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You're required to select a category for your application. On December 22, 2010, the available category types changed in the Developer Console. The original categories were renamed, merged, or split into new categories. We believe this will enhance the user experience significantly; the new categories will rolling out to users over the course of a week.

Some of the highlights from the report include: Smartphones accounted for 48% of AdMob’s worldwide traffic, up from 35% in February 2009, fueled by heavy application usage on iPhone and Android devices. Although the share of feature phone traffic in AdMob’s network declined from 58% to 35%, the absolute traffic from feature phones still grew 31%.  This means that while the overall traffic from feature phones is growing, traffic from smartphones and mobile Internet devices is growing faster. The mobile Internet device category experienced the strongest growth of the three, increasing to account for 17% of traffic in AdMob’s network in February 2010.  Although the vast majority of traffic in this category comes from the iPod touch, the category also includes devices like the Sony PSP and Nintendo DSi.

Additionally, you can feel free to use the Search bar selection mechanism as a replacement for tabs since it’s really just a fast pivot on a data set. If you have more than 3 data sets, tabs become problematic since no more than 3 can be onscreen at once. For example, look at how we implemented the Profile switching mechanism below:

The good news for developers is you get this highly functional contacts feature for free if users choose to sync contact information into your app

The good news for developers is you get this highly functional contacts feature for free if users choose to sync contact information into your app. QuickContact for Android provides instant access to a contact's information and communication modes.

它已经上市一个月了，但 Android 3.0 的生态环境却没有显示出应有的活力，至今只有约 50 款专用软件上架

移动开发者 Justin Williams 在接受《连线》采访时说：“当年苹果的做法很明智，在 iPad 推出之前几个月就放出了开发工具。相比之下，Google 的开发者只是在 XOOM 发售之前几天才拿到开发工具。”所以在 iPad 发售时，商店里已经有了 1000 个专用软件。当 XOOM 发售时，这个数字是 15 。

还有另外一个原因导致开发者的热情不足，就是 Google 只把系统代码开放给了几个大厂商，例如摩托罗拉，三星，HTC 。大多数设备制造商和开发者根本接触不到 Android 3.0 的代码和技术细节，所以拖累了软件的开发进度