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I'm gonna release my app, it's a 1.2Mb apk that includes about 120 icons in 4 different formats (ldpi, mdpi, hdpi, x-hdpi).
If I add xx-dpi and xxx-hdpi icons the apk grows bigger and loading time increases.
There are many entry-level devices out there with really loooow memory and I'd like my app to run everywhere.
Do I really need to add xx-hdpi?
And is there a real device that requires xxx-hdpi?
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For example, if you have a bitmap drawable that's 48x48 pixels for medium-density screens, all the different sizes should be: 36x36 (0.75x) for low-density (ldpi) 48x48 (1.0x baseline) for medium-density (mdpi) 72x72 (1.5x) for high-density (hdpi)
xxhdpi device of 1080 x 1920 pixels (Samsung S4, S5) will be of 360 X 640 dp.
DPI (Dots per Inch) is a value that Android uses to determine the ideal size of images and app icons to show on the screen. This value can be changed to get a larger, zoomed-in display or smaller display as per your needs.
Base density for Android is mdpi. All other densities are its appropriate ratios, which is as follows: 0.75x — low-density (ldpi) 1.0x — medium-density (mdpi) 1.5x — high-density (hdpi)
You shouldn't really need xxxhdpi. It was only introduced because of the way that launcher icons are scaled on the nexus 5's launcher
Edit Back when I answered in Jan 2014, the Nexus 5 was the only device using xxxhdpi. Now many devices including the Nexus 6 and LG G3 use it. So it would be a good idea to include it in your app.
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We had to add xxxhdpi to our app for the Nexus 6, LG G3, and Samsung Galaxy Note 4. There will be more xxxdhpi devices in the future.
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