware.b4a.objects.ViewWrapper$1.onClick(ViewWrapper.java:80)
    at android.view.View.performClick(View.java:4438)
    at android.view.View$PerformClick.run(View.java:18422)
    at android.os.Handler.handleCallback(Handler.java:733)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:136)
    at android.app.ActivityThread.main(ActivityThread.java:5001)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
    at dalvik.system.NativeStart.main(Native Method)
--------- beginning of /dev/log/system

OliverA · Nov 25, 2019

Asoka said:
java.lang.InstantiationException: can't instantiate class npi.sdk.NPrinterLib; no empty constructor

That's to be expected, since the docs you linked to in post #4 show (page 15) that the class constructor needs to be called with the applications context, but you are calling it with no parameters at all (empty constructor).
Try

B4X:

Dim context As JavaObject
context.InitializeContext
Dim M as JavaObject
M = NiOBJ.InitializeNewInstance("npi.sdk.NPrinterLib", Array As Object(context))

Asoka · Nov 25, 2019

OliverA said:
That's to be expected, since the docs you linked to in post #4 show (page 15) that the class constructor needs to be called with the applications context, but you are calling it with no parameters at all (empty constructor).
Try

B4X:

Dim context As JavaObject context.InitializeContext Dim M as JavaObject M = NiOBJ.InitializeNewInstance("npi.sdk.NPrinterLib", Array As Object(context))

Yeah, it works!
Thanks a Lot!

e.g.: how can I set this problem "[SOLVED]"

DonManfred · Nov 25, 2019

Asoka said:
e.g.: how can I set this problem "[SOLVED]"

See THREAD TOOLS at the upper right side. Choose Edit Title

Asoka · Nov 25, 2019

Ok I did It.

Android Question [SOLVED] AdditionalJar RunMethod Problem

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