Android Question Stuck On Error "An Activity context is Required"

[mcqueccu]

Dear Frens,
I m currently trying to rewrite a custom-view in B4A which contains Grid with pan,zoom(using Gesture Detector lib) for calculating area of geometric figures, structure cut fill etc.
Here i am stuck with an error :
An Activity Context is Required.This call has a process context. Adding a global "Activity object" variable will fix this issue.
I have found a fix from this link :http://www.b4x.com/android/forum/th...s-when-no-activity-context-is-required.19300/
but still i could'nt solve my issue.
I have attached my project here with.
Where :
I have a Model Class Which is used to manage added node in Grid.
Node class for Adding nodes.
But i found an error in Node class for Draw sub method where id1 is a local variable for Node class but it requires the Activity context why?
if i Create a dummy view in Node Class then the error will be solved but it will popup error in my model class in AddNode method, where currnode is local to Model class.

M i doing something wrong?
Please help me if possible.
Best Regards...

 

[Erel]

I haven't checked your code. You can solve the "Activity context is required" error by adding a global UI variable. You don't need to do anything with it:

Private DummyButton As Button 'ignore

 

[mcqueccu]

I haven't checked your code. You can solve the "Activity context is required" error by adding a global UI variable. You don't need to do anything with it:

Private DummyButton As Button 'ignore

Dear Erel,
I have studied about this error in forum and got general idea about fixing it.But my current problem is i need to instantiate a Model Class and Node Class, Where the Activity Context Required error poped up.

As defining the Global Variable

Private DummyButton AsButton'ignore

1. Error in Node class is solved but cannot instantiate object in Model Class because now it is an activity Object.
2. If i define Dummybutton as global is Model class it will solve the problem in Model Class but Model class couldn't be instantiate from Main activity.

i m struggling for getting solution of this problem.It would be very grateful if u check my code once.
Thanks for ur support.
Best Regards,

 

[Erel]

If i define Dummybutton as global is Model class it will solve the problem in Model Class but Model class couldn't be instantiate from Main activity.

It can, but in Globals instead of Process_Globals.
Otherwise it will cause a memory leak.

 

[mcqueccu]

It can, but in Globals instead of Process_Globals.
Otherwise it will cause a memory leak.

Thank Erel I i have defined:
1.

Sub Globals
    'These global variables will be redeclared each time the activity is created.
    'These variables can only be accessed from this module.
    Public objModel As Model
    Private DrawableView1 As DrawableView
End Sub

in main activity.
2. I have Defined Dummy buttons on my Class Model & Node. It solved my Activity context Error.

But
2. Drawableview is a customview which is a Activity object itself how could i access objModel of Main Activity from Drawableview as it is defined as Global variable in Main.
I thought of Defining objmodel in starter services but it also didn't help.

please suggest.

 

[Erel]

You cannot. UI elements are tied to a specific Activity context. You cannot share them.

 

[mcqueccu]

You cannot. UI elements are tied to a specific Activity context. You cannot share them.

Thank u Erel for ur Great Support.
I will think another way to Pass variable(Byval) on DrawableView (Customview) so that i can use the public objModel inside customview.
IS there any method to do such type of task?

 

[Erel]

It sounds to me that you are building something that is more complex then needed.

You can use CallSub to call a sub in the activity that will return the global object.

 

[mcqueccu]

It sounds to me that you are building something that is more complex then needed.

You can use CallSub to call a sub in the activity that will return the global object.

Currently i solved it partially by making a Setter Getter in Drawable view and Assigning it from outside for Every update in Model instance.I will look forward about callsub now.
Thank you erel.
Here is what i m working on.
http://www.mediafire.com/file/uw3x6ququx5x4ot/ezgif.com-video-to-gif.gif