Android Question Cross-platform grid code: B4A is not equal B4J

Erel

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• Apr 28, 2024

• #2

1. Better to apply the grid after the boundaries are set:

B4X:

mRoot.Left = ApplyGrid(Max(0, Min(mRoot.Parent.Width - mRoot.Width, mRoot.Left + X - DownX)))
mRoot.Top = ApplyGrid(Max(0, Min(mRoot.Parent.Height - mRoot.Height, mRoot.Top + Y - DownY)))

2. The issue is probably related to the AutoScaleAll in the layout. It will cause the views size to slightly change. Remove it.

 

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peacemaker

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• Apr 28, 2024

• #3

Thanks, Erel.
But AutoScaleAll does not fully help.

 

Last edited: Apr 28, 2024

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klaus

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• Apr 28, 2024

• #4

Works as expected on my Samsung Galaxy S1 and my Samsung Galay tablet Tab S6.

 

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peacemaker

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• Apr 28, 2024

• #5

klaus said:

Works as expected on my Samsung

Click to expand...

Tks for test, Klaus. But check on PC - it's ideally fit at any position - if to fit the circles. But not under Android. I also use Samsung.

 

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Last edited: Apr 28, 2024

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klaus

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• Apr 28, 2024

• #6

With B4J I get also this !?
It is the same as in B4A.

 

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peacemaker

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• Apr 28, 2024

• #7

B4X:

Private GridSize As Int = 5dip

B4J log is 5 each step of the grid.
But B4A is logging as 7.

 

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peacemaker

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• Apr 28, 2024

• #8

Ha !

B4X:

Private GridSize As Int = 5  'solved, if without dip

 

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klaus

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• Apr 28, 2024

• #9

I used the project from post #5 as it is and I logged the GridSize, it is 15 on my smartphone with a scale of 3.
AutoScaleAll commented or not has no influence.
To me, removing dip sounds very strange, because this would mean a different behavior on devices with same physical dimensions but different pixel scales.

 

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peacemaker

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• Apr 28, 2024

• #10

If GridSize As Int = 5 without dip, but all other classes variables are with dip and the grid works OK on 2 phones + emulator:

If all without dip:

 

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klaus

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• Apr 28, 2024

• #11

For me, it does not fit on the circles either in B4J nor B4A.
But anyway, it is your project. If it fits your requirements its OK.

 

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peacemaker

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• Apr 28, 2024

• #12

Yes, maybe not ideal within the screen, but the topic is about the cross-platformity. I'm just try to make to be the fully same at 2 platforms.

 

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klaus

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• Apr 28, 2024

• #13

peacemaker said:

I'm just try to make to be the fully same at 2 platforms.

Click to expand...

To me, this means dip values for B4A.
A same physical point, in B4A, will be displayed almost the same physical size on any Android device.
Without dip values a point could be one half or one third of the size of a point in B4J.
Dip values have no effect in B4J.
But, again, this is just my opinion.
But, I do not understand why it works on my devices and not on yours. Are we really using exactly the same project ?

 

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peacemaker

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• Apr 28, 2024

• #14

It works, but the grid step and the scale are different comparing to the B4J. Is it OK ?
I guessed, if the code is the same at both systems, so the scale should be same, isn't it ?
But scales of each object are different on PC and Android.


Step of 5dip is logged as 5 and 7 at PC and Android.

 

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peacemaker

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• Apr 28, 2024

• #15

Hmm, wait, if 5dip grid and the layout without "AutoScaleAll" - seems, is got OK...

 

Last edited: Apr 28, 2024

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klaus

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• Apr 28, 2024

• #16

What is the scale of your Android device ?
If its 1, of course it works as you expect it.

 

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peacemaker

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• Apr 28, 2024

• #17

klaus said:

scale of your Android device

Click to expand...

GetDeviceLayoutValues.Scale = 2.8125

 

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klaus

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• Apr 28, 2024

• #18

peacemaker said:

GetDeviceLayoutValues.Scale = 2.8125

Click to expand...

What device do you have ?
Mine is 3
What do you get with:

B4X:

    Log("GridSize = " & GridSize)
    Log(GetDeviceLayoutValues.Scale)
    Log(xui.Scale)

I get:
GridSize = 15
3
3

Which is coherent.
AutoScaleAll has no effect, commented or uncommented.

 

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peacemaker

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• Apr 28, 2024

• #19

klaus said:

Log("GridSize = " & GridSize) Log(GetDeviceLayoutValues.Scale) Log(xui.Scale)

Click to expand...

*** Service (starter) Create ***
** Service (starter) Start **
** Activity (main) Create (first time) **
*** mainpage: B4XPage_Created
GridSize = 14
2.8125
2.8125

Click to expand...

 

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klaus

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• Apr 28, 2024

• #20

Again, what is your device ?

 

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