Difficulty to understand how to support multiple screen

Question

I have seen so many questions on StackOverFlow how to support multiple screens. But most of the answers provide this link and this. And in the first one link I have

Answer 1

In android-

px = dp * (dpi / 160)

1. So in your first question 960dp x 720dp at 320dpi means 1920px x 1440px for xlarge screen in landscape mode using above formula.

2. 640dp x 480dp at 240dpi means 960px x 720px for large screen in landscape mode.

To learn more about check this.