Android Question storing panel objects in classes

[sorex]

Hello,

I'm trying out some class coding again and bumped into something I can't seem to solve and would like to have an explanation or solution on the behaviour.

I had it working by "posting" the panel name to the init & subs of the class.

But when trying to cut down the code a bit and using less sub calling variable I thought about sending the panel name in the init once and store it somewhere but I can't get it to work right.

the minified code looks like this...

Sub Class_Globals
Dim mainactivity As Activity
Dim menupanel As Panel
End Sub

Sub Initialize(act As Activity,menu_panel As Panel)
mainactivity=act
menupanel=menu_panel
End Sub

Sub start()
menupanel.Visible=False
end sub

I get errors that menupanel is not initialized.

If I init it the error is gone but the panel is still visible, so I guess it created a new one and hides that?

 

[DonManfred]

You should initialize the panel before you initialize your class so the object you give as parameter should be initialized at this moment...

 

[sorex]

thanks to TDS for the hint on Activity.LoadLayout() , it was placed under the class init's

 

[sorex]

Manfred: another issue...

I use a call to another class

Sub startGame()
Log("start game")
Dim game As GameClass
game.start()
End Sub

which gets executed to the point that I call the panel storage variable where I get a null pointer error while the panel storage variables are set in both classes during the init.

Sub start()
Log("game started")
menupanel.Visible=False   <- null pointer happends here
gamepanel.Visible=True
End Sub

 

[sorex]

ok, it seems that I start seeing how these classes are (supposed to) working with each other.

I had to add a

game.Initialize(mainactivity,menupanel,gamepanel)

right after the dim game, which makes sense (now) since you pass the values to a new class object.