Android Question Java Inline Code in Class or Code Module?

ilan · Apr 3, 2016

hi

i want to use a java inline code from a class module or a code module
but how do i do this?

i put the javaobject in the codemodule and also the java inline code but when i try to run it i get an error
that the java code was not found.

when i run it from the main activity it is working

error: java.lang.RuntimeException: Method: not matched.

DonManfred · Apr 3, 2016

See the inline java tutorial. Especially the sample project. It shows how to use inline java in all module-types

ilan · Apr 3, 2016

do you have a link?

ilan · Apr 3, 2016

oh do you mean that one?

https://www.b4x.com/android/forum/threads/inline-java-code.50141/#content

i saw it but could not figure out how to do it

DonManfred · Apr 3, 2016

ilan said:
oh do you mean that one?

Yes.

Erel said:
See the attached project. It shows how to call Java methods in all types of modules

Check the Sample Project again. There is a Servicemodule, a Classmodule a Codemodule and an Activity module in use

ilan · Apr 3, 2016

i need to make it in a class or module

when i use it in main activity i intialize the java object with

B4X:

nativeMe.InitializeContext

and then i call the nativeMe.runmethod with ...(Array(nativeMe,GetPackageName))

but in class module i get an error Method not matched

ilan · Apr 3, 2016

in the example i see that erel doesnot intialize the javaobject in the class he only say nativeMe = Me

so i do the same but get an error

JordiCP · Apr 3, 2016

Dim a public (JavaObject)nativeMe un Main Process Globals, and try this

B4X:

nativeMe.RunMethod("yourInlineJavaMethod",Array(Main.nativeMe,GetPackageName))

Informatix · Apr 4, 2016

Code modules are made of static functions so you have to initialize the JavaObject with InitializeStatic not InitializeContext (there's no context; it's not an activity).

B4X:

Dim MyJavaCode As JavaObject
MyJavaCode.InitializeStatic(Application.PackageName & ".mycodemodulename")
MyJavaCode.RunMethod("MyMethod", Null)

#If JAVA
public static void MyMethod() {
...

In a class module, you can do the same.

ilan · Apr 4, 2016

Thank you @Informatix i will try it out.

I have not much experience with the java object but it seems like it is very powerful since you can use 100% java code in your app.

Informatix · Apr 4, 2016

ilan said:
Thank you @Informatix i will try it out.

I have not much experience with the java object but it seems like it is very powerful since you can use 100% java code in your app.

Yes, but knowing Java is a pre-requisite anyway. Pasting code from Internet won't work most of the time.

JordiCP · Apr 4, 2016

In Ilan's example, he needs to pass a context to the called Inline Java function. With initializeStatic you can call methods but not use the same JavaObject as a context to be passed as a parameter
I think (may be wrong) we need to pass the context of the activity which initted the class instance, assuming it was "main". (In fact, it would be better if one of the params used to init this class was the same activity's context)

ilan · Apr 4, 2016

JordiCP said:
In Ilan's example, he needs to pass a context to the called Inline Java function. With initializeStatic you can call methods but not use the same JavaObject as a context to be passed as a parameter
I think (may be wrong) we need to pass the context of the activity which initted the class instance, assuming it was "main". (In fact, it would be better if one of the params used to init this class was the same activity's context)

this was exactly my problem yesterday but i passed it by using a global java object from the main activity (like you have suggested)
would interest me to see if i can do it without the global java object.

JordiCP · Apr 4, 2016

try this and keep the global java object private

JordiCP said:
(In fact, it would be better if one of the params used to init this class was the same activity's context)

ilan · Apr 4, 2016

was the same activity's context

can you please explain jordiCP?

Informatix · Apr 4, 2016

JordiCP said:
In Ilan's example,

Where is it?

JordiCP said:
he needs to pass a context to the called Inline Java function.

If you need the context in a class module, it's a different story of course.
If you need the application context, you can get it directly in Java with BA.applicationContext. If you need the activity context, you have to pass it.

ilan · Apr 4, 2016

Informatix said:
Where is it?

B4X:

nativeMe.runmethod with ...(Array(nativeMe,GetPackageName))

ilan · Apr 4, 2016

what i want to do is to get the result (boolean or string) from the codemodule that uses Content peckagemenager

JordiCP · Apr 4, 2016

In main, or the activity where you instantiate your class

B4X:

  myClass.initialize(nativeMe)   'this is the global activityContext

and in your class

B4X:

Sub Class_Globals
    Private nativeMe As JavaObject
    Private CallerContext As JavaObject
End Sub

'Initializes the object. You can add parameters to this method if needed.
Public Sub Initialize( CallerActivityContext As JavaObject)
    nativeMe = Me
    CallerContext=CallerActivityContext
    Log(nativeMe.RunMethod("mymethod", Array (CallerContext,...)))
End Sub

if it is a code module, then do the same, passing the activity context as one of the arguments of that Sub in the code module

ilan · Apr 4, 2016

JordiCP said:
In main, or the activity where you instantiate your class

B4X:

myClass.initialize(nativeMe) 'this is the global activityContext

and in your class

B4X:

Sub Class_Globals Private nativeMe As JavaObject Private CallerContext As JavaObject End Sub 'Initializes the object. You can add parameters to this method if needed. Public Sub Initialize( CallerActivityContext As JavaObject) nativeMe = Me CallerContext=CallerActivityContext Log(nativeMe.RunMethod("mymethod", Array (CallerContext,...))) End Sub

if it is a code module, then do the same, passing the activity context as one of the arguments of that Sub in the code module

This is exactly what i do
But is it possible without the javaobject in main activity?

Android Question Java Inline Code in Class or Code Module?

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