iphone,Android各硬體圖片顯示解析度

The iOS platform has these characteristics:

• iPad: 1024x768px, 132 ppi
• iPhone/iPodTouch: 320x480px, 163 ppi
• iPhone 4: 960x640px, 326 ppi

For Android it is a little different, being an open platform, you may encounter many different screen resolutions:

• Nexus One: 480x800px, 254 ppi
• Droid: 854x480px, 265 ppi
• HTC Legend: 320x480px, 180 ppi

The ICON size

The icon size for the iPhone icons is 57x57px, but the iTunes store uses a 512x512px image, so it’s better to create your icon in this size and then scale down for the icon.

iphone桌面上的icon尺寸是57x57pixel,但是在iTunes store的頁面上是使用512x512px image, 
所以最好是開啟512x512px的大小來製作icon，然後再縮小一個給iphone使用

It doesn’t need to have the rounded corners or the transparent glare -iTunes and the iPhone will do that for you automatically.

不需要在四角做圓角或是在icon上作反光，iTunes跟iPhone會自動幫icon加上這些特效