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Android Design Guidelines

Google provides comprehensive Android Design Guidelines here:
http://developer.android.com/design/index.html

Take an hour or two to read through the entire documentation.
This document is meant to highlight the essentials.

One of the greatest challenges of designing for Android is supporting all of the different device sizes and screen densities. Because of this, Redlines should be expressed in dp(Density-pixels) instead of pixels. Read the "Must reads" below for more info on this.

Must reads:
Iconography
Metrics & Grids
Device Fragmentation

Asset Sizing Guide:
Asset Sizing Guide ** tvdpi should be scaled at 1.33x and is ~213DPI

File naming conventions

Ideally, any revisions of assets are delivered as a complete package in a .zip folder called "res.zip". In order to support all screen densities, we need to provide 6 different sizes of each asset. For example, say we have an asset called "my_launcher.png". Android requires that we place the assets in a specific folder structure as follows:

res/
  drawable-mdpi/my_launcher.png
  drawable-tvdpi/my_launcher.png
  drawable-hdpi/my_launcher.png
  drawable-xhdpi/my_launcher.png
  drawable-xxhdpi/my_launcher.png
  drawable-xxxhdpi/my_launcher.png

Other file naming rules:

  • No spaces allowed in file names
  • No capital letters allowed
  • No special characters other than underscores allowed
  • File names may not begin with numbers

Example suggested file names (view_specificasset_state):
videoplayer_playbtn_normal.png
videoplayer_playbtn_pressed.png
videoplayer_playbtn_focused.png
videoplayer_playbtn_disabled.png
videoplayer_playbtn_disabled_focused.png

Other Considerations