I have a composable in which I have to calculate the height kotlinlang #compose-android

I have a composable in which I have to calculate the height and width that is available for that composable..I am setting its size from caller. It has a modifier params to which I am calling as modifier.fillMaxWidth().fillMaxHeight(.5f) I need the height to calculate the bars of my music player.

Tried Approach - Use the hoisted height variable and Calculate the size on GloballyChanged and set the value to hoisted height variable . The problem is that I have a canvas and I need to draw bars in the canvas depeending on the height that is available to the composable

Bars doesn;t seem to draw and it appears blank

Kirill Grouchnikov

10/03/2023, 11:19 AM

Canvas draw block gets

size

from which you can get current width and height

Mahmoo

10/03/2023, 2:34 PM

You will be surprised to know that the height of the canvas is coming out be 3x the height of the BoxWithContainer that contains it... Any Idea why?

image.png

Kirill Grouchnikov

10/03/2023, 2:36 PM

No code - no way to know where the problem is

It’s not exactly 3x, but it may be a very specific density of the device - since you’re having one height in

dp

units and another (canvas) in pixels

Mahmoo

10/03/2023, 2:37 PM

https://pastebin.com/gAtJwNcL Have a look!

Yeah you are right

Kirill Grouchnikov

10/03/2023, 2:40 PM

What exactly are you asking to look at? Canvas reports its size in pixels, and up top you report the height of the screen in

dp

units

Mahmoo

10/03/2023, 2:41 PM

Understood about canvas. When I called

Copy code

val canvasHeight = size.height.toDp().value

The height of canvas is coming out to be proper for the calculations that I need... Thanks🙌

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