Android Dev

It allows third-party application servers to send lightweight messages to their Android applications. The messaging service is not designed for sending a lot of user content via the messages. Rather, it should be used to tell the application that there is new data on the server, so that the application can fetch it. C2DM makes no guarantees about delivery or the order of messages. So, for example, while you might use this feature to tell an instant messaging application that the user has new messages, you probably would not use it to pass the actual messages. An application on an Android device doesn’t need to be running to receive messages. The system will wake up the application via Intent broadcast when the the message arrives, as long as the application is set up with the proper broadcast receiver and permissions.

It uses an existing connection for Google services. This requires users to set up their Google account on their mobile devices.

C2DM imposes the following limitations: The message size limit is 1024 bytes. Google limits the number of messages a sender sends in aggregate, and the number of messages a sender sends to a specific device

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.

Most Android Smartphones released this year will receive the Android 2.2 Froyo. If you have a 2009 HTC Magic, then you might receive the Android 2.2 Froyo as well. France’s 2nd largest largest mobile carrier SFR officially announced the Magic will be receiving the Froyo update.

T-Mobile USA said the myTouch 3G, basically the same thing as a HTC Magic would be updated with Froyo a bit later this year. So it looks like the old Magic will be receiving the new Google OS in the next few months.

手势相对于无趣的触摸和点击来说，给用户带来了的动态感。但是，缺乏一致性，操作的不易发觉，加上极易触发的不可恢复的操作，使得整个系统的可用性遭到损害。  我们迫切的需要回到基本原则，为这些系统开发可用性指南，这份指南应该基于交互设计的坚实原则，而不是某个公司在人机交互指导中的奇思，或者一些开发者的妙想

简单的宣称你的用户界面“有趣”和“自然”并不能证明你的界面可用，当你的用户使用软件时，对于如何操作茫然无措，并不是什么好玩的事情

1.Android 许多重要的功能是不可见的，除非你长按界面上的某东西，我经常对此感到懊恼

你可以在 EyE-Sight 站点了解到更多关于这一功能的消息，也可以通过下面的视频来了解更多细节。 继续观看视频：

市场调研公司尼尔森最近发布了 ”App Playbook“，他们调查了 4200 名在过去 1 个月中下载应用的人

2009 年第四季度，21% 美国无线用户拥有智能手机，这一数字高于上一季度的 19%，大幅高于 2008 年底的 14%。 14% 的移动用户在 30 天内下载过一个应用。 应用程序平均数量：智能手机：22，功能手机：10 BlackBerry: 10 iPhone:37 Android: 22 Palm: 14 Windows Mobile: 13

Facebook, Google Maps and Weather Channel 是跨平台间最受欢迎的应用 iPhones: Facebook (58%), iTunes (48%), Google Maps (47%) Android: Google Maps (67%), Facebook (50%), Weather Channel (38%) Blackberry: Facebook (51%), Google Maps(34%), Weather Channel (28%)