Android DPI fun

Hi all

Been beating my head against a wall all day today but finally worked out how to handle getting the DPI of any android device.... To help anyone else who may suffer in the same way, here's how..

Identify a static control on your window (IMG_Menu in my case)

Since in the WM editor everything is always based on 160DPI you can use the CoordinateScreenToEditor command to work out what the DPI is.

all variables have 2 decimal places..
nX = CoordinateScreenToEditor(IMG_Menu..X)
gnDPIRatio = Round(IMG_Menu..X / nX,2)

MyDPI = 160 * gnDPIRatio

Boom!

Hi

it's certainly interesting, but it begs the question: why?

Best regards

Bosher,

I once found this piece of code. I use it to display the "density" of the screen in some kind of system-info screen in my apps.
I think this is your gnDPIratio .

Just create a global procedure as follows

import android.app.Activity; 
import android.content.Context; 
import android.view.View; 
import android.view.Window; 
import android.view.WindowManager;
import android.util.DisplayMetrics;

public static double getDisplayDensity()
{
	// [developer.android.com] 
	DisplayMetrics metrics = new DisplayMetrics();
	getActiviteEnCours().getWindowManager().getDefaultDisplay().getMetrics(metrics);
	
	return metrics.density;	
}

Fabrice,

It's because I needed to change the fontsize in a listbox according to device resolution. Anchoring resizes the control fine, However, I compute the optimal fontsize using the textwidth trick just fine. The issue is that with a listbox you need to also change the lineheight property to get it to display correctly.

I've built an algorithm that does this quite well now.

The reason i'm using a listbox is because I need to alternate the colours of each line based on content.

It's a long story I know... :0

Cheers

Bob

Thanks Arie.

That looks useful!

Cheers

Bob