B4A Library Reflection library

campy74

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I don't download this library

:sign0085:

Hi, I've purchase basic4android product yesterday but I don't have permission for download it... can you help me?

Thanks in advance



 

corwin42

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Added RunPublicMethod.
This is a slightly more efficient i.e. slightly faster executing version of RunMethod4 but can only be used on Public methods.

Are you sure that this is implemented correct? It shows a signature of
RunPublicMethod(Method as String, Args() as Object, Types() as Class) as Object

If I try to pass the types as Stringarray I get a B4A compile error. If I try to pass the types as objectarray I get a ClassCastException at runtime.
 

agraham

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The signature is correct for that method but it's not easily callable from Basic4android. I think it arose because I did a cut and paste of the internal private method that all the RunMethods end up calling and overlooked changing the "types" parameter type.
 

qsrtech

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Reflection use help, set class property value dynamically

Hi, I'm trying to use this library to set my custom classes properties dynamically. I grab the classes property names and values from a remote server. I currently use RTTI in Delphi to do this.


I could use a Select Case for every property but this becomes difficult to maintain everytime a new property is added to the class. I want something clean and simple like this:

'this is just concept code, not actual
Dim MyItem as MyClass
myItem.initialize()

Dim r as reflection
r.target=myitem

'loop through retrieved values
for a=1 to recordcount
sql=record(a-1)
aproperty=sql.field(0)
avalue=sql.field(1)
r.SetPublicField2(AProperty,AValue) 'doesn't seem to work
'vs
Select aproperty
Case "prop1"
myitem.prop1=avalue
Case "prop2"
myitem.prop2=avalue
Case "propx"
myitem.propx=avalue
End Select
next

I reviewed several examples but can't seem to figure out how to accomplish my goal. Can someone please kindly help me out?

Thanks!

John
 

Dominex

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Hi agraham,

I need to intercept within a class, pressing the menu, I tried the code below, but it does not work. Is there a way to do that?
B4X:
'Class module
Sub Class_Globals
   Private vActivity As Activity
End Sub

'Initializes the object. You can add parameters to this method if needed.
Public Sub Initialize (Target As Activity)
   vActivity = Target
   Dim r As Reflector
   r.Target = vActivity
   r.SetOnKeyListener("Activity_KeyPress")
End Sub

Private Sub Activity_KeyPress (ViewTag As Object, KeyCode As Int,KeyEvent As Object) As Boolean
   If KeyCode = KeyCodes.KEYCODE_MENU Then
      ToastMessageShow("OK",False)
      Return True
   End If
End Sub
 

agraham

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Look in the logs. I guess you may have an "activity_keypress raiseEvent returned null" message. Erel will have to answer this as I am not familiar with how (or if) Basic4android Class methods are entered into the lookup table used to identify methods called as events.
 

dclarkchem

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Can't seem to get the library registered

Sorry, didn't see your response, but thanks for taking the time.

You can see from the first gif, that I have the Reflection.jar and the Reflection.xml in the additional subdirectory of B4A:

http://decsoftware.com/reflect.gif

but within B4A, I can't use the Reflection library. You can see that despite 'refreshing', restarting B4A and even restarting the computer, I can't use the library:

http://decsoftware.com/reflect2.gif

OK, I put them in a file folder called additional, and I get the same results.


I'm probably missing something simple.


Thanks!
 
Last edited:

dclarkchem

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THANK YOU! I never saw that before (and I had successfully installed the ByteConverter several weeks ago in another subdirectory).
 

burutxaga

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Error when compiling with the Reflection library

Hello,
I've just installed the Reflection Library and loaded the ReflectionDemo program in the IDE.
When I try to compile I get this error:

Compiling code. 0.04
Compiling layouts code. 0.01
Generating R file. 1.01
Compiling generated Java code. 1.36
Convert byte code - optimized dex. Error
UNEXPECTED TOP-LEVEL EXCEPTION:
java.lang.NullPointerException
at com.android.dx.cf.direct.ClassPathOpener.processDirectory(ClassPathOpener.java:179)
at com.android.dx.cf.direct.ClassPathOpener.processOne(ClassPathOpener.java:123)
at com.android.dx.cf.direct.ClassPathOpener.process(ClassPathOpener.java:109)
at com.android.dx.command.dexer.Main.processOne(Main.java:418)
at com.android.dx.command.dexer.Main.processAllFiles(Main.java:329)
at com.android.dx.command.dexer.Main.run(Main.java:206)
at com.android.dx.command.dexer.Main.main(Main.java:174)
at com.android.dx.command.Main.main(Main.java:95)
1 error; aborting
Standard dexer.

Can anyone help me? :BangHead:
 

burutxaga

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Error

Hello, and thanks for your anwswer.

I have the project at the same directory where I have ther other projects (at c:\users\Txus\Android\b4a programas\), with no problem at all with the other projects.

Anywhere, I copied the proyect to C:\reflection, loaded it and compiled it again, and the result was the same.

Thanks
 
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