Android Question Error Context in Java inline Class module

[Lucas Siqueira]

Can anyone help me implement the java code that works in the Main module. I want to implement it in a class called Print.

But when I try to use it in the Print class, it gives an error in the JAVA code:
error: incompatible types: print cannot be converted to Context
printer = Printer.getInstance(this);

I've tried several ways to run the code in the class, and there's always an error.

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

#Region  Activity Attributes
    #FullScreen: False
    #IncludeTitle: False
    #BridgeLogger: True
#End Region

#AdditionalJar: positivo-printer-1.00.00.aar
#AdditionalJar: posmpapi_1.01.01.aar

Sub Process_Globals
    Private xui As XUI
    Private NativeMe As JavaObject
    Private Print1 As print
End Sub

Sub Globals
End Sub

Sub Activity_Create(FirstTime As Boolean)
    If FirstTime Then
        NativeMe.InitializeContext
    End If
    Print1.Initialize
End Sub

Sub Activity_Resume
End Sub

Sub Activity_Pause (UserClosed As Boolean)
End Sub

Private Sub Activity_Click
    'work
    imprimirTexto("Teste Activity")
    
    'not work
    Print1.imprimirTexto("Teste Class")
End Sub

Public Sub imprimirTexto(Texto1 As String)
    NativeMe.RunMethod("imprimirTexto", Array As String(Texto1))
End Sub

'Inline Java Code -> https://www.b4x.com/android/forum/threads/inline-java-code.50141
#IF JAVA
//biblioteca immpressora
import br.com.execucao.posmp_api.printer.Printer;
import br.com.execucao.posmp_api.printer.PrinterListener;

private Printer printer;

public void imprimirTexto(String texto1) {
    printer.print(texto1);
}

public void _onCreate() {   
     printer = Printer.getInstance(this);
     printer.open();     
     printer.setFeedLineAuto(true);
}

public void _onDestroy() {
    printer.close();
}
#End If

Private Sub Class_Globals
    Private NativeMe As JavaObject
End Sub

Public Sub Initialize
    NativeMe.InitializeContext
End Sub

Public Sub imprimirTexto(Texto1 As String)
    NativeMe.RunMethod("imprimirTexto", Array As String(Texto1))
End Sub

'Inline Java Code -> https://www.b4x.com/android/forum/threads/inline-java-code.50141
#IF JAVA
//biblioteca immpressora
import br.com.execucao.posmp_api.printer.Printer;
import br.com.execucao.posmp_api.printer.PrinterListener;

private Printer printer;

public void imprimirTexto(String texto1) {
    printer.print(texto1);
}

public void _onCreate() {   
     //printer = Printer.getInstance(this);
     printer.open();     
     printer.setFeedLineAuto(true);
}

public void _onDestroy() {
    printer.close();
}
#End If

B4A Versão: 12.50
Analisando o código.    (0.01s)
    Java Versão: 14
Building folders structure.    (0.02s)
Compilando o código    (0.03s)
Compilando código dos layouts.    (0.00s)
Organizando bibliotecas    (0.00s)
    (AndroidX SDK)
Compilando recursos    (0.08s)
Linkando recursos    (0.33s)
Compilando o código Java.    Error
src\b4a\example\print.java:68: error: incompatible types: print cannot be converted to Context
     printer = Printer.getInstance(this);
                                   ^
Note: src\b4a\example\main.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
1 error

javac 14.0.1

 

[Erel]

1. The "hooks" you added will only work in an activity.
2. You need to use JavaObject.InitializeContext to get the context object.
3. Using activities is a waste of time. Switch to B4XPages.
4. I recommend removing this java code and implementing it with JavaObject. It will be simpler.

 

[Lucas Siqueira]

1. The "hooks" you added will only work in an activity.
2. You need to use JavaObject.InitializeContext to get the context object.
3. Using activities is a waste of time. Switch to B4XPages.
4. I recommend removing this java code and implementing it with JavaObject. It will be simpler.

My project is old and quite large, I can't modify it for b4xpages at the moment. This code I published is just a piece to ask for help.

How could I implement JavaObject? Could you give me an example in my code?

 

[Erel]

With JavaObject:

Dim printer As JavaObject
Dim ctxt As JavaObject
ctxt.InitializeContext
printer.InitializeStatic("br.com.execucao.posmp_api.printer.Printer")
printer = printer.RunMethod("getInstance", Array(ctxt))
printer.RunMethod("open", Null)
...

 

[Lucas Siqueira]

working

Private Sub Class_Globals
End Sub

Public Sub Initialize
End Sub

Public Sub imprimirTexto(Texto1 As String)   
    Dim printer As JavaObject
    Dim ctxt As JavaObject
    ctxt.InitializeContext
    printer.InitializeStatic("br.com.execucao.posmp_api.printer.Printer")
    printer = printer.RunMethod("getInstance", Array(ctxt))
    printer.RunMethod("open", Null)
    printer.RunMethod("setFeedLineAuto", Array(True))
    printer.RunMethod("print", Array(Texto1))
End Sub