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

From Android: Supporting Multiple Screens

px = dp * (dpi / 160)

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So for your example:

Your image dimensions are 960dp x 720dp and your dpi is 320 (which you can see falls under XHDPI).

Height = 960dp * (320 / 160) = 1920px

Width = 720dp * (320 / 160) = 1440px

Height and width are arbitrary depending on the orientation of the phone

Answer 2

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.

Answer 3

Refer this for Conversion of dp into px for each dpi (Android)

Answer 4

dp means density independent pixel. When you say for example 300dp means 300 pixels on a medium density (160dpi) screen. So if you want to translate dp on real resolution you have to multiply the dp for the density scale factor: es 300dp are

1. 300 px on a mdpi screen
2. 450 px on a hdpi screen
3. 600 px on a xhdpi screen

so if you specify resources you should remember to use both size and density modifiers a background for a 480x800 px medium screen phone woul be picked from normal-hdpi folder an so on