Designing for Android - Resolution?

I'm designing an app for android, and the main devices we're targeting are Nexus S and Galaxy Tab, so I wonder which resolution should I design for and what PPI to use? I'd be using photoshop.

Surprisingly, I couldn开发者_如何学C't find a single decent PSD template for android while there are tons available for iOS, or maybe I'm just not looking at the right place?

Many thanks

The Nexus S and Galaxy Tab both have HDPI screens. The layout sizes are:

• Nexus S: Normal
• Galaxy Tab: Large

For HDPI graphics the nominal resolution is 240 DPI. The size of a graphic should be

pixels = dips * (density / 160)

which for HDPI devices becomes pixels = dips * 1.5, where dips is the size of the object in density independent pixels.

This means a 16x16 normal (MDPI) icon should be 24x24 pixels on an HDPI device to maintain the same size graphic.

The screen sizes are:

• Nexus S: 480x800
• Galaxy Tab: 1024x600

so just make your mockups this size.

You can see details for every mobile devices here (http://deviceatlas.com):

http://deviceatlas.com/devices/Samsung/Nexus+S/entry/2282190

deviceatlas.com/devices/Samsung/Galaxy+Tab/entry/1999308

deviceatlas.com/devices/Samsung/Galaxy+Tab+2/entry/2258482

deviceatlas.com/devices/Samsung/Galaxy+Tab+10.1/entry/2418093

You can use also Tera-WURFL script for detecting mobile device width by getting user agent from browser. See demo here: http://www.tera-wurfl.com/explore/