Android Responsive Design

I've been working on an android application on Titanium lately and i've come upon an issue.

What i'm struggling with is making a specific view responsive.

I want to show like 15-20 buttons on a view but i don't want it to be scrollable. Now if i use around 50dpi which is the recommended for buttons on some smaller screens i miss some of them.

How should i approach this? Should i use % of the device width and height which i get like

function PixelsToDPUnits(ThePixels) {
    if ( Titanium.Platform.displayCaps.dpi > 160 )
        return (ThePixels / (Titanium.Platform.displayCaps.dpi / 160));
    else 
        return ThePixels;
}
 
Ti.App.deviceWidth = PixelsToDPUnits(Ti.Platform.displayCaps.platformWidth);
Ti.App.deviceHeight = PixelsToDPUnits(Ti.Platform.displayCaps.platformHeight);

What's the most correct way to approach this.

THanks